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Diagnosis Procedure
1.CHECK INSIDE KEY ANTENNA INPUT SIGNAL 1
  1. Ignition switch ON.
  2. Check signal between Keyless operation key unit harness connector and ground using oscilloscope.
    (+)(–)ConditionSignal
    (Reference value)
    Keyless operation key unit
    ConnectorTerminal
    M18433GroundPress push-button ignition switchWhen Keyless operation key is in the passenger compartment
    When Keyless operation key is not in the passenger compartment
    34When Keyless operation key is in the passenger compartment
    When Keyless operation key is not in the passenger compartment
Is the inspection result normal?
Replace Keyless operation key unit. Refer to Removal and Installation.
.
 
2.CHECK INSIDE KEY ANTENNA CIRCUIT
  1. Ignition switch OFF.
  2. Disconnect Keyless operation key unit connector and inside key antenna connector.
  3. Check continuity between Keyless operation key unit harness connector and inside key antenna harness connector.
    NML Plant
    Keyless operation key unitInside key antennaContinuity
    ConnectorTerminalConnectorTerminal
    M18433B772Existed
    341
    NNA Plant
    Keyless operation key unitInside key antennaContinuity
    ConnectorTerminalConnectorTerminal
    M18433B832Existed
    341
  4. Check continuity between Keyless operation key unit harness connector and ground.
    Keyless operation key unit—Continuity
    ConnectorTerminal
    M18433GroundNot existed
    34
Is the inspection result normal?
.
Repair or replace harness.
 
3.CHECK INSIDE KEY ANTENNA INPUT SIGNAL 2
  1. Replace inside key antenna. (New antenna or other antenna)
  2. Connect Keyless operation key unit connector and inside key antenna connector.
  3. Ignition switch ON.
  4. Check signal between Keyless operation key unit harness connector and ground using oscilloscope.
    (+)(–)ConditionSignal
    (Reference value)
    Keyless operation key unit
    ConnectorTerminal
    M18433GroundPress push-button ignition switchWhen Keyless operation key is in the passenger compartment
    When Keyless operation key is not in the passenger compartment
    34When Keyless operation key is in the passenger compartment
    When Keyless operation key is not in the passenger compartment
Is the inspection result normal?
Replace inside key antenna. Refer to Removal and Installation.
Replace Keyless operation key unit. Refer to Removal and Installation.