Hi, recently my Acura MDX 2012 started making issues with the key fob not unlocking / locking.
At first it only didn't work sometimes so I thought it's a battery issue with the fob, but now it stopped working completely on BOTH my keys (one of which is 6 months old), so it's not the fob.
Where do I check next
A couple things you can try.
Press the transmitter lock or unlock button at least 10 times to reset the transmitter.
If that doesn't work:
Doors Will Not Unlock (or Lock) With the Transmitter, But Will Unlock (or Lock) With the Door Switch
Keyless/Power Door Locks/Security System Symptom Troubleshooting - Doors will not unlock (or lock) with the transmitter, but will unlock (or lock) with the door switch
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
NOTE: Before troubleshooting, check for B-CAN DTCs and troubleshoot the indicated DTC(s) first.
1. Turn the ignition switch to LOCK (0).
2. Remove the ignition key from the ignition switch.
3. Close and lock the doors.
4. Try to lock/unlock the doors with the keyless transmitter.
Do the door lock actuators work normally?
YES -
Intermittent failure, the system is OK at this time. Check for loose or poor connections.
NO -
Go to step 5.
5. Open the driver's door.
Does the key-in reminder chime sound?
YES -
Faulty ignition key switch, or short to ground on the wire related to the ignition switch. Repair the wire as needed.
NO -
Go to step 6.
6. Do the transmitter test Keyless Entry Transmitter Test/Replacement.
Is the transmitter OK?
YES -
Substitute a known-good MICU and, recheck. If there is still a problem, substitute a known-good immobilizer-keyless control unit, and recheck. If the problem goes away, replace the original immobilizer-keyless control unit Service and Repair.
NO -
Replace the transmitter.
maybe both batteries are dead
Batteries are working and it gives out a signal, tested.
Where should I start to look?
how do you know it gives out a signal
I just tested it through a flipper zero, it does give out a signal.
maybe it lost its pairing with the vehicle
Both keys at once?
What things should I check, I'm a bit lost on this?
well if the module in the car was reset or lost power?
Try re-pairing them.
I don't recall anything being reset and can't think why it would lose power.
But anyway, any idea where to look for this?