Troubleshooting
Troubleshooting BCM-C111802
Checking the connectors
- Ignition off
- Check the connectors of the brake control module (BCM) and the pedal pressure sensor for contact resistance and oxidation.
- Reinstall the components, reconnect the connectors etc.
- Ignition on
- Read off the pedal pressure sensor status.
The status should be OFF if the brake pedal is not actuated and should switch to ON when the brake pedal is actuated. If the status changes, the malfunction was probably caused by contact resistance or oxidation in the connectors of the brake control module (BCM) or the pedal pressure sensor.
Does the status change?
Yes - FAULT FOUND
No - Checking the wiring
-------------------------------------------------
Checking the wiring
Check the cables for open circuit, short-circuit to ground and short-circuit to voltage.
Measure between:
- Pedal pressure sensor terminal #1 and brake control module (BCM) terminal #27 (#A27).
- Pedal pressure sensor terminal #2 and brake control module (BCM) terminal #30 (#A30).
- Pedal pressure sensor terminal #5 and brake control module (BCM) terminal #28 (#A28).
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 pedal pressure sensor (brake booster) replacement: Power brake booster, replacing Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals
Was a malfunction detected?
Yes - Verification
No - Checking the connectors
-------------------------------------------------
Checking the connectors
- Ignition off
- Connect a breakout box to the wiring harness (not to the brake control module (BCM)).
Connect an ohmmeter between terminals #28 and #27 on the breakout box. Resistance should be infinite when the brake pedal is not activated and 0 ohms when the brake pedal is depressed.
Then connect the ohmmeter between terminals #28 and #30 on the breakout box. Resistance should be 0 ohms when the brake pedal is not activated and infinite when the brake pedal is depressed.
If resistance is incorrect, replace the brake booster.
Other information
- Connecting the breakout box, brake control module (BCM), B6324S5 Connecting the Breakout Box, Brake Control Module (BCM)
- Power brake booster, replacing Service and Repair
Was the resistance OK?
Yes - No Fault Found
No - Verification
-------------------------------------------------
Verification
Verification
Hint: After carrying out the repair, check that the malfunction has been remedied.
- Ignition off
- Reconnect the connectors, components, etc.
- Test-drive the vehicle according to Test Drive Form (DSTC (dynamic stability and traction control) /brake control module), description Test Drive Form (DSTC (Dynamic Stability and Traction Control) /Brake Control Module), Description.
Note! Do not turn off the ignition between test-driving and reading out diagnostic trouble codes. This is to obtain the correct status of the diagnostic trouble codes.
Then read out the diagnostic trouble code's status without turning off the ignition after the test-drive.
Is the status of the diagnostic trouble code intermittent?
Yes - VERIFIED
No - VERIFICATION FAILED
------------------------
VERIFIED - FAULT FOUND
VERIFICATION FAILED - Troubleshooting information
-------------------------------------------------
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
------------------------
Attempt New Test - Checking the connectors
-------------------------------------------------