Alps Electric TWB1U773 User manual

User’s Manual
Passive Entry System
Model No.: TWB1U773
There is no User’s Manual because this equipment will not be sold to end-
user directly.

CONTENTS
1. PREFACE
2. PASSSIVE ACCSESS ENTRY FUNCTIONALITY
2.1. Door Unlocking
2.2. Engine Start
2.3. Engine Stop
2.4. Door Locking (Push switch)
3. ACTIVE ACCESS ENTRY FUNCTIONALITY
3.1. Door Unlocking
3.2. Engine Start
3.3. Engine Stop
3.4. Door Locking
3.5. Trunk Open
4. ENTRY SYSTEM OPTIONS
4.1. System Schematic
4.2. Modules
4.2.1. FOB ECU
4.2.2. Entry System ECU
5. SYSTEM CHARACTERISTICS
5.1. Antenna Areas
5.2. Exciter Locations
5.3. Switch Input Locations (Door handle)
6. ELECTRICAL CHARACTERISTICS
6.1. FOB
6.2. Entry System ECU
FCC WARNING
NOTICE

1.Preface
This document describes the requirements and operation of the Passive Entry System. However, this
document is especially for the Entry system ECU (acronym for Electric Control Unit) and the FOB.
The FOB consists the following functionality for passive access and active access:
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Door unlocking / locking (however, only for request by means of switch operation)
Trunk open (however, only for request by means of switch operation)
LF decoding
RF encoding
Communication data encryption (cryptograph, anti-collision, rolling code and stuff)
And the entry system ECU consists of the following functionality:
Door unlocking / locking
Trunk open
Engine start (/ stop)
LF encoding
RF encoding
Communication data encryption (cryptograph, anti-collision, rolling code and stuff)
LF antenna unit control
Communication with the node ECUs connected to the body bus (e.g. CAN, J1850, customer
dependent bus)
As a further function, both the FOB and the entry system ECU provides the following function:
Learning mode for programming the manufacturing data and stuff
Data locking and password protection
Diagnostic (based upon ISO9141 if required)

2.Passsive Accsess Entry Functionality
A handle sw located on, for example the door handles, mirrors and trunk lid will be used for proximity
check if user is in neighborhood of the vehicle. The switch input will trigger for unlocking and open the
doors and trunk.
Door Handle SW
Figure 1
2.1.Door Unlocking
User pushes door handle sw.•
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ECU sends LF-challenge via exterior antenna.
FOB sends RF-response to the ECU.
Door unlocking status is engaged.
Doors are opened.
RF
LF
FOB
Figure 2

2.2.Engine Start
User operates the engine start knob.•
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ECU sends LF-challenge via interior antenna.
FOB sends RF-response to the ECU.
Immobilizer ECU receives and authorize the response.
Engine controller ECU receives the authorization for engine strat.
FOB
RF
LF
Start the engine.
Figure 3
2.3.Engine Stop
User operates the engine stop knob.•
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ECU communicates with the other ECU for engine start request.
Engine controller ECU receives the request.
Stop the engine
Figure 4

2.4.Door Locking (Push switch)
User closes the door and pushes the switch (sensing of door locking switch).•
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ECU sends LF-challenge via exterior antenna.
FOB sends RF-response to the ECU.
Door locking status is engaged.
Doors are locked.
(Indicates the door locking status by means of Flasher / Buzzer or stuff)
Figure 5

3.Active Access Entry Functionality
3.1.Door Unlocking
Same functionality as the current one.
3.2.Engine Start
This function does not effect on the active entry system.
3.3.Engine Stop
This function does not have influence on the active entry system.
3.4.Door Locking
Same functionality as the current one.
3.5.Trunk Open
Same functionality as the current one.

4.Entry System Options
4.1.System Schematic
4.2.Modules
Body Bus
OTHER ECUS
LF (>2Kbps)
Local Bus
ECU ECU ECU
433.92MHz
RF Tuner
Tuner signal
125kHz
FOB
ENTRY SYSTEM ECU
RF (>4Kbps)
4.2.1.FOB ECU
Panic
433.92M
Hz
125kHz Emergency key (Transponder)
Trunk
Unlock
Lock
Z
FOB
RF
Amp
LF
Amp
Y
X
ASIC
4.2.2.Entry System ECU
Tuner signal Interior Antenna
LF
Excite
r
LF
Excite
r
LF
Excite
r
LF
Excite
r
Room1
Dr
A
sTrunk
Exterior Antenna
125kHz
Dr : Driver Door Antenna
A
s : Assist Door Antenna
Trunk : Bumper Antenna
Room1: Console Antenna
Room2: Inst. Antenna
Room3: Trunk Antenna
LF
Excite
r
LF
Excite
r
Room2 Room3
Local Bus
Body Bus
Push knob
(Engine start knob)
Dr Door handle
A
s Door handle
Trunk
MCU
ENTRY SYSTEM ECU

5.System Characteristics
5.1.Antenna Areas
Exterior operating range: 0.8m to 1.5m
Interior operating range: Only inside the car
Number of the exterior exciters : typ.3, however, it is depending on the type of the vehicle.
Number of the interior exciters: max.4 (min.2)
Dr
Interior
Exterior
As
Back
Figure 6
Exterior antenna functionality:
Unlock / lock doors.•
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Open trunk.
Activate / deactivate alarm system.
Activate immobilizer
Interior antenna functionality:
Deactivate immobilizer
Engine start

5.2.Exciter Locations
Exterior exciters: 3 doors
Interior exciters: 1 Center Console
2 Inst panel
3 Trunk
Bumper
Interior
Exterior
Dr As
Figure 7
Antenna location can be different among of type of the vehicle (e.g. coupe, sedan, mini and stuff).

5.3.Switch Input Locations (Door handle)
There are some switches, for instance the door handle contact switch will be used as a triggering for
unlocking and open the door.
Switch inputs: 3 doors
Dr As
Trunk
Figure 8
Switch inputs can be different among of type of the vehicle (e.g. coupe, sedan, mini and stuff).

6.Electrical Characteristics
6.1.FOB
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ASK / FSK modulation Transmission：FSK Reception：ASK
Operating supply voltage 2.5V ~ 3.3V (3.0V Battery)
Operating supply current < 35mA
Stand-by current < 10.0uA
Operating ambient temperature -10oC to +60oC
Antenna direction 3-Dimension (X, Y, Z), to be considered
Battery life 1.5 Years (Low battery indication is considered)
6.2.Entry System ECU
Operating supply voltage 9.0V ~ 16.0V
Operating supply current < 55mA
Stand-by current < 4.0mA
Operating ambient temperature -30oC to +80oC

FCC WARNING
Changes or modifications not expressly approved by the party responsible for compliance
could void the user’s authority to operate the equipment.
NOTICE
This device complies with Part 15 of the FCC Rules and RSS-Gen of IC Rules.
Operation is subject to the following two conditions:
(1) this device may not cause harmful interference, and
(2) this device must accept any interference received, including interference that may
cause undesired operation.