Diagnosis Procedure

ASCD BRAKE SWITCH


Description

When the brake pedal is depressed, ASCD brake switch is turned OFF and stop lamp switch is turned ON.
ECM and hybrid vehicle control ECU detects the state of the brake pedal by this input of two kinds (ON/OFF signal). Refer to System Description for the ASCD function.




ASCD BRAKE SWITCH


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.DETECT MALFUNCTIONING PART
Check the following.
- Fuse block (J/B) connector E6
- Junction block connector E46, E48
- 10A fuse (No. 3)
- Harness for open or short between ASCD brake switch and fuse
- Repair open circuit or short to ground or short to power in harness or connectors.
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 5.
NO - GO TO 4.
4.DETECT MALFUNCTIONING PART
Check the following.
- Junction block connector E45, E46
- Harness for open or short between ASCD brake switch and fuse
- Repair open circuit or short to ground or short to power in harness or connectors.
5.CHECK ASCD BRAKE SWITCH
Refer to Component Inspection (ASCD Brake Switch).
Is the inspection result normal?
YES - GO TO 6.
NO - Replace ASCD brake switch.
6.CHECK INTERMITTENT INCIDENT
Refer to Intermittent Incident.
- INSPECTION END