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

1. Disconnect the stop light switch connector.
   Fig 1: Inspecting Stop Light Switch

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2. Measure the resistance according to the value(s) in the table below.

   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 → REPLACE STOP LIGHT SWITCH 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Select the Data List mode on the Techstream.
   ABS/VSC/TRAC
   
   

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

4. Check that the stop light observed on the Techstream changes when the brake pedal is depressed.

   OK

   When the brake pedal is depressed, the Techstream displays "ON".

NG → See step   4 

OK: Go to next step 

1. Disconnect the A21 ECU connector.
2. Disconnect the S62 ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   A21-25(STP) - S62-16(STOP)	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   6 

1. Disconnect the A21 ECU connector.
2. Disconnect the A35 switch connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   A21-25 (STP) - A35-1	Always	Below 1 Ω
   A21-25 (STP) - Body ground	Always	2 kΩ or lower

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 the same DTC is recorded. Refer to DTC CHECK / CLEAR .

   HINT: 

   Reinstall the sensors, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.

   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   7 

A → END