Mercedes-Benz 124 1994 Operating and installation instructions

Mercedes-Benz service information
TO:OUR MERCEDES-BENZ PASSENGER CAR DEALERS
DATE: . November 1993 (supersedes S.I. MBNA 82/70, Aug.1993)REF. NO. MBNA 82/70a
Revision: to W.I. 302a andnew W.l.'s 303and304for models 124and202 respectively
SUBJECT:MODELS124,129, 140AND202
M.Y. 1994
INSTALLATION OF CELLULAR TELEPHONESYSTEM
Attached to this Service Information are Work Instructions for installation ofthe cellular telephonesystem
in model124,129, 140and202 modelyear1994 vehicles.
NAM Programming Guide S-2503-093 is valid for M.Y.1994model129, 140 vehicles (withcore kitQ6
82 0140).
NAM ProgrammingGuideS-2499-A92 is valid for models124,201,202.
©1993
Mercedes-Benz of NorthAmerica,Inc. Allrights reserved. Reproduction or translation in
Mercedes-Benz Canada,Inc.whole orin part isnot permittedwithoutauthorization
Service and PartsLiterature from the publisher.Printed in U.S.A.

Mercedes-Benz Service
Group: 82
Work Instructions Date: November1993 Number: 302a
SUBJECT: MODELS 129AND140
M.Y.1994
INSTALLATION OF CELLULARTELEPHONESYSTEM
INSTALLINGIN-DASHCONTROLLER(IDC)
1. Unpackcontents of installation kitand compare to parts list atendof work instructions. Readthrough
entire workinstructionprocedure to familiarize yourselfwithsequence of instructions and parts.
Remove OperatingGuidefrom kitand place in Owner'sLiteraturepouch.
2. Disconnect and covernegativebatteryterminal.
3. Examine inside of eyeglass compartment for presence ofa non-lined plastic "false back".
FOR EYEGLASSCOMPARTMENT WITH FALSE BACK (Steps4-9)
4.If falseback is installed,removal ofthe eyeglasscompartment isnot necessary.
5. Remove two screws securing false back to eyeglass compartment. Removefalseback to expose two
12-poleconnectors andone microphoneconnector.Removecables from falseback.Falseback and
original mountingscrews maybe discarded.
6. Install IDC mountingbracket. Position mountingbracket so thatmountingholesalignwithfalseback
mountingholes.Securebracket with four4x10 mm selftappingscrews.
7. Attach two self-adhesiveretainer clips to rear of
in-dashcontrollerwith the open end facing up
(Figure 1).
8. Connect two 12-po|econnectors to in-dash
controller. Connectmicrophoneconnector to
connection ontop center of controller.
Figure 1
©1991Mercedes-Benz of NorthAmerica,Inc. All rightsreserved.Reproduction or translation in whole
Mercedes-Benz Canada, Inc. orin part isnot permittedwithoutauthorization from the
Service and PartsLiteraturepublisher.Printed in U.S.A.

2
9. Secureleftcable and microphonecable to clips
on back of IDC.Slidein-dashcontrollerinto
bracket and snap intoplace - DONOT PRESS
ONTHELCD DISPLAY.
Figure 2
FOR EYEGLASSCOMPARTMENTWITHOUT FALSE BACK (Steps 10- 20)
10. If false back isnot installed, removeeyeglasscompartment(SMS,Body-assemblyjobs, Jobno.
68-155).
Note:Removelockcylinder to avoid damagingdashboardcovering.
11. Carefully cutoutthe recessedopening onthe
back oftheeye glasscompartment(Arrow,
Figure 3).Use cautionwhencutting soasnot
to damage the compartmentliner. Cut liner
insidecompartmentwith utility knife.File down
any sharpplasticedges.
Figure 3
W.I. 302a,Grp. 82

