Inspection Procedure

1. Check whether the stop lights turn on and off normally when the brake pedal is depressed and released.

   OK: Stop lights turn ON when brake pedal is depressed. 

NG: REPAIR OR REPLACE STOP LIGHT SWITCH CIRCUIT 

OK: Go to Next Step 

1. Connect the intelligent tester to the DLC3.
2. Turn the ignition switch ON and turn the tester ON.
3. On the tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / STOP LIGHT SW.
4. Read the value displayed on the tester.

   Standard 

   BRAKE PEDAL OPERATION - SPECIFIED CONDITIONS
   
   

   Brake Pedal Operation	Specified Condition
   Depressed	STP Signal ON
   Released	STP Signal OFF

OK: CHECK FOR INTERMITTENT PROBLEMS 

NG: Go to Next Step 

1. Check the resistance when the stop light switch is ON and OFF.

   Standard resistance 

   TESTER CONNECTION - SPECIFIED CONDITIONS
   
   

   Switch Position	Tester Connection	Specified Condition
   ON (Free)	1 - 2	Below 1 Ω
   OFF (Pushed in)	1 - 2	10 kΩ or higher

NG: REPLACE STOP LIGHT SWITCH ASSEMBLY 

Fig 1: Connecting Intelligent Tester To DLC3

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to Next Step 

1. Disconnect the S8 stop light switch connector.
   Fig 2: Disconnecting S8 Stop Light Switch Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the E4 ECM connector.
3. Measure the resistance of the wire harness side connector.

   Standard resistance (Check for open) 

   TESTER CONNECTION - SPECIFIED CONDITIONS
   
   

   Tester Connection	Specified Condition
   S8-1 - STP (E4-4)	Below 1 Ω

   Standard resistance (Check for short) 

   TESTER CONNECTION - SPECIFIED CONDITIONS
   
   

   Tester Connection	Specified Condition
   S8-1 or STP (E4-4) - Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 3: Measuring Resistance Of Wire Harness Side Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPLACE ECM