Inspection Procedure

1. Connect the intelligent tester to the DLC3.
2. Turn the engine switch on (IG), and turn the intelligent tester main switch on.
3. Check the DATA LIST for proper functioning of the stop light switch.

   ECM (Cruise control): 

   DATA LIST
   
   

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

   OK: When the brake pedal is operated, the display changes as shown above. 

OK: REPLACE ECM  (See REMOVAL )

NG: Go to Next Step 

1. Disconnect the A40 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
   
   

   Tester Connection	Condition	Specified Condition
   A40-2 - Body ground	Always	10 to 14 V
   A40-3 - Body ground	Engine switch on (IG)	10 to 14 V

Fig 1: Identifying A40 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to Next Step 

1. Remove the stop light switch. (See ON-VEHICLE INSPECTION )
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Switch Condition	Specified Condition
   1-2	Switch pin not pushed	Below 1Ω
   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
3. Install the stop light switch.

NG: REPLACE STOP LIGHT SWITCH  (See ON-VEHICLE INSPECTION )

OK: Go to Next Step 

1. Reconnect the stop light switch connector.
2. Disconnect the A10 connector 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 

   TESTER CONNECTION SPECIFIED CONDITION
   
   

   Tester Connection	Brake Pedal Condition	Specified Condition
   A10-36 (STP) - Body ground	Depressed	10 to 14 V
   A10-36 (STP) - Body ground	Released	Below 1 V
   A10-35 (ST1-) - Body ground	Depressed	Below 1 V
   A10-35(ST1-) - Body ground	Released	10 to 14 V

   Fig 3: Identifying A10 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

OK: REPLACE ECM  (See REMOVAL )