B1424 — Power Window RR Motor Circuit Short To Battery

What does OBD2 code B1424 mean?

Power Window RR Motor Circuit Short To Battery (B1424): a body electrical fault affecting the body electrical system. The car is usually drivable while you plan the repair. Most often caused by corroded or loose connectors, blown fuse or failed relay, damaged wiring in door jambs or wet areas.

Is it safe to drive with B1424?

Usually safe to drive — body codes rarely affect drivability. Exceptions: exterior lighting and wipers in bad weather, and central locking faults that can leave the car unsecured.

How do I diagnose B1424 myself?

Start with a scan: confirm B1424, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the body electrical system, and verify the suspect component against live data before buying parts.

Will B1424 clear itself?

Sometimes B1424 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

How much does it cost to fix B1424?

Replace the switch or actuator — $120–$450; Repair wiring or connectors — $80–$250; BCM repair or replacement — $300–$900. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

When your vehicle's onboard computer detects that the right rear power window motor is receiving voltage from an unintended source, it logs OBD2 trouble code B1424. The abbreviation tells you everything: the B prefix marks it as a body system code, 1424 is the specific identifier for a short-to-battery condition on the rear power window motor circuit. In plain terms, the circuit is getting power from the battery when it should be switched on and off only by the window switch. The body control module continuously watches this circuit while the vehicle runs, and once readings stray outside the normal range for long enough, the module locks in the fault, turns on the warning light, and saves a freeze frame snapshot. That snapshot records engine speed, load, temperature, and vehicle speed at the exact moment B1424 was triggered — essential information for anyone working through the diagnosis methodically.

The rear power window mechanism depends on a properly coordinated circuit: the switch sends a ground signal, the motor receives battery voltage through its supply wire, and the BCM verifies current flow matches expectations. When a short to battery develops somewhere along this path, the BCM sees abnormal voltage and interprets it as a fault. The short can live inside a switch, in the motor windings, in damaged insulation on the wiring, or in the connectors that link the door harness to the body. No matter where it hides, the result is the same — the module flags B1424 and the window stops responding correctly or stops responding entirely.

Symptoms of B1424

• The check-engine or body warning light stays illuminated on the instrument cluster
• The right rear window does not move when you press the switch, or it moves sluggishly
• The window operates in only one direction (up or down) regardless of switch position
• Intermittent operation — the window works some days and fails others, often worse after rain or high humidity
• No effect on engine performance, transmission operation, or other vehicle controls in most cases
• In rare instances, other windows on the same door circuit share the same glitch

Common Causes

• Corrosion or loose pins inside the window switch connector — moisture works into the connector over time, creating high resistance or outright short circuits
• Chafed or broken wiring inside the door jamb — the door opening and closing flexes the harness; insulation eventually cracks, exposing wires
• Failed window switch — contacts wear out or internal circuitry breaks down, producing spurious voltage signals the BCM interprets as a short
• Defective rear window motor — internal windings can short to the motor case or adjacent circuits
• Water intrusion into the door panel — pooled water at the bottom of the door shell attacks connectors and wire insulation
• Faulty body control module — rarely the cause, but the BCM can misinterpret valid signals if its internal circuitry is damaged

How to Diagnose B1424

1. Connect an OBD2 scan tool and confirm B1424 is present in the body control module. Record the freeze frame data alongside the code — those readings tell you whether the fault appeared at idle, highway speed, or cold start.
2. Pull all stored codes from every module on the vehicle. Related P0xxx, C0xxx, or B0xxx codes often point directly to the failing component. Also search for TSBs (technical service bulletins) on your exact make, model, and model year — manufacturers sometimes publish software updates or known-fix campaigns for these codes.
3. Physically inspect the window switch. Remove it from the door panel and look for burn marks, bent terminals, or moisture residue. Clean corrosion from the connector and test the switch with a multimeter for correct resistance values.
4. Examine the door wiring harness at the flex point where the door skin meets the body. Open and close the door while looking closely — chafed wires often reveal themselves only under motion. Pull back the protective loom and check each conductor for breaks or pinched sections.
5. Monitor live data while operating the window. With the scan tool or multimeter connected to the motor supply circuit, activate the switch. Voltage should appear only during switch activation. Constant voltage indicates a hard short; no voltage under load points to an open circuit or motor failure.
6. Clear B1424 after repairs and drive the vehicle through conditions matching the freeze frame data. Verify the light stays off and the window responds correctly before considering the job complete.

Repair Options and Costs

Prices below reflect typical parts and labor at an independent shop in the United States.

Total Cost to Fix B1424

Depending entirely on which part is actually at fault, B1424 repairs typically run between $80 and $900. The cheapest fix is usually a corroded connector cleaned or re-pinned; the most expensive is a BCM replacement. The smart approach is to confirm the bad part with testing before buying anything. Swapping expensive modules on guesswork is a fast way to blow past the lower end of that range without solving the problem.

Can You Drive with B1424?

Yes — B1424 carries a short severity rating. The fault lives entirely in the body electrical system and does not interfere with the engine, transmission, brakes, or steering. Your right rear window simply will not work, which is inconvenient but not a safety hazard. The one exception is if the short affects shared wiring that also feeds the central locking system, which could leave the vehicle unsecured. In that scenario, have it checked sooner rather than later. Otherwise, schedule the repair at your convenience.

Related OBD2 Codes

• B1400: Driver Power Window One Touch Window Relay Circuit Short To Battery
• B1401: Driver Power Window One Touch Window Relay Circuit Short To Ground
• [B1402: Driver Power Window Down Switch Circuit Failure](https://aiscanauto