AC button led don't light up when I press ac button.How to fix it?I must replace whole unit?
It's small white led bud don't know what type of led is that.

03 lancer es

 

Have you checked the A/C fuse in the engine compartment fuse block ? Is the A/C working and just the LED not ? Need more info.

 

just led , ac is working
I already take apart control unit and it's small white led

 

It's most likely then a bad connection or switch contact to the LED. I work in repairing electronics. The A/C LED in my spyder is a tricolor although they don't use the red mode. Yellow is A/C off .. Green is A/C on. I'm not up on what LED type is used in your model. LED's almost never burn out although it is a remote possibility.

I'd recommend not fixing it if it is just a cosmetic issue unless it bugs you so much and you have the cash to spare. Perhaps you could find a used assembly also. I've seen this link posted for searching junkyards by the moderators:

www.car-parts.com

Have a great holiday weekend.

BD