DTC C1249/49: Open in Stop Light Switch Circuit: Procedure

1. Remove the STOP No. 1 and STOP No. 2 fuses from the engine room relay block.
   Fig 1: Inspecting STOP No. 1 And STOP No. 2 Fuses

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   STOP No. 1 fuse	Always	Below 1 Ω
   STOP No. 2fuse	Always	Below 1 Ω

NG → REPLACE STOP FUSE 

OK: Go to next step 

1. Install the STOP No. 1 and STOP No. 2 fuses.
2. Check that the stop light comes on when the brake pedal is depressed, and goes off when the brake pedal is released.

   OK

   Condition	Illumination Condition
   Brake pedal depressed	ON
   Brake pedal released	OFF

NG → See step   5 

OK: Go to next step 

1. Turn the ignition switch off.
2. Connect the Techstream to the DLC3.
3. Turn the ignition switch on (IG).
4. Select the Data List on the Techstream. Refer to DATA LIST / ACTIVE TEST .

   ABS/VSC/TRAC

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Stop Light Switch	Stop light switch / ON or OFF	ON: Brake pedal depressed OFF: Brake pedal released	-

5. Check the stop light switch display observed on the Techstream changes according to brake pedal operation.

   OK

   The Techstream displays ON or OFF according to brake pedal operation.

NG → See step   9 

OK: Go to next step 

1. Turn the ignition switch off.
2. Clear the DTCs. Refer to DTC CHECK / CLEAR .
3. Start the engine.
4. Depress the brake pedal several times to test the stop light circuit.
5. Check if the same DTC is detected. Refer to DTC CHECK / CLEAR .

   Result

   Result	Proceed to
   DTC is not output	A
   DTC is output	B

   HINT: 

   If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step. Refer to PROBLEM SYMPTOMS TABLE .

B → REPLACE ABS & TRACTION ACTUATOR ASSEMBLY 

A → See step   11 

1. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
2. Disconnect the stop light switch connector.
   Fig 2: Identifying Stop Light Switch Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the voltage according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Condition	Specified Condition
   A23-2 - Body ground	Always	10 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

OK: Go to next step 

1. Measure the resistance according to the value(s) in the table below.
   Fig 3: Inspecting Stop Light Switch Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance

   Switch Condition	Tester Connection	Specified Condition
   Switch pin free	1 - 2	Below 1 Ω
   Switch pin pushed in	1 - 2	10 kΩ or higher

NG → REPLACE STOP LIGHT SWITCH ASSEMBLY 

OK: Go to next step 

1. Install the stop light switch connector.
2. Turn the ignition switch ON (IG).
3. Disconnect the skid control ECU connector.
4. Measure the voltage according to the value(s) in the table below.
   Fig 4: Inspecting Skid Control ECU (STP1 Terminal)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage

   Tester Connection	Condition	Specified Condition
   A34-27 (STP1) - Body ground	Stop light switch ON (Brake pedal depressed)	8 to 14 V
   A34-27 (STP1) - Body ground	Stop light switch OFF (Brake pedal released)	Below 1.5 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (STP1 TERMINAL) 

OK: Go to next step 

1. Turn the ignition switch off.
   Fig 5: Inspecting Skid Control ECU (GND Terminal)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Connection	Specified Condition
   A34-32 (GND1) - Body ground	Always	Below 1 Ω
   A34-1 (GND2) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (GND TERMINAL) 

OK: Go to next step 

1. Turn the ignition switch off.
2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
   Fig 6: Identifying Stop Light Switch And Skid Control ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Disconnect the stop light switch connector and skid control ECU connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Connection	Specified Condition
   A34-27 (STP1) - A23-1 (STP)	Always	Below 1 Ω
   A34-27 (STP1) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Clear the DTC. Refer to DTC CHECK / CLEAR .
2. Start the engine.
3. Depress the brake pedal several times to test the stop light circuit.
4. Check if same DTC is detected. Refer to DTC CHECK / CLEAR .

   Result

   Result	Proceed to
   DTC is not output	A
   DTC is output	B

   HINT: 

   If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step. Refer to PROBLEM SYMPTOMS TABLE .

B → REPLACE ABS & TRACTION ACTUATOR ASSEMBLY 

A → INSPECT LIGHTING SYSTEM (STOP LIGHT CIRCUIT)