Heated Seat Components
The heated seat system consists of the following components:
• Driver and passenger heated seat switches
• Driver and passenger seat back heater elements
• Driver and passenger seat cushion heater elements
• Driver and passenger seat back temperature sensors
• Driver seat module
• Driver door module
• Passenger door module
When there are modules involved in the operation of any componet that's acting up , the module's electronic's could be the culprit ! But without testing who's to say what the problem could be !
I would have it check for DTC'S
DTC B2425 or B2430
The driver and passenger seat heaters are controlled by the driver seat module. Power is supplied to the driver seat cushion and back heater elements through individual voltage supply circuits. Power is supplied to the passenger seat cushion and back heater elements through a common voltage supply circuit. All of the driver and passenger seat heater elements are grounded by the driver seat module through individual low side drive control circuits. The heater element control circuits are pulse width modulated to ground by the driver seat module in order to control the seat temperatures by regulating the current flow through the heater elements.
DTC B2435 or B2440
The driver seat module relies on inputs from thermistors installed in the driver and passenger seat backs to control heated seat temperatures. The thermistors are 2-wire sensors supplied with a 5-volt referenced signal circuit and low reference circuit from the driver seat module. Resistance through the thermistors varies with temperature causing the heated seat sensor signal circuit voltage levels to decrease as the seat back temperatures rise.
Install a scan tool.
Start the engine.
Turn the heated seat ON.
With a scan tool, observe the Heated Seat Sensor parameter in the data list for the driver seat module.
Does the scan tool indicate that the heated seat sensor parameter is within the specified range?
0.078-4.94 V
This appears to be a copy from a GM service manual - what's the fix to prevent the seat heater from automatically turning on when starting the vehicle? I assume I have some sort of grounding problem, so I'll trace from the door panel switch. the driver side fuse panel, etc.
Do you have a wiring diagram , pin out of connectors to the driver seat module ? And the information is out of GM service repair manual , how do you expect to fix something you have no clue as to how it works . Hooking up a professional type scan tool checking for code in the driver seat module would be my first step .If no codes checking power and grounds at the driver seat module would be my next step . Myself , i would think the driver seat module was bad . The switch and the heating elements in the seat ground through the driver seat module . Your best bet have a qaulified repair shop check it out , one that follows proper diagonstic procedures .
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