Pre-Collision System

PRE-COLLISION: PRE-COLLISION SYSTEM: C1A4A: Skid Control Buzzer Circuit
C1A4A - Skid Control Buzzer Circuit

DESCRIPTION

Based on pre-collision control, the driving support ECU warns the driver to be careful by sending a sounding signal to the skid control ECU to sound the skid control buzzer.

When the skid control ECU detects a malfunction in the skid control buzzer circuit, a malfunction signal is sent to the driving support ECU and a DTC is stored. Although the skid control ECU sends a malfunction signal to the driving support ECU, the relevant ABS DTCs are not stored.





INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM (SKID CONTROL BUZZER)

(a) Select the item below in the Active Test, and then check that the skid control buzzer sounds Pre-Collision System.

ABS/VSC/TRAC





OK:

Skid control buzzer sounds.

NG -- GO TO VEHICLE STABILITY CONTROL SYSTEM Problem Symptoms Table
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 C1A4A is not output.

NG -- REPLACE DRIVING SUPPORT ECU Removal

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