◆OBD Codes

B0100

HVAC Blower Motor Circuit Malfunction

Moderateelectrical

Overview

The B0100 code indicates that the body control module has detected a hvac blower motor circuit malfunction condition. This relates to the vehicle's body electrical systems, which control comfort, convenience, and safety features. When this code is stored, the affected system or component may not operate correctly, potentially impacting safety or comfort features.

Symptoms

  • Horn not working when pressed
  • Seatbelt warning chime not functioning
  • Turn signals flashing rapidly or not at all
  • SRS indicator light stays on or flashes

Common Causes

  • Faulty body control module (BCM)
  • Short circuit in wiring
  • Corroded or damaged wiring harness connectors
  • Blown fuse or faulty relay

Diagnosis Steps

  1. 1Connect an OBD-II scanner and read all stored body control module trouble codes
  2. 2Inspect the affected circuit fuse and relay; replace if blown or faulty
  3. 3Check the wiring harness and connectors for damage, corrosion, or loose pins
  4. 4Test circuit voltage and ground with a multimeter at the affected component
  5. 5Verify battery voltage is within specification (12.4V+ engine off)

Estimated Repair Cost

$75 — $800

Cost varies by vehicle, location, and repair shop. Includes parts and labor.

Commonly Affected Vehicles

Hyundai SonataHonda AccordBMW 3 SeriesKia Forte

Related Codes

B0039B0023B0128

More Electrical Codes

B0001Driver Frontal Airbag Deployment Loop Circuit Open
Critical
B0002Driver Frontal Airbag Deployment Loop Circuit Short to Ground
Critical
B0003Driver Frontal Airbag Deployment Loop Circuit Short to Battery
Critical
B0004Driver Frontal Airbag Deployment Loop Resistance Too High
Critical
B0005Driver Frontal Airbag Deployment Loop Resistance Too Low
Critical
B0006Passenger Frontal Airbag Deployment Loop Circuit Open
Critical

Frequently Asked Questions

Driving with the airbag warning light on means the SRS system may not deploy in a crash, which significantly increases injury risk. Have the system inspected as soon as possible.