B3920 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 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 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?
- 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?
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 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.
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Information for Specific Makes
- B3920 Buick — Seat Motors Group 1 Common Circuit
- B3920 Cadillac — Seat Motors Group 1 Common Circuit
- B3920 Chevrolet — Seat Motors Group 1 Common Circuit
- B3920 GMC — Seat Motors Group 1 Common Circuit
- B3920 Pontiac — Seat Motors Group 1 Common Circuit
- B3920 Saturn — Seat Motors Group 1 Common Circuit
Frequently Asked Questions about B3920 Code
1. What are the common symptoms of OBDII code B3920 related to Seat Motors Group 1 Common Circuit?
- Common symptoms include non-responsive seat motors, inability to adjust seat position, and erratic movement of the seat.
2. What are the possible causes of OBDII code B3920 Seat Motors Group 1 Common Circuit?
- Possible causes may include faulty seat motor, damaged wiring or connectors, blown fuse, or a malfunctioning control module.
3. How can I diagnose OBDII code B3920 for Seat Motors Group 1 Common Circuit?
- Diagnosis involves inspecting the seat motors, checking the wiring and connectors for damage, testing the control module, and verifying fuse integrity.
4. What are some repair tips for fixing OBDII code B3920 related to Seat Motors Group 1 Common Circuit?
- Repair tips include repairing or replacing faulty seat motors, repairing damaged wiring or connectors, replacing blown fuses, and reprogramming or replacing the control module if necessary.
5. Can I drive my vehicle with OBDII code B3920 Seat Motors Group 1 Common Circuit?
- It is not recommended to drive the vehicle with this code as it may affect the functionality of the seat adjustment, posing a safety risk.
6. How much does it typically cost to repair OBDII code B3920 Seat Motors Group 1 Common Circuit?
- The cost of repair can vary depending on the specific cause of the code, but it may range from a few hundred dollars for minor repairs to over a thousand dollars for more extensive issues.
7. Is OBDII code B3920 Seat Motors Group 1 Common Circuit a common issue in vehicles?
- This code can be relatively common in vehicles with power-operated seats, especially in older vehicles or those with high mileage.
8. Can resetting the OBDII system clear the B3920 code related to Seat Motors Group 1 Common Circuit?
- Resetting the OBDII system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear.
9. Are there any preventive maintenance steps to avoid OBDII code B3920 Seat Motors Group 1 Common Circuit?
- Regularly inspecting and maintaining the seat motors, wiring, and connectors can help prevent issues that may trigger this OBDII code.
10. Can a DIY enthusiast fix OBDII code B3920 Seat Motors Group 1 Common Circuit at home?
- Depending on the specific cause of the code, some DIY enthusiasts with automotive repair experience may be able to diagnose and repair the issue at home.
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