Fault-Tracing Information

Fault-tracing

Checking the battery voltage




- Start the engine. Allow the engine to idle.
- Connect a voltmeter between the battery positive and negative terminals.
The voltage must be normal system voltage. If the voltage is too low, check the charging system according to the relevant information.

Was the voltage too low?

Yes - FAULT FOUND

No - Checking the power supply

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Checking the power supply




- Ignition off.
Check the connector of the Brake control module (BCM). Check for contact resistance and oxidation.
Check the power supply cable between the Brake control module (BCM) fuse in the engine compartment relay/fuse box and terminal #A32 (#32). Check for a short circuit to ground.

Hint: With the ignition on and the voltmeter connected between terminals #A32 (#32) and #A47 (#A47) on the breakout box, the voltmeter should show battery voltage.

Other information
- Connecting the breakout box Connecting the Breakout Box, Brake Control Module (BCM)
- Signal description, brake control module (BCM) Signal Description, Brake Control Module (BCM)
- Checking wiring and terminals Checking Wiring and Terminals. Permanent Faults





Continue - Verification

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Verification

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




- Ignition off.
- Reinstall the connectors, components etc.
- Start the engine.
- Read off the power supply to the brake control module (BCM).





The voltage must be normal system voltage.

OK - FAULT FOUND

Not OK - 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 the battery voltage

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