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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 LH power supply5 (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 LH POWER SUPPLY VOLTAGE
  1. Disconnect front seat heater LH connector.
  2. Change the power supply mode of the electric motor switch to ON (READY indicator: ON).
  3. Check voltage between front seat heater LH harness connector and ground.
    +–Voltage
    Front seat heater LH
    ConnectorTerminal
    B515 <Without automatic drive positioner>6GroundBattery voltage
    B516 <With automatic drive positioner>11
Is the inspection result normal?
Repair the front seat heater LH power supply circuit.
 
3.CHECK FRONT SEAT HEATER LH GROUND CIRCUIT (OPEN)
  1. Electric motor switch OFF.
  2. Check continuity between front seat heater LH harness connector and ground.
    Front seat heater LH–Continuity
    ConnectorTerminal
    B515 <Without automatic drive positioner>2GroundExisted
    B516 <With automatic drive positioner>13
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. Electric motor 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
    B515 <Without automatic drive positioner>4M5558
    B516 <With automatic drive positioner>12
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. Electric motor 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
    B515 <Without automatic drive positioner>4M5545Existed
    B516 <With automatic drive positioner>12
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
    • Second seat heater LH
    • Second seat heater RH
  2. Check continuity between front seat heater LH harness connector and ground.
    Front seat heater LH–Continuity
    ConnectorTerminal
    B515 <Without automatic drive positioner>4GroundNot existed
    B516 <With automatic drive positioner>12
Is the inspection result normal?
Replace A/C amp. Refer to Removal and Installation.
Repair the harness or connector.