DTC C1249/49: Stop Light Switch Circuit: Wiring Diagram

For wiring diagram of stop light switch circuit, see Fig 1.

For complete ABS System Wiring Diagrams, see ANTI-LOCK BRAKES in SYSTEM WIRING DIAGRAMS article.

Fig 1: Stop Light Switch Circuit Wiring Diagram

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Check Operation Of The Stop Light Switch. 

   Check  : That the stop lights light up when brake pedal is depressed and turn OFF when the brake pedal is released.

   1. NG: LOCATION .
   2. OK  : Go to next step.
2. Check Voltage Between Terminal STP Of Skid Control ECU And Body Ground. 

   Preparation  : Disconnect skid control ECU connector.

   Check  : Measure voltage between terminal STP (23) of skid control ECU harness side connector and body ground when the brake pedal is depressed. See Fig 2.

   OK  : Voltage: 8-14 V

   NOTE: When replacing the ECU, perform the zero point calibration. See step  6 under PRE-CHECK.
   1. OK  : Check and replace skid control ECU.
   2. NG  : Go to next step.
   Fig 2: Locating Skid Control ECU Harness Side Connector Terminal 23

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Check for open circuit in harness and connector between skid control ECU and stop light switch. See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE .
   1. NG  : Repair or replace harness or connector.
   2. OK  : Proceed to next circuit inspection shown on problem symptoms table. See PROBLEM SYMPTOMS  table.