B1624 — Lamp Keypad Output Open Circuit #

Note: The description of DTC B1624 may vary depending on the vehicle manufacturer. Always refer to the OEM (Original Equipment Manufacturer) service information for your specific vehicle.

• B1624 Keypad Backlight Output Open Circuit (Ford)
• B1624 Keypad Illumination Output Open (Chrysler)
• B1624 Keypad Lamp Circuit Open (General Motors)

Summary of DTC B1624 #

The B1624 – Lamp Keypad Output Open Circuit code indicates that the vehicle’s body control module (BCM) or a related controller has detected an open electrical circuit in the output wiring or connection to the keypad illumination lamp. The keypad, commonly found in some vehicles for keyless entry or security functions, uses a small lamp to illuminate its buttons for better visibility. If the circuit to this lamp is disrupted—by a broken wire, poor connection, or failed component—the BCM logs this fault. While this code typically does not impact drivability, it signals an issue with accessibility or convenience features that may require attention, especially in low-light conditions.

Frequent Symptoms for Code B1624 #

When B1624 is triggered, you’ll usually notice symptoms related to the keypad’s visibility or functionality. These symptoms rarely affect vehicle operation, but can impact user experience, especially at night or in dim environments. Here are the most common signs:

• Keypad backlighting does not work
• Keypad buttons are hard to see in the dark
• No response from keypad lamp when vehicle is unlocked or opened
• No other warning lights or driveability issues

Probable Causes for Code B1624 #

The B1624 code is typically set when the control module detects an open (broken) circuit in the keypad lamp wiring or related components. Causes, ranked from most common to least common, include:

1. Damaged or disconnected keypad lamp wiring harness
2. Corroded or loose wiring connector at the keypad or BCM
3. Failed keypad lamp (burned out bulb/LED)
4. Faulty keypad assembly
5. Defective Body Control Module (rare)

Step-by-Step Diagnosis for Code B1624 #

Diagnosing B1624 involves a systematic approach to identify where the open circuit or fault lies. Here’s a step-by-step process you can follow:

• 1. Scan for Additional Codes: Use a scan tool to check for other related DTCs. Address those first if present.
• 2. Visual Inspection: Inspect the keypad and its illumination for obvious damage.
• 3. Check the Wiring: Locate the keypad lamp wiring harness and inspect for cuts, breaks, or corrosion.
• 4. Test the Keypad Lamp: Using a multimeter, check for continuity in the lamp circuit.
• 5. Inspect Connectors: Unplug connectors at both the keypad and BCM, look for bent pins, corrosion, or loose connections.
• 6. Test BCM Output: Use a wiring diagram to confirm the BCM is sending output voltage when the lamp should be on.
• 7. Replace Components as Needed: Based on findings, replace the faulty lamp, wiring, keypad, or (rarely) the BCM.

Possible Repairs for Code B1624 #

Resolving B1624 depends on the specific cause identified during diagnosis. Most repairs are straightforward and involve restoring circuit continuity. Typical solutions include:

• Repairing or replacing damaged wiring or connectors
• Replacing a burned out keypad lamp or faulty LED assembly
• Cleaning or tightening corroded electrical connections
• Replacing the entire keypad assembly if internal failure is found
• Replacing or reprogramming the BCM (rare, only if confirmed faulty)

Can You Drive with Code B1624? #

Yes, you can drive with code B1624 present. This fault is not related to engine management, safety systems, or core vehicle operation. However, the keypad illumination may not function, potentially making it difficult to see or use the keypad in low-light conditions. If you rely on the keypad for entry or security, address this fault promptly to restore full convenience.

Vehicles Most Commonly Affected by Code B1624 #

While B1624 may appear on a variety of vehicles equipped with illuminated keypads, it is most commonly reported on certain makes and models where keypad entry systems are standard or optional. The list below highlights vehicles frequently associated with this code:

• Ford: Explorer, F-150, Expedition, Taurus (keypad entry equipped)
• Lincoln: Navigator, MKC, MKZ (with illuminated keypads)
• Chrysler: Town & Country, 300 (keypad security option)
• General Motors: Select SUVs and trucks with keypad entry

Common Mistakes & Best Practices for Code B1624 #

Misdiagnosis can lead to unnecessary part replacements or unresolved issues. To avoid common pitfalls, keep these best practices in mind:

• Do not assume the keypad assembly is faulty without testing wiring and lamp first.
• Avoid replacing the BCM unless all other diagnostics confirm it is the root cause.
• Always use an OEM wiring diagram to trace circuits correctly.
• Carefully inspect connector pins for corrosion or looseness before replacing parts.
• Reset the fault code after repairs and verify keypad illumination operation.

Quick FAQ for Code B1624 #

Here are quick answers to the most common questions about B1624 – Lamp Keypad Output Open Circuit:

• Q: Will B1624 trigger a check engine light?
  A: No. This code is stored in the body control system, not the engine control module. You’ll usually see a message in the BCM or security module, not the dashboard check engine light.
• Q: Can I fix B1624 myself?
  A: If you’re comfortable with basic electrical troubleshooting, you can often repair this by checking and fixing any broken wires or replacing the keypad lamp. If in doubt, consult a qualified technician.