Troubleshooting
Troubleshooting BCM-C110801
Checking the connectors
- Ignition off
- Check the connectors of the brake control module (BCM), pedal position sensor and brake pressure sensors for contact resistance and oxidation.
- Reinstall the components, reconnect the connectors etc.
- Ignition on
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.
Read out the diagnostic trouble code's status without turning off the ignition after the test-drive.
Other information
- Pedal sensor power brake booster, replacing Service and Repair
- Pressure sensor, master cylinder, replacing Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals
Is the status of the diagnostic trouble code intermittent?
Yes - FAULT FOUND
No - Checking the wiring and component
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Checking the wiring and component
Check the cables between pedal position sensor
- terminal #1 and brake control module (BCM) terminal #7 (#A7)
- terminal #2 and brake control module (BCM) terminal #5 (#A5)
- terminal #3 and brake control module (BCM) terminal #3 (#A3)
check for open circuit, short circuit to ground and short circuit to supply voltage.
Check the pedal position sensor
- with the ignition off
- a breakout box connected to the wiring harness
- the brake control module (BCM) disconnected
by measuring the resistance on the pedal position sensor.
When the brake pedal is not actuated, the resistance between terminals #3 (#A3) and #5 (#A5) should be approx. 0.5 kohms. The resistance should increase when the brake pedal is depressed.
When the brake pedal is not actuated, the resistance between terminals #3 (#A3) and #7 (#A7) should be approx. 2.5 kohms. The resistance should decrease when the brake pedal is depressed.
If resistance is incorrect, replace the pedal position sensor.
Remedy as necessary.
Other information
- Pedal sensor power brake booster, replacing Service and Repair
- 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)
Was a malfunction detected?
Yes - Verification
No - Checking wiring and sensors
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Checking wiring and sensors
Check the cables between the brake control module (BCM) and the brake pressure sensor connectors.
For brake pressure sensor 1:
- terminal #1 and brake control module (BCM) terminal #19 (#A19)
- terminal #2 and brake control module (BCM) terminal #20 (#A20)
- terminal #3 and brake control module (BCM) terminal #18 (#A18)
For brake pressure sensor 2:
- terminal #1 and brake control module (BCM) terminal #21 (#A21)
- terminal #2 and brake control module (BCM) terminal #23 (#A23)
- terminal #3 and brake control module (BCM) terminal #22 (#A22)
check for an open-circuit, a short-circuit to ground and a short-circuit to supply voltage.
Hint: With the breakout box and sensor connectors connected and the ignition on, check the brake pressure sensors by measuring the signal from the sensor between:
Brake pressure sensor 1:
- terminals #A19 and #A20 on the breakout box. The voltage should be approx. 0.25-4.75 V depending on brake pressure.
- terminals #A18 and #A19 on the breakout box. The voltage should be approx. 5 V.
Brake pressure sensor 2:
- terminals #A21 and #A23 on the breakout box. The voltage should be approx. 0.25-4.75 V depending on brake pressure.
- terminals #A21 and #A22 on the breakout box. The voltage should be approx. 5 V.
Remedy as necessary.
Other information
- 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)
- Pressure sensor, master cylinder, replacing Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals
Was a malfunction detected?
Yes - Verification
No - Fault-tracing 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.
- 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
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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 the connectors
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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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