DTC C1425: Open in Stop Light Switch Circuit: 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 engine switch on (IG).
3. Select the Data List using the Techstream. Refer to DATA LIST / ACTIVE TEST [06/2012 - ] .
   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 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 engine switch off.
2. Clear the DTCs. Refer to DTC CHECK / CLEAR [06/2012 - ] .
3. Turn the engine 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 [06/2012 - ] .

   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 [06/2012 - ] .

B → See step   9 

A → See step   11 

1. Inspect the stop light switch assembly. Refer to ON-VEHICLE INSPECTION [06/2012 - ] .

   OK

   The stop light switch assembly is normal.

NG → See step   12 

OK: Go to next step 

1. Disconnect the 1F No. 1 integration relay (engine room junction block assembly) connector.

   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
   1F-16 (STPS) - Body ground	Stop light switch assembly ON (Brake pedal depressed)	11 to 14 V
   1F-16 (STPS) - 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 No. 1 Integration Relay (Engine Room Junction Block Assembly))

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

OK: Go to next step 

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 A40 skid control ECU (brake actuator assembly) connector.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A40-2 (STP) - Body ground	Stop light switch ON (Brake pedal depressed)	11 to 14 V
   A40-2 (STP) - Body ground	Stop light switch OFF (Brake pedal released)	Below 1.5 V

   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 1F No. 1 integration relay (engine room junction block assembly) connector.
2. Reconnect the A40 skid control ECU (brake actuator assembly) connector.
3. Clear the DTCs. Refer to DTC CHECK / CLEAR [06/2012 - ] .
4. Turn the engine switch off.
5. Start the engine.
6. Depress the brake pedal several times to test the stop light circuit.
7. Check if the same DTC is output. Refer to DTC CHECK / CLEAR [06/2012 - ] .

   Result

   Result	Proceed to
   DTC C1425 is not output.	A
   DTC C1425 is output.	B

   HINT: 

   • If the lighting system is normal but the DTC is still output, replace the skid control ECU (brake actuator assembly). Refer to REMOVAL [06/2012 - ] .
   • 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 [06/2012 - ] .

B → See step   10 

A → See step   11 

1. Turn the engine 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 A40 skid control ECU (brake actuator assembly) connector.
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A40-2 (STP) - Body ground	Stop light switch ON (Brake pedal depressed)	11 to 14 V
   A40-2 (STP) - Body ground	Stop light switch OFF (Brake pedal released)	Below 1.5 V

   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 [06/2012 - ] .

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

OK → See step   9