Data Link Connector: Description and Operation

NOTICE: Never make a mistake with the terminal connection position as this will cause a malfunction.

DATA LINK CONNECTOR 1 (DLC1)



The DLC1 inside the engine compartment is used for engine adjustment.


DATA LINK CONNECTOR 2 (DLC2)



The DLC2 is provided inside the cabin (located under the left side instrument panel) as a connector exclusively for diagnosis of data from the engine, automatic transmission, ABS, A/C, Airbag. Air Suspension, Traction Control and Cruise Control System to improve serviceability.







Connecting the terminals of the DLC2 to terminal E1 selects the diagnosis mode shown in the following table.

By connecting the DLC2 up to a monitor specifically designed for use with the DLC2, the diagnosis result for each system can be read easily.


DATA LINK CONNECTOR (DLC3)

DLC3 Terminals:

The vehicle's ECM uses V.P.W. (Variable Pulse Width) for communication to comply with SAE J185O. The terminal arrangement of DLC3 complies with SAE J1962 and matches the V.P.W. format.


By connecting the Data Link Connector terminals as described in test procedures, it is possible to control fuel pump operation, access the ignition signal for tachometer hookup, and several other functions including access of any Data Trouble Codes stored in the Engine Control Module.

HINT: If your display shows "UNABLE TO CONNECT TO VEHICLE" when you have connected the cable of the OBDII scan tool or LEXUS hand-held tester to DLC3, turned the ignition switch ON and operated the scan tool, there is a problem on the vehicle side or tool side.
- If communication is normal when the tool is connected to another vehicle, inspect DLC3 on the original vehicle.
- If communication is still not possible when the tool is connected to another vehicle, the problem is probably in the tool itself, so consult the Service Department listed in the tool's instruction manual.