LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Honda >> 2012 >> Insight Base >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Keyless/Power Door Locks/Security System >> Symptom Troubleshooting Index >> Power Door Locks/Keyless
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Power Door Locks/Keyless

  1. Check for B-CAN DTCs. If any B-CAN DTCs are indicated, refer to the B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ), and troubleshoot the indicated DTC(s) first.
  2. If the door lock system and the keyless operation do not work, troubleshoot the door locks first.
    NOTE: Security and keyless operation do not function when the ignition switch is ON (II).
Symptom Check Items
The security system sounds randomly while the doors are locked. Tripped sensor history (see TRIPPED SENSOR HISTORY  )
All the doors will not lock or unlock."
  • Poor ground (G501, G502)
  • Driver's door key cylinder switch test (see REAR DOOR  )
  • Door switch test (check the door switch ON/OFF information with the HDS)
  • Door lock switch test (check the door switch ON/OFF information with the HDS)
  • MICU input test (see MICU INPUT TEST  )
  • Door lock actuator test (see DOOR LOCK ACTUATOR TEST  )
Driver's and left rear doors will not lock or unlock.
  • Poor ground (G501, G502)
  • Blown No. 27 (30 A) fuse in the under-dash fuse/relay box
  • Blown No. 36 (15 A) and/or No. 50 (15A) fuse in the under-dash fuse/relay box
  • MICU input test (see MICU INPUT TEST  )
  • Door lock actuator test (see DOOR LOCK ACTUATOR TEST  )
Front passenger's and right rear doors will not lock or unlock.
  • Poor ground (G501, G502) or an open in the ground wire
  • Blown No. 27 (30 A) fuse in the under-dash fuse/relay box
  • Blown No. 35 (15 A) and/or No. 49 (15 A) fuse in the under-dash fuse/relay box
  • MICU input test (see MICU INPUT TEST  )
  • Door lock actuator test (see DOOR LOCK ACTUATOR TEST  )
Keyless operation does not work (LOCK, UNLOCK, PANIC). Symptom troubleshooting (see KEYLESS OPERATION DOES NOT WORK (LOCK, UNLOCK, PANIC)  )
Doors will not unlock (or lock) with the transmitter, but will unlock (or lock) with the door lock switch and the door key cylinder switch.
Doors automatically relock 30 seconds after being unlocked with the transmitter even though a door has been opened. Symptom troubleshooting (see DOORS AUTOMATICALLY RELOCK 30 SECONDS AFTER BEING UNLOCKED WITH THE TRANSMITTER EVEN THOUGH A DOOR HAS BEEN OPENED  )
Only driver's door will unlock or door locks relock immediately after unlocking with the keyless transmitter. Driver's door lock knob switch test (see DOOR LOCK KNOB SWITCH TEST  )
Keyless operation will work even though the ignition key is in the ignition switch. Ignition key switch test (see IGNITION KEY SWITCH TEST )
The horn does not sound and/or the headlights do not flash when the PANIC button on the transmitter is pressed. Symptom troubleshooting (see THE HORN DOES NOT SOUND AND/OR THE HEADLIGHTS DO NOT FLASH WHEN THE PANIC BUTTON ON THE TRANSMITTER IS PRESSED  )
Security alarm system will not arm. Symptom troubleshooting (see SECURITY ALARM SYSTEM WILL NOT ARM  )
(1) If only one door is not working properly, check that door's lock actuator first, then check the other items listed in this table.