AC Throwing 8 Codes (1 Viewer)

[raymond747]

Hey all,

I just bought a 2002 LX470 with 200,000 miles. Slowly starting to see all the little things wrong with it, but determined to fix as many as I can.

I am diagnosing the AC and its throwing trouble codes: 12, 17, 19, 21, 23, 26, 37, 47. Found some of the trouble codes on another post but some are missing.

I see compressor was changed at 140,000 miles (see attachment).

I’m relatively new to the 100 series community, so please be forgiving on my post. I did some research and am planning on replacing the outdoor ambient temperature sensor since the outside temperature reading is empty. Just says ”outside “.

I saw perhaps the fuse box in the driver’s footwell might be the cause.

Any help or places to start would be appreciated. I haven’t purchased techstream yet, do you think it’d be worth it?

Thank you for your time

 

[raymond747]

Update: added freon and code 23 went away. Compressor now engages and cold air successfully comes out. Solar sensor doesn't work even if tested outside and/or with light shining directly on it.

 

[raymond747]

Update: I disconnected the battery for 10 minutes and reconnected. Now down to 2 codes! 12 and 21. I'll replace the ambient temp sensor. I was flashing a light directly on the solar sensor but I'll try to redo the test outside and see if code 21 goes away

 

[Escape Artist]

What did ya find out about the solar sensor code 21? What does the solar sensor do exactly? Compensate for direct sunlight coming into the cabin?

 

[raymond747]

What did ya find out about the solar sensor code 21? What does the solar sensor do exactly? Compensate for direct sunlight coming into the cabin?

HVAC problems. 8 codes. HELP

I bought my LC knowing the AC was not working. I made a silly assumption that there was most likely a leak in the system or a more basic failed part that would be easy to diagnose. Once I dug into it I found I have 8 separate hvac related codes. They all make reference to the ac amp so I...

forum.ih8mud.com

It’s an input to the A/C. Can’t say for sure how it plays a role in temperature management

 

[Escape Artist]

For that solar sensor code 21 ... I discovered that it helps to remove the sun visor from the dash and windshield before running the diagnostics ... duh. Welp, so there's that. No more code.