Recall - SRS Control Module Modification
Campaign No. 2000070003November 2000
FILE:
SERVICE:
GROUP 00 OF SERVICE INFORMATION BINDER
PARTS:
GROUP I OF INFORMATION - PARTS & ACCESSORIES BINDER
TO: ALL MERCEDES-BENZ CENTERS
SUBJECT:
MODEL 163.154/172 (M.Y. 2000)
AUDIBLE SEAT BELT WARNING CHIME
This campaign has been initiated due to an operational defect in the audible seat belt chime. All Mercedes-Benz M-Class vehicles are equipped with a seat belt warning chime that, is designed to sound when a driver is seated in a vehicle, the vehicle is started, but the driver's seat belt has not yet been buckled. In certain Model Year 2000 Mercedes-Benz M-class vehicles, the seat belt chime also sounds when the seat belt is fastened. In order to correct this operational defect, the SRS control module (N212) must be replaced and the splice diode (1, Figure 1) must be removed.
Prior to performing this Recall Campaign, please check VMI to insure the vehicle is involved and to determine if the vehicle has been previously repaired.
Effective Serial Number Range
Procedure
1. Remove ignition key from ignition lock.
2. Remove instrument cluster.
See WIS: AR54.30-P-6015GH
3. After removing instrument cluster, locate splice diode (1, Figure 1) which is approx. 10cm behind the instrument cluster connector (A1 Figure 1), between circuits 1814 (green) and circuit 2104 (yellow). Remove tape to expose the white diode case and then release locks on sides of diode case to open diode case.
4. After opening the diode case, carefully lift and release each wire from its contact terminal.
5. Discard the "splice diode".
6. Separately insulate each wire at point where splice contact had pierced the wire insulation. Electrical insulation tape should extend 20 mm beyond both sides of pierced insulation. Additionally, using electrical tape, completely tape over the exposed section of the harness where the splice diode was removed.
Note:
If the splice diode is NOT removed and an updated SRS control module (N212) is installed, the seat belt warning chime will activate on startup with the driver seat belt buckled.
7. Reinstall instrument cluster (see WIS: AR54.30-P-6015GH).
8. Connect Star Diagnosis System (SDS) and check the part number of the SRS control module (N212). If part number 002 542 49 18 is present, then remove this control module (see WIS: AR91 .60-P-0623GH) since it will be replaced by an updated version in repair step # 9. When removing the control module, ensure that the ignition key is in position 0.
9. Install new SRS control module (see WIS: AR91.60-P-0623GH) as noted in the "Parts Information" table.
10. Using Star Diagnosis, version code the newly installed SRS control module (N212).
11. Access instrument cluster with Star Diagnosis.
Note:
As of January 2000, DAS update for Star Diagnosis will automatically activate the "Lamp Test delay" function whenever diagnostic communication is made with the instrument cluster. "Lamp Test Delay" function is a hidden function and is not viewable.
12. Finally, read out and erase any relevant fault codes with Star Diagnosis.
13. Perform an operational test to ensure the proper operation of the seat belt warning chime.
Parts Information
Warranty Information
Associated Warranty Claim Submission Information