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Diagnosis Procedure
1.CHECK FUSE
  1. Electric motor switch OFF.
  2. Check that the following fuse is not blown (open).
    Signal nameFuse No.
    Front seat heater RH power supply4 (15A)
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. Change the power supply mode of the electric motor switch to ON (READY indicator: ON).
  3. Check voltage between front seat heater RH harness connector and ground.
    +–Voltage
    Front seat heater RH
    ConnectorTerminal
    B512 <Without automatic drive positioner>6GroundBattery voltage
    B513 <With automatic drive positioner>11
Is the inspection result normal?
Repair the front seat heater RH power supply circuit.
 
3.CHECK FRONT SEAT HEATER RH GROUND CIRCUIT (OPEN)
  1. Electric motor switch OFF.
  2. Check continuity between front seat heater RH harness connector and ground.
    Front seat heater RH–Continuity
    ConnectorTerminal
    B512 <Without automatic drive positioner>2GroundExisted
    B513 <With automatic drive positioner>13
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. Electric motor 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
    B512 <Without automatic drive positioner>4M5558
    B513 <With automatic drive positioner>12
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. Electric motor 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
    B512 <Without automatic drive positioner>4M5545Existed
    B513 <With automatic drive positioner>12
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
    • Second seat heater LH
    • Second seat heater RH
  2. Check continuity between front seat heater RH harness connector and ground.
    Front seat heater RH–Continuity
    ConnectorTerminal
    B512 <Without automatic drive positioner>4GroundNot existed
    B513 <With automatic drive positioner>12
Is the inspection result normal?
Replace A/C amp. Refer to Removal and Installation.
Repair the harness or connector.