Signal Too Low. Permanent Fault

Signal too low. 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 on a disconnected, non-deployed airbag module. This could deploy the airbag!

- Install special tool 951 1506 Test dummy 951 1506 Test Dummy 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.

- Ignition on.
- Connect the battery negative lead.
- 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 Airbag steering wheel module, steering wheel and contact reel Airbag Steering Wheel Module, Steering Wheel and Contact Reel Replacement.

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 connector from the contact reel.
Connect an ohmmeter between contact reel #1 and ground. Check for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Replace the cable harness if there is a short-circuit in the cable.
The contact reel must be replaced if the resistance is infinite.
Remedy as necessary.

Other information:
- To access / replace the contact reel, see Airbag steering wheel module, steering wheel and contact reel Airbag Steering Wheel Module, Steering Wheel and Contact Reel Replacement.









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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