Jeep Wrangler TJ 2006 User manual

TABLE OF CONTENTS
1.0 INTRODUCTION .........................................................1
1.1 SYSTEM COVERAGE ...............................................1
1.2 SIX-STEP TROUBLESHOOTING PROCEDURE ..........................1
2.0 IDENTIFICATION OF SYSTEM .............................................1
3.0 SYSTEM DESCRIPTION AND FUNCTIONAL OPERATION ......................1
3.1 AIRBAG SYSTEM ...................................................1
3.1.1 PASSENGER AIRBAG ON-OFF SWITCH........................2
3.1.2 SPECIAL TOOLS............................................3
3.1.3 DIAGNOSTIC TROUBLE CODES ..............................3
3.1.3.1 ACTIVE CODES ............................................3
3.1.3.2 STORED CODES ...........................................3
3.2 AUDIO SYSTEM ....................................................4
3.2.1 SATELLITE RADIO (SDARS) ..................................4
3.3 ELECTROCHROMIC COMPASS/TEMPERATURE MIRROR WITH LIGHTS ....4
3.4 ELECTRICALLY HEATED SYSTEMS ...................................7
3.4.1 REAR WINDOW DEFOGGER .................................7
3.5 ELECTRO/MECHANICAL INSTRUMENT CLUSTER (EMIC).................7
3.5.1 SMART CLUSTER FEATURES ................................7
3.5.2 INSTRUMENT CLUSTER SELF TEST...........................8
3.6 VEHICLE COMMUNICATION..........................................8
3.7 USING THE DRBIIIT................................................10
3.7.1 DRBIIITERROR MESSAGES AND BLANK SCREEN .............10
3.7.2 DRBIIITDOES NOT POWER UP..............................10
3.7.3 DISPLAY IS NOT VISIBLE ...................................10
4.0 DISCLAIMERS, SAFETY, WARNING .......................................10
4.1 DISCLAIMERS.....................................................10
4.2 SAFETY..........................................................10
4.2.1 TECHNICIAN SAFETY INFORMATION.........................10
4.2.2 VEHICLE PREPARATION FOR TESTING.......................11
4.2.3 SERVICING SUB-ASSEMBLIES ..............................11
4.2.4 DRBIIITSAFETY INFORMATION..............................11
4.3 WARNINGS .......................................................11
4.3.1 VEHICLE DAMAGE WARNINGS ..............................11
4.3.2 ROAD TESTING A COMPLAINT VEHICLE ......................11
5.0 REQUIRED TOOLS AND EQUIPMENT .....................................12
6.0 GLOSSARY OF TERMS..................................................12
7.0 DIAGNOSTIC INFORMATION AND PROCEDURES ...........................13
AIRBAG
ACCELEROMETER 1....................................................14
INTERNAL 1 ...........................................................14
OUTPUT DRIVER 1 .....................................................14
SAFING SENSOR.......................................................14
STORED ENERGY FIRING 1..............................................14
STORED ENERGY LOGIC................................................14
i

TABLE OF CONTENTS - Continued
AIRBAG WARNING INDICATOR OPEN .....................................16
AIRBAG WARNING INDICATOR SHORT ....................................16
CLUSTER MESSAGE MISMATCH .........................................19
DRIVER SQUIB 1 CIRCUIT OPEN .........................................21
DRIVER SQUIB 1 CIRCUIT SHORT ........................................24
DRIVER SQUIB 1 SHORT TO BATTERY ....................................27
DRIVER SQUIB 1 SHORT TO GROUND ....................................30
LOSS OF IGNITION RUN - START .........................................33
LOSS OF IGNITION RUN ONLY ...........................................37
MODULE NOT CONFIGURED FOR PAB OFF SWITCH ........................40
NO CLUSTER MESSAGE ................................................43
NO PCI TRANSMISSION .................................................45
PASSENGER AIRBAG ON - OFF SWITCH OPEN.............................47
