OBD Guide

B3921

Group 2 Seat Motors Circuit Shorted

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Group 2 seat adjustment does not work
  • Burnt smell coming from under the seat
  • Fuses blow

Causes

  • Wiring harness damage
  • Seat motor malfunction
  • Short circuit in the control unit
  • Contact corrosion

How to Fix

  1. Check wiring harness for damage
  2. Test seat motors
  3. Inspect the control unit for short circuits
  4. Replace damaged components

Related codes

Error B3921 by Vehicle Brand