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), B8444S, B6324S Connecting the Breakout Box.
- 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), B8444S, B6324S Connecting the Breakout Box
- 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 - Troubleshooting procedure complete
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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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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