Pinpoint Test 6

PINPOINT TEST 6: THE HEATED SEAT IS INOPERATIVE

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Normal Operation
The driver and passenger heated seats share a common battery and ignition feed. A shared ground source supplies the heated seat control switches. When the heated seat control switch is pressed with the ignition switch in RUN or START, a momentary ground signal is sent to the heated seat module. The heated seat module then supplies power to the heating element circuit. The cushion element and seat backrest element are wired in series and powered by the same output. The heated seat module also will power the separate indicator circuit for the indicator to illuminate (located in the heated seat switch) to indicate an ON state. The heated seat module will remain on until the heated seat control switch is pressed and a momentary ground signal is received, or until 10 minutes expire. If the ignition source is removed from the module, the heated seat module will enter an OFF state and will not return to ON until the switch is once again pressed with the ignition switch in RUN. The heated seat module is designed to heat the seat to 37.5 °C (99.5 °F) and maintain the temperature until time-out or until switched off. This temperature is maintained by the heated seat module monitoring the temperature sensor, located in the seat cushion element and duty cycling the current flow to the heating elements.

Possible Causes
- circuitry
- heated seat switch(es)
- heated seat module(s)
- heated seat element(s)
- heated seat temperature sensor(s)

WARNING: The restraint system diagnostic tool is for restraint system repair only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards. Failure to follow these instructions may result in personal injury.

NOTE: If a seat equipped with a seat-mounted side air bag and/or a seat belt pretensioner (if equipped) system is being repaired, the supplemental restraint system (SRS) must be depowered.

NOTE: The air bag warning lamp will illuminate when the RCM fuse is removed and the ignition switch is ON. This is normal operation and does not indicate a supplemental restraint system (SRS) fault.

NOTE: The SRS must be fully operational and free of faults before releasing the vehicle to the customer.