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 on the Techstream. Refer to DATA LIST / ACTIVE TEST [08/2012 - ] .
   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   13 

OK: Go to next step 

1. Turn the engine switch off.
2. Clear the DTCs. Refer to DTC CHECK / CLEAR [08/2012 - ] .
3. Start the engine.
4. Depress the brake pedal several times to test the stop light circuit.
5. Check if the same DTC is recorded. Refer to DTC CHECK / CLEAR [08/2012 - ] .

   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. Refer to PROBLEM SYMPTOMS TABLE [08/2012 - ] .

B → See step   14 

A → See step   16 

1. Remove the STOP SW fuse from the main body ECU RH (cowl side junction block RH).

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   STOP SW (7.5 A) fuse	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Main Body ECU RH
   *2	STOP SW Fuse

NG → REPLACE STOP SW FUSE 

OK: Go to next step 

1. Install the STOP SW fuse.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Make sure that there is no looseness at the locking part and the connecting part of the connectors.
3. Disconnect the stop light switch connector.
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A22-2 - Body ground	Always	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

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

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

NG → See step   17 

OK: Go to next step 

1. Remove the stop light control (BRK-LP) relay.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3 - 4	Voltage is not applied between terminals 1 and 2	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Stop Light Control (BRK-LP) Relay

NG → REPLACE STOP LIGHT CONTROL (BRK-LP) RELAY 

OK: Go to next step 

1. Check the stop light control relay. Refer to INSPECTION [08/2012 - ] .

   OK

   The stop light control relay is normal.

NG → See step   18 

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 stop light control relay connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A22-1 - J96-2 (STP)	Always	Below 1 Ω
   A22-1 - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Stop Light Switch)
   *2	Front view of wire harness connector (to Stop Light Control Relay)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

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	Condition	Specified Condition
   J96-8 (OUT) - Stop light control (BRK-LP) relay terminal 4	Always	Below 1 Ω
   J96-8 (OUT) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Stop Light Control Relay)
   *2	No. 3 Engine Room Relay Block
   *3	Stop Light Control (BRK-LP) Relay

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A62-22 (STP2) - Stop light control (BRK-LP) relay terminal 3	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Skid Control ECU)
   *2	No. 3 Engine Room Relay Block
   *3	Stop Light Control (BRK-LP) Relay

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Clear the DTCs. Refer to DTC CHECK / CLEAR [08/2012 - ] .
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 [08/2012 - ] .

   HINT: 

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

   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. Refer to PROBLEM SYMPTOMS TABLE [08/2012 - ] .

B → See step   14 

A → See step   15 

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 connectors.
3. Disconnect the skid control ECU connector and the stop light switch connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A62-2 (STP1) - A22-1	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Skid Control ECU)
   *2	Front view of wire harness connector (to Stop Light Switch)

   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 [08/2012 - ] .

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   14