DTC C1425: Open in Stop Light Switch Circuit: Procedure

NG → See step   10 

OK: Go to next step 

NG → See step   4 

OK: Go to next step 

1. Clear the DTCs. Refer to DTC CHECK / CLEAR .
2. Turn the ignition switch off.
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 .
   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 suspected area. Refer to PROBLEM SYMPTOMS TABLE .

B → See step   7 

A → See step   8 

1. Make sure that there is no looseness in the locking part and connecting part of the connectors.
   Fig 1: Checking Terminal Voltage (Power Source Terminal)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the stop light switch connector.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A1-2 - Body ground	Always	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	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. Remove the stop light switch. Refer to REMOVAL .
2. Measure the resistance according to the value(s) in the table below.
   Fig 2: Inspecting Stop Light Switch

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   1 - 2	Switch pin not pushed in	Below 1 Ω
   	Switch pin pushed in	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Pin
   *a	Component without harness connected (Stop Light Switch)
   *b	Not Pushed
   *c	Pushed

NG → See step   9 

OK: Go to next step 

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   7