Inspection Procedure

1. Measure the voltage according to the value(s) in the table below.

   Standard voltage 

   VOLTAGE SPECIFICATION CHART
   
   

   Tester Connection	Condition	Specified Condition
   A22-2 - Body ground	Always	10 to 14 V
   A22-4 - Body ground	Engine switch on (IG)	10 to 14 V

Fig 1: Identifying A22 Connector From Stop Light Switch
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to Next Step 

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

   Standard resistance 

   RESISTANCE SPECIFICATION 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

   Fig 2: Inspecting Stop Light Switch

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE STOP LIGHT SWITCH 

OK: Go to Next Step 

1. Reconnect the stop light switch connector.
2. Disconnect the A5 and A6 connectors from the ECM.
3. Turn the engine switch on (IG).
4. Measure the voltage according to the value(s) in the table below.

   Standard voltage 

   VOLTAGE SPECIFICATION CHART
   
   

   Tester Connection	Brake Pedal Condition	Specified Condition
   A6-4 (STP) - Body ground	Depressed	10 to 14 V
   A6-4 (STP) - Body ground	Released	Below 1 V
   A5-8 (ST1-) - Body ground	Depressed	Below 1 V
   A5-8 (ST1-) - Body ground	Released	10 to 14 V

Fig 3: Identifying A5 And A6 Connectors From ECM
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

OK: REPLACE ECM