Seat Lumbar/Bolster Pump
Table of contents
B392B GMC Possible Causes
- Faulty Seat Lumbar/Bolster Pump
- Seat Lumbar/Bolster Pump harness is open or shorted
- Seat Lumbar/Bolster Pump circuit poor electrical connection
- Faulty Seat Bolster Memory Control Module
How do I fix code B392B GMC?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the B392B GMC code
The cost of diagnosing the B392B GMC code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
B392B GMC Description
When a seat lumbar, bolster, or massage function is commanded ON, the Seat Bolster Memory Control Module applies battery voltage and a low side drive Pulse Width Modulated (PWM) signal through their respective control circuits to the seat lumbar/bolster pump. The logic in the pump interprets this signal and pump runs to inflate the lumbar/bolster bladders until the switch is released. The Diagnostic Trouble Code (DTC) sets when the Seat Bolster Memory Control Module detects a short to ground on the lumbar/bolster pump voltage control circuit.