Diagnosis System

Power door lock control system data can be read through the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning, use the intelligent tester to check for malfunctions and perform repairs.

1. The vehicle's ECU uses ISO 9141-2 for communication.

   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
   TERMINAL DESCRIPTION SPECIFIED CONDITION REFERENCE TABLE
   
   

   Symbols (Terminal No.)	Terminal Description	Condition	Specified Condition
   SIL (7) - SG (5)	Bus "+" line	During transmission	Pulse generation
   CG (4) - Body ground	Chassis ground	Always	Below 1 Ω
   SG (5) - Body ground	Signal ground	Always	Below 1 Ω
   BAT (16) - Body ground	Battery positive	Always	11 to 14 V
   CANH (6) - CANL (14)	CAN bus line	Ignition switch OFF	54 to 69 Ω
   CANH (6) - Battery positive	HIGH-level CAN bus line	Ignition switch OFF	6 kΩ or higher
   CANH (6) - CG (4)	HIGH-level CAN bus line	Ignition switch OFF	200 Ω or higher
   CANL (14) - Battery positive	LOW-level CAN bus line	Ignition switch OFF	6 kΩ or higher
   CANL (14) - CG (4)	LOW-level CAN bus line	Ignition switch OFF	200 Ω or higher

   HINT:

   If the display shows a communication error message after connecting the intelligent tester to the DLC3 and turning the ignition switch to the ON position, there is a problem with either the vehicle or the intelligent tester.

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