PASSENGER AIRBAG ON - OFF SWITCH SHORT TO BATTERY................50
PASSENGER AIRBAG ON - OFF SWITCH SHORT TO GROUND................53
PASSENGER OFF INDICATOR CIRCUIT SHORT TO BATTERY .................56
PASSENGER OFF INDICATOR CIRCUIT SHORT TO GROUND .................59
PASSENGER SQUIB 1 CIRCUIT OPEN .....................................63
PASSENGER SQUIB 1 CIRCUIT SHORT....................................66
PASSENGER SQUIB 1 SHORT TO BATTERY................................69
PASSENGER SQUIB 1 SHORT TO GROUND ................................72
*AIRBAG INDICATOR ON WITHOUT ACTIVE TROUBLE CODES................75
AUDIO
ALL OUTPUTS SHORT - BASE AUDIO SYSTEM .............................76
ALL OUTPUTS SHORT - PREMIUM AUDIO SYSTEM .........................78
CASSETTE PLAYER INOP ...............................................81
CD MECHANICAL FAILURE ..............................................81
NO PCI TRANSMISSION .................................................81
*AM/FM SWITCH INOPERATIVE...........................................81
*ANY STATION PRESET SWITCH INOPERATIVE.............................81
*BALANCE INOPERATIVE ................................................81
*CD EJECT SWITCH INOPERATIVE........................................81
*EQUALIZER INOPERATIVE ..............................................81
*FADER INOPERATIVE ..................................................81
*FF/RW SWITCH INOPERATIVE...........................................81
*HOUR/MINUTE SWITCHES INOPERATIVE .................................81
*PAUSE/PLAY SWITCH INOPERATIVE .....................................81
*PWR SWITCH INOPERATIVE ............................................81
*SCAN SWITCH INOPERATIVE............................................81
*SEEK SWITCH INOPERATIVE............................................81
*SET SWITCH INOPERATIVE .............................................81
*TAPE EJECT SWITCH INOPERATIVE......................................81
*TIME SWITCH INOPERATIVE ............................................81
*TUNE SWITCH INOPERATIVE............................................81
CD PLAY FAILURE ......................................................83
CD READ FAILURE .....................................................84
CD TEMPERATURE HIGH................................................85
LOW VOLTAGE LEVEL ..................................................86
NO ANTENNA CONNECTION .............................................87
POWER AMP SHUTDOWN - BASE AUDIO SYSTEM..........................88
POWER AMP SHUTDOWN - PREMIUM AUDIO SYSTEM ......................90
*POOR SDARS RECEPTION..............................................93
ii

TABLE OF CONTENTS - Continued
*POOR SOUND QUALITY ................................................94
*SDARS INOP NO CODES ...............................................95
CHIME
*CHIME INOPERATIVE AT ALL TIMES ......................................97
*CHIME INOPERATIVE WITH DRIVER SEAT BELT UNFASTENED...............98
*CHIME INOPERATIVE WITH EXTERIOR LAMPS ON AND DRIVER DOOR OPEN .99
*CHIME INOPERATIVE WITH KEY IN IGNITION, DRIVER’S DOOR OPEN .......100
*CHIME SOUNDS WITH DRIVER SEAT BELT FASTENED ....................103
*CHIME SOUNDS WITH DRIVER’S DOOR OPEN, KEY REMOVED.............105
COMMUNICATION
*NO RESPONSE FROM AIRBAG CONTROL MODULE .......................106
*NO RESPONSE FROM CONTROLLER ANTILOCK BRAKE ...................108
*NO RESPONSE FROM INSTRUMENT CLUSTER ...........................110
*NO RESPONSE FROM PCM (PCI BUS) - NGC .............................112
*NO RESPONSE FROM PCM (PCM SCI ONLY) - NGC .......................113
*NO RESPONSE FROM RADIO ..........................................116
*NO RESPONSE FROM SATELLITE RADIO RECEIVER ......................118
*NO RESPONSE FROM SENTRY KEY IMMOBILIZER MODULE ...............120
*NO RESPONSE FROM TRANSMISSION CONTROL MODULE - NGC ..........122
*PCI BUS COMMUNICATION FAILURE ....................................125
