DTC C1A4B: Stop Light Relay Circuit: Procedure

1. Check DTC for electronically controlled brake system. Refer to DTC CHECK / CLEAR .

   OK

   Electronically controlled brake system DTC is not output.

NG → See step   5 

OK: Go to next step 

1. Replace the brake booster with master cylinder (skid control ECU). Refer to REMOVAL .

NEXT: Go to next step 

1. Using the Techstream, enter the following menus: Body Electrical / Pre-Collision 2 / Trouble Codes.
2. Clear the DTCs. Refer to DTC CHECK / CLEAR .
3. Check for DTCs.

   OK

   DTC C1A4B is not output.

NG → See step   4 

OK → END (BRAKE BOOSTER WITH MASTER CYLINDER WAS DEFECTIVE)