DTC C1426: Stop Light Switch OFF Stuck Malfunction [08/2015 - 08/2019]: 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. Turn the ignition switch off.
2. Connect the Techstream to the DLC3.
3. Turn the ignition switch to ON.
4. Turn the Techstream on.
5. Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.
   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	-
   Brake Pedal Load Sensing SW	Brake pedal load sensing switch/ ON or OFF	ON: Brake pedal depressed beyond specified point OFF: Brake pedal not depressed beyond specified point	-

6. Check that the stop light switch display and brake pedal load sensing switch display observed on the Techstream change according to the brake pedal operation.

   OK

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

7. Slowly depress the brake pedal and check when the stop light switch and brake pedal load sensing switch are turned on.

   OK

   The stop light switch turns on first, and then the brake pedal load sensing switch turns on.

   RESULT
   
   

   Result	Proceed to
   OK	A
   NG (Turning on of stop light switch is not confirmed)	B
   NG (Brake pedal load sensing switch turns on first)	C

Result: 

B 

See step  5

Result: 

C 

See step  7

Result: 

A 

See step  3

1. Turn the ignition switch off.
2. Clear the DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).
3. Start the engine.
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 [08/2015 - 08/2019] ).
   RESULT
   
   

   Result	Proceed to
   DTC C1426 is not output	A
   DTC C1426 is output	B

Result: 

A 

REPLACE BRAKE ACTUATOR ASSEMBLY 

(Refer to REMOVAL [08/2015 - 08/2019] )

Result: 

B 

USE SIMULATION METHOD TO CHECK 

(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2015 - 08/2019] )

See step  4

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

Result: 

OK 

See step  5

See step  5

Result: 

OK 

REPLACE BRAKE ACTUATOR ASSEMBLY 

(Refer to REMOVAL [08/2015 - 08/2019] )

Result: 

NG 

See step  6

See step  6

Result: 

OK 

REPLACE STOP LIGHT SWITCH ASSEMBLY 

(Refer to REMOVAL [08/2015 - ] )

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Adjust the brake pedal height and stop light switch assembly installation (Refer to ADJUSTMENT [08/2015 - ] ).

Result: 

NEXT 

See step  8

1. Clear the DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).
2. Start the engine.
3. Depress the brake pedal several times to test the stop light circuit.
4. Check if the same DTC is output (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).
   RESULT
   
   

   Result	Proceed to
   DTC C1426 is not output	A
   DTC C1426 is output	B

Result: 

A 

END 

Result: 

B 

REPLACE BRAKE WITH SWITCH PEDAL SUB-ASSEMBLY 

(Refer to REMOVAL [08/2015 - ] )