COMPASS/MINI-TRIP COMPUTER
*COMPASS/TEMP MODULE WILL NOT CALIBRATE .........................128
*COMPASS/TEMPERATURE MODULE INOPERATIVE........................129
*TEMPERATURE DISPLAY INACCURATE OR INOPERATIVE..................130
ELECTRICALLY HEATED SYSTEMS
*REAR WINDOW DEFOGGER INOPERATIVE...............................132
*REAR WINDOW DEFOGGER SWITCH INDICATOR LAMP INOPERATIVE.......135
INSTRUMENT CLUSTER
ACM MESSAGE NOT REC’D BY MIC......................................136
AIR BAG LAMP CIRCUIT OPEN ..........................................137
AIR BAG LAMP CIRCUIT SHORT.........................................138
CHECKSUM FAILURE ..................................................139
PANEL DIMMER OPEN .................................................140
PCM MESSAGE NOT REC’D BY MIC......................................142
SKIM MESSAGE NOT REC’D BY MIC .....................................143
*9NO BUS9IN VF DISPLAY ..............................................144
*9NO FUSE9IN VF DISPLAY .............................................145
*4WD INDICATOR INOPERATIVE.........................................146
*ABS INDICATOR INOPERATIVE .........................................149
*AIR BAG INDICATOR INOPERATIVE .....................................150
*ALL GAUGES INOPERATIVE............................................151
*ANY PCI BUS INDICATOR INOPERATIVE .................................153
*AXLE LOCK INDICATOR PROBLEMS.....................................154
*BRAKE WARNING INDICATOR ALWAYS ON ...............................157
*BRAKE WARNING INDICATOR INOPERATIVE .............................158
*FOG LAMP INDICATOR INOPERATIVE - DOMESTIC........................160
*HIGH BEAM INDICATOR INOPERATIVE...................................161
*ONE GAUGE INOPERATIVE ............................................162
iii

TABLE OF CONTENTS - Continued
*PANEL DIMMNG INOPERATIVE .........................................163
*REAR FOG LAMP INDICATOR INOPERATIVE - BUX ONLY...................164
*SEAT BELT INDICATOR NOT OPERATING PROPERLY......................165
*SPEEDOMETER INACCURATE OR INOPERATIVE..........................167
*VF DISPLAY INOPERATIVE .............................................168
*VF ODOMETER INOPERATIVE WITH DOOR OPEN.........................169
INTERIOR LIGHTING
*COURTESY LAMPS INOPERATIVE - ALL LAMPS...........................171
*COURTESY LAMPS ON AT ALL TIMES ...................................172
*ILLUMINATED ENTRY INOPERATIVE.....................................174
VERIFICATION TESTS
VERIFICATION TESTS..................................................175
8.0 COMPONENT LOCATIONS..............................................179
8.1 DATA LINK CONNECTOR ..........................................179
8.2 AIRBAG .........................................................179
8.2.1 DRIVER AIRBAG MODULE & CLOCKSPRING .................179
8.2.2 DRIVER/PASSENGER AIRBAG MODULES & MECHANICAL
INSTRUMENT CLUSTER...................................180
8.2.3 AIRBAG CONTROL MODULE AND PASSENGER AIRBAG ON/OFF
SWITCH.................................................180
8.3 FUSE BLOCK ....................................................181
8.4 INSTRUMENT CLUSTER...........................................181
8.4.1 FRONT VIEW ............................................181
8.4.2 REAR VIEW..............................................182
8.5 POWER DISTRIBUTION CENTER (PDC)..............................182
9.0 CONNECTOR PINOUTS ................................................183
AIRBAG CONTROL MODULE - YELLOW 22 WAY ...........................183
AXLE LOCK SWITCH (OFF-ROAD PACKAGE)-8WAY.......................183
CLOCKSPRING C2 - YELLOW 2 WAY .....................................183
COMPASS/TEMPERATURE MIRROR - BLACK 7 WAY........................184
CONTROLLER ANTILOCK BRAKE - 25 WAY ...............................184
DATA LINK CONNECTOR - BLACK 16 WAY ................................184
DRIVER AIRBAG SQUIB 1 - YELLOW 2 WAY ...............................185
FRONT LOCKER INDICATOR SWITCH (OFF-ROAD PACKAGE) - BLACK 2 WAY .185
FRONT LOCKER PUMP (OFF-ROAD PACKAGE) - LT. GRAY 3 WAY ............185
FUSES (FB)...........................................................187
IGNITION SWITCH - 10 WAY ............................................187
INSTRUMENT CLUSTER C1 - 12 WAY ....................................188
INSTRUMENT CLUSTER C2 - 16 WAY ....................................188
LEFT COURTESY LAMP - BLACK 2 WAY ..................................188
LEFT DOME LAMP - BLACK 2 WAY.......................................189
LEFT FRONT SPEAKER - BLACK 3 WAY ..................................189
LEFT REAR SPEAKER - BLACK 3 WAY ...................................189
MULTI-FUNCTION SWITCH C1 - GRAY 20 WAY.............................189
MULTI-FUNCTION SWITCH C2 - BLACK 7 WAY.............................190
PASSENGER AIRBAG ON-OFF SWITCH (LHD)-6WAY......................190
PASSENGER AIRBAG SQUIB 1 - YELLOW 2 WAY...........................190
FUSES (PDC) .........................................................192
iv

TABLE OF CONTENTS - Continued
FRONT LOCKER RELAY (OFF-ROAD PACKAGE) ...........................192
REAR LOCKER RELAY (OFF-ROAD PACKAGE).............................192
REAR WINDOW DEFOGGER RELAY......................................192
POWERTRAIN CONTROL MODULE C1 - BLACK/BLACK 38 WAY ..............193
RADIO C1 - GRAY 22 WAY ..............................................194
RADIO C2 (SATELLITE RADIO) - 10 WAY ..................................194
REAR LOCKER INDICATOR SWITCH (OFF-ROAD PACKAGE) - BLACK 2 WAY. . .194
REAR LOCKER PUMP (OFF-ROAD PACKAGE) - LT. GRAY 3 WAY .............195
REAR WINDOW DEFOGGER SWITCH (HARD TOP)-4WAY.................195
RECEIVER-SATELLITE C1 - 12 WAY ......................................195
RECEIVER-SATELLITE C2-2WAY.......................................195
RIGHT COURTESY LAMP - BLACK 2 WAY .................................196
RIGHT DOME LAMP - BLACK 2 WAY......................................196
RIGHT FRONT SPEAKER - BLACK 3 WAY .................................196
RIGHT REAR SPEAKER - BLACK 3 WAY ..................................196
SATELLITE ANTENNA - 2 WAY...........................................197
SENTRY KEY IMMOBILIZER MODULE - BLACK 6 WAY ......................197
TRANSFER CASE SWITCH (EXCEPT OFF-ROAD PACKAGE) - BLACK 2 WAY . . .197
TRANSFER CASE SWITCH (OFF-ROAD PACKAGE) - BLACK 2 WAY...........197
10.0 SCHEMATIC DIAGRAMS................................................199
10.1 AIRBAG SYSTEM.................................................199
10.2 AUDIO SYSTEM ..................................................200
10.2.1 BASE AUDIO SYSTEM.....................................200
10.2.2 PREMIUM AUDIO SYSTEM.................................201
10.2.3 SATELLITE RADIO SDAR ..................................202
10.3 CHIME SYSTEM..................................................203
10.4 COMPASS/TEMPERATURE MIRROR.................................203
10.5 INSTRUMENT CLUSTER...........................................204
10.5.1 INSTRUMENT CLUSTER/AXLE LOCKER SYSTEM .............205
10.6 INTERIOR LIGHTING ..............................................206
10.7 REAR DEFOGGER................................................207
10.8 VEHICLE COMMUNICATIONS.......................................208
v

NOTES
vi

1.0 INTRODUCTION
The procedures contained in this manual include
all the specifications, instructions, and graphics
needed to diagnose body system problems. The
diagnostics in this manual are based on the failure
condition or symptom being present at time of
diagnosis.
Please follow the recommendations below when
choosing your diagnostic path.
1. First make sure the DRBIIItis communicating
with the appropriate modules: i.e., if the
DRBIIItdisplays a 9No Response9condition, you
must diagnose that first.
