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Diagnosis Procedure
1.CHECK FUSE
  1. Ignition switch OFF.
  2. Check that the following fuse is not blown (open).
    Signal nameFuse No.
    Rear seat heater LH power supply66 (30A)
Is the fuse blown (open)?
Replace the blown (open) fuse after repairing the affected circuit if a fuse is blown (open).
 
2.CHECK REAR SEAT HEATER LH POWER SUPPLY VOLTAGE
  1. Disconnect rear seat heater LH connector.
  2. Start the engine.
  3. Check voltage between rear seat heater LH harness connector and ground.
    +-Voltage
    Rear seat heater LH
    ConnectorTerminal
    B4051GroundBattery voltage
Is the inspection result normal?
Repair the rear seat heater LH power supply circuit.
 
3.CHECK REAR SEAT HEATER LH GROUND CIRCUIT (OPEN)
  1. Ignition switch OFF.
  2. Check continuity between rear seat heater LH harness connector and ground.
    Rear seat heater LHーContinuity
    ConnectorTerminal
    B4052GroundExisted
Is the inspection result normal?
Repair the harness or connector.
 
4.CHECK REAR SEAT HEATER LH LIN SIGNAL
  1. Connect rear seat heater LH connector.
  2. Ignition switch ON.
  3. Confirm output waveform between rear seat heater LH harness connector and A/C amp. harness connector with oscilloscope.
    +–Output waveform
    Rear seat heater LHA/C amp.
    ConnectorTerminalConnectorTerminal
    B4053M5558
Is the inspection result normal?
Replace seat cushion pad. Refer to Disassembly and Assembly.
 
5.CHECK REAR SEAT HEATER LH LIN SIGNAL CIRCUIT (OPEN)
  1. Ignition switch OFF.
  2. Disconnect rear seat heater LH connector and A/C amp. connector.
  3. Check continuity between rear seat heater LH harness connector and A/C amp. harness connector.
    Rear seat heater LHA/C amp.Continuity
    ConnectorTerminalConnectorTerminal
    B4053M5545Existed
Is the inspection result normal?
Repair the harness or connector.
 
6.CHECK REAR SEAT HEATER LH LIN SIGNAL CIRCUIT (SHORT TO GROUND)
  1. Disconnect following connectors.
    • Front seat heater LH
    • Front seat heater RH
    • Rear seat heater RH
  2. Check continuity between rear seat heater LH harness connector and ground.
    Rear seat heater LH—Continuity
    ConnectorTerminal
    B4053GroundNot existed
Is the inspection result normal?
Replace A/C amp. Refer to Removal and Installation.
Repair the harness or connector.