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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.
    Second seat heater RH power supply66 (30A)
Is the inspection result normal?
Replace the blown (open) fuse after repairing the affected circuit if a fuse is blown (open).
 
2.CHECK SECOND SEAT HEATER RH POWER SUPPLY VOLTAGE
  1. Disconnect second seat heater RH connector.
  2. Change the power supply mode of the electric motor switch to ON (READY indicator: ON).
  3. Check voltage between second seat heater RH harness connector and ground.
    +–Voltage
    Second seat heater RH
    ConnectorTerminal
    B5283GroundBattery voltage
Is the inspection result normal?
Repair the second seat heater RH power supply circuit.
 
3.CHECK SECOND SEAT HEATER RH GROUND CIRCUIT (OPEN)
  1. Electric motor switch OFF.
  2. Check continuity between second seat heater RH harness connector and ground.
    Second seat heater RH–Continuity
    ConnectorTerminal
    B5285GroundExisted
Is the inspection result normal?
Repair the harness or connector.
 
4.CHECK SECOND SEAT HEATER RH LIN SIGNAL
  1. Connect second seat heater RH connector.
  2. Electric motor switch ON.
  3. Confirm output waveform between second seat heater RH harness connector and A/C amp. harness connector with oscilloscope.
    +–Output waveform
    Second seat heater RHA/C amp.
    ConnectorTerminalConnectorTerminal
    B5284M5558
Is the inspection result normal?
Replace seat cushion pad. Refer to Disassembly and Assembly.
 
5.CHECK SECOND SEAT HEATER RH LIN SIGNAL CIRCUIT (OPEN)
  1. Electric motor switch OFF.
  2. Disconnect second seat heater RH connector and A/C amp. connector.
  3. Check continuity between second seat heater RH harness connector and A/C amp. harness connector.
    Second seat heater RHA/C amp.Continuity
    ConnectorTerminalConnectorTerminal
    B5284M5545Existed
Is the inspection result normal?
Repair the harness or connector.
 
6.CHECK SECOND SEAT HEATER RH LIN SIGNAL CIRCUIT (SHORT TO GROUND)
  1. Disconnect following connectors.
    • Front seat heater LH
    • Front seat heater RH
    • Second seat heater LH
  2. Check continuity between second seat heater RH harness connector and ground.
    Second seat heater RH–Continuity
    ConnectorTerminal
    B5284GroundNot existed
Is the inspection result normal?
Replace A/C amp. Refer to Removal and Installation.
Repair the harness or connector.