I Need Help Dealing withThese Fault Codes Please

[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

[sapote]

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

[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.

[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]

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

[TexaZ3]

I would also check voltage regulator.

[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.

[BubbaTree]

12.5v says it's a bad battery.

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

[sapote]

Looks like the battery is the problem. It's dropped from 12.8v to 12.5v in 2 hours sitting on the bench. I'll replace it today and report any similar problems if any should occur. Thanks for the help, and now to see it those pesky fault codes return.
Thanks, again!
Steve

12.5v says it's a bad battery.

[BubbaTree]

I don't have access to that kind of equipment, but I used my Schumacher charger set to 2Amp overnight. Today, my multimeter shows 12.8v on the bench. After 1 hour, the voltage reads 12.75v, which seems like a significant drop over 1 hour time.

Looks like the battery is the problem. It's dropped from 12.8v to 12.5v in 2 hours sitting on the bench. I'll replace it today and report any similar problems if any should occur. Thanks for the help, and now to see it those pesky fault codes return.
Thanks, again!
Steve

[Zack]

I don't have access to that kind of equipment, but I used my Schumacher charger set to 2Amp overnight. Today, my multimeter shows 12.8v on the bench. After 1 hour, the voltage reads 12.75v, which seems like a significant drop over 1 hour time.

No that's not a problem at all, you're talking .05v drop is the surface charge dissipating

[BubbaTree]

If using power supply, charge it at constant 6A overnight, then charge it at constant 13.5v for 4 hours. At this point if charging current is more than 0.2A then battery is bad.

Normal battery always has 12.6v minimum after parked overnight.

I don't have access to that kind of equipment, but I used my Schumacher charger set to 2Amp overnight. Today, my multimeter shows 12.8v on the bench. After 1 hour, the voltage reads 12.75v, which seems like a significant drop over 1 hour time.

[sapote]

If using power supply, charge it at constant 6A overnight, then charge it at constant 13.5v for 4 hours. At this point if charging current is more than 0.2A then battery is bad.

Normal battery always has 12.6v minimum after parked overnight.

[Zack]

Charge the battery on the bench or in the car with cables connected? What voltage level am I looking for?
Thanks!

A fully charged battery is around 12.6v IIRC 12.2-12.3 is something like 25% charged. Charging on a bench or in the car will yield the same effect.

[BubbaTree]

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.

Charge the battery on the bench or in the car with cables connected? What voltage level am I looking for?
Thanks!