Ford/Lincoln/Mercury Keyless Entry Module

Ford/Lincoln/Mercury Keyless Entry Module Troubleshooting Guide

Important: Use this guide if you reinstalled your repaired Ford/Lincoln/Mercury Keyless Entry Module and the problem is still happening.
Important: Please do not open/disassemble the module—use these vehicle-side checks only.

• Step 1: Confirm the exact symptom
  • Remote won’t lock/unlock
  • Remote works sometimes / short range
  • Locks cycle by themselves
  • Interior lights stay on / don’t come on
  • Horn chirp/alarm issues (if equipped)
• Step 2: Verify the remote itself
  • Confirm the fob battery is good and installed correctly
  • Try a second known-good remote if available
  • If you have multiple remotes and none work, focus on vehicle/module inputs
• Step 3: Confirm remote programming
  • If the remote was replaced, lost power, or the vehicle battery was disconnected, the remote may need to be re-learned
  • Verify the vehicle successfully enters programming mode and accepts each remote
• Step 4: Check fuses and power feeds
  • Check all fuses labeled KEM / Keyless / Locks / Interior lights / GEM / BCM / Courtesy
  • Use a meter/test light on both sides of the fuse (not visual-only)
• Step 5: Inspect the module connector(s)
  • Make sure connectors are fully seated/locked
  • Inspect for pushed-back terminals, bent pins, corrosion, moisture, or loose terminal fit
  • If wiggling the connector changes the symptom, suspect terminal tension or harness strain
• Step 6: Door lock system basics
  • If power door locks don’t work from the switch either, suspect vehicle-side power/ground, lock relays, or actuators (not the remote)
  • If switches work but remotes don’t, focus on programming/antenna/module communication
• Step 7: Receiver/antenna considerations
  • Poor range/intermittent operation can be caused by antenna/receiver issues or electrical noise
  • Check for aftermarket electronics (remote start/radio amps/chargers) tied into ignition or lock wiring
• Step 8: If the issue started after electrical work
  • Re-check anything recently touched: battery work/jump-starting, fuse/relay work, door wiring repairs, remote start installs
  • A loose connection or wrong fuse position can disable keyless functions