2. Read DTC’s (diagnostic trouble codes) with the
DRBIIIt.
3. If no DTC’s are present, identify the customer
complaint.
4. Once the DTC or customer complaint is identi-
fied, locate the matching test in the Table of
Contents and begin to diagnose the symptom.
All component location views are in Section 8.0.
All connector pinouts are in Section 9.0. All sche-
matics are in Section 10.0.
An asterisk (*) placed before the symptom de-
scription indicates a customer complaint.
When repairs are required, refer to the appropri-
ate service manual for the proper removal and
repair procedure.
Diagnostic procedures change every year. New
diagnostic systems may be added: carryover sys-
tems may be enhanced. READ THIS MANUAL
BEFORE TRYING TO DIAGNOSE A VEHICLE
DIAGNOSTIC TROUBLE CODE. It is recom-
mended that you review the entire manual to be-
come familiar with all the new and changed diag-
nostic procedures.
This book reflects many suggested changes from
readers of past issues. After using this book, if you
have any comments or suggestion, please fill out the
form in the back of the book, and mail it back to us.
1.1 SYSTEM COVERAGE
This diagnostic procedures manual covers all
2006 JeeptWrangler (TJ) vehicles.
1.2 SIX-STEP TROUBLESHOOTING
PROCEDURE
Diagnosis of the body system is performed in six
basic steps:
1. verification of complaint
2. verification of any related symptoms
3. symptom analysis
4. problem isolation
5. repair of isolated problem
6. verification of proper operation
2.0 IDENTIFICATION OF
SYSTEM
The vehicle systems that are part of the 9body9
system are:
•airbag system
•audio
•chime
•electrically heated systems
•instrument cluster
•vehicle communications
3.0 SYSTEM DESCRIPTION AND
FUNCTIONAL OPERATION
The body system on the 2006 JeeptWrangler (TJ)
consists of a combination of modules that commu-
nicate over the PCI bus (Programmable Communi-
cation Interface multiplex system). Through the
PCI bus, information about the operation of vehicle
components and circuits is relayed quickly to the
appropriate module(s). All modules receive all the
information transmitted on the bus even though a
module may not require all information to perform
its function. It will only respond to messages 9ad-
dressed9to it through a binary coding process. This
method of data transmission significantly reduces
the complexity of the wiring in the vehicle and the
size of wiring harnesses. All of the information
about the functioning of all the systems is orga-
nized, controlled, and communicated by the PCI
bus, which is described in the Vehicle Communica-
tion Section of the general information.
3.1 AIRBAG SYSTEM
The Airbag system is designed to provide in-
creased driver and passenger protection if the vehi-
cle is involved in a front-end collision. The airbag
system is designed to be used in conjunction with
the seat belt system.
Whenever the ignition switch is turned to the
Run or Start position, theACM performs a warning
indicator bulb-check via a PCI bus request to the
instrument cluster to illuminate the Airbag Warn-
ing Indicator. The indicator remains illuminated for
6 to 8 seconds, and then turns off. If the indicator
remains off, the ACM has checked the system and
found it to be free of discernable malfunctions.
The ACM monitors critical input and output
circuits within the airbag system, ensuring the
circuits are operating properly. Some circuits are
1
GENERAL INFORMATION

tested continuously; other circuits are tested only
under certain circumstances. The ACM provides
diagnostic information about the airbag system to
the technician through the DRBIIItvia the PCI bus.
The deceleration of g-forces resulting from the
impact of a front-end collision causes the electronic
sensor inside of the ACM to be triggered. This
causes the inflators to be actuated, thus deploying
the airbag(s). The total time between determining
to deploy and deflation of the air bag is 1/10th of one
second (100ms).
The 2006 Jeep Wrangler (TJ) may be equipped
with a Passenger Airbag (PAB) On - Off Switch.
This switch has an ACM-controlled light that will
illuminate when the switch is in the Off position.
