Fault-Tracing Information

Fault-tracing

Fault-tracing information

Note! This trouble code is only relevant for troubleshooting and action in the following cases:

- The trouble code is active in the present driving cycle and has been active for a longer period of time.
- The customer experiences malfunction that can be attributed to the trouble code.
In other cases, the DTC does not indicate a fault and must therefore be ignored and only erased.

Do you want to continue fault-tracing?

Yes - Checking the battery voltage

No - DONE

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Checking the battery voltage




- Ignition on.
- Read the supply voltage values for the Brake control module (BCM) and the Central Electronic Module (CEM).
The supply voltage values for the Brake control module (BCM) and the Central Electronic Module (CEM) should be approximately the same.
The fault is permanent if the voltage for the brake control module (BCM) deviates by more than 2.0 V from the central electronic module (CEM).
If the voltage is approximately the same, this indicates an intermittent fault, i.e. the fault was present previously but is not active at the moment.





Continue - 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





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.
- Ignition on.
- Read the supply voltage values for the Brake control module (BCM) and the Central Electronic Module (CEM).
The voltage must be approximately battery voltage.





Was the voltage OK?

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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