3
12. Place template (a)ontopof eyeglass
compartment (Figure 4).
13. Locate, punch and drill 5 mm holes according to
template.
14. Countersink holes by hand using 8.5mm drill
bit.
Figure 4
15. Place controller bracket in eyeglass
compartment. Insert two flat head screws
through topof eyeglass compartment, finger
tighten square nuts.
Figure 5
16. Slide in-dash controller into bracket and snap
into place - DONOT PRESS ONTHELCD
DISPLAY. Center controller and then tighten
two flat head screws.
17. Insert removal tool (b) into two slots ontopof
IDC, push down onthetopofthe tool and then
pull on tool to remove IDC.
Figure 6
W.I. 302a, Grp. 82

4
18. Attach two self-adhesive retainer clips to rear of
IDC with the open endofthe clips facing up.
19. Guide wires forIDC through round opening in
back ofthe eyeglass compartment.
Note: Model 140 Only
Guide two in-dash controller cables and microphone
cable tothetop right inside ofthe eyeglass
compartment. Secure cables totop right inside
corner of compartment opening using metal clip,
slide clip toward youto engage.
Figure 7
20. Reinstall eyeglass compartment with controller
bracket. Remove protective covers from ends
of controller cables and attach to in-dash
controller. Secure left cable and microphone
cable to clips on back of IDC. Slide IDC into
bracket and snap into place - DONOT PRESS
ON THELCD DISPLAY.
Figure 8

5
INSTALLING HANDSET (HS)
A. Model 129
B. Model 140
A. Model 129
1. Remove carpeting from center console.
2.Cutand remove styrofoam, uptothe horizontal
chamfer (arrows, Figure 9), from underside of
carpeting. Remove material from lip around the
underside of carpeting so reinforcing plate can
sit flat.
3. Place reinforcing plate on back of carpeting
(Figure 9).
4. Locate, punch and drill four inner holes to5 mm
5. Insert four screws through reinforcing plate and
carpeting. Mount cradle on carpeting and
secure screws.
Figure 9
6. Drill outer holes through carpeting to match the
diameter ofthe mounting plate holes.
7. Remove two forward screws in center console
compartment.
8. Place angular cradle bracket in console with
raised edge of bracket pointing towards the rear
of the compartment (Figure 10). Secure
bracket using thetwo removed screws.
Figure 10
W.I. 302a. Grp. 82

6
9. Replace carpeting and cradle into center
console compartment. Harness cord should be
routed onthe right side with cord taped to
chamfers on underside of carpeting. Secure
carpeting with two screws'(arrow, Figure 11)to
angle bracket in compartment.
10. Connect harness connector tothe right side
cradle connection andthe handset connector to
the left side (Figure 11). Place handset in
cradle.
Figure 11
B. Model 140
1. Open armrest and place cradle inside
compartment. The front edge ofthe cradle
must touch the front wall ofthe armrest, and
thetwo holes inthe cradle must be centered
over the small pre-punched holes inthe armrest
floor (use a good shoplight to locate holes).
Figure 12
2. Attach coil cord retaining spring to notches on
underside of cradle.
3. Attach cradle and cord spring to armrest using
two M4x14 pan head tapping screws. Cover
screws with rubber caps with white stripe facing
downward.
Figure 13
W.I. 302a, Grp. 82

7
4. Connect 90° angle connector from coil cord to
handset.
5. Remove protective cover from connector at rear
of armrest.
6. Slide cord over spring, starting with the straight
connector. Clip last coil onto the front endof
the spring.
7. Connect straight connector to connector at rear
of armrest.
INSTALLING TRANSMITTER/RECEIVER (TR)
A. Model 129
B. Model 140
A. Model 129
1. Remove left trunk panel and taillamp assembly.
2. Assemble TRto mounting plate using brackets.
3. Attach pig-tail junction boxto plate, secure with cable tie.
4. Connect cable from junction boxtoTR.
5. Remove protective caps from studs in bottom of wheel well.
6. Partially remove carpeting from left trunk area.
7. Install clips to longitudinal rail over existing holes. Replace carpeting.
8. Position transmitter - receiver mounting plate over studs in wheel well. Insert sheet metal screws
through holes inTR plate into clips, donot tighten. Place nuts on studs and tighten. Tighten sheet
metal screws.
9. Connect white 4-pole connector (power supply) toTR.
10. Connect male speaker connector from vehicle harness to female speaker connector in junction box.
11. Disconnect 4-pole connector from antenna. Open connector locking strap. Insert bare connector
from antenna adapter harness into location "2"ofthe 4-pole connector. Insert from rear of
connector. Observe proper pin orientation. Close locking strap. Reconnect 4-pole connector to
antenna.
12. Connect 1-pole female junction box connector to round connector on antenna adapter harness.

