Troubleshooting

Troubleshooting BCM-C002001

Checking pump motor function








- Ignition off
- Check the connectors of the brake control module (BCM) and the pump motor for contact resistance and oxidation.
- Reconnect the connectors, components, etc.
- Ignition on
- Activate the pump motor.
Check that the pump motor starts and runs normally.
If the pump motor starts and runs normally, the malfunction was probably caused by contact resistance and oxidation in the brake control module (BCM) or pump motor connectors.

Other information
- Brake Control Module (BCM), replacing Service and Repair
- Checking wiring and terminals Checking Wiring And Terminals





Is pump function OK?

Yes - FAULT FOUND

No - Checking the wiring and component

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Checking the wiring and component




- Ignition off
Check the pump motor circuit between brake control module (BCM) terminal #1 (#A1) and the battery for open circuit and short circuit to ground.
Check if the brake system fuse is damaged. If so, check the cable between the fuse and brake control module (BCM) terminal #1 (#A1) for short circuit to ground and then replace the fuse.
Check the pump motor circuit by connecting an ohmmeter between pump motor connector #2 and ground. The ohmmeter should indicate infinite resistance.
Remedy as necessary.

Other information
- Connecting the breakout box, brake control module (BCM), B6324S5 Connecting The Breakout Box
- Checking wiring and terminals Checking Wiring And Terminals.
- For further information about the fuses and relays, see the Wiring Diagram





Was a malfunction detected?

Yes - Verification

No - Checking the pump motor circuit

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Checking the pump motor circuit




- Ignition off
- Remove the brake control module (BCM).
- Connect adapter 951 2856 Test cable 951 2856 Test cable to the pump motor voltage connection.
- Connect the red cable, connected across a fuse, to battery voltage. The black cable should be connected to a grounding point.
The pump motor should start when the cable is connected. Run for maximum 10 seconds.
If the pump motor starts and runs normally, replace the brake control module (BCM).
If the pump motor does not start, replace the hydraulic unit.

Other information
- Brake Control Module (BCM), replacing Service and Repair
- Hydraulic unit, replacing Service and Repair





Continue - Verification

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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
- Activate the pump motor.
Check that the pump motor starts and seems to run normally.





Is pump function OK?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - FAULT FOUND

VERIFICATION FAILED - 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 pump motor function

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