DTC C1249/49: Open in Stop Light Switch Circuit [10/2015 - ]: Procedure

1. 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

Result: 

NG 

See step  4

Result: 

OK 

See step  2

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Select the Data List on the Techstream (Refer to DATA LIST / ACTIVE TEST [10/2015 - ] ).
   ABS/VSC/TRAC
   
   

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

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

   OK

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

Result: 

NG 

See step  7

Result: 

OK 

See step  3

1. Turn the power switch off.
2. Clear the DTCs (Refer to DTC CHECK / CLEAR [10/2014 - ] ).
3. Turn the power switch on (READY).
4. Depress the brake pedal several times to test the stop light circuit.
5. Check if the same DTC is output (Refer to DTC CHECK / CLEAR [10/2014 - ] ).

   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 Problem Symptoms Table, refer back to the table and proceed to the next step (Refer to PROBLEM SYMPTOMS TABLE [10/2015 - ] ).

Result: 

A 

USE SIMULATION METHOD TO CHECK 

(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ] )

Result: 

B 

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY 

(Refer to REMOVAL [10/2014 - ] )

1. Check the stop light switch assembly (Refer to ON-VEHICLE INSPECTION [10/2014 - ] ).

   OK

   The stop light switch assembly is normal.

Result: 

NG 

REPLACE STOP LIGHT SWITCH ASSEMBLY 

(Refer to REMOVAL [10/2014 - ] )

Result: 

OK 

See step  5

1. Make sure that there is no looseness at the locking part and the connecting part of the connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Disconnect the A51 skid control ECU (brake booster with master cylinder assembly) connector.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A51-33 (STP) - Body ground	Stop light switch assembly on (Brake pedal depressed)	11 to 14 V
   A51-33 (STP) - Body ground	Stop light switch assembly off (Brake pedal released)	Below 1.5 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT) 

Result: 

OK 

See step  6

1. Reconnect the A51 skid control ECU (brake booster with master cylinder assembly) connector.
2. Clear the DTCs (Refer to DTC CHECK / CLEAR [10/2014 - ] ).
3. Turn the power switch on (READY).
4. Depress the brake pedal several times to test the stop light circuit.
5. Check if the same DTC is output (Refer to DTC CHECK / CLEAR [10/2014 - ] ).

   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 Problem Symptoms Table, refer back to the table and proceed to the next step (Refer to PROBLEM SYMPTOMS TABLE [10/2015 - ] ).
   • If the lighting system is normal but the DTC is still output, replace the skid control ECU (brake booster with master cylinder assembly) (Refer to REMOVAL [10/2014 - ] ).

Result: 

A 

USE SIMULATION METHOD TO CHECK 

(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ] )

Result: 

B 

INSPECT LIGHTING SYSTEM (STOP LIGHT CIRCUIT) 

(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ] )

1. Turn the power switch off.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Make sure that there is no looseness at the locking part and the connecting part of the connector.
3. Disconnect the A51 skid control ECU (brake booster with master cylinder assembly) connector.
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A51-33 (STP) - Body ground	Stop light switch assembly on (Brake pedal depressed)	11 to 14 V
   A51-33 (STP) - Body ground	Stop light switch assembly off (Brake pedal released)	Below 1.5 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

   HINT: 

   If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step (Refer to PROBLEM SYMPTOMS TABLE [10/2015 - ] ).

Result: 

OK 

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY 

(Refer to REMOVAL [10/2014 - ] )

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT)