I Need Help Dealing withThese Fault Codes Please

[sapote]

Thanks for the help! Do you think a bad battery is the cause of some or all of those fault codes I posted in the beginning? I'm getting a new battery tomorrow and will clear those fault codes and see if they return. I'll post the results either way.
Thanks, again!
Steve

Hopefully but I don't know. You must get a new batt anyway.

[TexaZ3]

I would also check voltage regulator.

[sapote]

Batt was 14v with engine idling so regulator is good.

[BubbaTree]

Got the new battery installed. The voltage is 12.67 before engine start up, and 14.2 at idle. Looks like the alternator and voltage regulator are both in good shape. Cleared the fault codes, and checked again. The only one remaining is 16 IHKA Relay, Auxiliary heater. I can't find any useful information about that one, what it is and/or how to fix it. If anyone can help with this one, I'll really appreciate it.
Thanks,
Steve

[sapote]

Got the new battery installed. The voltage is 12.67 before engine start up, and 14.2 at idle. Looks like the alternator and voltage regulator are both in good shape. Cleared the fault codes, and checked again. The only one remaining is 16 IHKA Relay, Auxiliary heater. I can't find any useful information about that one, what it is and/or how to fix it. If anyone can help with this one, I'll really appreciate it.
Thanks,
Steve

Time to look at the TIS wiring diagram for the climate control panel.

[sapote]

do you have any issues with the blower or the rear window defogger? These are the only 2 relays I know.

[BubbaTree]

do you have any issues with the blower or the rear window defogger? These are the only 2 relays I know.

No issues with the blower, and the rear defogger seems to be working correctly. The weather here won't fully cover the rear window, but the defogger seems to be working well.FWIW, I replaced both of the relays located inside the rear passenger trim panel. If there are any other relays that may be suspects, I can't find where they are located. So far, the new battery seems to have stopped that remote key unlock problem. Aside from the IHKA fault code showing up on the scanner, I don't actually experience any driving or operational issues. Maybe it's time to punt and move along!
Thanks to all for the help. I'll post any useful information I may find.
Merry Christmas!
Steve