Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSACURA2012TL BASEREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTANTI-THEFT SYSTEMSKEYLESS/POWER DOOR LOCKS/SECURITY SYSTEMSYMPTOM TROUBLESHOOTING INDEX

2012 Acura TL Base

Symptom Troubleshooting Index

2012 Acura TL BaseSECTION Symptom Troubleshooting Index

Check for B-CAN DTCs. If any B-CAN DTCs are indicated, troubleshoot and resolve them first.
If the door lock system and the keyless operation do not work, troubleshoot the door locks first.

NOTE: The system does not function when the ignition switch is ON (II), or the vehicle ignition is in the ON mode.

Symptom	Check Items	Also check for
All the doors will not lock or unlock with driver's door key cylinder or door lock switch or keyless transmitter	Poor ground (G203, G401, G402, G405, G601, G651) Driver's door key cylinder switch test (see DOOR KEY CYLINDER SWITCH TEST ) 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) Door lock actuator test (see DOOR LOCK ACTUATOR TEST ) Driver's MICU input test (see CONTROL UNIT INPUT TEST ) Passenger's MICU input test (see CONTROL UNIT INPUT TEST ) Check the UART line An open in the wire A short to ground wire A short to power wire
Driver's and left rear doors will not lock or unlock with driver's door key cylinder or door lock switch or keyless transmitter	Poor ground (G401, G402, G601) Blown No. 24 (20 A) fuse in the driver's under-dash fuse/relay box Blown No. 25 (15 A) fuse in the driver's under-dash fuse/relay box Driver's MICU input test (see CONTROL UNIT INPUT TEST ) Door multiplex control unit input test (see CONTROL UNIT INPUT TEST )
Front passenger's and right rear doors will not lock or unlock with driver's door key cylinder or door lock switch or keyless transmitter	Poor ground (G203, G401, G405, G651) Blown No. 1-2 (AS F/B STD) (40 A) fuse in the under-hood fuse/relay box Blown No. 10 (10 A) fuse in the passenger's under-dash fuse/relay box Blown No. 13 (20 A) fuse in the passenger's under-dash fuse/relay box Passenger's MICU input test (see CONTROL UNIT INPUT TEST ) Door multiplex control unit input test (see CONTROL UNIT INPUT TEST )
Keyless operation does not work (LOCK, UNLOCK, PANIC)	Symptom troubleshooting (see KEYLESS OPERATION DOES NOT WORK (LOCK, UNLOCK, PANIC) )	Customized settings in the multi-information display (MID), see Owner's manual for details
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	Symptom troubleshooting (see 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 ) Door lock switch test (check the door switch ON/OFF information with the HDS)
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 ) Door switch test (check the door switch ON/OFF information with the HDS)
Only driver's door will unlock or door locks relock immediately after unlocking with the remote	Driver's door lock knob switch test (see DOOR LOCK KNOB SWITCH TEST )
Trunk lid release actuator will not work when the trunk lid outer handle switch is pressed	Lock knob switch is faulty Open lock knob switch unlock input wire Door lock actuator is faulty
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 )	Customized settings in the multi-information display (MID), see Owner's manual for details
Keyless operation will work even though the ignition key is in the ignition switch	Ignition key switch test (see IGNITION KEY SWITCH TEST )
Security alarm system will not arm	Symptom troubleshooting (see SECURITY ALARM SYSTEM WILL NOT ARM )

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.