Lane-Keeping Assist System

CRUISE CONTROL: LANE-KEEPING ASSIST SYSTEM: C1A4A: Skid Control Buzzer Circuit
C1A4A - Skid Control Buzzer Circuit

DESCRIPTION

If the vehicle is about to move out of the lane markers while the lane-keeping assist function is operating, the driving support ECU sends a sounding signal to the brake booster with master cylinder (skid control ECU) to sound the skid control buzzer in order to warn the driver.





INSPECTION PROCEDURE

PROCEDURE

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

(a) Using the Techstream, enter the following menus: Chassis / ABS/VSC/TRAC / Active Test / Buzzer.

(b) Perform Active Test.

ABS/VSC/TRAC





OK:

Skid control buzzer sounds.

NG -- GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM Electronically Controlled Brake System
OK -- Continue to next step.

2. REPLACE BRAKE BOOSTER WITH MASTER CYLINDER

(a) Replace the brake booster with master cylinder (skid control ECU) Removal.

NEXT -- Continue to next step.

3. CHECK DTC OUTPUT

(a) Using the Techstream, enter the following menus: All ECUs / Lane Keeping Assist / Trouble Codes.

(b) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(c) Turn the power switch off.

(d) Turn the power switch on (IG).

(e) Drive the vehicle at a speed of 50 km/h (31 mph) or more, and operate lane keeping assist control.

(f) Recheck for DTCs.

OK:

DTC C1A4A is not output.

NG -- REPLACE DRIVING SUPPORT ECU Removal

OK -- END