What Does B1982 Mean?
This code indicates the Body Control Module (BCM) has detected a fault in the driver's door unlock relay circuit. The BCM monitors the relay coil and contact circuits for proper voltage, current draw, and response when commanded to unlock the driver's door. The failure could be an open circuit, short circuit, excessive resistance, or relay mechanical failure preventing proper operation of the door lock actuator.
Common Causes
35%
Failed or stuck driver's door unlock relay with burned contacts or open coil winding
25%
Corroded or loose relay socket terminals creating high resistance or intermittent connection
20%
Damaged wiring harness or corroded connector pins between BCM and unlock relay
15%
Faulty driver's door lock actuator motor drawing excessive current causing relay protection
5%
Failed Body Control Module with internal relay driver circuit fault
Diagnostic Steps
1
Locate the driver's door unlock relay in the power distribution center or fuse box, visually inspect for signs of overheating, melted plastic, or corrosion on relay and socket terminals
2
Remove the unlock relay and use a multimeter to test relay coil resistance (typically 70-100 ohms) across control terminals and check for continuity across load terminals when applying 12V to coil
3
With relay removed, check for battery voltage at relay socket power supply terminal with key on, then monitor BCM ground and control signal terminals while commanding door unlock function using scan tool actuator tests
4
Inspect all connectors in the door lock circuit for corrosion, pushed-back pins, or water intrusion, paying special attention to BCM connector and in-door harness connections at door jamb flex point
5
Disconnect driver's door lock actuator connector and measure actuator motor resistance (typically 2-5 ohms) and current draw when applying 12V directly to verify motor is not binding or drawing excessive amperage
6
Clear codes, reinstall or replace components as necessary, perform actuator function test through scan tool, and cycle door locks 10-15 times to verify repair and confirm code does not return
Estimated Repair Cost
$75 - $450
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected a fault in the driver's door unlock relay circuit. The BCM monitors the relay coil and contact circuits for proper voltage, current draw, and response when commanded to unlock the driver's door. The failure could be an open circuit, shor...
The most common cause of B1982 (Driver's Door Unlock Relay Circuit Failure) is: Failed or stuck driver's door unlock relay with burned contacts or open coil winding
Typical repair costs for B1982 range from $75 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving as this is a convenience feature failure that does not affect vehicle operation or safety systems. The door may need to be unlocked manually with the key or from inside the vehicle until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1982 to identify the root cause.
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Quick Info
Category
Body
System
Body Control and Door Lock System
Difficulty
Type
Manufacturer
Recommended Tools
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