Air Conditioning System (For Automatic Air Conditioning System) Diagnosis System
DESCRIPTION
CHECK DLC3
Air Conditioning System (For Automatic Air Conditioning System) -- Diagnosis System |
Air conditioning system data and the 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 intelligent tester to check for malfunctions and perform troubleshooting.
The vehicle uses the ISO 15765-4 communication protocol. The terminal arrangement of the DLC3 complies with ISO 15031-03 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
| 10 to 14 V
|
CANH (6) - CANL (14)
| HIGH-level CAN bus line
| Ignition switch off*
| 54 to 69 Ω
|
CANH (6) - CG (4)
| HIGH-level CAN bus line
| Ignition switch off*
| 200 Ω or higher
|
CANH (6) - BAT (16)
| HIGH-level CAN bus line
| Ignition switch off*
| 1 MΩ or higher
|
CANL (14) - CG (4)
| LOW-level CAN bus line
| Ignition switch off*
| 200 Ω or higher
|
CANL (14) - BAT (16)
| LOW-level CAN bus line
| Ignition switch off*
| 1 MΩ or higher
|
- NOTICE:
- *: 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 intelligent tester to the DLC3, turn the ignition 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.