8
13. Connect telephone harness data cable to junction boxonTR plate.
14. Connect oneendofthe antenna lead cable totheTR,the other endtothe "Telefon" connection on
the splitter box.
15. Secure loose wires/cables with cable tie.
16. Reinstall left wheel well liner and taillamp
assembly.
17. Install 8 A fuse in auxiliary fuse box (located in
trunk, above battery, Figure 15).
18. Reconnect negative battery terminal.
19. Program telephone.
20. Recede radio.
21. Test function.
Figure 15
B. Model 140
1. Remove trunk mat, left trunk panel and taillamp
assembly.
2. Install TR onto metal plate (left of sound system
amplifier) using two clips (one at each end), and
#8x5/8" sheet metal screws. Make certain that
the antenna connector faces downward.
3. Connect oneendofthe antenna lead cable to
theTR,the other endtothe "Telefon"
connection onthe splitter box.
Figure 16 Model 140 Sedan
Figure 17 Model 140 Coupe

9
4. Disconnect 4-pole connector from antenna. Open connector locking strap. Insert bare connector
from antenna adapter harness into location "2"ofthe 4-pole connector. Insert from rear of
connector. Observe proper pin orientation. Close locking strap. Reconnect 4-pole connector to
antenna.
5. Connect junction boxas follows:
a female speaker connector to male speaker
connector near white 4-pole TR power
connector
b 1-pole male antenna control connector to1-
pole round connector on antenna adapter
harness
cTR data connector toTR
d junction box connector to vehicle TR data
harness
Figure 18
6. Connect white 4-pole connector (power supply) toTR.
7. Secure adapter harness toTR mounting plate using cable ties.
8. Reinstall left wheel well liner and taillamp assembly.
9. Install 7.5A fuse in auxiliary fuse box (located in trunk, behind panel in right trunk liner).
10. Reconnect negative battery terminal.
11. Program telephone.
12. Recode radio.
13. Resynchronize window settings.
14. Test function.
INSTALLING HANDSFREE MICROPHONE
A. Model 129
B. Model 140
A. Model 129
1. Place template on headliner panel, so that it touches the left edge ofthe dome lamp assembly. Mark
location of mounting hole.
2. Remove dome lamp assembly.
W.I. 302a, Grp. 82

10
3. Punch and drill a 5/8" hole in headliner panel. A forstner bitis highly recommended to avoid
damaging the headliner panel.
Use caution so as not to damage any harnesses behind the panel.
4. Clip microphone onto mounting plate.
5. Install microphone pigtail through hole in headliner.
6. Place microphone and mounting plate against headliner and fasten by pressing retaining clip onto
post.
7. Connect microphone pigtail to 3-pole pre-wire connector. Slide connector into channel closest to
windshield, to left of dome lamp opening.
8. Reinstall dome lamp assembly.
A. Model 140
1. Place template over dome lamp assembly. Use left reading lamp switch asa guide. Mark location of
mounting hole.
2. Remove dome lamp assembly and center-fill speaker.
3. Punch and drill a 5/8" hole in headliner panel. A forstner bitis highly recommended to avoid
damaging the headliner panel.
Use caution so as not to damage any harnesses behind the panel.
4. Clip microphone onto mounting plate.
5. Place microphone and mounting plate against headliner and fasten by pressing retaining clip onto
post.
6. Install microphone pigtail through hole in headliner.
7. Connect microphone pigtail to 3-pole pre-wire connector. Slide connector into space to left of dome
lamp opening.
8. Reinstall dome lamp assembly and center-fill speaker.
INSTALLATION OF OPTIONAL REAR SEAT LIMO KIT
Model 140
1. Remove and verify contents of kit.
2. Remove left wheel well liner. Lower and open rear armrest.
3. Remove armrest liner and folding lid. There are eight (8) screws to remove; twoon plastic hinge, two
on front latch, two under thecup holders andtwoat rear of compartment.
4. Remove armrest lidand rear hinge from liner. Discard old armrest liner.
W.I. 302a, Grp. 82

