Diagnosis Procedure

ICC BRAKE SWITCH


Description

When the brake pedal is depressed, ICC 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). Refer to System Description for the ICC function.




ICC BRAKE SWITCH


Diagnosis Procedure

1.CHECK DTC WITH ICC SENSOR INTEGRATED UNIT
Refer to ICC (Full Speed Range).
Are any DTCs detected?
YES - Perform the Diagnosis Procedure corresponding to the detected DTC.
NO - GO TO 2.
2.CHECK OVERALL FUNCTION
With CONSULT-III
1. Turn ignition switch ON.
2. Select "BRAKE SW1" in "DATA MONITOR" mode with CONSULT-III.
3. Check "BRAKE SW1" indication under the following conditions.





Without CONSULT-III
1. Turn ignition switch ON.
2. Check the voltage between ECM harness connector terminals under the following conditions.





Is the inspection result normal?
YES - INSPECTION END
NO - GO TO 3.
3.CHECK ICC BRAKE SWITCH POWER SUPPLY CIRCUIT-I
1. Turn ignition switch OFF.
2. Disconnect ICC brake switch harness connector.
3. Turn ignition switch ON.
4. Check the voltage between ICC brake switch harness connector and ground.





Is the inspection result normal?
YES - GO TO 10.
NO - GO TO 4.
4.CHECK ICC BRAKE SWITCH POWER SUPPLY CIRCUIT-II
1. Turn ignition switch OFF.
2. Disconnect ICC brake hold relay.
3. Turn ignition switch ON.
4. Check the voltage between ICC brake hold relay harness connector and ground.





Is the inspection result normal?
YES - GO TO 6.
NO - GO TO 5.
5.DETECT MALFUNCTIONING PART
Check the following.
- Fuse block (J/B) connector E103
- 10 A fuse (No. 3)
- Harness for open or short between ICC brake hold relay and fuse
- Repair open circuit or short to ground in harness or connectors.
6.CHECK ICC BRAKE SWITCH POWER SUPPLY CIRCUIT-III
1. Turn ignition switch OFF.
2. Check the continuity between ICC brake switch harness connector and ICC brake hold relay harness connector.





3. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES - GO TO 7.
NO - Repair open circuit, short to ground or short to power in harness or connectors.
7.CHECK ICC BRAKE HOLD RELAY CONTROL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect brake booster control unit harness connector.
3. Check the continuity between ICC brake hold relay harness connector and brake booster control unit harness connector.





4. Check the continuity between ICC brake hold relay harness connector and ground.





5. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES - GO TO 9.
NO - GO TO 8.
8.DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E106, M6
- Harness connectors M117, B201
- Harness for open or short between ICC brake hold relay and brake booster control unit
- Harness for open or short between ICC brake hold relay and ground
- Repair open circuit, short to ground or short to power in harness or connectors.
9.CHECK ICC BRAKE HOLD RELAY
Refer to ICC Brake Switch.
Is the inspection result normal?
YES - GO TO 13.
NO - Replace ICC brake hold relay.
10.CHECK ICC BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between ICC 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 12.
NO - GO TO 11.
11.DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors E106, M6
- Harness for open or short between ICC brake switch and ECM
- Repair open circuit, short to ground or short to power in harness or connectors.
12.CHECK ICC BRAKE SWITCH
Refer to Component Inspection (ICC Brake Switch).
Is the inspection result normal?
YES - GO TO 13.
NO - Replace ICC brake switch.
13.CHECK INTERMITTENT INCIDENT
Refer to Intermittent Incident.
- INSPECTION END