B3921 Chevrolet Code - Group 2 Seat Motors Circuit Shorted
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
- B3921 Chevrolet indicates Group 2 Seat Motors Circuit Shorted.
- 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 B3921 Chevrolet 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 2 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 B3921 Chevrolet?
- 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
How to Fix the DTC B3921 Chevrolet?
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
B3921 02 Group 2 Seat Motors Circuit Shorted to Ground
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the B3921 Chevrolet 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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Frequently Asked Questions about B3921 Chevrolet Code
1. What are the common symptoms of OBDII code B3921 Chevrolet (Group 2 Seat Motors Circuit Shorted)?
- Common symptoms include non-functional seat motor operation, inability to adjust seat position, and potential illumination of the airbag warning light.
2. What are the possible causes of OBDII code B3921 Chevrolet?
- The code B3921 Chevrolet typically indicates a short circuit in the wiring of the Group 2 seat motors, a malfunctioning seat motor, or a faulty control module.
3. How can I diagnose the reason behind OBDII code B3921 Chevrolet?
- To diagnose the issue, you can start by inspecting the wiring harness for any visible damage or signs of a short circuit. Testing the seat motors and control module using a multimeter can help pinpoint the exact cause.
4. Is it safe to drive with OBDII code B3921 Chevrolet present?
- It is generally not recommended to drive with the B3921 code active, as it can affect the proper functioning of the seat motors, potentially leading to discomfort or safety hazards while driving.
5. What are the repair options for fixing OBDII code B3921 Chevrolet?
- Repair options may include repairing or replacing damaged wiring, replacing the faulty seat motor, or reprogramming the control module. Professional diagnosis and repair are recommended to ensure proper resolution.
6. Can I reset OBDII code B3921 Chevrolet without fixing the underlying issue?
- While clearing the code temporarily may turn off the warning light, the issue causing the code will persist. It is crucial to address the root cause to prevent further problems.
7. How can I prevent OBDII code B3921 Chevrolet from recurring?
- Regular maintenance and inspections of the seat motors and wiring harness can help prevent issues that trigger the B3921 code. Addressing any related concerns promptly can also prevent the code from reoccurring.
8. Is the repair for OBDII code B3921 Chevrolet covered under warranty?
- Depending on the vehicle's warranty coverage and the specific cause of the code, repairs for B3921 Chevrolet may be covered. Check with your dealership or warranty provider for confirmation.
9. Can a DIY enthusiast fix OBDII code B3921 Chevrolet at home?
- While some basic troubleshooting steps can be performed at home, repairing OBDII code B3921 often requires specialized tools and expertise. It is advisable to consult a professional mechanic for proper diagnosis and repair.
10. Will OBDII code B3921 Chevrolet cause my vehicle to fail an emissions test?
- The B3921 code is related to the seat motors and is unlikely to directly impact emissions. However, it is essential to address all codes before undergoing emissions testing to ensure overall vehicle health.
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