DTC C1782/82: Stop Light Switch Circuit: Procedure

1. Check that the stop light comes on when the brake pedal is depressed and goes off when the brake pedal is released.

   OK

   Stop light switch functions normally.

NG → See step   3 

OK: Go to next step 

1. Disconnect the suspension control ECU S15 connector.
   Fig 1: Identifying Suspension Control ECU S15 Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage according to the values in the table below.

   Standard voltage

   Switch Condition	Tester Connection	Specified Condition
   Brake pedal depressed	S15-12 (STP) - Body ground	10 to 14 V
   Brake pedal released	S15-12 (STP) - Body ground	Below 1.5 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE SUSPENSION CONTROL ECU 

1. Disconnect the stop light switch assembly connector.
   Fig 2: Identifying Stop Light Switch Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage according to the values in the table below.

   Standard resistance

   Switch Condition	Tester Connection	Specified Condition
   Switch pin free	1 - 2	Below 1 Ω
   Switch pin pushed in	1 - 2	10 kΩ or higher

NG → REPLACE STOP LIGHT SWITCH ASSEMBLY 

OK: Go to next step 

1. Disconnect the suspension control ECU S15 connector.
   Fig 3: Identifying Suspension Control ECU S15 Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage according to the values in the table below.

   Standard voltage

   Switch Condition	Tester Connection	Specified Condition
   Brake pedal depressed	S15-12 (STP) - Body ground	10 to 14 V
   Brake pedal released	S15-12 (STP) - Body ground	Below 1.5 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE SUSPENSION CONTROL ECU