Page 1929 of 4133
4. Unscrew sheet metal screws ( 30) from instrument panel.
5. Install mount (15) together with interface between mounting lugs (31) and (32) as shown in figure and
fasten with sheet metal screws (30).
6. Route connection plug for adapter wiring ha rness (D) upward into the radio recess.
Fig. 379: Identifying Mounting Lugs And Sheet Metal Screws
7. Connect portable cellular telephone wiring harn ess (2) to adapter wiring harness (9).
8. Check fuse (23) (a 10A fuse should be present).
Fig. 380: Identifying Fuse A nd Telephone Wiring Harness
9. Connect adapter wiring harness (9) to radio connector.
2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electr ical System - Body - 163 Chassis
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Fig. 381: Identifying Portable Cellular Telephone Wiring Harness And Connector For Adapter
Wiring Harness
RETROFIT WIRING HARNESS - AZ82.70-P-0001-04GH
1. Prepare portable CTEL wiring harness (2) as shown in figure.
Fig. 382: Identifying Portable CTEL Wiring Harness
2. Attach CTEL interface (A34/4) to interface mount (15) with 2 torx screws (16).
3. Attach GSM 1800 MHz compensator (A28/3) to mount (15) with 2 torx screws (16).
4. Connect portable cellular telephone wiring harness (2) to CTEL interface (A34/4).
5. Connect branch of portable CTEL wiring harness (2) to GSM 1800 MHz compenstor (A28/3).
6. Connect antenna cables to GSM 1800 MHz compensator (A28/3).
2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
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Page 1931 of 4133
Fig. 383: Identifying Portable Cellular Telephone Wiring Harness And Components
7. Unscrew self-tapping screws (50) at instrument panel.
Insert mount with control modules from above through the radio opening.
8. Connect fiber optic cable.
9. Insert mount (15) with interface as shown in figure between the two mounting plates (51) and (52) and
attach with the self-tapping screws (50).
10. Route microphone connector (C) and adapter wiring harness connector (D) upward into radio shaft.
Fig. 384: Identifying Self
-Tapping Screws And Microphone Connector
11. Connect portable CTEL wiring harness (2) to adapter wiring harness (9).
12. Inspect fuse (23) (a 10A fuse must be fitted).
2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
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Saturday, October 02, 2010 3:30:13 PMPage 436 © 2006 Mitchell Repair Information Company, LLC.
Page 1932 of 4133

Fig. 385: Identifying Fuse And Portable CTEL Wiring Harness
13. Expose tied back green 2-pin connector (E) for standard microphone lead and connect with microphone
connector (C) from portable cellular telephone wiring harness (2).
14. Connect adapter wiring harness (9) to radio connector.
15. Fit together radio connector C and adapter (A2/C).
On models fitted with COMAND (code 352) the radio connector C is part of the COMAND wiring
harness in the form of an intermediate connector (must be exposed).
Fig. 386: Identifying Radio And Connector For Adapter Wiring Harness
Depending on vehicle equipment (vehicles without navigation system Audio 30 APS or COMAND or
with navigation system) the connection of the telephone antenna differs.
A Only for models without navigation system
16.1 On vehicles without navigation system the antenna connection cable (ANT) is connected directly to
the black (sw) connector of the antenna cable (19) and connected to the GSM 1800 MHz compensator
(A28/3).
A Only for models with navigation system
16.2 On vehicles with navigation system the antenna cable (ANT) is connected to the antenna diplexer
(A2/57). The antenna connection cable (19/1) is connected to the red (rt) socket at the antenna diplexer
2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
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Page 1933 of 4133
(A2/57) and to the GSM 1800 MHz compensator (A28/3).
Fig. 387: Identifying
17 The GSM 1800 MHz compensator is connected to the antenna cable (17) at the mount for the portable
CTEL (1).
RETROFIT WIRING HARNESS - AZ82.70-P-0001-04GHH
Model 163 as of 1.9.00 for Nokia 6090 fixed installation cellular telephone
1. Prepare telephone wiring harness (2) as shown in figure.
2. Tie back audio line-out cable with 4-pin connector (25) (is not required).
3. Expose two red (rt) and two black (sw) cables.
4. Cut off the two 2-pin connector housings of microphone speaker to the size of 350 mm as shown in figure
and expose the leads (the are provided with a new connector housin
g).
2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
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Page 1934 of 4133

Fig. 388: Identifying Telephone Wiring Harness
5. Unlock catch (arrows) of connector (21) one detent.
6. Fit cable terminals (22) to the red (rt) leads and insert into chambers 3 and 9 of the connector (21).
7. Fit cable terminals (22) to the black (sw) leads and insert into chambers 4 and 6.
8. Insulate orange cable and tie back (is not required).
9. Fit cable terminal (22) to blue (bl) lead and insert into chamber 5.
10. Fit cable terminal (22) to yellow (ge) lead and insert into chamber 2.
11. Fit cable terminal (22) to gray (gr) lead and insert into chamber 7.
12. Lock connector (21).
Fig. 389: Locating Catch Of Connector
13. Fit flat connector (52) to screening (sch) of microphone cable and insert into chamber A (on right) of
green connector housing (50).
14. Fit flat connector (52) to white cable of internal conductor of microphone (ws) and insert into chamber B
(on left) of green connector housing (50).
15. Close connector housin
g with the catch (51).
2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
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Page 1935 of 4133
Fig. 390: Identifying Flat Connect or, Connector Housing & Catch
16. Fit flat receptacle (57) to the back cable (sw) and insert into chamber A (on left) of the black receptacle
housing (55).
17. Fit flat receptacle (57) to the black/white cable (sw/ ws) and insert into chamber B (on right) of the black
receptacle housing (55).
18. Close receptacle housing (55) with catch (56).
Fig. 391: Identifying Flat Recept acle, Receptacle Housing & Catch
19. Insert wiring harness (2) into instrument panel working from the glove compartment.
The tie
d-back part must be placed belo w the strut (arrows) at the glove compartment.
2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electr ical System - Body - 163 Chassis
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Saturday, October 02, 2010 3:30:14 PMPage 440 © 2006 Mitchell Repair Information Company, LLC.
Page 1936 of 4133
Fig. 392: Locating Wiring Harness
20. Connect telephone wiring harness (2) to adapter wiring harness (9).
21. Check fuse (23) (a 10A fuse should be present).
Fig. 393: Identifying Telephone Wiring Harness To Adapter Wiring Harness Connection & Fuse
22. Connect adapter wiring harness (9) to radio wiring harness and insert into radio slot.
23. Place microphone cable of telephone wirin
g harness (2) into radio slot.
2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electr ical System - Body - 163 Chassis
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Saturday, October 02, 2010 3:30:14 PMPage 441 © 2006 Mitchell Repair Information Company, LLC.