I have a 1999 Elantra and the int. wiper control and park does not work. The slow and fast speeds work fine. I have checked fuses and motor works fine (connected up spare working motor, and verified it worked, only on slow and fast wiper speeds as well).

According to the schematics the ETACM is responsible for the int wiper, timing control, and auto parking. I need to first get to the module (in back of ashtray/radio), check the power to it, and and the ground, and possibly replace it.

My question is which electronic box is it behind the radio, upper one or lower one? Each one has a multi wire terminal connected to it. Both boxes have a sticker label HMC One is stamped "AT" (w/18 wire connector) the other has a 20 wire connector. How much should I expect to pay for a new one? Any other concerns I should be aware of?

Thank you, Todd

You mentioned wipers...I had similar problems(stuck relay-couldn't stop wipers-running on 1st speed all the time...aaargh!!! ). Try the one from which u hear the clicking of relay when using wipers. My car has this so it wasn't hard for me to find the problem. I've disassembled the box and removed relay's plastic harness, and carefully cleaned it's contacts.

Very annoying if wipers don't work...


hope this is helpful

I replaced the ETACM which the relay was soldered to. This fixed the problem. After opening up the box it looks like a cold solder joint was the possible cause.

Thanks for you reply.