Use the test procedures in this manual to diag-
nose the cause of any customer complaint regarding
theAirbag Warning Indicator (located in the instru-
ment cluster), such as:
•Airbag warning indicator does not illuminate at
any time
•Airbag warning indicator is illuminated at all
times
3.1.1 PASSENGER AIRBAG ON-OFF
SWITCH
Vehicles without rear seats will be equipped with
a PassengerAirbag (PAB) On - Off Switch. The PAB
On - Off Switch allows the vehicle operator to turn
the passenger airbag function On or Off.
The Off indicator in the PAB On - Off Switch will
be illuminated for 2 seconds whenever the ignition
is transitioned to the Run position as a bulb check.
The Off indicator will remain illuminated when the
PAB On - Off Switch is turned to the Off position.
The PAB On - Off Switch assembly is mounted in
the center of the instrument panel below the radio,
this allows the Off indicator to be visible to both
front seat occupants.
WARNING: TO AVOID PERSONAL INJURY OR
DEATH, ALWAYS CHECK THE PASSENGER
AIRBAG ON - OFF SWITCH POSITION BEFORE
DRIVING THE VEHICLE. A SWITCH IN THE
WRONG POSITION INCREASES THE RISK OF
SERIOUS INJURY OR DEATH IN A COLLISION.
To operate the Passenger Airbag On - Off Switch,
insert the ignition key into the PAB On - Off Switch
keyway, push the key in to release the internal
plunger, and rotate switch to the desired position.
The spring-loaded locking plunger prevents the
user from leaving the key in the switch. The key
will be automatically ejected from the switch when
inward force is not applied. The ignition key is the
only key or object that should ever be inserted into
the PAB On - Off Switch.
NOTE: Do not turn the Passenger Airbag On -
Off Switch while the ignition is in the Run
position.
TheACM continuously monitors the resistance of
the Passenger Airbag On - Off Switch circuits to
identify the switch position and to provide switch
circuit diagnostics.
•ON Position: Passenger Airbag On - Off Switch
resistance = 175 to 190 ohms
•OFF Position: Passenger Airbag On - Off Switch
resistance = 820 to 870 ohms
If the ACM detects that the PAB On - Off Switch
circuits are open, shorted to ground, or shorted to
battery voltage, it will set Active and Stored DTC’s.
When a DTC is detected by the ACM, it will trans-
mit a PCI bus message to the Instrument Cluster to
illuminate the Airbag warning indicator. Whenever
the Airbag warning indicator is illuminated, the
ACM should be the first module to be interrogated.
If after replacing the ACM, any of the following
codes are active, the ACM must be re-configured to
match the vehicle equipment:
•MODULE NOT CONFIGURED FOR PAB OFF
SWITCH
•PASSENGER AIRBAG ON - OFF SWTCH CIR-
CUIT OPEN
•PASSENGERAIRBAG ON - OFF SWTCH INDI-
CATOR CIRCUIT OPEN
To properly configure the ACM, using the
DRBIIIt, select Miscellaneous from the Airbag sys-
tem menu and follow instructions.
WARNING: IGNORING THE AIRBAG WARNING
INDICATOR IN THE INSTRUMENT CLUSTER
COULD MEAN THE PASSENGER AIRBAG ON - OFF
SWITCH IS NOT FUNCTIONAL AND THE
PASSENGER AIRBAG MAY DEPLOY IF AN IMPACT
OCCURS. IF THE AIRBAG WARNING INDICATOR
ILLUMINATES, WHILE DRIVING, THE AIRBAG ON -
OFF SWITCH WILL REMAIN FUNCTIONAL FOR
THAT KEY CYCLE. IF THE AIRBAG WARNING
INDICATOR ILLUMINATES AGAIN AT THE NEXT
IGNITION ON AND STAYS ILLUMINATED FOR
MORE THAN6-8SECONDS, THE ACM WILL
DEFAULT TO PASSENGER AIRBAG ON. IF THE
AIRBAG WARNING INDICATOR BULB TEST OR IF
THE OFF INDICATOR DOES NOT ILLUMINATE
WITH THE SWITCH IN THE OFF POSITION THE
PASSENGER AIRBAG MAY DEPLOY IF AN IMPACT
OCCURS. FAILURE TO TAKE THE PROPER
PRECAUTIONS COULD RESULT IN ACCIDENTAL
AIRBAG DEPLOYMENT AND PERSONAL INJURY
OR DEATH.
