Signal Too Low or Signal Missing

Signal too low or signal missing

Checking the component








- Ignition off
- Disconnect the 3-pin connector from the left front seat belt buckle
- Disconnect the connector from the Supplemental Restraint System Module (SRS)

Hint: The diagnostic trouble code (DTC) is not stored until the fault has been present continuously for at least 3 minutes.

Check the female and male parts of the connectors for the Supplemental Restraint System Module (SRS) and the seat belt buckle. The cable terminals must not be damaged or pressed back.
Check the cable between the Supplemental Restraint System Module (SRS) terminal #26A (26) and the seat belt buckle #54/24:5 left front. Check for a short-circuit to ground. Check for an open-circuit.
Check the resistance in the signal cable between the Supplemental Restraint System Module (SRS) terminal #26A (26) and seat belt buckle #54/24:4 left front. The resistance must be infinite.

Hint: If the signal cable between the Supplemental Restraint System Module (SRS) and the seat belt buckle connector is OK, the seat belt buckle may be damaged. Check the signal cable between the seat belt buckle connector and the seat belt buckle. The signal cable must not be damaged. Check that nothing has become jammed in the seat belt buckle.

If the fault is permanent and no fault is found, replace the seat belt buckle.
Remedy as necessary.

Other information:
- To access and replace the SRS control module and connector, see Control module SRS (supplemental restraint system), replacing Service and Repair
- To access and replace the seat belt buckle, see Buckle seat belt front, replacing Front Seat
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box, Supplemental Restraint System Module (SRS)
- For information about signals, see Signal specification Signal Specification, Supplemental Restraint System Module (SRS)
- For information about the repair of SRS wiring, see Cable harness SRS system, repair Procedures
- Checking wiring and terminals Checking Wiring And Terminals.










Continue - Verification

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Fault-tracing information




Information

Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Do you want to exit fault-tracing?

Yes - FAULT-TRACING FAILED

No - Attempt New Test

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FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking the component

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Verification




Verification

Verification

Hint: After carrying out the repair, check that the fault has been remedied.




- Ignition off
- Disconnect the battery negative lead
- Reinstall the connectors, components etc.
- Ignition on
- Connect the battery negative lead.

Warning! There must not be anyone inside the passenger compartment when the battery is connected.

- Read off diagnostic trouble codes (DTCs).
The fault is no longer present if the diagnostic trouble code (DTC) status is intermittent.





Is the diagnostic trouble code (DTC) intermittent?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - Fault Found

VERIFICATION FAILED - Fault-tracing information

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