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

1. Remove the STOP fuse from the main body ECU (instrument panel junction block).
   Fig 1: Identifying STOP Fuse

   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 (10 A) fuse	Always	Below 1 Ω

NG → REPLACE STOP FUSE 

OK: Go to next step 

1. Install the STOP fuse.
2. Check that the stop lights come on when the brake pedal is depressed, and go off when the brake pedal is released.

   OK

   Condition	Illumination Condition
   Brake pedal depressed	ON
   Brake pedal released	OFF

NG → See step   7 

OK: Go to next step 

1. Disconnect the skid control ECU connector.
   Fig 2: Identifying Skid Control ECU Connector Terminals

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   A51-28 (STP) - Body ground	Stop light switch ON (Brake pedal depressed)	8 to 14 V
   A51-28 (STP) - Body ground	Stop light switch OFF (Brake pedal released)	Below 1.5 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT) 

OK: Go to next step 

1. Turn the ignition switch to ON.
   Fig 3: Identifying Skid Control ECU Connector Terminals (IG1)

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   A51-34 (IG1) - Body ground	Ignition switch ON	11 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT) 

OK: Go to next step 

1. Turn the ignition switch off.
   Fig 4: Identifying Skid Control ECU Connector Terminals (GND1)

   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
   A51-1 (GND1) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (GND1 CIRCUIT) 

OK: Go to next step 

1. Reconnect the skid control ECU connector.
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 recorded. Refer to DTC CHECK / CLEAR .

   Result

   Result	Proceed to
   DTC (C1249/49) is not output	A
   DTC (C1249/49) 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 → See step   13 

A → See step   11 

1. Disconnect the stop light switch connector.
   Fig 5: Identifying Stop Light Switch Connector Terminals

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A1-2 - Body ground	Always	11 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 6: Inspecting Stop Light Switch

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

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

NG → See step   14 

OK: Go to next step 

1. Disconnect the skid control ECU connector.
   Fig 7: Identifying Skid Control ECU And Stop Light Switch Connector Terminals

   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
   A51-28 (STP) - A1-1	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Reconnect the skid control ECU connector and the stop light switch connector.
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 recorded. Refer to DTC CHECK / CLEAR .

   Result

   Result	Proceed to
   DTC (C1249/49) is not output	A
   DTC (C1249/49) 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 → See step   13 

A → See step   12