Inspection Procedure

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

   OK : The stop light turns on/turns off normally. 

   HINT:

   The stop light uses the circuit on the terminal STP side of the hybrid vehicle control ECU.

NG : GO TO STOP LIGHT SWITCH CIRCUIT 

OK : GO TO NEXT STEP 

1. Check the DATA LIST for proper functioning of the stop light switch.

   ECM 

   DIAGNOSTIC CHART
   
   

   Item	Measurement Item / Display (Range)	Normal Condition	Diagnostic Note
   STP LIGHT SW1 M	Stop light switch signal (Main CPU)/ON or OFF	ON: Brake pedal is depressed OFF: Brake pedal is released	-
   STP LIGHT SW1 S	Stop light switch signal (Sub CPU)/ON or OFF	ON: Brake pedal is depressed OFF: Brake pedal is released	-
   STP LIGHT SW2 S	Stop light switch signal (Sub CPU)/ON or OFF	ON: Brake pedal is depressed OFF: Brake pedal is released	-

   OK : Display changes according to brake pedal operation described in above table. 

OK : REPLACE HYBRID VEHICLE CONTROL ECU 

NG : GO TO NEXT STEP 

1. Remove the stop light switch.
2. Measure the resistance of the switch.

   Standard resistance 

   STANDARD RESISTANCE CHART
   
   

   Tester Connection	Switch Condition	Specified Condition
   3 - 4	Not pushed	Below 1 Ω
   	Pushed	10 kΩ or higher

Fig 1: Inspecting Stop Light Switch Operation

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPLACE STOP LIGHT SWITCH ASSEMBLY 

OK : GO TO NEXT STEP 

1. Disconnect the S16 switch connector.
2. Measure the voltage of the wire harness side connector.

   Standard resistance 

   STANDARD RESISTANCE CHART
   
   

   Tester Connection	Specified Condition
   S16-3 - Body ground	10 to 14 V

NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

Fig 2: Measuring Voltage Of Wire Harness Side Connector (Switch - Battery)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : GO TO NEXT STEP 

1. Reconnect the S16 switch connector.
2. Disconnect the H15 ECU connector.
3. Turn the power switch ON (IG).
4. Measure the voltage of the wire harness side connector.

   Standard resistance 

   STANDARD RESISTANCE CHART
   
   

   Tester Connection	Switch Connection	Specified Condition
   STP (H15-3) - Body ground	Brake pedal is depressed	10 to 14 V
   	Brake pedal is released	Below 1 V
   ST1- (H15-2) - Body ground	Brake pedal is released	10 to 14 V
   	Brake pedal is depressed	Below 1 V

Fig 3: Checking Hybrid Vehicle Control ECU

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK : REPLACE HYBRID VEHICLE CONTROL ECU