Diagnosis System
- DESCRIPTION
- Wireless door lock control system data and Diagnostic Trouble Codes (DTCs) can be read through the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioning, use the Techstream to check for malfunctions and perform repairs.
- CHECK DLC3
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.
If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector.
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) HIGH-level CAN bus line Ignition switch OFF* 54 to 69 Ω CANH (6) - Battery positive HIGH-level CAN bus line Ignition switch OFF* 1 kΩ or higher CANH (6) - CG (4) HIGH-level CAN bus line Ignition switch OFF* 1 kΩ or higher CANL (14) - Battery positive LOW-level CAN bus line Ignition switch OFF* 1 MΩ or higher CANL (14) - CG (4) LOW-level CAN bus line Ignition switch OFF* 1 MΩ or higher NOTE:*: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, other switches or doors.
HINT:
Connect the cable of the Techstream to the DLC3, turn the ignition switch ON and attempt to use the Techstream. If the screen displays UNABLE TO CONNECT TO VEHICLE, a problem exists in the vehicle side or the Techstream side.
If the communication is normal when the Techstream is connected to another vehicle, inspect the DLC3 on the original vehicle.
If the communication is still not possible when the Techstream is connected to another vehicle, the problem is probably in the Techstream itself. Consult the Service Department listed in the Techstream's instruction manual.