Air Conditioning System (For Automatic Air Conditioning System) Diagnosis System
LIST OF OPERATION METHODS
CHECK DLC3
Air Conditioning System (For Automatic Air Conditioning System) -- Diagnosis System |
| LIST OF OPERATION METHODS |
By operating each of the air conditioning control switches as shown in the diagram below, it is possible to enter the diagnostic check mode.
The vehicle's ECM uses the ISO 14230 (M-OBD) communication protocol. The terminal arrangement of the DLC3 complies with ISO 15031-03 and matches the ISO 14230 format.
If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector.
Terminal No. (Symbol)
| Terminal Description
| Condition
| Specified Condition
|
7 (SIL) - 5 (SG)
| Bus "+" line
| During transmission
| Pulse generation
|
4 (CG) - Body ground
| Chassis ground
| Always
| Below 1 Ω
|
5 (SG) - Body ground
| Signal ground
| Always
| Below 1 Ω
|
16 (BAT) - Body ground
| Battery positive
| Always
| 11 to 14 V
|
- HINT:
- Connect the cable of the intelligent tester to the DLC3, turn the ignition switch to ON 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 on the original vehicle.
- If communication is still not possible when the tester is connected to another vehicle, the problem is probably in the tester itself. Consult the Service Department listed in the tester's instruction manual.
