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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 LH 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 LH POWER SUPPLY VOLTAGE
  1. Disconnect front seat heater LH connector.
  2. Start the engine.
  3. Check voltage between front seat heater LH harness connector and ground.
    +-Voltage
    Front seat heater LH
    ConnectorTerminal
    B2041GroundBattery voltage
Is the inspection result normal?
Repair the front seat heater LH power supply circuit.
 
3.CHECK FRONT SEAT HEATER LH GROUND CIRCUIT (OPEN)
  1. Ignition switch OFF.
  2. Check continuity between front seat heater LH harness connector and ground.
    Front seat heater LH–Continuity
    ConnectorTerminal
    B2042GroundExisted
Is the inspection result normal?
Repair the harness or connector.
 
4.CHECK FRONT SEAT HEATER LH LIN SIGNAL
  1. Connect front seat heater LH connector.
  2. Ignition switch ON.
  3. Confirm output waveform between front seat heater LH harness connector and A/C amp. harness connector with oscilloscope.
    +–Output waveform
    Front seat heater LHA/C amp.
    ConnectorTerminalConnectorTerminal
    B2043M5558
Is the inspection result normal?
Replace seat cushion pad. Refer to Disassembly and Assembly.
 
5.CHECK FRONT SEAT HEATER LH LIN SIGNAL CIRCUIT (OPEN)
  1. Ignition switch OFF.
  2. Disconnect front seat heater LH connector and A/C amp. connector.
  3. Check continuity between front seat heater LH harness connector and A/C amp. harness connector.
    Front seat heater LHA/C amp.Continuity
    ConnectorTerminalConnectorTerminal
    B2043M5545Existed
Is the inspection result normal?
Repair the harness or connector.
 
6.CHECK FRONT SEAT HEATER LH LIN SIGNAL CIRCUIT (SHORT TO GROUND)
  1. Disconnect following connectors.
    • Front seat heater RH
    • Rear seat heater LH
    • Rear seat heater RH
  2. Check continuity between front seat heater LH harness connector and ground.
    Front seat heater LH–Continuity
    ConnectorTerminal
    B2043GroundNot existed
Is the inspection result normal?
Replace A/C amp. Refer to A/C AMP. REMOVAL AND INSTALLATION.
Repair the harness or connector.