DTC C1A4A: Skid Control Buzzer Circuit [10/2014 - 10/2015]: Procedure

PERFORM ACTIVE TEST USING TECHSTREAM (DSS SIGNAL BUZZER)

Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Turn the Techstream on.
Enter the following menus: Chassis / ABS/VSC/TRAC / Active Test / DSS Signal Buzzer.

Check that the skid control buzzer sounds.

ABS/VSC/TRAC

Tester Display	Test Part	Control Range	Diagnostic Note
DSS Signal Buzzer	Skid control buzzer	ON/OFF	-

OK

Skid control buzzer sounds.

Result:

NG

GO TO ELECTRONICALLY CONTROLLED BRAKE SYSTEM

(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2014 - 10/2015] )

Result:

OK

See step 2

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (SKID CONTROL ECU)
1. Replace the brake booster with master cylinder assembly (skid control ECU) (Refer to COMPONENTS [10/2014 - ] ).
Result:

NEXT

See step 3
CHECK DTC OUTPUT (PRE-COLLISION SYSTEM)
1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes.
5. Clear the DTCs (Refer to DTC CHECK / CLEAR [10/2014 - 10/2015] ).
6. Recheck for DTCs.
  OK
  
  DTC C1A4A is not output.
Result:

OK

END (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (SKID CONTROL ECU) WAS DEFECTIVE)

Result:

NG

REPLACE DRIVING SUPPORT ECU ASSEMBLY

(Refer to COMPONENTS [10/2014 - 10/2015] )