ASCD Brake Switch

ASCD BRAKE SWITCH

Component Function Check


1. CHECK ASCD BRAKE SWITCH FUNCTION

With CONSULT
1.Turn ignition switch ON.
2.Select "BRAKE SW1" in "DATA MONITOR" mode with CONSULT.
3.Check "BRAKE SW1" indication under the following conditions.





Without CONSULT
1.Turn ignition switch ON.
2.Check the voltage between ECM harness connector terminals.





Is the inspection result normal?
YES- INSPECTION END
NO- Proceed to "Diagnosis Procedure" .


Diagnosis Procedure


1. CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect ASCD brake switch harness connector.
3.Turn ignition switch ON.
4.Check the voltage between ASCD brake switch harness connector and ground.





Is the inspection result normal?
YES- GO TO 3.
NO- GO TO 2.

2. CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect fuse block (J/B) harness connector.
3.Check the continuity between ASCD brake switch harness connector and fuse block (J/B) harness connector.





Is the inspection result normal?
YES- Perform the trouble diagnosis for power supply circuit.
Revision: March 20122013 Infiniti JX
NO- Repair or replace error-detected parts.

3. CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.Turn ignition switch OFF.
2.Disconnect ECM harness connector.
3.Check the continuity between ASCD brake switch harness connector and ECM harness connector.





4.Also check harness for short to ground and short to power.
Is the inspection result normal?
YES- GO TO 4.
NO- Repair open circuit, short to ground or short to power in harness or connectors.

4. CHECK ASCD BRAKE SWITCH

Check ASCD brake switch. Refer to "Component Inspection (ASCD Brake Switch)" .
Is the inspection result normal?
YES- Check intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
NO- Replace ASCD brake switch. Refer to "Exploded View" Exploded View.


Component Inspection (ASCD Brake Switch)


1. CHECK ASCD BRAKE SWITCH-I

1.Turn ignition switch OFF.
2.Disconnect ASCD brake switch harness connector.
3.Check the continuity between ASCD brake switch terminals under the following conditions.





Is the inspection result normal?
YES- INSPECTION END
NO- GO TO 2.

2. CHECK ASCD BRAKE SWITCH-II

1.Adjust ASCD brake switch installation. Refer to "Adjustment" Adjustments.
2.Check the continuity between ASCD brake switch terminals under the following conditions.





Is the inspection result normal?
YES- INSPECTION END
NO- Replace ASCD brake switch. Refer to "Exploded View" Exploded View.
Revision: March 20122013 Infiniti JX