Diagnosis System

1. Data of the system can be read from the Data Link Connector 3 (DLC3) of the vehicle. Therefore, when the system seems to be malfunctioning, use the Techstream to check for a malfunction and repair it.

1. The vehicle's ECM uses ISO 9141-2 communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 9141-2 format.
   Fig 1: Identifying DLC3 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard 

   DLC3 TERMINALS REFERENCE
   
   

   Tester Connection	Condition	Specified Condition
   7 (Bus + line) - 5 (Signal ground)	During communication	Pulse generation
   4 (Chassis ground) - Body ground	Always	Below 1 Ω
   5 (Signal ground) - Body ground	Always	Below 1 Ω
   16 (B+) - Body ground	Always	9 to 14 V

   HINT:

   If the screen displays a communication error message after you have connected the cable of the Techstream to the DLC3, turned the engine switch on (IG) and used the Techstream, the problem may be on the vehicle side or tester side.

   • If communication is normal when the tester is connected to another vehicle, inspect the DLC3 of the original vehicle.
   • If communication is still impossible when the tester is connected to another vehicle, the problem is probably in the tester itself, so consult the Service Department listed in the tester's instruction manual.

1. Check the battery voltage.

   Standard voltage: 

   11 to 14 V 

   If the voltage is below 11 V, replace the battery before proceeding.

HINT:

If there is a malfunction in the pulse sensor, manually operating the power window switch will cause the power window switch light to blink. The light continues to blink for 43 seconds or until the engine switch is turned off.

After 43 seconds, the power window switch light remains on.

1. Turn the engine switch on (IG).
2. Manually operate the power window master switch or power window switch at each door.
3. Check the blinking pattern of the AUTO light as shown in the illustration.
   Fig 2: Identifying Power Window Switches

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002