Signal Missing. Permanent Fault
Signal missing. Permanent fault
Checking component
- Make a note of the anti-theft radio code.
- Ignition off.
- Disconnect the battery negative lead.
- Disconnect the connector from the seat belt tensioner.
Warning! Under no circumstances use an ohmmeter or other live measuring instrument to take readings on a disconnected non-deployed pyrotechnical seat belt tensioner. This could deploy the seat belt tensioner!
- Install special tool 998 8695 TEST DEVICE 998 8695 Test Device on the seat belt tensioner connector.
Caution! The special tool must be checked and faultless. If the tool is defective it will cause errors in the diagnosis and make fault-tracing harder.
- Ignition on.
- Connect the battery negative lead.
- Read off diagnostic trouble codes (DTCs).
If the fault is in the seat belt tensioner the diagnostic trouble code (DTC) status should now have switched to intermittent fault. Try replacing the seat belt tensioner and carrying out a new verification afterwards.
Other information:
- To access / replace the seat belt tensioner, see Seat belt Service and Repair.
Does the diagnostic trouble code (DTC) status change?
Yes - Verification
No - Checking components and wiring
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Checking components and wiring
- Ignition off.
- Remove special tool 998 8695 TEST DEVICE 998 8695 Test Device.
- Disconnect the battery negative lead.
- Disconnect the control module.
Warning! Under no circumstances use an ohmmeter or other live measuring instrument to take readings on a disconnected non-deployed pyrotechnical seat belt tensioner. This could deploy the seat belt tensioner!
Check the control module connector for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Check for damage carefully.
Connect an ohmmeter between seat belt tensioner #1 and #2. Check for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Remedy as necessary.
Other information:
- To access / replace the control module, see SRS control module Service and Repair.
- A short-circuit element in the control module connector ensures that there is contact between the positive and negative leads when the control module is disconnected. Otherwise the seat belt tensioner may deploy unintentionally.
Select Continue when the fault has been remedied.
Continue - Verification
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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 status of the diagnostic trouble code (DTC) has changed to intermittent.
Does the status change?
Yes - VERIFIED
No - VERIFICATION FAILED
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VERIFIED - FAULT FOUND
VERIFICATION FAILED - Fault-tracing information
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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 - Exit fault-tracing
No - Attempt New Test
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Attempt New Test - Checking component
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