Diagnosis System
- DESCRIPTION
- The driver side J/B ECU controls the function of the seat belt warning system on the vehicle. Data of the seat belt warning system 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.
- The driver side J/B ECU controls the function of the seat belt warning system on the vehicle. Data of the seat belt warning system can be read in the Data Link Connector 3 (DLC3) of the vehicle.
- 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.
TERMINAL DESCRIPTION CHARTSymbols (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 14V 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 is probably in the tester itself. Consult the Service Department listed in the taster's instruction manual.
- INSPECT BATTERY VOLTAGE
- Standard: 11 to 14 V
If voltage is below 11 V, recharge the battery before proceeding.