Tommy TLX A-SPEC, AWD

I've watched every YouTube troubleshooting tutorial available and have replaced the key FOB batteries, Hood Lock Latch Actuator Assembly (OEM 74120-TZ3-A12) and the Sub Relay Keyless Entry Control Module (OEM 38330-TZ3-A010-M1). No issues for 4 days and then at 2am this morning the visual/audible alarm activated. I shut the alarm off with the remote. 30 minutes later another alarm so I disconnected the battery and went to bed. In total, this is the 3rd time I've had this problem in the last two weeks. Any help would be greatly appreciated. Thank you!

thoiboi

check all your door sensors/trunk sensors next

Tommy TLX A-SPEC, AWD

I thought about the door and trunk sensors, but I don't have a door open indication. Maybe it doesn't matter. I now the Hood Lock Latch Actuator Assembly is usually the problem when it's a sensor issue. Thank you for your input.

619rcr

Weird stuff with these cars seem to be most often attributed to the 12v battery. How old is your's and is it a lead acid or AGM?

Tommy TLX A-SPEC, AWD

It's the original battery. Not sure on the type. Maybe I should have it checked. Thanks.

Tommy TLX A-SPEC, AWD

My AGM battery tested fine. Still looking for more ideas.

Charlieu

I find that I get about 3 years out of a battery before things start going weird. Battery tests show good, but battery replacement fixes the weirdness. These cars eat batteries more than any other vehicle that I've owned.

Tommy TLX A-SPEC, AWD

The battery is 5 years old. Maybe I should change it, cheaper than replacing a Control Unit.

619rcr

Just to clarify, this is a factory alarm not aftermarket?
2am seems suspicious to me. Is is possible someone is actually trying to tamper with the car? Can you park it in a garage?

Tommy TLX A-SPEC, AWD

Yes, factory alarm. No modifications other than red-coated calipers. Car is parked in a non-accessible garage. It has happened during the daytime. I don't drive the car often (maybe once a week). You may be correct about the battery. I'm watching to correlate if the alarming is more frequent following periods of not being driven and the battery not being recharged. Drove it yesterday and no alarms so far.

Tommy TLX A-SPEC, AWD

Replaced the AGM battery and still alarming occasionally. What next?

Charlieu

When you are at home, put your key fobs in a metal box. If the alarm still goes off, at least it will tell you the key fobs aren't the culprit. Anything beyond that, you may have a faulty computer module or a wiring problem. Both of those are above my paygrade to troubleshoot.