2
GENERAL INFORMATION

3.1.2 SPECIAL TOOLS
Some airbag diagnostic tests use special tools, the
8310 and 8443 airbag load tools for testing squib
circuits. The load tools contain fixed resistive loads,
jumpers, and adapters. The fixed loads are con-
nected to cables and are mounted in a storage case.
The cables can be directly connected to some
airbag system connectors. Jumpers are used to
convert the load tool cable connectors to other
airbag system connectors. The adapters are con-
nected to the module harness connector to open
shorting clips and to protect the connector terminal
during testing.
When using the load tool, follow all of the safety
procedures in the service information for discon-
necting airbag system components. Inspect the wir-
ing, connector, and terminals for damage or mis-
alignment.
Substitute the airbag load tool in place of a Driver
or Passenger airbag, curtain airbag, clockspring, or
seat belt tensioner, (use a jumper if needed). Then
follow all of the safety procedures in the service
information for connecting airbag system compo-
nents.
Read the module active DTC’s. If the module
reports NO ACTIVE DTC’S, the defective compo-
nent has been removed from the system and should
be replaced. If the DTC is still active, continue this
process until all of the components in the circuit
have been tested.
Then disconnect the module connector and con-
nect the matching adapter to the module connector.
With all airbags disconnected and adapter in-
stalled, the squib circuits can be tested for open and
shorted conditions.
3.1.3 DIAGNOSTIC TROUBLE CODES
Airbag diagnostic trouble codes (DTC) consist of
active and stored codes. If more than one DTC
exists, diagnostic priority should be given to the
active code(s). Each DTC is diagnosed by following a
specific testing procedure. The diagnostic test pro-
cedures contain step-by-step instructions for deter-
mining the cause of the DTC. It is not necessary to
perform all of the tests in this manual to diagnose
an individual DTC.
Always begin by reading the DTC’s using the
DRBIIIt. If more than one code exists, diagnostic
priority should be given to active code(s).
Active DTC’s for the airbag system are not per-
manent and will change the moment the cause of
the code is corrected. In certain test procedures
within this manual, DTC’s are used as a diagnostic
tool.
3.1.3.1 ACTIVE CODES
An active trouble code indicates an on-going mal-
function. This indicates that the defect is currently
active every time the ACM checks the particular
circuit or function. It is impossible to erase an active
code; active codes automatically erase themselves
when the cause for the code has been corrected.
With the exception of the warning indicator trou-
ble codes or malfunctions, when a malfunction has
been detected by the ACM, the Airbag warning
indicator is illuminated for a minimum of 12 sec-
onds, or as long as the malfunction is present.
3.1.3.2 STORED CODES
Airbag codes are automatically stored in theACM
memory as soon as the malfunction is detected,
with the exception of the Loss Of Ignition Run-Only
code, which is an active code only. A stored code
indicates that there was an active code present at
some time. However, the code currently may not be
present as an active code, although another active
code may be.
When a trouble code occurs, the Airbag warning
indicator illuminates for 12 seconds minimum,
(even if the condition existed for less than 12
seconds). Stored codes display the time in minutes
that the code was active, and the number of times
that the ignition has been cycled since the active
code was last detected.
The minimum time shown for any code will be
one minute, even if the code was actually present
for less than one minute. Thus, the time shown for
a code that was present for two minutes 13 seconds,
for example, would be three minutes.
If a malfunction is not active while performing a
diagnostic test, the active code diagnostic test will
not locate the source or the condition. In this case,
the stored code can indicate an area to inspect. The
following procedure may uncover a malfunction
that is difficult to locate:
WARNING: TO AVOID PERSONAL INJURY OR
DEATH, MAINTAIN A SAFE DISTANCE FROM
ALL AIRBAGS WHILE PERFORMING THE
FOLLOWING INSPECTION:
If no obvious problems are found:
•Erase the stored codes
•Place the ignition in the Run position
•Wiggle the wire harness and connectors
•Rotate the steering wheel from stop to stop
•Recheck for active codes periodically as you work
through the system.