11
5. Measure and mark location on rear of
replacement armrest liner. Measure in40mm
from left side and17mmup from bottom. Drill
a 13mm hole. File down any rough edges.
6. Transfer armrest lidand rear hinge to
replacement armrest liner.
7. On rear of plastic hinge, measure over
approximately 23mm from the left side andcut
a 8 mm semi-circular relief to accommodate
handset cord, asper figure.
Figure 19
8. Locate two rear screw holes on underside of replacement armrest liner and carefully punch thru
fabric. Enlarge holes in fabric using an awl.
9. Place template in armrest liner. Using an awl, punch four cradle mounting locations.
10. Drill four 4.5mm holes. Clean rough edges and liner carpeting.
11. From underneath armrest liner, secure handset cradle using four M4x12 bolts.
12. Guide long handset cord thru opening in rear of liner. Leave one coil on outside of liner to keep
cord in position. Install cut grommet into cable opening.
13. Secure liner to armrest with six screws; twoatthe plastic hinge, twoatthe front latch andtwoatthe
rear ofthe compartment.
14. Remove short handset cord from handset and discard.
15. Connect cord to handset. Place handset in cradle.
16. Remove rear bench cushion (job no. 91-170) or left rear seat cushion (job no. 91-173) on vehicles
with four-place seating option.
17. Remove anodized trim on left side of rear seat.
18. Feed a thin guide wire from underneath the seat back(next to center seat belt buckle) into armrest
opening.
19. Secure straight endof handset cord to guide wire and carefully pull back until cord reemerges by
seat belt buckle.
20. Secure handset cord to cable tie next to seat belt buckle.
W.I. 302a, Grp. 82

12
21. Route handset cord upto front of seat edge and along vacuum lines securing as necessary.
Note: Keep cord away from moving parts. Route cord with armrest in horizontal position to allow
sufficient slack in cord.
22. Remove plastic cover by door sill. Connect 2 m
cable to handset connector (arrow, Figure 20).
Place connection under plastic cover and
replace cover.
23. Route other endof cable up C-pillar under trim
clips (arrows). At rear door latch level (upper
arrow), route cable end into trunk using guide
wire.
24. Continue to route cable along vacuum lines in
left wheel well. Connector should emerge by
the left rear wheel well housing ground (W6).
Secure with cable ties as necessary.
25. Disconnect 12pin data cable from transmitter - receiver. Connect data cable toany connection on
junction box.
26. Connect 2 m cable to junction box.
27. Connect oneendof1.5m cable to junction box. Connect other endto transmitter - receiver.
28. Secure with cable ties as necessary.
29. Test function of rear seat telephone.
W.I. 302a, Grp. 82

