I Need Help Dealing withThese Fault Codes Please

[sapote]

Here's what I found: Engine cold and not running: Key Off 12.36v; Key on, position 2, 12.20v; Engine at idle 14.12v - 14.15v.
The battery is 38 months old and the seller has checked and declares it good.
Does any of this info help diagnose the problem?
Thanks!
Steve

Alternator and cables are good, but battery 12.36v is too low. How did you measure the battery voltage? It needs a full charge overnight.

[maupineda]

Thanks for the info. Were you able to repair the problem, or replace the faulty module? Where is the hearing module located, under the seat?
Thanks.

In my case it was fixed with a new battery. My old battery would get too low after a week or so, or 10min of listening to the radio.

[BubbaTree]

I have had seat heating module codes when battery is low. Your battery maybe failing. This is in a Z4M

Thanks for the info. Were you able to repair the problem, or replace the faulty module? Where is the hearing module located, under the seat?
Thanks.

[maupineda]

I have had seat heating module codes when battery is low. Your battery maybe failing. This is in a Z4M

[BubbaTree]

Here's what I found: Engine cold and not running: Key Off 12.36v; Key on, position 2, 12.20v; Engine at idle 14.12v - 14.15v.
The battery is 38 months old and the seller has checked and declares it good.
Does any of this info help diagnose the problem?
Thanks!
Steve

[sapote]

Use voltmeter and measure battery voltage before and during engine idling.

[BubbaTree]

My Foxwell scanner continues showing sever codes from my '03 convertible. I've yet to find accurate info about the cause and the fix for either fault, so, if anyone can/will step up to steer me along, I'll surely appreciate the help.
Here's the latest inventory of concerns:
0F Voltage Supply EWS3 Control Module
5 SZM Undervoltage, Seat Heating
16 IHKA Relay, Auxiliary Heater
50 MRS Power Supply - Battery Supply Cable

One separate question that may or may not be related to any of these faults. The car has developed a recent intermittent failure of either one of my 2 new factory remote keys to unlock the doors or trunk. To the subject matter experts, if that unlock issue isn't related to the other faults, disregard the question. I'll deal with that another time.
Thanks to anyone who can offer up any assistance or directions!
Regards,
Steve