2002 Prius dash hvac controls not working.

Not sure if this is the right place to post this, I just bought a 2002 & it has no heat or ac, the controls in the center display do nothing, they don’t light up & don’t turn anything on. All other controls aside from the hvac work. I pulled the console out & checked connections all were good. I checked fuses & resistance on associated relays & those tested good, I went to the junk yard & pulled the console out of another 02 Prius thinking maybe it was the circuit board which it still could be, maybe both were bad but the donor console is the same story. Any ideas on what the problem could be? I’ve searched for others with the same issue & can’t find anything. Thank you

 

The check engine just came on today I can’t find my scanner so I’m going to take it to have the codes pulled tomorrow. It runs & drives just no hvac controls & on start up it makes this loud grumbling sound not from the engine but from the right side under the car for about 5 minutes until the electric motor kicks on & sometimes when driving at low speed when the gas engine kicks on. I cleaned out the throttle body, there was some oil in it & I changed the spark plugs, no change. I believe I found the hvac control issue as I tested continuity through the main heater relay & there was no continuity through the coil so I ordered a new relay.

That was not easy lol

 

I only tried swapping the one board I’m going to have to go through this some more. I got the codes and they were only for the cat & misfire on cylinders 1,2,4 which was due to a ripped up intake hose which I replaced & those codes are gone, there’s nothing pertaining to the hvac system. I also got the new heater relay in & confired it’s good & still nothing pertaining to the hvac system functions. I’m looking through the testing & wiring diagram on prodemand as I write this. Thank you for the diagrams

 

These are the boards, they actually both came in the unit I pulled from a 2001, there does appear to be any damage. I assume it would be a problem in the bottom board though as that’s where the ribbon from the controls connects

 

ya they don’t blink, they don’t do anything. I tested for power at the relay, nothing, at the linear controller (resistor), nothing. From the wiring diagram it looks like the signal goes from the ignition to the body control ecu then to the heater relay & on to the rest so I’m thinking it’s an issue in the body control ecu which of course is behind the dash on the drivers side so I’m going to pull that apart this week

 

Although I could be wrong about the routing because this diagram is a little confusing

 

I got the diagram from prodemand, it’s not very good. I’ll get out & test everything again in the morning & post the results on here. The issue is that there is zero response from the ac amplifier, the dials light up if the lights are on but no lights or response from the hvac buttons or dials, everything else on the center bezel works but the hvac functions & that’s on the original & donor panels so the issue has to be somewhere in the wiring going into that connector at some point

 

The outside temperature doesn’t have any reading either, I don’t know if that has anything to do with the problem but it’s the only other thing in the center console not function

 

Yes I’m open to the possibility that two ac amplifiers from two 20 year old vehicles are both trashed lol The only testing procedure it gives me for the amplifier is to test the ac magnetic clutch relay & wiring to it so I’ll do that in the morning & cross my fingers that relay is bad though I highly doubt it as I’ve already tested all the relays if not at least it may confirm the amplifiers are toast & I won’t drive myself crazy anymore

 

I get 11.47v at the ig terminal and 12v at +B

 

Ya that’s my thought as well, I guess I’ll have to get a 3rd one lol