DTC C1425: Open in Stop Light Switch Circuit [12/2013 - ]: 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

NG → See step   4 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Select the Data List using the Techstream. Refer to DATA LIST / ACTIVE TEST [08/2013 - ] .
   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 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   8 

OK: Go to next step 

1. Turn the ignition switch off.
2. Clear the DTCs. Refer to DTC CHECK / CLEAR [08/2013 - ] .
3. Turn the ignition switch off.
4. Start the engine.
5. Depress the brake pedal several times to test the stop light circuit.
6. Check if the same DTC is output. Refer to DTC CHECK / CLEAR [08/2013 - ] .

   Result

   Result	Proceed to
   DTC C1425 is not output.	A
   DTC C1425 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 before replacing parts. Refer to PROBLEM SYMPTOMS TABLE [12/2013 - ] .

B → See step   9 

A → See step   11 

1. Check that the STOP (7.5 A) fuse is normal.

   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 stop light switch assembly connector.
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A33-2 - Body ground	Always	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Stop Light Switch Assembly)

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.

   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

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (Stop Light Switch Assembly)

NG → See step   12 

OK: Go to next step 

1. Reconnect the stop light switch assembly connector.

   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 skid control ECU connector.
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A49-30 (STP) - Body ground	Stop light switch ON (Brake pedal depressed)	11 to 14 V*
   A49-30 (STP) - Body ground	Stop light switch OFF (Brake pedal released)	Below 1.5 V

   HINT: 

   *: The standard voltage value varies depending on the +BS terminal voltage value. The standard voltage is 85% of the +BS terminal voltage.

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Skid Control ECU (Brake Actuator Assembly))

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

OK: Go to next step 

1. Reconnect the skid control ECU connector.
2. Clear the DTCs. Refer to DTC CHECK / CLEAR [08/2013 - ] .
3. Turn the ignition switch off.
4. Start the engine.
5. Depress the brake pedal several times to test the stop light circuit.
6. Check if the same DTC is output. Refer to DTC CHECK / CLEAR [08/2013 - ] .

   Result

   Result	Proceed to
   DTC C1425 is not output.	A
   DTC C1425 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 before replacing parts. Refer to PROBLEM SYMPTOMS TABLE [12/2013 - ] .

B → See step   9 

A → See step   10 

1. Turn the ignition 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 skid control ECU connector.
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A49-30 (STP) - Body ground	Stop light switch ON (Brake pedal depressed)	11 to 14 V*
   A49-30 (STP) - Body ground	Stop light switch OFF (Brake pedal released)	Below 1.5 V

   HINT: 

   *: The standard voltage value varies depending on the +BS terminal voltage value. The standard voltage is 85% of the +BS terminal voltage.

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Skid Control ECU (Brake Actuator Assembly))

   HINT: 

   If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing parts. Refer to PROBLEM SYMPTOMS TABLE [12/2013 - ] .

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

OK → See step   9