B1625 — Lamp Keypad Output Short Circuit To Battery #

The description of DTC B1625 may vary depending on the vehicle manufacturer (OEM). Always refer to your OEM documentation for the authoritative definition.

Known label variations:

• Lamp Keypad Output Short Circuit To Battery (Ford, Chrysler, GM)
• Keypad Lamp Output Circuit Short to Battery (Jeep)
• Keypad Lamp Output High (Dodge)

Summary of DTC B1625 #

DTC B1625 signals the detection of a short circuit to battery voltage in the keypad lamp output circuit. This means the circuit that controls illumination for the keypad (often found on keyless entry systems or electronic access panels) is receiving unexpected battery voltage, indicating a possible wiring or hardware fault. Modern vehicles use this monitoring to ensure both security and correct electrical operation of the access system. If this code is set, the keypad illumination may malfunction, and in rare cases, the keypad functionality itself could be affected. The code is typically set by the Body Control Module (BCM), which manages many of the vehicle’s convenience and security features.

Frequent Symptoms for code B1625 #

When B1625 is active, you may notice irregularities in your vehicle’s keypad lighting or access system. Though the vehicle may still function normally, these symptoms can be annoying or misleading, especially in low-light conditions.

• Keypad backlighting stays on at all times
• Keypad backlighting does not turn off with ignition cycle
• Keypad illumination is dim or flickers
• Keyless entry system may not respond or intermittently fails
• Battery drain (in rare, severe cases)
• Security warning lights on the dashboard

Most Probable Causes for code B1625 #

This DTC is most often triggered by electrical faults in the keypad lamp circuit. Prioritizing the most frequent issues will help speed up your diagnostic process.

1. Damaged wiring – Insulation wear or pinched wires causing a direct short to battery voltage
2. Faulty keypad assembly – Internal short circuit within the keypad’s lamp or its circuitry
3. Corroded or loose connectors – Moisture intrusion or vibration causing poor contacts
4. Body Control Module (BCM) fault – Rare, but possible if all other causes are ruled out

Step-by-step Diagnosis for code B1625 #

Accurate diagnosis of B1625 requires methodical inspection and testing. Use a digital multimeter, and always disconnect the battery before probing connectors or wiring.

• 1. Verify the code – Clear all codes, operate the keypad, and see if B1625 returns.
• 2. Inspect the keypad – Check for physical damage, moisture, or corrosion.
• 3. Check wiring harness – Examine the wiring between the keypad and BCM for pinched, broken, or shorted wires.
• 4. Test keypad lamp output circuit – With ignition off, use a multimeter to check for voltage at the keypad lamp wire. Voltage here suggests a short to battery.
• 5. Inspect connectors – Unplug connectors at the keypad and BCM. Look for bent pins, corrosion, or water intrusion.
• 6. Test the keypad unit – Substitute with a known good keypad if possible, or bench-test the suspected keypad for internal shorts.
• 7. Check BCM operation – If all wiring and hardware test fine, the BCM may require further diagnosis or replacement.

Possible Repairs for code B1625 #

Repairs should directly address the root cause identified during diagnosis. It’s important not to simply clear the code without correcting the underlying issue, or you risk recurrence and possible electrical damage.

• Repair or replace damaged wiring (section and solder, use OEM-quality insulation)
• Replace the keypad assembly if an internal fault is confirmed
• Clean or replace corroded connectors; apply dielectric grease to prevent future corrosion
• Secure and reroute harness if pinched or exposed to sharp edges
• Replace or reprogram the BCM if it is determined to be at fault (rare)

Is it safe to drive with code B1625? #

Yes, but with limitations. DTC B1625 does not directly affect engine or drivetrain operation, so you can continue driving. However, be aware that your keypad or keyless entry lighting may not function properly, which can be inconvenient or compromise security. In extreme cases, persistent battery draw from a shorted circuit could lead to battery drain, so timely repair is advised.

Vehicles most commonly affected by B1625 #

While this code can appear on various OEMs, it is most frequently reported on vehicles equipped with electronic keypads for entry, particularly those from North American manufacturers.

• Ford (Fusion, Explorer, F-150, Expedition)
• Lincoln (MKX, Navigator)
• Jeep (Grand Cherokee, Commander with keyless entry keypad)
• Chrysler and Dodge models with optional keypad systems
• Some GM models equipped with accessory keypads

Always consult your vehicle’s service documentation for exact circuit layout and code definitions.

Common Mistakes & Best Practices for code B1625 #

Avoiding misdiagnosis and unnecessary parts replacement is key when dealing with DTC B1625. Here’s what to watch out for:

• Assuming the keypad itself is always the problem—wiring is a more common culprit.
• Overlooking connector corrosion, especially if the vehicle is exposed to moisture.
• Clearing the code without verifying the repair—this often leads to repeat failures.
• Skipping a visual inspection before replacing expensive modules.
• Not using OEM wiring diagrams for proper pin identification and circuit tracing.

Quick FAQ for code B1625 #

Got questions? Here are some rapid answers to the most common queries about B1625.

• Q: Can a blown fuse cause B1625?
  A: Unlikely. B1625 points to a short to battery (too much voltage), not an open circuit. Still, always check fuses as part of your diagnostic process.
• Q: Will B1625 trigger the check engine light?
  A: No, this code is stored in the body or security module, not the engine control module. You may see a security or service warning instead.
• Q: Can a BCM reflash fix this code?
  A: Only if the root cause is a software bug or logic error. Most cases involve physical faults in wiring or hardware.