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 detects the state of the brake pedal by those two types of input (ON/OFF signal). 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 E102
- 10 A fuse (No. 12)
- Harness for open or short between ASCD brake switch and fuse
- Repair open circuit, 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.
- Harness connectors E108, M15
- Harness for open or short between ECM and ASCD brake switch
- Repair open circuit, short to ground or short to power in harness or connectors.
5.CHECK ASCD BRAKE SWITCH
Component Inspection
Is the inspection result normal?
YES - GO TO 6.
NO - Replace ASCD brake switch.
6.CHECK INTERMITTENT INCIDENT
Description.
- INSPECTION END