balbs

First try to clear the codes. Disconnect the battery and clean the battery cables and battery posts. Reconnect the battery. Make sure it's nice and tight. See if the error comes back. I would start with this cheaper method.

Ricardof

Thanks balbs, just awaiting my cable to arrive and software. I already know that this is the code it shows, since it was provided by previous owner. I´ll buy some dielectric grease and put it on all main cable connections from the battery.

Thank you.

teerak2uk

Any update on working solutions for this problem guys

many thanks

bobhleihel

i have this problem in my car E60 525 2004 i changed the SGM/Sim module and when i want to coded on to the car i cant always wrong chassis number someone telling me that i want to get it only for the US only and the European models its not working on the car any help???

Dan Carthew

Afternoon all, glad to see I'm not the only one having this problem. Here's what I've got and what I've done so far.
My car was showing the "drivers active headrest reserve voltage" fault, originally I thought it was the passenger seat mat so I fitted an emulator/dummy load and this made no difference. I took it to a chap last night which used INPA to turn off the headrest, we reset the fault but it came back immediately. I think my next plan is to check all the battery terminals, then maybe look at the wire that often needs replacing don't know the name (goes to battery live) apparently cutting the cable and fitting a 2ohm resistor is the way to go. If it does end up being the module, where is it located?

seanjordan20

How old is your battery and if it's not that old was it programmed when installed

jtbgonesailing

+1 on the battery and coding... Also take a look at this BMW Technical Information Service document. May have to dig a little, but it should point you in the direction for a repair procedure.

https://www.newtis.info/tisv2/a/en/

Dan Carthew

Battery was in the car when I got it so no idea really, I could try coding it I guess, do ya think that would help?

Dan Carthew

That's proper handy, thanks mate.

seanjordan20

My point in asking is if the battery is on its way out then you would get codes like the one you're having. Find out how old the battery is or what's left in the tank. Could be as simple as replacing a bad battery as coding it instead of changing things it not.