DCA

ICC WARNING CHIME CIRCUIT

Description
- The ICC sensor integrated unit transmits the buzzer output signal to the brake booster control unit via ITS communication.
- The brake booster control unit outputs the buzzer output signal to the ICC warning chime.
- A warning chime sounds when the system is canceled or when the vehicle distance from the vehicle ahead is too close.

Component Function Check
1.ICC WARNING CHIME OPERATION INSPECTION
1. Select the active test item "ICC BUZZER" of "ICC/ADAS" with CONSULT-III.
2. Check if the ICC warning chime sounds when operating each test item.
Does the ICC warning chime sound?
YES - The ICC warning chime circuit is normal.
NO - SEE Diagnosis Procedure.

Diagnosis Procedure
1.CHECK ICC WARNING CHIME POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect the ICC warning chime connector.
3. Turn ignition switch ON.
4. Check voltage between ICC warning chime harness connector and ground.

Is the inspection result normal?
YES - GO TO 2.
NO - Repair the harnesses or connectors.
2.CHECK ICC WARNING CHIME SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect brake booster control unit connector.
3. Check for continuity between the ICC warning chime harness connector and brake booster control unit harness connector.

Is the inspection result normal?
YES - GO TO 3.
NO - Repair the harnesses or connectors.
3.CHECK ICC WARNING CHIME SIGNAL CIRCUIT SHORT
Check for continuity between ICC warning chime harness connector and ground.

Is the inspection result normal?
YES - GO TO 4.
NO - Repair the harnesses or connectors.
4.CHECK ICC WARNING CHIME
Check the ICC warning chime. SEE Component Inspection.
Is the inspection result normal?
YES - Replace the brake booster control unit.
NO - Replace the ICC warning chime.

Component Inspection
1.ICC WARNING CHIME INSPECTION
Apply the battery voltage between ICC warning chime terminals, and then check if the ICC warning chime sounds.

Is the inspection result normal?
YES - INSPECTION END
NO - Replace the ICC warning chime.