It’s an early version and is expecting to see compressor clutch current. Later models ignore the current and trigger the relay.
It depends if the relay wiring has a load resistance to fool the control circuit.
If your VIN is later then someone swapped the correct panel probably due to LCD issues.
Mine has no relay but later panel. All the info is in that other thread.
JFC102550 covers all models with heated seats as does JFC102540 without heated seats, but that is no longer available. They will run the aircon with or without relay 3. There at one time was a wiring kit to incorporate relay 3 but no longer available and for what it was cost a bloody fortune. But anyone with a bit of nous should be able to look at 1999 and on wiring diagrams and rig relay 3 in. Wire from Hevac to relay 3 pull side and ground. 20 amp feed to relay 3 power side and to compressor, simples.
Simple when you know how!
Hi all
Just a quick message to say thanks to everyone who offered help and assistance with this issue, I now have a working ac system
Next problem .... Cruise control