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1
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DETERMINE MALFUNCTION SYMPTOM
• Operate the seat warmer switches on the driver and passenger sides to turn on the seat warmer system for the driver and passenger sides.
• Does a malfunction occur with the seat warmer system on both sides?
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Yes
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Go to Step 8.
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No
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Go to the next step.
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2
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INSPECT FRONT SEAT WARMER CONTROL UNIT CONNECTOR AND SEAT WARMER UNIT CONNECTOR
• Switch the ignition OFF.
• Disconnect the negative battery terminal.
• Disconnect the front seat warmer control unit connector and the seat warmer unit connector on the side which does not operate.
• Inspect the connector engagement and connection condition, and inspect the terminals for damage, deformation, corrosion, or disconnection.
• Is the connector normal?
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Yes
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Go to the next step.
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No
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Repair or replace the connector, then go to Step 11.
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3
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VERIFY IF MALFUNCTION CAUSE IS FRONT SEAT WARMER CONTROL UNIT POWER SUPPLY CIRCUIT
• Verify that the front seat warmer control unit connector is disconnected.
• Connect the negative battery terminal.
• Switch the ignition ON (engine off or on).
• Measure the voltage at the following terminals (vehicle wiring harness side).
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― Front seat warmer control unit terminal O
― Front seat warmer control unit terminal M
• Is the voltage B+?
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Yes
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Go to the next step.
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No
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Inspect the SEAT WARM 20 A fuse.
If the fuse is blown:
• Refer to the wiring diagram and verify if there is a common wiring harness between the following terminals.
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― SEAT WARM 20 A fuse and front seat warmer control unit terminal O
― SEAT WARM 20 A fuse and front seat warmer control unit terminal M
If there is a common connector:
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• Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
• Repair or replace the malfunctioning location.
If there is no common connector:
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• Repair or replace the wiring harness which is shorted to ground.
• Replace the fuse.
If the fuse is damaged:
• Replace the fuse.
If the fuse is normal:
• Refer to the wiring diagram and verify if there is a common wiring harness between the following terminals.
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― SEAT WARM 20 A fuse and front seat warmer control unit terminal O
― SEAT WARM 20 A fuse and front seat warmer control unit terminal M
If there is a common connector:
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• Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
• Repair or replace the malfunctioning location.
If there is no common connector:
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• Repair or replace the wiring harness which has an open circuit.
Go to Step 11.
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4
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VERIFY IF MALFUNCTION CAUSE IS FRONT SEAT WARMER CONTROL UNIT POWER SUPPLY CIRCUIT
• Verify that the front seat warmer control unit connector is disconnected.
• Connect the negative battery terminal.
• Switch the ignition ON (engine off or on).
• Measure the voltage at the following terminals (vehicle wiring harness side).
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― Front seat warmer control unit terminal A
• Is the voltage B+?
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Yes
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Go to the next step.
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No
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• Refer to the wiring diagram and verify if there is a common wiring harness between the front body control module (FBCM) terminal 1C and front seat warmer control unit terminal A.
If there is a common connector:
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― Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
― Repair or replace the malfunctioning location.
If there is no common connector:
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― Repair or replace the wiring harness which is shorted to ground.
Go to Step 11.
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5
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VERIFY IF MALFUNCTION CAUSE IS OPEN CIRCUIT IN WIRING HARNESS BETWEEN FRONT SEAT WARMER CONTROL UNIT AND BODY GROUND
• Switch the ignition OFF (LOCK).
• Verify that the front seat warmer control unit connector is disconnected.
• Inspect for continuity between the following terminals (vehicle wiring harness side) and body ground.
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― Front seat warmer control unit terminal N
― Front seat warmer control unit terminal L
• Is there continuity?
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Yes
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Go to the next step.
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No
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• Refer to the wiring diagram and verify if there is a common connector between the following terminals and body ground.
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― Front seat warmer control unit terminal N
― Front seat warmer control unit terminal L
If there is a common connector:
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• Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
• Repair or replace the malfunctioning location.
If there is no common connector:
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• Repair or replace the wiring harness which has an open circuit.
• Go to Step 11.
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6
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VERIFY IF MALFUNCTION CAUSE IS SHORT CIRCUIT TO GROUND IN WIRING HARNESS BETWEEN FRONT SEAT WARMER CONTROL UNIT AND INDICATOR UNIT
• Verify that the front seat warmer control unit connector is disconnected.
• Disconnect the indicator unit connector.
• Inspect for continuity between front seat warmer control unit terminal J (vehicle wiring harness side) and body ground.
• Is there continuity?
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Yes
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• Refer to the wiring diagram and verify if there is a common connector between front seat warmer control unit terminal J and indicator unit terminal D.
If there is a common connector:
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― Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to ground to determine the malfunctioning location.
― Repair or replace the malfunctioning location.
If there is no common connector:
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― Repair or replace the wiring harness which is shorted to ground.
• Go to Step 11.
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No
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Go to the next step.
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7
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VERIFY IF MALFUNCTION CAUSE IS OPEN CIRCUIT IN WIRING HARNESS BETWEEN FRONT SEAT WARMER CONTROL UNIT AND INDICATOR UNIT
• Verify that the front seat warmer control unit connector and the indicator unit connector are disconnected.
• Inspect the wiring harness for continuity between front seat warmer control unit terminal J and indicator unit terminal D (vehicle wiring harness side).
• Is there continuity?
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Yes
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Go to the next step.
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No
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• Refer to the wiring diagram and verify if there is a common connector between front seat warmer control unit terminal J and indicator unit terminal D.
If there is a common connector:
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― Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
― Repair or replace the malfunctioning location.
If there is no common connector:
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― Repair or replace the wiring harness which has an open circuit.
• Go to Step 11.
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8
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VERIFY IF MALFUNCTION CAUSE IS SEAT WARMER UNIT
• Inspect the seat warmer unit on the side which has a malfunction.
• Is the seat warmer unit normal?
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Yes
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Go to the next step.
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No
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Replace the seat warmer unit (front seat cushion pad or front seat back pad) which has a malfunction, then go to Step 11.
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9
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DETERMINE IF MALFUNCTION CAUSE IS INDICATOR UNIT
• Inspect the indicator unit.
• Is the indicator unit normal?
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Yes
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Go to the next step.
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No
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Replace the indicator unit, then go to Step 11.
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10
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DETERMINE IF MALFUNCTION CAUSE IS FRONT SEAT WARMER CONTROL UNIT
• Reconnect all the disconnected connectors.
• Connect the negative battery terminal.
• Switch the ignition ON (engine off or on).
• Operate the seat warmer switch to turn on the seat warmer system.
• Does the seat warmer system operate normally?
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Yes
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Go to the next step.
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No
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Replace the front seat warmer control unit, then go to the next step.
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11
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VERIFY IF MALFUNCTION CAUSE IS CORRECTED
• Operate the seat warmer switch to turn on the seat warmer system.
• Does the seat warmer system operate normally?
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Yes
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Troubleshooting completed. (Explain the contents of the servicing to the customer.)
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No
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Verify the malfunction symptom in the symptom troubleshooting chart and perform the other applicable malfunction diagnosis.
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