I have a '88 Suburban . Intermittent wiper settings don't work, and wipers will not shut off or park properly unless I play around with the switch control and use the "mist" setting on the control lever. Here's what I've done... First changed the multifuntion turn signal lever. this fixed the cruise control, as there was a broken wire in the old assembly...but wipers still work the same. Next, I replaced the wiper pulse relay module located behind the dash panel on the bottom of the steering column. I though for sure that would do it....but wipers still work the same. they work fine on continuous high and low speeds and control the washer pump fine...but will still not work on intermittent settings, or shut off or park properly. The motor seems fine, but I am told the park switch assembly on the motor may be bad. Is it possible to change this without changing out the whole motor? I know GM uses the negative ground through the switches, and takes the 12V+ direct to the wiper motor, making it a pain to troubleshoot. Any troubleshooting suggestions or parts advice would be surely appreciated !
Bill