Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Passenger Seat Module (PSM)
- Battery Voltage
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Displays the voltage of the battery positive supply circuit to the seat module.
- Ignition Since Current DTC
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Displays the number of ignition cycles on/off since the DTC set.
- Seat Heat Zone
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Displays the active seat heat zones. The scan tool will display Back Only when the heated seat back is operating in the low, medium, or high modes and the heated seat cushion is off. Back and Cushion will be displayed when both heater elements are operating in the low, medium, or high modes.
- Seat Temp Setting
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Displays current status of the heated seat temperature setting during back only or back and cushion heating modes.
- Recline Switch
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Displays current status of the seat recline adjuster switch forward, backward, or inactive.
- Recliner Motor
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Displays the current state of the recliner motor.
- Horizontal Position Switch
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Displays current status of the seat horizontal adjuster switch forward, backward, or inactive.
- Horizontal Motor
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Displays the current state of the horizontal motor.
- Rear Vertical Position Switch
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Displays current status of the seat rear vertical adjuster switch up, down, or inactive.
- Rear Vertical Motor
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Displays the current state of the rear vertical motor.
- Front Vertical Position Switch
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Displays current status of the seat front vertical adjuster switch up, down, or inactive.
- Front Vertical Motor
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Displays the current state of the front vertical motor.
- Lumbar/Bolster Switch
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Displays current status of the seat lumbar switch. The scan tool will display the direction that the lumbar switch is being operated.
- Horizontal Lumbar Motor
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Displays the current state of the horizontal lumbar motor.
- Vertical Lumbar Motor
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Displays the current state of the vertical lumbar motor.
- Seat Heat Sensor Value
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The scan tool displays the voltage level of the seat heat sensor signal circuit to the driver seat module. When the seat is cold the scan tool will display near 5 volts and as the seat temperature rises the signal voltage will decrease to near 0.0 volts.
- Julian Date of Build
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The scan tool displays the date upon which the seat module was manufactured.
- Manufacture Enable Counter (MEC)
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The scan tool displays the actual value for the MEC in the seat module. This information is for the assembly plant only.
- 8 Digit GM Part Number
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The scan tool displays the part number assigned to the seat module that is currently in the vehicle.
- Year Module Built
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The scan tool displays the year upon which the seat module was manufactured.
- Software Revision Number
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The scan tool displays the version of the software part number in the seat module.
- Software Part Number
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The scan tool displays the software identification number (ID) in the seat module.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.