13
Parts Information____________________
Part Name_________________Application_________Part Number / Exchange
Cellular telephone core kit Models 129, 140Q 6 82 0140
(MBNA Core Pack III)
each kit contains:
Transmitter - receiver Q6 82 0155 / Q 6 82 0156
In-dash controller (IDC) Q6 82 0148 / Q 6 82 0158
Handsfree microphone Q 6 82 0153
Owner's Guide S-2496-093
Cellular telephone installation kit Model 129Q 6 82 0142
(MBNA 129 Install Kit III)
each kit contains:
Handset with cord Q 6 82 0073 / Q 6 82 0095
Cradle Q 6 82 0074
Transmitter - receiver mounting bracket Q682 0077
IDC mounting bracket Q 6 82 0149
Cradle bracket Q 6 82 0080
Handset mounting plate Q 6 82 0081
Transmitter - receiver junction boxQ6 82 0086
Hardware kitQ 6 82 0152
Antenna coax cable Q 6 82 0091
Antenna adapter harness Q 6 82 0165
Card & holder kit_______________________________Q 682 0087______ __
Cellular telephone installation kit Model 140Q 6 82 0143
(MBNA 140 Install Kit III)
each kit contains:
Handset Q 6 82 0147 / Q 6 82 0157
Cradle Q 6 82 0145
Antenna adapter harness Q 6 82 0165
Retention spring Q 6 82 0144
Transmitter - receiver junction boxQ682 0086
IDC mounting bracket Q6 82 0150
Hardware kitQ 6 82 0151
Antenna coax cable Q 6 82 0091
Coil cord Q 6 82 0146
Card & holder kit ___________________Q 682 0087__________
Rear seat limo kit Model 140Q 6 82 0118
each kit contains:
Handset Q 6 82 0119 / Q 6 82 0139
Cradle Q 6 82 0130
Junction boxQ 6 82 0123
Handset cord Q 6 82 0121
Hardware kitQ 6 82 0132
1.5m straight cable (male-male) Q6 82 0133
2 m straight cable (male-female)___________________Q 6 82 0131__________
Armrest liner __________________________Q 6 92 0001____________
W.I. 302a. Grp. 82

14
Recommended Labor Time______________________________________
Description ______ Time Model(s)
Cellular telephone, install 1.5hr. 129,140
(incl. NAM Programming)
Special Tools
Cellular ftft
Telephone Test
Installation Microphone
& Service KitI C
900 589028200900589028201900589028202900589028203
MY 94
Cellular
Telephone
Installation
& Service
Kit Upgrade
900 589038200
IMPORTANT!
The.Cellular Telephone Installation/Warranty Registration Card (S-2488-A92) MUST BE FILLED OUTand
mailed to:
Mercedes-Benz of North America, Inc.
One Mercedes Drive
Montvale NJ 07645
Attn: Warranty Department
If the card isnot filled outand mailed in, future warranty claims forthe telephone will be denied.
W.I. 302a, Grp. 82

Mercedes-Benz Service
Group: 82
Work Instructions Date: November 1993 Number: 303
SUBJECT: MODEL 124
INSTALLATION OF CELLULAR TELEPHONE SYSTEM
INSTALLING TRANSMITTER/RECEIVER (TR)
A. Model 124 Except 124.066/090
B. Model 124.066
C. Model 124.090
A. Model 124 Except 124.066/090
1. Unpack contents of installation kitand compare
to parts list atendof work instructions. Read
through entire work instruction procedure to
familiarize yourself with sequence of instructions
and parts. Remove Operating Guide from kit
and place in Owner's Literature pouch.
2. Disconnect and cover negative battery terminal.
3. Remove trunk carpeting and left wheel well
liner.
Figure 1
4. Measure 20cm from sill to rear ofTR bracket.
5. Trace footprint of bracket along liner. Using a
utility knife carefully cut along the sides and
bottom of liner making a flap. Fold liner back.
6. Punch and drill all three mounting holes using a
3mm drill. Clean any metal shavings and apply
zinc dust paint.
7. Place four pieces of rubber padding ontopand
bottom TR brackets.
Figure 2
© 1990 Mercedes-Benz of North America, Inc. All rights reserved. Reproduction or translation in whole
Mercedes-Benz Canada, Inc. orin part isnot permitted without authorization from the
Service and Parts Literature publisher. Printed in U.S.A.

