Troubleshooting

Troubleshooting BCM-C004664

Checking the connectors








- Ignition off
- Check the connectors of the brake control module (BCM) and the brake pressure sensor for contact resistance and oxidation.
- Reinstall the components, reconnect the connectors etc.
- Ignition on
- Read off the brake system pressure.
- Depress the brake pedal.
The brake pressure indicated by both pressure sensors should increase with increased pressure on the pedal. If the brake pressure indicated by both pressure sensors increases, the malfunction was caused by contact resistance in the connectors of the control module or the pressure sensor.

Other information
- To access brake control module (BCM) 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 pressure increase?

Yes - FAULT FOUND

No - Checking wiring and sensors

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Checking wiring and sensors




- Ignition off
- Connect a breakout box.
Check the ground cable between the relevant brake pressure sensor and the brake control module (BCM) for an open circuit.
For pressure sensor A, check the cable between pressure sensor #1 and brake control module (BCM) #19 (#A19).
For pressure sensor B, check the cable between pressure sensor #1 and brake control module (BCM) #21 (#A21).
If the cable is OK, try a new pressure sensor.

Other information
- Connecting the breakout box, brake control module (BCM), B6324S5 Connecting the Breakout Box, Brake Control Module (BCM)
- For pressure sensor replacement: Pressure sensor, master cylinder, replacing Service and Repair





Was any defect found on the cable?

Yes - Verification

No - Checking the brake control module (BCM)

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Checking the brake control module (BCM)








- Ignition off
- Reinstall the components, reconnect the connectors etc.
- Ignition on
- Read off the brake system pressure for the relevant pressure sensor.
- Depress the brake pedal.
Brake pressure should increase with increased pressure on the pedal.





Does brake pressure increase?

Yes - Verification

No - Troubleshooting information

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Verification




Verification

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








- Ignition off
- Reconnect the connectors, components, etc.
- Ignition on
- Read off the brake system pressure for the relevant pressure sensor.
- Push down the brake pedal.
Brake pressure should increase with increased pressure on the pedal.





Does brake pressure increase?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - FAULT FOUND

VERIFICATION FAILED - Troubleshooting information

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Troubleshooting information

Attempt New Test - Checking the connectors

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Troubleshooting information




Information

Fault-tracing information
The fault should be diagnosed and remedied. Since this is not the case the fault-tracing process has failed.
Complete the fault-tracing for those fault or try again.

Do you want to terminate fault-tracing at this time?

Yes - Exit fault-tracing

No - Attempt New Test

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Attempt New Test - Checking the connectors

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