SRS System MIL ON - False trouble Codes
SI. No.850-2077PI No.
Date: April 1999
Distr.: all
9-5
False diagnostic trouble codes in Airbag system (SRS)
cars affected
Saab 9-5 4D M999 up to and including VIN
X3027793
Background
On occasions, the AIR BAG lamp may go on without the presence of a permanent fault in the airbag system. Apparently, the fault can be insufficient crimping of cable lugs in the electrical harness between the control unit and the seat connector. Diagnostic trouble code B2863 or B2868 will then be generated.
In the event of complaints from customers, proceed as follows.
Note:
Provided the VIN limits are applicable, the measures described in SI 850-2108 "False diagnostic trouble codes from side airbag" are also to be carried out.
Parts required
51 07 842 Wiring hamess (CA: 30581757)
79 71 880 Cable tie, 3 pcs. (CA: 30509027)
79 84 784 Cable tie, 2 pcs. (CA: 30551667)
30 04 785 Fabric-backed tape (CA: 30559732)
Tools
85 80 151 Connector pin removal toolkit
86 12 335 Reference resistor
These tools were issued as Essential Special Tools.
If you need additional quantities, you can order directly from Kent-Moore at 1-800-345-2233.
Procedure
1. Remove seats as described in WIS, see 8. Body / Seats / Front seat.
2. Remove centre console as described in WIS, see 8. Body / Interior equipment / Centre console.
3. Fold back the carpets to expose the wiring harness and cable conduits. Open the cover on the cable conduits on both sides.
4. Unplug the connector from the control unit.
5. Cut off cable tie from cable outlet and unplug connector.
6. Extract cable lugs from positions 10,11, 13 and 14. Press away lock tab with a small screwdriver.
Note:
The lock tab may have to be pressed away a second time when the cable lug is half way out of the connector.
7. Clip off the cable lugs, fold cable ends back on wiring - harness and secure with tape.
8. Lay new wiring harness with the car's ordinary harness. Orange cables to left-hand seat and white cables to right-hand seat.
Important:
Take care not to damage the cable lugs when laying the cable.
9. Insert cables into connector
Orange cables to positions 10 and 11.
White cables to positions 13 and 14.
10. Plug in connector and fit cable tie round cable outlet.
11. Extract the cable lugs from positions 7 and 9 in the 29-pin connector for each seat. Use special tool 85 80 151.
Clip off the cable lugs, fold cable ends back on wiring harness and secure with tape.
12. Insert cable lugs in positions 7 and 9 in each connector.
Orange cables to left-hand seat and white cables to right-hand seat.
13. Tape new wiring harness to existing one. Start at 29-pin connector on each side and secure with tape down to cable conduits.
Detach clip from air duct for better access (do not remove from wiring harness).
14. Attach clip to air duct
WARNING:
Ensure cables are clear of sharp edges.
15. Cut off cable tie securing wiring harness to handbrake lever.
16. Secure new wiring harness with tape to existing one from the connector by control unit down to cable conduits.
Fit new cable tie.
Fold any excess cable into the cable conduits.
17. Connect Tech 2.
18. Connect a reference resistor, part no. 86 12 335, to driver's seat connector.
19. Switch on the ignition.
20. Clear diagnostic trouble codes in SRS system.
21. Read diagnostic trouble codes. An open circuit should be indicated for passenger seat.
22. Turn off ignition.
23. Transfer reference resistor to passenger seat.
24. Switch on the ignition.
25. Clear diagnostic trouble codes in SRS system.
26. Read diagnostic trouble codes. An open circuit should be indicated for driver's seat.
27. If other codes generated; check that harness is connected correctly.
28. Replace carpet. Fit scuff plates and air vents for rear seat.
29. Fit center console as described in WIS, see 8. Body / Interior equipment / Centre console.
30. Fit seats as described in WIS, see 8. Body / Seats / Front seat.
31. Clear diagnostic trouble codes and make sure resistance in SRS circuit for each seat is 2.5 +/- 0.3 ohms with Tech 2.
Disconnect Tech 2.
32. Start engine and see if AIR BAG lamp indicates a fault.
Warranty/Time Information
Failed Object: 37136
Fault/Reason code: 61
Location code: 09 (US=0)
Warranty Type (US):01
Repair/Action code: 01
Labour Operation (US): 37136
Time: 1.8 (CA: N1731 1.8 hrs)
FOR DSC DEALERS, PLEASE ADD THE FOLLOWING INFORMATION TO YOUR DCS
TABLES:
OPERATION NUMBER TABLE:
OPERATION NUMBER: 37136
DESCRIPTION: REPLACE SRS WIRING HARNESS
TRANS. TYPE: B
ENG. TYPE: 9
DIAG CODE REQD: 0
9-5
HOURS: 1.8
BEGIN YR.: 99
END YR.: 99
DISCLAIMER