B1524 — Keyless Entry Circuit Open

What is the most common cause of B1524?

The most common causes are: faulty switch, motor or actuator of the affected system, damaged wiring in door jambs or wet areas, corroded or loose connectors.

Will B1524 clear itself?

Sometimes B1524 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.

What are the symptoms of B1524?

Drivers most often notice: warning light on the dashboard, no impact on engine operation in most cases, the affected function (locks, windows, lighting, wipers) works intermittently or not at all.

How much does it cost to fix B1524?

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

Is it safe to drive with B1524?

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.

Pull up B1524 on your scan tool and you're looking at a body electrical problem. Specifically, the module has detected an open circuit in the keyless entry system — meaning the electrical path is broken somewhere and current cannot flow where it should. This falls under the B-codes, which cover body and chassis electrical faults rather than powertrain issues.

The keyless entry module constantly watches the voltage and resistance values in its circuit. When readings fall outside acceptable parameters for a defined number of drive cycles, the module logs B1524 and typically illuminates a warning light. An open circuit usually means a severed wire, a connector that has backed out or developed corrosion, a blown fuse, or a failed component inside the keyless entry assembly itself.

The freeze frame data stored alongside B1524 is worth examining carefully. It captures engine rpm, load, temperature, and vehicle speed at the exact moment the fault occurred. That snapshot tells you what conditions triggered the code — and guides your inspection from there.

Common symptoms of B1524

• Dashboard warning light is illuminated
• Engine performance remains unaffected in most vehicles
• The affected component — locks, windows, lighting, or wipers — operates intermittently or fails completely
• The module cannot command the system because the circuit is incomplete
• Remote key fob may still function if the fault lies downstream of the receiver

What causes B1524?

• Broken wire in the keyless entry harness, especially near door jambs where flexing breaks conductors
• Blown fuse feeding the keyless entry circuit
• Internally failed keyless entry module or receiver
• Connector unplugged, pins backed out, or heavy corrosion on terminals
• Corroded or loose ground connections feeding the circuit
• Wiring damaged by moisture intrusion in door sills or hatch areas
• Body control module (BCM) itself is faulty or lost communication
• Failed relay or faulty switch, motor, or actuator on the affected circuit

How to diagnose B1524

1. Connect an OBD2 scanner and confirm B1524 is stored. Save the freeze frame data — it shows engine conditions when the fault appeared, and that context matters for recreating the failure.
2. Pull any related codes. Multiple body codes appearing together often point to a shared supply or ground issue. Check manufacturer TSBs for your make and model — many B-code patterns have known root causes or software fixes.
3. Visually inspect the wiring harness and connectors tied to the keyless entry system. Look for chafing, melted insulation, corrosion, and loose terminals.
4. Test continuity on the keyless entry circuit end-to-end with a multimeter. Wiggle the harness during the test — intermittent opens will show as fluctuating resistance readings.
5. Monitor live data for the affected function's switch and motor PIDs while operating the controls. This tells you whether the BCM is receiving input and attempting output.
6. Pay close attention to flex points: door jambs, liftgate hinges, and anywhere wires bend repeatedly. These spots break first.
7. Clear the code and drive the vehicle through a complete cycle that includes the freeze frame conditions. Confirm B1524 does not return before calling the repair complete.

How to fix B1524

Address the cheapest and most common failures before replacing expensive control modules. Wiring repairs and connector cleaning run $80–$250. Replacing a failed switch, actuator, or keyless entry receiver typically costs $120–$450. If the BCM itself is faulty, expect to spend $300–$900 for repair or replacement.

How much does it cost to fix B1524?

The final bill depends entirely on what caused the open circuit. Here are typical scenarios at independent shop rates in USD:

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

In most cases, B1524 stems from a simple wiring or connector problem rather than a failed module. A thorough diagnosis before purchasing parts keeps total cost near the lower end of that range. The BCM is the most expensive component and should be tested last.

Can you drive with B1524?

B1524 generally does not affect your ability to drive. Engine operation and transmission function remain normal. The real concern depends on which system is affected by the open circuit. If it is the remote unlock receiver, you lose convenience but lose nothing essential. If the fault involves exterior lighting or wiper motors, have it fixed before driving in adverse conditions. A central locking circuit failure that prevents you from securing the vehicle is a security risk worth addressing promptly.

Related OBD2 codes

• B1500: Lamp Turn Signal Left Circuit Open
• B1501: Lamp Turn Signal Left Circuit Short To Battery
• B1502: Lamp Turn Signal Left Circuit Short To Ground
• B1503: Lamp Turn Signal Right Circuit Failure
• B1504: Lamp Turn Signal Right Circuit Open
• B1505: Lamp Turn Signal Right Circuit Short To Battery