Check Mode Procedure

LIST OF OPERATION METHODS
By operating each of the A/C control switches as shown in the diagram below, it is possible to enter the diagnostic check mode.

Fig 1: A/C Control Switches Operating Diagram
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

CHECK DLC3

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

HINT:

Connect the cable of the intelligent tester to the DLC3, turn the engine switch on (IG) and attempt to use the tester. If the display indicates that a communication error has occurred, there is a problem either with the vehicle or with the tester.

If communication is normal when the tester is connected to another vehicle, inspect the DLC3 of the original vehicle.

If communication is still not possible 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: Identifying DLC3 Connector Terminal

DLC3 TERMINAL REFERENCE

Symbol (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)	HIGH-level CAN bus line	Engine switch off	54 to 69 Ω
CANH (6) - Battery positive	HIGH-level CAN bus line	Engine switch off	1 MΩ or higher
CANH (6) - CG (4)	HIGH-level CAN bus line	Engine switch off	3 MΩ or higher
CANL (14) - Battery positive	LOW-level CAN bus line	Engine switch off	1 MΩ or higher
CANL (14) - CG (4)	LOW-level CAN bus line	Engine switch off	3 MΩ or higher