3
GENERAL INFORMATION

3.2 AUDIO SYSTEM
Some radio systems available on the 2006 TJ
communicate on the PCI Bus. They use the bus for
three reasons. The first is to communicate trouble
codes, second is to receive dimming information,
and the third is to receive cabin equalization infor-
mation. The audio system is available in a 4
speaker base system and a 7 speaker system with
an external subwoofer.
When troubleshooting output shorts or “output”
error messages, the following applies:
On radios without an external amplifier, the term
output refers to the path between the radio and the
speaker. This type of circuit can be monitored all
the way through the speaker connections by the
radio assembly. When the radio displays a shorted
output DTC with this type of system, the speaker,
radio, or wiring could be at fault.
On radios with an external amplifier, the term
“output” refers to the circuit between the radio
connector and the amplifier. The radio is capable of
monitoring only this portion and can tell nothing
about the circuit between the amplifier and the
speakers. Consequently, a shorted output DTC on
this type of system would only refer to this circuit.
A faulty speaker could not cause this DTC.
3.2.1 SATELLITE RADIO (SDARS)
To use the satellite radio, the radio must be in
satellite mode. The satellite antenna must have an
unobstructed view of the satellite. The vehicle must
be outside to receive proper reception. Poor recep-
tion may be experienced in large down town areas
where tall buildings are present. The satellite net-
work is still under development, and this could be
the cause of poor reception in certain areas. Use a
known good system to verify network performance
in these areas.
Once in satellite mode, the radio head is used to
change stations. The Radio must be in Satellite
mode to communicate to the Satellite Receiver
Module with the DRBIIIt. The Radio head commu-
nicates to the Satellite Receiver Module via the PCI
bus and the private Audio bus. The Audio bus
functions just like the PCI bus, but its use is
restricted to the Radio and the Satellite Receiver
Module.
The Satellite Receiver Module processes signals
it receives from the satellite antenna. That infor-
mation is then sent to the Radio where it is pro-
cessed and sent out to the speakers. The Satellite
Receiver Module has the ability to detect and store
fault code information, which may be retrieved with
the DRBIIIt. Refer to the service manual for addi-
tional information on the SDAR system and its
related components.
3.3 ELECTROCHROMIC
COMPASS/TEMPERATURE MIRROR
WITH LIGHTS
DESCRIPTION
The optional self-dimming Electrochromic
Compass/Temperature Mirror has a vacuum fluores-
cent (VF) display that is integrated into the rear
view mirror. The Compass/Temp Mirror includes the
compass/temperature display and two map/reading
lamps. This display provides the outside tempera-
ture and one of eight compass headings to indicate
the direction the vehicle is facing. The Compass/
Temp Mirror displays the compass heading and the
outside temperature at the same time. The Ambient
Temperature Sensor monitors the outside tempera-
ture and is hardwired to the Compass/Temp Mirror.
BUTTON OPERATION
The Compass/Temp Mirror incorporates 3 (mode/
lamp) buttons to access and control various functions.
Left Button
•Press and Release
> Toggles Left Map Light On/Off
•Press w/ Right Switch for more than 5 seconds
and Release
> Toggles Electrochromic Status On/Off
-automatic On with each ignition cycle
> On mode is indicated by green status LED
next to right button
Center Button
•Press for more than 3 seconds and Release
> Cycle through display status
– Compass / Temperature (Fahrenheit) - °F
mode stored to memory
– Compass / Temperature (Celsius) - °C mode
stored to memory
– Display Off - off mode stored to memory
•Press and Hold for 3-6 seconds
> Activate zone variance mode (adjust compass
for true north)
–9Z9and the currently programmed zone
(1-15) will flash in display window
– Each press of the center button will incre-
ment to the next zone
– When proper zone is selected, wait 5 sec-
onds and mirror display returns to comp/temp
(see variance zone map for proper zone num-
ber setting)
•Press and Hold for more than 6 seconds
> Activate compass calibration
–9CAL9shows in display window until com-
pass is calibrated (verify correct variance zone
4
GENERAL INFORMATION