My heated seat lights are going on and off like crazy. The lights are flashing and the seats are heating up and goin off. Sometimes its just the lights going on and off. What the hell is causing this, its driving me nuts. I unplugged the heat pads at the seat but the lights are still acting nuts. Anybody ever experience this???

 

SELF-DIAGNOSIS
The heated seat system is capable of performing some self-diagnostics. The following table depicts the various failure modes which will be reported to the vehicle operator or technician by flashing the individual heated seat switch Light Emitting Diode (LED) indicator lamps. See the Heated Seat System Self-Diagnosis table for the diagnostic routines. The driver side heated seat switch indicator lamps will flash if a failure occurs in the driver side heated seat, and the passenger side heated seat switch indicator lamps will flash for a passenger side heated seat failure. If a monitored heated seat system failure occurs, the switch indicator lamps will flash at a pulse rate of about one-half second ON, followed by about one-half second OFF for a duration of about one minute after the switch for the faulty heated seat is depressed in either the Low or High direction. This process will repeat every time the faulty heated seat switch is actuated until the problem has been corrected.

TESTING
Refer to Power Seat for the location of complete heated seat system wiring diagrams. Before testing the individual components in the heated seat system, perform the following preliminary checks:

WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, DISABLE THE AIRBAG SYSTEM BEFORE ATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE. DISCONNECT AND ISOLATE THE BATTERY NEGATIVE (GROUND) CABLE, THEN WAIT TWO MINUTES FOR THE AIRBAG SYSTEM CAPACITOR TO DISCHARGE BEFORE PERFORMING FURTHER DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE WAY TO DISABLE THE AIRBAG SYSTEM. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIR- BAG DEPLOYMENT AND POSSIBLE PERSONAL INJURY.

If the heated seat switch back lighting does not illuminate (Refer to HEATED SEATS/DRIVER HEATED SEAT SWITCH - DIAGNOSIS AND TESTING).
If a single indicator lamp for one heated seat switch does not operate and the heated seat elements do heat (Refer to HEATED SEATS/DRIVER HEATED SEAT SWITCH - DIAGNOSIS AND TESTING).
If both indicator lamps for a heated seat switch operate, but the heated seat elements do not heat, refer to Heated Seat Module in Electronic Control Modules for the location of the proper heated seat module diagnosis and testing procedures. Also refer to the Body Diagnostic for additional diagnosis and testing procedures.
If none of the indicator lamps for both heated seat switches will operate and the heated seat elements for both seats do not heat (Refer to ELECTRONIC CONTROL MODULES/MEMORY HEATED SEAT/MIRROR MODULE - DIAGNOSIS AND TESTING).
If the an indicator lamp on either heated seat switch remains illuminated after the heated seat has been turned OFF (Refer to ELECTRONIC CONTROL MODULES/MEMORY HEATED SEAT/MIRROR MODULE - DIAGNOSIS AND TESTING). Also refer to the Body Diagnostic for additional diagnosis and testing procedures.


Heated Seat Element and Sensor Test

The heated seat module will self-diagnose shorted or open heated seat element circuits and the sensor circuits. Refer to Heated Seat System for the location of the proper heated seat system diagnosis and testing procedures. To manually check the heated seat element and sensor circuits, proceed as follows. The wire harness connectors for the seat cushion heated seat element and sensor and for the seat back heated seat element are located under the seat, near the rear edge of the seat cushion frame.

Heated Seat Element


1.Disconnect and isolate the battery negative cable. Disconnect the 4-way heated seat wire harness connector. Check for continuity between the two heated seat element circuit cavities in the seat cushion trim cover half of the 4-way heated seat wire harness connector. There should be continuity. If OK, go to Step 2. If not OK, go to Step 3.
2.Check for continuity between one of the heated seat element circuit cavities in the seat cushion trim cover half of the 4-way heated seat wire harness connector and the seat cushion frame. There should be no continuity. If OK, go to Step 5. If not OK, go to Step 4.
3.Disconnect the 2-way heated seat wire harness connector between the seat cushion trim cover and the seat back trim cover. Check for continuity between the heated seat element circuit cavity and the ground circuit cavity in the seat back trim cover half of the 2-way heated seat wire harness connector. There should be continuity. If OK, go to Step 5. If not OK, replace the faulty seat back trim cover unit.
4.Check for continuity between the heated seat element circuit cavity in the seat back trim cover half of the 2-way heated seat wire harness connector and the seat back frame. There should be no continuity. If OK, go to Step 5. If not OK, replace the faulty seat back trim cover unit.
5.Test the seat wire harness between the heated seat module connector and the 4-way heated seat wire harness connectors for shorted or open circuits. If OK, replace the faulty seat cushion trim cover unit. If not OK, repair the shorted or open seat wire harness as required.

Heated Seat Sensor
1.Disconnect and isolate the battery negative cable. Disconnect the 4-way heated seat wire harness connector. Using an ohmmeter, check the resistance between the heated seat sensor input circuit cavity and the heated seat sensor feed circuit cavity in the seat cushion cover half of the 4-way heated seat wire harness connector. The heated seat sensor resistance should be between 600 ohms and 200 kilo ohms . If OK, go to Step 2. If not OK, replace the faulty seat cushion trim cover unit.
2.Test the seat wire harness between the heated seat module connector and the 4-way heated seat wire harness connector for shorted or open circuits. If OK, (Refer to ELECTRONIC CONTROL MODULES/MEMORY HEATED SEAT/MIRROR MODULE - DIAGNOSIS AND TESTING). Also refer to the Body Diagnostic for additional diagnosis and testing procedures. If not OK, repair the shorted or open heated seat wire harness as required.

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Heated Seat System Self-Diagnosis Monitored Failure Switch High Indicator Lamp Switch Low Indicator Lamp Heated Seat Element Shorted Flashing Flashing Heated Seat Element Open Flashing Off Heated Seat Sensor Value Out of Range Off Flashing

 

This should help:

 

Well why would it be doing this all on its own? And heating the seat up on its own. As soon as you crank the truck, the seats go nuts! I appreciate the valuable info. And I know how to troubleshoot so it shouldn't be a problem. But I wouldn't think the seats would activate without hitting the switch. I just noticed my butt sweating like crazy and looked over at the switches blinking like christmas trees! LOL

 

Look at my post - it looks like the elements are shorted. Thats a place to start at least.

 

No shorts and no open points! BUT it did rain very heavy the day this happened. Could moisture have gotten in the can-bus and caused a problem?

 

Ig I answered that I would be guessing. Good luck.