I have a 1999 Elantra and the int. wiper control and park position 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 module is it behind the radio, upper one or lower one? Each one has a multi wire terminal block 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. Any other concerns I should be aware of?

Thank you, Todd

The problem was the ETACM. This was replaced and now the intermittent wiper control and park position work.