SEAT WARMER UNIT INSPECTION

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Warning
•  Handling a front seat equipped with a side air bag improperly can accidentally operate (deploy) the air bag, which may seriously injure you. Read the service warnings/cautions in the Workshop Manual before handling the front seat (side air bag integrated). (See AIR BAG SYSTEM SERVICE WARNINGS.) (See AIR BAG SYSTEM SERVICE CAUTIONS.)

Simple Inspection

1.  Place a cooling agent on the seat cushion (thermistor).

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2.  Operate the seat warmer switch to turn on the seat warmer.

3.  Touch the seat cushion and the seat back to verify a temperature increase.

4.  If a temperature increase cannot be verified, go to the resistance inspection. (See Resistance Inspection.)


Resistance Inspection


Driver-side

Front seat cushion
1.  Switch the ignition to off.
2.  Disconnect the negative battery cable and wait 1 min or more. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].)(See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].)
3.  Disconnect the driver-side seat warmer unit connector.
4.  Inspect for continuity between the driver-side seat warmer unit connector terminal 5C—5D.
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―  If not as indicated in the table, replace the front seat cushion pad. (See FRONT SEAT CUSHION TRIM REMOVAL/INSTALLATION.)
5.  Measure the resistance between the driver-side seat warmer unit connector terminals 5A and 5B, and verify that the condition is as indicated in the table.
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―  If the thermistor characteristic is not as shown in the graph, replace the front seat cushion pad. (See FRONT SEAT CUSHION TRIM REMOVAL/INSTALLATION.)
Front seat back
1.  Switch the ignition to off.
2.  Disconnect the negative battery cable and wait 1 min or more. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].)(See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].)
3.  Disconnect the driver-side seat warmer unit connector.
4.  Inspect for continuity between the driver-side seat warmer unit connector (short cord) terminal A—B.
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―  If not as indicated in the table, replace the front seat back pad. (See FRONT SEAT BACK TRIM REMOVAL/INSTALLATION.)


Passenger-side (leather type)

Front seat cushion
1.  Switch the ignition to off.
2.  Disconnect the negative battery cable and wait 1 min or more. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].)(See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].)
3.  Disconnect the passenger-side seat warmer unit connector.
4.  Inspect for continuity between the passenger-side seat warmer unit connector terminal A—G.
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―  If not as indicated in the table, replace the front seat cushion pad. (See FRONT SEAT CUSHION TRIM REMOVAL/INSTALLATION.)
5.  Measure the resistance between the passenger-side seat warmer unit connector terminals B and D, and verify that the condition is as indicated in the table.
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―  If the thermistor characteristic is not as shown in the graph, replace the front seat cushion pad. (See FRONT SEAT CUSHION TRIM REMOVAL/INSTALLATION.)
Front seat back
1.  Switch the ignition to off.
2.  Disconnect the negative battery cable and wait 1 min or more. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].)(See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].)
3.  Disconnect the passenger-side seat warmer unit connector.
4.  Inspect for continuity between the passenger-side seat warmer unit connector (short cord) terminal A—B.
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―  If not as indicated in the table, replace the front seat back pad. (See FRONT SEAT BACK TRIM REMOVAL/INSTALLATION.)


Passenger-side (cloth type)

Front seat cushion
1.  Switch the ignition to off.
2.  Disconnect the negative battery cable and wait 1 min or more. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].)(See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].)
3.  Disconnect the passenger-side seat warmer unit connector.
4.  Inspect for continuity between the passenger-side seat warmer unit connector terminal A—F.
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―  If not as indicated in the table, replace the front seat cushion pad. (See FRONT SEAT CUSHION TRIM REMOVAL/INSTALLATION.)
5.  Measure the resistance between the passenger-side seat warmer unit connector terminals B and C, and verify that the condition is as indicated in the table.
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•  If the thermistor characteristic is not as shown in the graph, replace the front seat cushion pad. (See FRONT SEAT CUSHION TRIM REMOVAL/INSTALLATION.)
Front seat back
1.  Switch the ignition to off.
2.  Disconnect the negative battery cable and wait 1 min or more. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [MZR 1.6].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 1.5, SKYACTIV-G 2.0, SKYACTIV-G 2.5].) (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 2.2].)(See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-D 1.5].)
3.  Disconnect the passenger-side seat warmer unit connector.
4.  Inspect for continuity between the passenger-side seat warmer unit connector (short cord) terminal A—B.
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―  If not as indicated in the table, replace the front seat back pad. (See FRONT SEAT BACK TRIM REMOVAL/INSTALLATION.)