B3920 Pontiac Code - Seat Motors Group 1 Common Circuit
Quick Answer
The Seat Memory Control Module controls the seat, lumbar, and adjustable pedal motors via half bridges that are connected to power rails internal to the module. Common causes include Faulty Seat, Lumbar, or Adjustable Pedal Motors, Seat, Lumbar, or Adjustable Pedal Motors harness is open or shorted, Seat, Lumbar, or Adjustable Pedal Motors circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- B3920 Pontiac indicates Seat Motors Group 1 Common Circuit.
- Common causes
- Common causes include Faulty Seat, Lumbar, or Adjustable Pedal Motors, Seat, Lumbar, or Adjustable Pedal Motors harness is open or shorted, Seat, Lumbar, or Adjustable Pedal Motors circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code B3920 Pontiac Description
When a power seat, lumbar, or adjustable pedal switch is pressed or when a memory recall is requested, each seat motor receives battery voltage and ground from the seat memory control module via the motor control circuits. All motors are reversible, so the direction the motor rotates depends on which control circuit voltage is applied and which control circuit ground is applied. When the switch is operated in the opposite direction, the module reverses the polarity and applies voltage and ground to the opposite circuits to move the seat in the opposite direction.
The Diagnostic Trouble Code (DTC) sets when the voltage on any power rail 1 motor control circuit exceeds 2.78 volts for 100 ms or is below 1.47 volts for 100 ms.
What are the Possible Causes of the DTC B3920 Pontiac?
- Faulty Seat, Lumbar, or Adjustable Pedal Motors
- Seat, Lumbar, or Adjustable Pedal Motors harness is open or shorted
- Seat, Lumbar, or Adjustable Pedal Motors circuit poor electrical connection
- Faulty Seat Memory Control Module
How to Fix the DTC B3920 Pontiac?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
B3920 02 Group 1 Seat Motors Circuit Shorted to Ground
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B3920 Pontiac code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
Need more information about the B3920 Pontiac code?
Need more information on how to fix the B3920 Pontiac code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the B3920 Pontiac code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about B3920 Pontiac Code
1. What does the OBDII code B3920 mean on a Pontiac?
B3920 indicates a problem with the Seat Motors Group 1 Common Circuit, typically involving electrical issues in the seat adjustment motor system.
2. What are the common symptoms of the B3920 code?
Symptoms include inoperative or malfunctioning power seat adjustments, unusual noises from the seat motors, or intermittent seat movement.
3. What causes the B3920 code to appear?
Common causes include damaged wiring, a faulty seat motor, a blown fuse, or a malfunctioning seat control module.
4. How can I diagnose the B3920 code?
Inspect the seat motor wiring for damage, check the fuses related to the power seat system, and test the seat control module and motor for proper operation.
5. Can I still drive my Pontiac with the B3920 code?
Yes, the code doesn't affect drivability, but it may prevent proper seat adjustments, potentially impacting comfort or driving ergonomics.
6. How do I fix the B3920 code on my Pontiac?
Repairs may involve replacing damaged wiring, fixing loose connections, replacing the seat motor, or reprogramming or replacing the seat control module.
7. How much does it cost to repair the B3920 code?
Repair costs vary but typically range from $100 to $500, depending on whether the issue is a simple wiring fix or a component replacement.
8. Can I clear the B3920 code without fixing the issue?
Clearing the code with a scanner may temporarily remove it, but it will likely return if the underlying issue isn’t resolved.
9. Does the B3920 code affect all Pontiac models the same way?
The code specifics may vary slightly by model, but it generally pertains to the seat motor circuit across Pontiac vehicles equipped with power seats.
10. Is the B3920 code a common issue in Pontiacs?
While not extremely common, this code can occur due to wear and tear on seat components or electrical issues in older Pontiacs.
Discuss the causes and fixes for B3920 Pontiac OBDII Code
Code B3920 Pontiac comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
