Inspection Procedure

1. Disconnect the A1 connector from the stop light switch.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   A1-2 - Body ground	Always	11 to 14 V
   A1-3 - Body ground	Ignition switch ON	11 to 14 V

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 1: Identifying Terminals Of A1 Stop Light Switch Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : Go to next step 

1. Remove the stop light switch (See STOP LIGHT SWITCH ).
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Switch Condition	Specified Condition
   1-2	Switch pin not pushed	Below 1 Ω
   3-4	Switch pin not pushed	10 kΩ or higher
   1-2	Switch pin pushed	10 kΩ or higher
   3-4	Switch pin pushed	Below 1 Ω

3. Install the stop light switch (See INSPECTION ).

NG : REPLACE STOP LIGHT SWITCH  (See STOP LIGHT SWITCH )

Fig 2: Identifying Terminals Of Stop Light Switch Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : Go to next step 

1. Reconnect the stop light switch connector.
2. Disconnect the A50 connector from the ECM.
3. Turn the ignition switch to ON.
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection	Condition	Specified Condition
   A50-36 (STP) - Body ground	Brake pedal depressed	11 to 14 V
   A50-36 (STP) - Body ground	Brake pedal released	Below 1 V
   A50-35 (ST1-) - Body ground	Brake pedal depressed	Below 1 V
   A50-35 (ST1-) - Body ground	Brake pedal released	11 to 14 V

   Fig 3: Identifying Terminals Of A50 ECM Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Result 

   RESULT REFERENCE
   
   

   Result	Proceed to
   NG	A
   OK (for 2ZR-FE)	B
   OK (for 2AZ-FE)	C

B : REPLACE ECM (for 2ZR-FE)  (See ECM )

C : REPLACE ECM (for 2AZ-FE)  (See ECM )

A : REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH - ECM)