BCM Inspection

BCM Inspection

1. Check input signal
1. Ignition "ON" and engine "OFF"
2. Connect scantool and select INPUT/OUTPUT MONITORING.
3. Monitor "BRAKE SWITCH" parameter on the scantool.
A. Specification : "ON" when brake pedal is depressed.




4. Is parameter displayed within specifications?
YES
1) Go to "Check output signal" as below
NO
1) Check for a brake switch and harness. Repair as necessary and then go to "Verification of Vehicle Repair"
2. Check output signal
1. Ignition "ON" and engine "OFF"
2. Connect scantool and select ACTUATION test mode.
3. Perform "BRAKE LAMP MALFUNCTION INDICATOR"
A. Specification : 1 sec "ON" and 1 sec "OFF" 5 times.




4. Is brake lamp malfunction indicator displayed according to specification?
YES
1) Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration or damage.
Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
NO
1) Substitute with a known-good BCM and check proper operation.
If the problem is corrected, replace BCM and then go to "Verification of Vehicle Repair" procedure.