Troubleshooting

Troubleshooting BCM-C002201

Checking the connectors




- Ignition off
- Check the connectors of the brake control module (BCM) and the pressure build-up valve/pedal pressure sensor for contact resistance and oxidation.
- Reinstall the components, reconnect the connectors etc.
- Ignition on
- Use the Activation function to activate the pressure build-up valve.
The status should switch between OFF and ON.

Other information
- For removal of the control module connectors: Connecting the breakout box, brake control module (BCM), B6324S5 Connecting the Breakout Box, Brake Control Module (BCM)
- Checking wiring and terminals Checking Wiring and Terminals









Does the status switch between OFF and ON?

Yes - FAULT FOUND

No - Checking wiring and sensors

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Checking wiring and sensors
Check the cables between the pressure build-up valve for open circuit, short-circuit to ground and short circuit to voltage.
Measure between:
- Pressure build-up valve terminal #3 and brake control module (BCM) terminal #31 (#A31).
- Pressure build-up valve terminal #4 and brake control module (BCM) terminal #17 (#A17).

Hint: With the ignition off and the pressure build-up valve disconnected, check the pressure build-up valve by measuring the resistance between pressure build-up valve connector terminals #3 and #4 on the breakout box. The resistance must be approximately 3 ohms.

Remedy as necessary.

Other information
- Connecting the breakout box, brake control module (BCM), B6324S5 Connecting the Breakout Box, Brake Control Module (BCM).
- Signal specification, brake control module (BCM) with DSTC (dynamic stability and traction control), B6324S5 Signal Specification, Brake Control Module (BCM) With DSTC (Dynamic Stability and Traction Control)
- For replacing the pressure build-up valve (brake booster): Power brake booster, replacing Service and Repair





Was a malfunction detected?

Yes - Verification

No - No Fault Found

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Verification

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








- Ignition off
- Reinstall the components, reconnect the connectors etc.
- Ignition on
- Use the Activation function to activate the pressure build-up valve.
The status should switch between OFF and ON.









Does the status switch between OFF and ON?

Yes - FAULT FOUND

No - Troubleshooting information

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Troubleshooting 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 connectors

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