Diagnosis System

DESCRIPTION
1. The driver door ECU controls the function of the power mirror control system on the vehicle. Data of the power mirror control can be read in the Data Link Connector 3 (DLC3) of the vehicle.
  When the system seems to be malfunctioning, use the hand-held tester to check for malfunctions and perform repairs.

CHECK DLC3

HINT:

The vehicle's ECU uses the ISO 15765-4 communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.

Fig 1: Identifying DLC3 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

DLC3 CONNECTOR TERMINALS VOLTAGE AND RESISTANCE SPECIFICATIONS

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

HINT:

Connect the cable of the hand-held tester (with CAN VIM) to the DLC3, turn the ignition switch ON and attempt to use the hand-held tester. If the screen displays UNABLE TO CONNECT TO VEHICLE, a problem exists in the vehicle side or the tester side.

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 may be in the tester itself. Consult the Service Department listed in the tester's instruction manual.

Fig 2: Connecting Cable Of Hand-Held Tester (With CAN VIM) To DLC3

INSPECT BATTERY VOLTAGE
Standard: 11 to 14 V

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