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 driver's airbag.
Warning! Under no circumstances use an ohmmeter or other live measuring instrument to take readings from a disconnected, undeployed airbag module. This could deploy the airbag!
- Install the special tool 998 8695 TEST DEVICE 998 8695 Test Device on the driver's airbag 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.
- Connect the battery negative lead.
- Ignition on.
- Read off diagnostic trouble codes (DTCs).
If the fault is in the driver's airbag, the status of the diagnostic trouble code (DTC) will have switched to an intermittent fault. Try replacing the driver's airbag and then carrying out a new verification.
Other information:
- To access / replace the driver's airbag, see Steering wheel module, steering wheel and contact reel, replacement Airbag Driver's Side (SRS), Replacing.
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.
- Disconnect the battery negative lead.
- Remove special tool 998 8695 TEST DEVICE 998 8695 Test Device.
- Ignition on.
- Disconnect the control module.
Warning! Under no circumstances use an ohmmeter or other live measuring instrument to take readings from a disconnected, undeployed airbag module. This could deploy the airbag!
Check the control module connector and the contact reel 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 driver's airbag #1 and #2 and between contact reel #1 and #2. Check for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
Check the contact reel 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 the control module connector, see Sensor module, replacement Service and Repair.
- To access / replace the driver's airbag, see Steering wheel module, steering wheel and contact reel, replacement Airbag Driver's Side (SRS), Replacing.
- To access the contact reel, see Steering wheel module, steering wheel and contact reel, replacement Airbag Driver's Side (SRS), Replacing
- 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 airbag module may deploy unintentionally.
Select "Continue" when the fault has been remedied.
Continue - Verification
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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 status of the diagnostic trouble code (DTC) has changed to intermittent.
Does the status change?
Yes - VERIFIED
No - VERIFICATION FAILEDPAPER
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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 - FAULT-TRACING FAILED
No - Attempt New Test
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FAULT-TRACING FAILED - FAULT-TRACING FAILED
Attempt New Test - Checking component
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