C1A4B

PRE-COLLISION: PRE-COLLISION SYSTEM: C1A4B: Stop Light Relay Circuit
C1A4B - Stop Light Relay Circuit

DESCRIPTION

The stop light switch outputs a brake pedal operation signal to the driving support ECU.





INSPECTION PROCEDURE

PROCEDURE

1. CHECK FOR DTC (VEHICLE STABILITY CONTROL SYSTEM)

(a) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

OK:

Vehicle stability control system DTCs are not output.

NG -- GO TO VEHICLE STABILITY CONTROL SYSTEM Vehicle Stability Control System
OK -- Continue to next step.

2. REPLACE MASTER CYLINDER SOLENOID (SKID CONTROL ECU)

(a) Replace the master cylinder solenoid Disassembly.

NEXT -- Continue to next step.

3. CHECK FOR DTC

(a) Clear the DTCs Pre-Collision System.

(b) Check for DTCs Pre-Collision System.

OK:

DTC C1A4B is not output.

NG -- REPLACE DRIVING SUPPORT ECU Removal

OK -- END (MASTER CYLINDER SOLENOID [SKID CONTROL ECU] IS DEFECTIVE)