C1A4A

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 communicates to the driver to be careful. The driving support ECU performs this 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 VSC warning 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 vehicle stability control system does not stored a relevant malfunction detection DTC.





INSPECTION PROCEDURE

NOTICE:
If beam axis adjustment using the Techstream is completed by pressing "Finish", it will be necessary to perform adjustment of the radar sensor assembly.

HINT
This circuit uses CAN communication. Therefore, be sure to check that the CAN communication system is normal before performing inspection How to Proceed With Troubleshooting.

PROCEDURE

1. CHECK BUZZER

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream main switch on, and turn the cruise control main switch on.

(d) Enter the following menus: Radar Cruise / Utility / Beam Axis Adjustment.

NOTICE:
Completing beam axis adjustment by pressing "Finish" will use the learning values to be reset, so be sure to cancel beam axis adjustment by pressing "Exit" immediately after the buzzer sounds.

(e) Follow the instructions on the Techstream display, and proceed to the next screen.

OK:

A buzzer will sound for 1 second.

(f) Press "Exit" to cancel beam axis adjustment.

NG -- GO TO VEHICLE STABILITY CONTROL SYSTEM Skid Control Buzzer Circuit
OK -- Continue to next step.

2. CHECK FOR DTC (PRE-COLLISION 2 SYSTEM)

(a) Using the Techstream, enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes.

(b) Clear the DTCs Pre-Collision System.

(c) Check for DTCs Pre-Collision System.

OK:

DTC C1A4A is not output.

NG -- REPLACE DRIVING SUPPORT ECU Removal

OK -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting