ChummaLee

I have a 2009 Acura MDX with Tech and Entertainment Package whose battery died twice in a week and after the second jump, I without thinking changed the battery. The new battery again died and that led me to ponder and research on the internet. Only to find out that the otherwise reliable MDX has an issue with this.

After watching videos and reading up, I was able to isolate the problem in the Door Locks, Interior Light and Radio circuit. When I was on DC 10 setting on the multimeter, it showed a reading of 3.24. I have pulled the 40 Ohm fuse out and these things don't work but my SUV can start now without being dead every other day.

What should I be doing to isolate and rectify the problem?

Skirmich

There are 2 known parasitic issues with these years.

1.- HFL Module
2.- A/C Compressor Relay

I think your HFL Module is going bad.

ChummaLee

Yes. It was the HFL module indeed!!

All good now. The drain in 25 mA now. Well within acceptable levels.

Skirmich

I didnt have issues with mine but since I never use my phone on the go I decided to unplug it anyway.. Better safe than sorry, Specially after buying a brand new Optima Battery. If you want to regain Bluetooth you can buy a redesigned version but is a little steep over 250 bucks for the new unit.

Carpayment4life

Thanks ...maLee, for the .25vdc value.
I checked mine (last Fall) and got the same .254vdc, but never knew if it was normal.

technocrat

Whats the difference in redesigned version? Just the Drain fix or some additional features too?

Skirmich

AFAIK is just to fix the drain issues.