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module. If HHT displays an "F", go to step 3.2.
Read TEST CONNECTION (NOT FOR HHT) column. Horn -air bag clockspring connector A45x1, terminals
No. 1 and 2 are identified. Read TEST CONDITION column. Test circuit with HHT connected to DLC.
Remove ignition key. Connect Resist ance Substitution Unit (124 589 09 63 00) to horn-air bag clockspring
connector A45x1. Set resistance s ubstitution unit to 2 ohms. Read NOMINAL VALUE-HHT DISPLAY
column. If HHT displays a check, check horn-air ba g clockspring for continuity. Replace horn-air bag
clockspring as necessary. If HHT displays an "F", go to step 3.4.
MODEL IDENTIFICATION
COMPONENT IDENTIFICATION
NOTE: Some testing is identified
by model number. Refer to table to identify models by
model number. See MO DEL IDENTIFICATION
table.
Model NumberModel
129SL Class
140S Class
163M Class
170SLK Class
202C Class
203C 240 & C 320
208CLK Class
210E Class
215CL 500
220S 430 & S 500
ComponentManufacturer's Designation
A1e15SRS warning light
A45Horn-air bag clockspring
A53Driver-side air bag sensor
A54Passenger-side air bag sensor
B41-1Passenger-side seat occupied recognition sensor
N2-2SRS control module
N2-7SRS control module
N72e1Automatic child seat recognition light
R12-1Driver-side ETR squib connector
R12-2Passenger-side ETR squib connector
R12-3Driver-side air bag squib connector
R12-8Passenger-side air bag squib connector
R12-9Side air bag (driver-side) squib connector
R12-10Side air bag (passenge r-side) squib connector
R12-20Passenger-side air bag squib
2001 Mercedes-Benz ML320
2000-01 ACCESSORIES/SAFETY EQUIPMENT Merc edes-Benz - Air Bag Restraint Systems
me
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Page 386 of 4133

CONTROL MODULE PROGRAMMING
After control module replacement, SRS warning light will blink or illuminate continuously. This indicates need
to program and set paramete rs of SRS control module. This process requires use of Hand-Held Tester (965 589
00 01). During programming, the follow ing conditions need to be met:
Vehicles Without Side Air Bag
Version with passenger-side air bag module, when replac ing SRS control module is to be set to YES when
programming control module. Version with seat belt buckle switch is to be programmed NO.
Vehicles With Side Air Bag
Version is set to YES when replacing SRS control module. Version with seat belt buckle switch is set to YES.
Seat occupation recogni tion is set to YES.
Parameters
After programming, SRS warning light wi ll continue to blink, indicating need to set parameters. Currently,
parameters set is identical for all models.
DIAGNOSTIC TESTS
R12-21Driver-side air bag squib
R12-22Left window air bag squib
R12-23Right window air bag squib
S68-3Driver-side belt buckle switch
S68-4Passenger-side belt buckle switch
W26Control module ground
X11-4Data link connector
X11-1310-pin SRS test connection
2001 Mercedes-Benz ML320
2000-01 ACCESSORIES/SAFETY EQUIPMENT Merc edes-Benz - Air Bag Restraint Systems
me
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Page 387 of 4133
Fig. 10: SRS & ETR Diagnosis (2000 Models, Except E Class-1 Of 17)
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
2001 Mercedes-Benz ML320
2000-01 ACCESSORIES/SAFETY EQUIPMENT Merc edes-Benz - Air Bag Restraint Systems
me
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Page 388 of 4133
Fig. 11: SRS & ETR Diagnosis (2000 Models, Except E Class-2 Of 17)
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
2001 Mercedes-Benz ML320
2000-01 ACCESSORIES/SAFETY EQUIPMENT Merc edes-Benz - Air Bag Restraint Systems
me
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Page 389 of 4133
Fig. 12: SRS & ETR Diagnosis (2000 Models, Except E Class-3 Of 17)
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig. 13: SRS & ETR Diagnosis (2000 Models, Except E Class
-4 Of 17)
2001 Mercedes-Benz ML320
2000-01 ACCESSORIES/SAFETY EQUIPMENT Merc edes-Benz - Air Bag Restraint Systems
me
Saturday, October 02, 2010 3:44:46 PMPage 25 © 2006 Mitchell Repair Information Company, LLC.
Page 390 of 4133
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fig. 14: SRS & ETR Diagnosis (2000 Models, Except E Class
-5 Of 17)
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
2001 Mercedes-Benz ML320
2000-01 ACCESSORIES/SAFETY EQUIPMENT Merc edes-Benz - Air Bag Restraint Systems
me
Saturday, October 02, 2010 3:44:46 PMPage 26 © 2006 Mitchell Repair Information Company, LLC.
Page 391 of 4133
Fig. 15: SRS & ETR Diagnosis (2000 Models, Except E Class-6 Of 17)
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
2001 Mercedes-Benz ML320
2000-01 ACCESSORIES/SAFETY EQUIPMENT Merc edes-Benz - Air Bag Restraint Systems
me
Saturday, October 02, 2010 3:44:46 PMPage 27 © 2006 Mitchell Repair Information Company, LLC.
Page 392 of 4133
Fig. 16: SRS & ETR Diagnosis (2000 Models, Except E Class-7 Of 17)
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
2001 Mercedes-Benz ML320
2000-01 ACCESSORIES/SAFETY EQUIPMENT Merc edes-Benz - Air Bag Restraint Systems
me
Saturday, October 02, 2010 3:44:46 PMPage 28 © 2006 Mitchell Repair Information Company, LLC.