Hi guys!

My new battery drained twice last week.

Charged the battery and measured drawing current at park position. Yesss! 210 miliamps

Removed HFM and dropped to almost zero.

So, what I did:
Removed the white cable pin from the connector (constant 12V) and soldered a a wire from purple pin's connector to white pin.
The purple cable is only energized when the ignition is ON and HFM is fed only while engine is running.

Tested whole day and no issues so far. The only disadvantage is your should hang up your call while engine is running.
On a proper working system, HFM is still active during your call even engine is turned off. I believe this is the root cause of the failure. After 10 years, some relays keeps stuck and since the HFM is energized, draws current at pakring position.

With this solution, you can keep your HFM installed without any scary battery drain issue.

If I'm the first guy finding this solution and you need more detail, please LMK and I may add some detailed pics of steps.

Bye,
Türk

 

I might try this.

 

God job !

 

i unhooked mine this week. dont really use it and was worried the situation may happen again.

 

Great work, I’m saving this in case my new (old!) RL starts eating batteries.

 

good info. Can you post the detailed pics because after i disconnected it im getting the stuck HFL screen on the audio. What relay powers this function and can i pull it to cut it off? 🤔