WINDOW DEFOGGER SYSTEM > DIAGNOSIS SYSTEM

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DESCRIPTION

  1. The defogger system data can be read in 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 repairs.


CHECK DLC3


    A082779E17

  1. The vehicle uses ISO 9141-2 (Euro-OBD) as its communication protocol. The terminal arrangement of the DLC3 complies with ISO 15031-3 and matches the ISO 9141-2 format.
    Verify the conditions listed in the table below:

    Standard voltage:

    Symbol (Terminal No.)
    		Terminal Description
    		Condition
    		Specified Condition
    SIL (7) - SG (5)
    		Bus "+" line
    		During transmission
    		Pulse generation
    BAT (16) - Body ground
    		Battery positive
    		Always
    		10 to 14 V


    Standard resistance:

    Symbol (Terminal No.)
    		Terminal Description
    		Condition
    		Specified Condition
    CG (4) - Body ground
    		Chassis ground
    		Always
    		Below 1 Ω
    SG (5) - Body ground
    		Signal ground
    		Always
    		Below 1 Ω
    CANH (6) - CANL (14)
    		HIGH-level CAN bus line
    		Engine switch off
    		54 to 67 Ω
    CANH (6) - Body positive (+)
    		HIGH-level CAN bus line
    		Engine switch off
    		1 MΩ or higher
    CANH (6) - CG (4)
    		HIGH-level CAN bus line
    		Engine switch off
    		3 MΩ or higher
    CANL (14) - Body positive (+)
    		LOW-level CAN bus line
    		Engine switch off
    		1 MΩ or higher
    CANL (14) - CG (4)
    		LOW-level CAN bus line
    		Engine switch off
    		3 MΩ or higher

    If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector.

    HINT:
    E109221E07
    Connect the cable of the intelligent tester to the DLC3, turn the ignition switch 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.
    1. If communication is normal when the tester is connected to another vehicle, inspect the DLC3 of the original vehicle.
    2. If communication is still not possible when the tester is connected to another vehicle, the problem may be in the intelligent tester itself. Consult the Service Department listed in the tester's instruction manual.


CHECK BATTERY VOLTAGE
If the voltage is below 11 V, recharge or replace the battery before proceeding.

Standard voltage:
11 to 14 V