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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.
    Front seat heater RH power supply67 (30A)
Is the fuse blown (open)?
Replace the blown (open) fuse after repairing the affected circuit if a fuse is blown (open).
 
2.CHECK FRONT SEAT HEATER RH POWER SUPPLY VOLTAGE
  1. Disconnect front seat heater RH connector.
  2. Start the engine.
  3. Check voltage between front seat heater RH harness connector and ground.
    +-Voltage
    Front seat heater RH
    ConnectorTerminal
    B3041GroundBattery voltage
Is the inspection result normal?
Repair the front seat heater RH power supply circuit.
 
3.CHECK FRONT SEAT HEATER RH GROUND CIRCUIT (OPEN)
  1. Ignition switch OFF.
  2. Check continuity between front seat heater RH harness connector and ground.
    Front seat heater RHーContinuity
    ConnectorTerminal
    B3042GroundExisted
Is the inspection result normal?
Repair the harness or connector.
 
4.CHECK FRONT SEAT HEATER RH LIN SIGNAL
  1. Connect front seat heater RH connector.
  2. Ignition switch ON.
  3. Confirm output waveform between front seat heater RH harness connector and A/C amp. harness connector with oscilloscope.
    +–Output waveform
    Front seat heater RHA/C amp.
    ConnectorTerminalConnectorTerminal
    B3043M5558
Is the inspection result normal?
Replace seat cushion pad. Refer to Disassembly and Assembly.
 
5.CHECK FRONT SEAT HEATER RH LIN SIGNAL CIRCUIT (OPEN)
  1. Ignition switch OFF.
  2. Disconnect front seat heater RH connector and A/C amp. connector.
  3. Check continuity between front seat heater RH harness connector and A/C amp. harness connector.
    Front seat heater RHA/C amp.Continuity
    ConnectorTerminalConnectorTerminal
    B3043M5545Existed
Is the inspection result normal?
Repair the harness or connector.
 
6.CHECK FRONT SEAT HEATER RH LIN SIGNAL CIRCUIT (SHORT TO GROUND)
  1. Disconnect following connectors.
    • Front seat heater LH
    • Rear seat heater LH
    • Rear seat heater RH
  2. Check continuity between front seat heater RH harness connector and ground.
    Front seat heater RH—Continuity
    ConnectorTerminal
    B3043GroundNot existed
Is the inspection result normal?
Replace A/C amp. Refer to Removal and Installation.
Repair the harness or connector.