DTC C1425: Open in Stop Light Switch Circuit [11/2016 - ]: 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  5

Result:

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 [11/2016 - ]

   Chassis > ABS/VSC/TRAC > Data List 

   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	-

   Chassis > ABS/VSC/TRAC > Data List 

   Tester Display
   Stop Light SW

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.

Result:

NG 

See step  4

Result:

OK 

Go to next step 

1. Turn the ignition switch off.
2. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [11/2016 - ]

   Chassis > ABS/VSC/TRAC > Clear DTCs 

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 [11/2016 - ]

   Chassis > ABS/VSC/TRAC > Trouble Codes 

   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 [11/2016 - ]

Result:

A 

USE SIMULATION METHOD TO CHECK. 

Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2016 - ]

Result:

B 

REPLACE BRAKE ACTUATOR ASSEMBLY. 

Refer to REMOVAL [11/2016 - ]

1. Turn the ignition switch off.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

2. Make sure that there is no looseness at the locking part and the connecting part of the connector.
3. Disconnect the A85 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
   A85-35 (STP) - Body ground	Stop light switch assembly on (Brake pedal depressed)	8 to 14 V
   A85-35 (STP) - Body ground	Stop light switch assembly off (Brake pedal released)	Below 1.5 V

   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 [11/2016 - ]

Result:

OK 

REPLACE BRAKE ACTUATOR ASSEMBLY. 

Refer to REMOVAL [11/2016 - ]

Result:

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT) 

1. Check the stop light switch assembly.

   Refer to ON-VEHICLE INSPECTION [11/2016 - ]

   OK

   The stop light switch assembly is normal.

Result:

NG 

REPLACE STOP LIGHT SWITCH ASSEMBLY. 

Refer to REMOVAL [12/2013 - ]

Result:

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

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

2. Disconnect the A85 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
   A85-35 (STP) - Body ground	Stop light switch assembly on (Brake pedal depressed)	8 to 14 V
   A85-35 (STP) - Body ground	Stop light switch assembly off (Brake pedal released)	Below 1.5 V

Result:

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT) 

Result:

OK 

Go to next step 

1. Turn the ignition switch off.
2. Reconnect the A85 skid control ECU (brake actuator assembly) connector.
3. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [11/2016 - ]

   Chassis > ABS/VSC/TRAC > Clear DTCs 

4. Turn the ignition 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 [11/2016 - ]

   Chassis > ABS/VSC/TRAC > Trouble Codes 

   HINT: 

   • If the lighting system is normal but the DTC is still output, replace the skid control ECU (brake actuator assembly).

     Refer to REMOVAL [11/2016 - ]

   • 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 [11/2016 - ]

Result:

A 

USE SIMULATION METHOD TO CHECK. 

Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2016 - ]

Result:

B 

INSPECT LIGHTING SYSTEM (STOP LIGHT CIRCUIT). 

Refer to HOW TO PROCEED WITH TROUBLESHOOTING [12/2013 - ]