B2079 — driver's side airbag OFF lamp – short to positive supply

B2079: B2079 identifies a short to positive supply in the driver's side airbag OFF lamp circuit. The driver's side airbag OFF lamp remains illuminated when the lamp should be off.

For Ford vehicles

driver's side airbag OFF lamp – short to positive supply

vehicle

Is it safe to drive?

Airbag indication requires prompt service B2079 identifies a short to positive supply in the driver's side airbag OFF lamp circuit. The vehicle may still operate, but the displayed airbag status may be unreliable, so the fault should be diagnosed before relying on the restraint system.

Typical symptoms

The driver's side airbag OFF lamp remains illuminated when the lamp should be off.
The lamp illumination does not change correctly when the ignition or airbag selector is operated.
An SRS warning may be present alongside the B2079 code.
B2079 can remain stored in the SRS or body control module even after the lamp appears to operate normally.

Common causes

A chafed or damaged wire in the driver's side airbag OFF lamp harness is shorted to a positive supply circuit.
A crushed connector or improperly positioned terminal is bridging the lamp circuit to positive voltage.
Corrosion or trapped moisture inside the lamp connector has created a conductive path to the positive supply.
The driver's side airbag OFF lamp or its socket has an internal short to positive voltage.
An aftermarket installation or previous wiring repair has connected the lamp circuit to constant positive power.

How to diagnose with an OBD scanner

Inspect the lamp and connector Locate the driver's side airbag OFF lamp, socket, and associated wiring. Look for frayed insulation, pinched wires, water intrusion, green corrosion, loose terminals, or evidence of an aftermarket splice.
Perform safe circuit testing Follow the vehicle service instructions before disconnecting the battery or handling SRS wiring. With the lamp circuit isolated as directed, test the socket and harness for unintended positive-voltage continuity and verify that the wiring is not bridged to a constant power supply.
Check related power and ground circuits Confirm the integrity of the connector pins, positive-feed paths, and ground points serving the driver's side airbag OFF lamp circuit. Repair damaged terminals or corroded connectors before replacing the lamp.
Read B2079 with a scanner Connect an ELM327 adapter with AIScanAuto or another compatible OBD2 scanner, select the vehicle's SRS or body-control module if accessible, and read stored and pending codes. Record the B2079 freeze-frame information and compare the lamp command with the actual indicator state.
Repair and verify Repair the shorted wiring, replace a defective lamp or socket as needed, and restore any damaged factory splices. Clear B2079 with the scanner only after the repair, then verify the driver's side airbag OFF lamp behaves correctly and that the code does not return.

Approximate repair cost

A rough independent-shop estimate is USD $150-$600 for diagnosis, harness or connector repair, and possible lamp or socket replacement. These figures are estimates only and vary by region, vehicle, parts availability, and labor rate.

Common questions

What does B2079 specifically identify?

B2079 identifies a short to positive supply in the driver's side airbag OFF lamp circuit, preventing reliable lamp control and potentially causing the OFF lamp to illuminate incorrectly.

Can I keep driving with B2079 stored?

Driving may be possible, but the driver's side airbag OFF indication may be misleading. Prompt diagnosis is recommended so the lamp status and wiring fault can be verified.

Does B2079 mean the airbag has been disabled?

B2079 alone does not prove that the airbag is disabled. It identifies an electrical fault involving the driver's side airbag OFF lamp circuit, which should be tested directly.

Why does the code return after being cleared?

B2079 will return if the underlying short to positive supply remains in the lamp, connector, or wiring. The circuit must be repaired before the code is cleared and verified.

B2079 — B2079 — Manufacturer Controlled DTC: Causes, Symptoms & Fix

The engine control module logs B2079 when it encounters an electrical problem in the vehicle's body system that it cannot self-correct. This code falls under the manufacturer-controlled category, meaning the automaker — not a universal standard — defines exactly what conditions trigger the fault. Whenever the module sees a signal or component reading that stays outside the acceptable range for longer than the programmed threshold, it saves the code and illuminates the appropriate warning light on the dashboard.

The body electrical system manages a range of comfort and convenience features: power door locks, window motors, interior and exterior lighting, windshield wipers, and the switches and actuators that control them. The BCM constantly monitors voltage, ground, and signal circuits for all of these components while the vehicle is running. When a problem persists across enough consecutive drive cycles, the module locks in B2079 and captures freeze frame data — a snapshot showing engine RPM, load, coolant temperature, and vehicle speed the instant the fault occurred. That snapshot is the best starting point for any diagnosis.

In most cases, B2079 does not affect how the engine runs. The driver will most likely notice a warning light glowing on the instrument cluster and possibly an electrical feature that works intermittently or stops functioning altogether. The affected function varies depending on which circuit triggered the code — it could be the power locks, one of the windows, a lighting circuit, or the wiper motor.

Common Symptoms of B2079

The check engine light or a dedicated body system warning lamp is illuminated
The affected component — locks, windows, lighting, or wipers — operates intermittently or not at all
No noticeable impact on engine performance or drivability in most cases
The problem may come and go, especially if the fault is related to a loose connection or moisture intrusion

What Causes B2079?

Damaged wiring running through door jambs or areas prone to water exposure — these locations flex repeatedly and are vulnerable to corrosion and chafing
A failed or malfunctioning body control module (BCM) that no longer processes signals correctly
A blown fuse or faulty relay in the affected circuit
Corroded, loose, or unplugged electrical connectors — especially common at connection points that experience vibration or moisture

How to Diagnose B2079

Plug in an OBD2 scanner, retrieve code B2079, and record the freeze frame data. This shows the exact operating conditions — RPM, load, temperature, vehicle speed — when the fault was first detected.
Check for any related diagnostic trouble codes stored alongside B2079. Additional codes often point directly to the failing component or circuit.
Research manufacturer technical service bulletins for your specific make and model using your VIN — many B0xxx codes have published factory fixes, software updates, or known issues documented by the automaker.
Visually inspect the wiring harness and connectors tied to the body electrical system. Look for cracked insulation, exposed wires, corrosion buildup, and any signs of poor contact at plugs.
Operate the affected function while monitoring its switch and motor PIDs in the scanner's live data stream. This confirms whether the module is receiving the correct input and sending the expected output.
Clear the code, complete a full drive cycle that replicates the conditions from the freeze frame data, and verify that B2079 does not return.

Repair Options for B2079

Address the cheapest and most common causes before moving on to expensive components:

Switch or actuator replacement — $120–$450
BCM repair or replacement — $300–$900
Wiring harness or connector repair — $80–$250

Total Cost Breakdown

The final bill hinges entirely on which part is actually at fault. At independent shop rates in the United States, here is what you can expect to pay for parts and labor combined:

Replace the faulty switch or actuator: $120–$450
Repair or replace the BCM: $300–$900
Repair damaged wiring or connectors: $80–$250

All told, fixing B2079 typically runs between $80 and $900. Getting an accurate diagnosis before purchasing parts is the single best way to keep costs down — the BCM replacement scenario is the most expensive option and should be the last thing you consider, not the first.

Can You Drive with B2079?

B2079 is usually safe to drive since body electrical codes rarely impact engine operation or drivability. That said, there are a few exceptions worth keeping in mind. If the fault involves exterior lighting, your ability to see and be seen is compromised — especially dangerous at night or in poor weather. Inoperable wipers create a serious visibility problem during rain or snow. A central locking fault that leaves the doors unlocked presents a security risk. Address these situations promptly even if the engine runs perfectly fine.