B1625 — Lamp Keypad Output Short Circuit To Battery

Is it safe to drive with B1625?

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 B1625 myself?

Start with a scan: confirm B1625, 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.

What does OBD2 code B1625 mean?

OBD2 code B1625 flags a problem with the body electrical system (lamp keypad output short circuit to battery). The car is usually drivable while you plan the repair. Common culprits: faulty switch, motor or actuator of the affected system, corroded or loose connectors, body control module (BCM) fault.

What is the most common cause of B1625?

The most common causes are: faulty switch, motor or actuator of the affected system, corroded or loose connectors, body control module (BCM) fault.

What are the symptoms of B1625?

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.

When your vehicle's body control module detects a problem with the keypad illumination circuit, it logs trouble code B1625 — specifically identifying a short circuit where the lamp keypad output is being fed battery voltage when it shouldn't be. This code falls squarely in the body electrical category, meaning the issue lives in the switches, lights, and associated wiring that handle comfort and convenience features rather than anything related to the engine or drivetrain.

The affected module doesn't wait passively for you to bring the car in for service. It runs self-diagnostics continuously while you drive, polling the keypad illumination circuit and comparing actual voltage readings against the expected parameters. When those readings stray outside acceptable limits for more than a few drive cycles, the module locks in B1625 and illuminates the warning light on your dash. At that moment, the module also captures freeze frame data — a snapshot of engine RPM, load, temperature, vehicle speed, and other sensor values that existed when the fault first appeared. That snapshot becomes your most valuable starting point when you finally hook up a scan tool.

Typical symptoms of B1625

• The check engine or body system warning light stays on after startup
• Engine performance remains unaffected in the vast majority of cases
• The specific function tied to the keypad — typically interior lighting, window switches, door locks, or wiper controls — operates erratically or stops working entirely
• The affected component may flicker briefly before failing completely
• Symptoms often worsen in wet weather or high humidity due to moisture intrusion
• In some vehicles, multiple interior illumination features dim or extinguish simultaneously

What triggers code B1625?

The root causes generally fall into five categories, listed here from most to least frequently encountered:

• A failed switch or actuator in the affected circuit — the component itself shorts internally and feeds stray voltage where it doesn't belong
• Wiring damage in door jambs, kick panels, or other areas exposed to moisture and flexing — these zones suffer repeated bending stress and water splash
• A blown fuse or malfunctioning relay that allows battery voltage to backfeed into the keypad circuit
• Corroded, loose, or partially disconnected connectors that create intermittent short conditions
• A faulty body control module that misinterprets normal voltage as an abnormal condition or fails to regulate the circuit properly

Diagnosing B1625 step by step

Before replacing any expensive components, work through this systematic process to pinpoint the actual failure:

1. Plug in an OBD2 scanner, retrieve B1625, and record the freeze frame data — note the exact conditions (RPM, load, temperature, speed) captured when the fault occurred.
2. Check for any other stored codes that might point to a common failure point. Then search manufacturer technical service bulletins for your specific make, model, and year — many body electrical codes have documented factory fixes or software calibrations.
3. Perform a thorough visual inspection of all wiring and connectors associated with the keypad illumination circuit, looking for damaged insulation, corrosion buildup, rubbed-through wires, or loose-fitting terminals.
4. Access live data on your scan tool and operate the suspected switch or control while monitoring voltage and current PIDs — abnormal readings confirm which side of the circuit has failed.
5. Pay close attention to flex points where wires pass through door jambs and tailgate hinges; these areas crack first from repeated motion.
6. Clear B1625, complete a full drive cycle including conditions similar to the freeze frame, and verify the code does not reappear before declaring the repair complete.

Repair options and costs

Always address the cheapest probable causes before committing to major component replacement:

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

A complete repair for B1625 typically runs between $80 and $900 depending on which part actually failed. Most cases involve nothing more than repairing frayed wires or cleaning corroded connectors — simple work that stays on the lower end of the estimate. BCM replacement, while occasionally necessary, represents the least likely scenario and should only be considered after all other possibilities have been ruled out.

Is it safe to drive with B1625?

You can continue driving in most situations since body electrical faults rarely compromise engine operation or safety systems. However, two exceptions warrant attention: if the keypad controls exterior lighting or windshield wipers, you lose visibility aids during inclement weather. If the fault involves central locking, you risk being unable to secure the vehicle properly. In those cases, address the repair promptly rather than waiting for the problem to worsen.

Related OBD2 codes

• B1600: PATS Ignition Key Transponder Signal Is Not Received
• B1601: PATS Received Incorrect Key-Code From Ignition Key Transponder
• B1602: PATS Received Invalid Format Of Key-Code From Ignition Key Transponder
• B1603: Lamp Anti-Theft Indicator Circuit Failure
• B1604: Lamp Anti-Theft Indicator Circuit Open
• B1605: Lamp Anti-Theft Indicator Circuit Short To Battery