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Symptom Table
  1. Using M.U.T.-III SE, perform "Data List" of BCM (combination switch).
  2. Check that the data monitor display switches in conjunction with the combination switch operation.
  3. If there is a switch whose display does not change, specify the applicable combination switch circuit (INPUT 1 - 6 and OUTPUT 1 - 5) using the combination switch circuit confirmation table for the circuit used for that switch.
    noteSince combination switch circuit is share with multiple switches, if the switches used other than the defective switch are normal, the combination switch circuit can be determined to be normal.
    Example: If the circuit used for the switch corresponds to INPUT 1 and OUTPUT 2 of the combination switch circuit, but the other switches that use the INPUT 1 circuit are normal, it is determined that the INPUT 1 circuit is normal and inspection OUTPUT 2 circuit. If other switches that use OUTPUT 2 circuit are normal, the combination switch circuit (INPUT 1 and OUTPUT 2) is determined to be normal, and it can be determined that the combination switch is defective.
    Combination switch circuit confirmation table
    Circuit used: ×
    Data monitor itemCombination switch circuit
    INPUT 1INPUT 2INPUT 3INPUT 4INPUT 5INPUT 6OUTPUT 1OUTPUT 2OUTPUT 3OUTPUT 4OUTPUT 5
    Check diode 1××
    High beam switch××
    Passing switch××
    Front fog switch××
    INT volume 1××
    Check diode 2××
    Low beam switch××
    AUTO light switch××
    Tail light switch××
    Front washer switch××
    Rear washer switch××
    Check diode 3××
    Turn signal LH××
    Turn signal RH××
    Front wiper LO××
    Front wiper HI××
    Front wiper INT××
    Check diode 4××
    Light OFF switch××
    INT volume 2××
    INT volume 3××
    Rear wiper INT××
    Rear wiper ON××
    Check diode 5××
    Front wiper OFF××
    Front wiper MIST××
  4. Identify the possible malfunctioning part from combination switch circuit confirmation table and inspection or replace it.
    Possible malfunction part / SymptomInspection / Replace
    Some data monitor displays do not switchThere is a malfunction with either of the combination switch INPUT circuitInspect the combination switch input circuit applicable to the malfunctioning part. Refer to Diagnosis Procedure.
    There is a malfunction with either of the combination switch OUTPUT circuitInspect the combination switch output circuit applicable to the malfunctioning part. Refer to Diagnosis Procedure.
    It is not applicable to any of the combination switch INPUT circuit and OUTPUT circuitReplace combination switch. Refer to Removal and Installation.
    If the data monitor display does not switch for a specific switch, the corresponding switch has a malfunction.
    All data monitor displays do not switchReplace BCM. Refer to Removal and Installation.
    All data monitor displays switchCheck intermittent incident. Refer to Intermittent IncidentIntermittent Incident.