BCU Power Supply Circuit

C1A28 BCU POWER SUPPLY CIRCUIT, C1A29 BCU POWER SUPPLY CIRCUIT2

Description

The brake booster control unit controls the brake booster, etc. with the battery power supply and ignition power supply.


DTC Logic


DTC DETECTION LOGIC






NOTE:
If DTC "C1A28" or "C1A29" is detected along with DTC "U1000", first diagnose the DTC "U1000". Refer to "DTC Logic" Cruise Control.

DTC CONFIRMATION PROCEDURE


1. PERFORM DTC CONFIRMATION PROCEDURE

1.Start the engine.
2.Turn the MAIN switch of ICC system ON.
3.Perform "All DTC Reading" with CONSULT.
4.Check if the "C1A28" or "C1A29" is detected as the current malfunction in "Self Diagnostic Result" of "ICC/
ADAS".
Is "C1A28" or "C1A29" detected as the current malfunction?
YES- Refer to "Diagnosis Procedure" .
NO- Refer to "Intermittent Incident" Intermittent Incident.


Diagnosis Procedure


1. CHECK SELF-DIAGNOSIS RESULTS

Check if "U1000" is detected other than "C1A28", "C1A29" in "Self Diagnostic Result" of "ICC/ADAS".
Is "U1000" detected?
YES- Perform the CAN communication system inspection. Repair or replace the malfunctioning parts.
Refer to "DTC Logic" Cruise Control.
NO- GO TO 2.

2. CHECK BRAKE BOOSTER CONTROL UNIT POWER SUPPLY AND GROUND CIRCUIT

Check brake booster control unit power supply and ground circuit. Refer to "BRAKE BOOSTER CONTROL UNIT : Diagnosis Procedure" Brake Booster Control Unit.
Is the inspection result normal?
YES- Replace the brake booster control unit.
NO- Repair brake booster control unit power supply and ground circuit.


Special Repair Requirement


DESCRIPTION

Perform the action test after adjusting the laser beam aiming of ICC sensor integrated unit when the following operation is performed.
- Removal and installation of ICC sensor integrated unit
- Replacement of ICC sensor integrated unit

SPECIAL REPAIR REQUIREMENT


1. LASER BEAM AIMING ADJUSTMENT OF ICC SENSOR INTEGRATED UNIT

Adjust the laser beam aiming of the ICC sensor integrated unit. Refer to "LASER BEAM AIMING ADJUSTMENT : Description" Description.
- GO TO 2.

2. CHECK ICC SYSTEM

1.Erase the "Self Diagnostic Result", and then perform "All DTC Reading" again after performing the action test. (Refer to "ACTION TEST : Description" Description for action test.)
2.Check that the ICC system is normal.
- WORK END