2
8. Locate and expose TR cable.
9. Connect oneendofthe antenna cable tothe
"Telefon" terminal onthe antenna splitter.
Route other endof antenna cable along TR
cable.
10. Replace wheel well liner.
11. Secure lower bracket to trunk using only the
center mounting location at this time.
Figure3
12. Connect 25pin transmitter connection and
antenna cable toTR. Place TRin lower bracket
ensuring that the25pin connector is against
the trunk wall.
13. Connect loose endof antenna cable toTR.
Figure 4
14. Place top transmitter bracket over TR using
center hole asa locator over secured screw
ensuring that the long endofthetop bracket
hangs over the25pin connector. Secure with
two M4x12 sheet metal screws.
15. Fold carpeting flap over bracket screws. Trim
as necessary.
16. Replace trunk carpeting.
Figure 5
W.I. 303,GRP. 82

3
B. Model 124.066
1. Remove trunk carpeting, first aid kit.
2. Remove small piece of carpeting from right
hand side of trunk (beneath first aid kit) to
reveal TR bracket and harness (Figure 6).
3. Remove bracket by removing thetwo front bolts
and loosening the third rear bolt (donot remove
completely) and lift bracket upandout (Figure
6).
4. Connect antenna lead and25pin transmitter
connection toTR (ensuring that the25pin
connector ison top).Install TRand secure
three bolts(Figure 7).
5. Reinstall carpeting over TR, first aidkitand trunk
carpeting.
C. Model 124.090
1. Open right cargo compartment door.
2. Remove rear windshield washer reservoir. Disconnect electrical connection.
W.I.303,GRP. 82

4
3. Guide TR bracket through reservoir opening.
Position bracket in opening as depicted in
Figure 8. Securely clamp bracket into place.
The two semi-circular cut-outs onthe bracket
serve as locators forthe mounting screws on
panel. Position cut-outs over cargo panel
mounting screws.
Dimensions:
A. 2.0mm
B. 1.5mm
Figure 8
4. Punch and drill two3 mm holes (arrows, Figure 8).Be certain that you drill through both the frame
and theTR bracket. Remove clamp and bracket from opening. Enlarge holes to4.5mm. Remove
any metal shavings and apply zinc dust paint to bare metal edges.
5. Place two rubber strips onthe bottom andtopTR brackets. Assemble bracket.
6. Install TR into bracket so that theTR connections will be facing the rear ofthe vehicle and that the
harness pin connector ison top.
7. Connect oneendofthe antenna lead cable totheTR.
8. Guide TR/bracket assembly into place asper Figure 7 and secure using number 8 sheet metal
screws. Ensure that theTR DOES NOT CONTACT THE FUEL FILLER NECK OVERFLOW HOSE.
9. Connect other endof antenna lead from TRto "telefon" connection of antenna splitter (guide cable
under frame).
10. Connect harness connection toTRand secure with thumb screws.
11. Reconnect and install rear windshield washer reservoir.
12. Close cargo door.
Note: Itmaybe necessary to remove some oftherib material inthe area ofthetwo fastening screws
for the cargo door to close properly
W.I. 303, GRP. 82

5
INSTALLING HANDSET (HS)
1. Open armrest and remove plug from rear of
compartment. Carefully drill outthetwo forward
recesses using care notto drill into the
threaded inserts (arrows, Figure 9).
Figure 9
2. Attach coil cord retaining spring to notches on
underside of spacer. Place spacer/spring to
underside of cradle.
3. Attach cradle and spacer/spring to armrest
using two M4x14 screws. Cover screws with
rubber caps.
Figure 10
4. Remove protective cover from connector at rear
of armrest.
5. Slide cord over spring, starting with the straight
connector. Clip last coil onto the front endof
the spring.
6. Connect handset connector to connector at rear
of armrest.
Figure 11
W.I. 303, GRP. 82