Inspection Procedure

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

1. NG: Go to step   3 
2. OK: Go To Next Step 

1. Remove the suspension control ECU with connectors being connected.
2. Measure voltage between terminal S19-12 (STP) and S20-1 (GND) of the suspension control ECU when stop lamp switch assy switch is ON and OFF.

Fig 1: Measuring Voltage Between Terminals S19-12 & S20-1

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard: 

HINT:

NG:

Repair or replace the harness or the connector between the stop lamp switch assy and the suspension control ECU.

1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
2. OK: CHECK AND REPLACE SUSPENSION CONTROL ECU (See  ELECTRONIC CIRCUIT INSPECTION PROCEDURE  ) 

1. Disconnect the stop lamp switch assy connector.
2. Check continuity between terminal 1 and 2 of the stop lamp switch assy.
   Fig 2: Checking Continuity Between Terminals 1 & 2

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard: 

   SWITCH CONDITION SPECIFICATION
   
   

   Switch condition	Tester connection	Specification
   Switch pin free	1-2	No continuity
   Switch pin pushed in	1-2	Continuity

1. NG: REPLACE STOP LAMP SWITCH ASSY 
2. OK: Go To Next Step 

1. Remove the suspension control ECU with connectors being connected.
2. Measure voltage between terminal S19-12 (STP) and S20-1 (GND) of the suspension control ECU when stop lamp switch assy switch pin is free and pushed in.
   Fig 3: Measuring Voltage Between Terminals S19-12 & S20-1

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard: 

   SWITCH CONDITION VOLTAGE
   
   

   Switch condition	Voltage
   Switch pin free	10 to 14 V
   Switch pin pushed in	Below 1.5 V

HINT:

NG:

Repair or replace the harness or the connector between the STOP fuse and the suspension control ECU.

1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
2. OK: CHECK AND REPLACE SUSPENSION CONTROL ECU (See  ELECTRONIC CIRCUIT INSPECTION PROCEDURE  )