C1A05

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS


C1A05 BRAKE SW/STOP L SW

1.PERFORM ICC SENSOR INTEGRATED UNIT SELF-DIAGNOSIS
1. Perform self-diagnosis.
2. Check if "U1000: CAN COMM CIRCUIT" (DTC 100) other than "C1A05: BRAKE SW/STOP L SW" (DTC
5) is indicated in self-diagnosis item in the display.
Is it indicated?
YES - 1. CAN communication inspection. Refer to ICC.
2. After repairing or replacing applicable item, erase DTC and perform ICC system running test.
Then perform self-diagnosis of ICC system again.
NO - GO TO 2.
2.CHECK ICC BRAKE SWITCH WITH ICC DATA MONITOR
With CONSULT-III
With "ICC" "Data Monitor", check if "BRAKE SW" operates normally.
OK or NG
OK - GO TO 3.
NG - GO TO 6.
3.CHECK STOP LAMP SWITCH WITH ABS DATA MONITOR
With CONSULT-III
With "ABS" "Data Monitor", check if "STOP LAMP SW" operates normally.
OK or NG
OK - GO TO 4.
NG - GO TO 11.
4.PERFORM ECM SELF-DIAGNOSIS
With CONSULT-III
1. Perform "ENGINE" self-diagnosis. Refer to Testing and Inspection (for VQ35HR) or , "CONSULT-III Function" (for VK45DE).
2. Check if malfunction is indicated.
Is malfunction indicated?
YES - 1. Repair or replace applicable item.
2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system again.
NO - GO TO 5.
5.PERFORM ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) SELF-DIAGNOSIS
With CONSULT-III
1. Perform "ABS" self-diagnosis. Refer to Scan Tool Testing and Procedures.
2. Check if malfunction is indicated.
Is malfunction indicated?
YES - 1. Repair or replace applicable item.
2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system again.
NO - 1. Replace ICC sensor integrated unit, and adjust laser beam aiming.
2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system again.
6.CHECK ICC BRAKE SWITCH INSTALLATION AND ADJUSTMENT
Check ICC brake switch for proper installation, and adjust the switch if necessary. Refer to Procedures Removal and Replacement.
OK or NG
OK - GO TO 7.
NG - 1. Adjust ICC brake switch.
2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system again.
7.CHECK ICC BRAKE SWITCH
Check ICC brake switch. Refer to ICC Brake Switch and Stop Lamp Switch.
OK or NG
OK - GO TO 8.
NG - 1. Replace ICC brake switch.
2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system again.
8.CHECK ICC BRAKE SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ICC brake switch connector.
3. Turn ignition switch ON.





4. Check voltage between ICC brake switch harness connector and ground.





OK or NG
OK - GO TO 9.
NG - 1. Repair or replace harness or fuse.
2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system again.
CHECK HARNESS BETWEEN ICC BRAKE SWITCH AND ECM
1. Turn ignition switch OFF.
2. Disconnect ECM connector.





3. Check continuity between ICC brake switch harness connector
(A) and ECM harness connector (B).















4. Check continuity between ICC brake switch harness connector
(A) and ground.






OK or NG
OK - GO TO 10.
NG - 1. Repair or replace harness between ICC brake switch and ECM.
2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system again.
10.PERFORM ECM SELF-DIAGNOSIS
With CONSULT-III
1. Perform "ENGINE" self-diagnosis. Refer to Testing and Inspection (for VQ35HR) or , "CONSULT-III Function" (for VK45DE).
2. Check if malfunction is indicated.
Is malfunction indicated?
YES - 1. Repair or replace applicable item.
2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system again.
NO - 1. Replace ICC sensor integrated unit, and adjust laser beam aiming.
2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system again.
11.CHECK STOP LAMP SWITCH INSTALLATION AND ADJUSTMENT
Check stop lamp switch for proper installation, and adjust the switch if necessary. Refer to Procedures Removal and Replacement.
OK or NG
OK - GO TO 12.
NG - 1. Adjust stop lamp switch.
2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system again.
12.CHECK STOP LAMP SWITCH
Check stop lamp switch. Refer to ICC Brake Switch and Stop Lamp Switch.
OK or NG
OK - GO TO 13.
NG - 1. Replace stop lamp switch.
2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system again.
13.CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect stop lamp switch connector.
3. Turn ignition switch ON.





4. Check voltage between stop lamp switch harness connector and ground.





OK or NG
OK - GO TO 14.
NG - 1. Repair or replace harness or fuse.
2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system again.
14.CHECK HARNESS BETWEEN STOP LAMP SWITCH AND ABS ACTUATOR AND ELECTRIC UNIT
(CONTROL UNIT)
1. Turn ignition switch OFF.
2. Disconnect ABS actuator and electric unit (control unit) connector.





3. Check continuity between stop lamp switch harness connector
(A) and ABS actuator and electric unit (control unit) harness connector (B).





4. Check continuity between stop lamp switch harness connector
(A) and ground.





OK or NG
OK - 1. Perform "ABS" self-diagnosis. Refer to Scan Tool Testing and Procedures.
2. After repairing or replacing applicable item, erase DTC and perform ICC system running test.
Then perform self-diagnosis of ICC system again.
NG - 1. Repair or replace harness between stop lamp switch and ABS actuator and electric unit (control unit).
2. Erase DTC and perform ICC system running test. Then perform self-diagnosis of ICC system again.