99 OBS Tahoe-W/S Wipers - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Ironhorse** · 10-09-2018, 01:52 PM

Wife and I have a '99 Tahoe that has been, over all, a pretty good vehicle. Couple things have needed attention thru the years, new cat's, fuel injectors (spider), been converted back to green anti-freeze, and did new intake gasket at same time. 205,000 on the clock, 5.7, 4wd.

Recently with all the rains we have had the wind shield wipers have been acting really strange. Some times will make one pass, some times make two, some times stop in middle of the wind shield. Turn switch on and off at least couple times to get windows clear of the rain. Some times works fine no problem. Been getting worse, Googled "Tahoe erratic wipers" and found several references to "wiper control pulse module". Thinking this can't be good I watched several U-tube videos on how to change it. Went to local parts house and got a HELP brand control module, about $25 and change.

Went home, opened the hood on the Tahoe and within 15 minutes had the wipers working again as they should !! Luckily we have a '99, newer than that and it seemed a bit more involved. Was really amazed it was that easy. Three screws, pull the cover, pull the wire harness cluster and remove the pulse module board. Insert new board, replace harness, replace cover and functional test. Wow, what an easy fix that was. Before I started looking into this I was really thinking this is gonna' be 'spensive, thinking it's inside the column, take it to a shop and bend over, LOL.

It amazes me that GM engineers allowed this to be such an easy task. Right there on the front fire wall. I've dealt with engineers before (Boeing Aircraft Co.) and it always seemed that engineers like to take a seemingly simple mechanical task and improve it to be a 6-8 hour operation. Just wanted to share, hopefully may help someone with similar problem.

Sorry for such a long post on a trivial (now) problem but just still amazing that with all the relays, sensors, electronics and such on newer vehicles I had the problem fixed within 15 minutes.

**cst204x4** · 10-14-2018, 10:48 PM

Yea I remember doing this to my 98 suburban easy fix. Sold that one 3 yrs ago with 250,000 on it was still running great!

10-09-2018, 01:52 PM	#1
Ironhorse Senior Member Join Date: Jul 2001 Location: Wellington, Ks Posts: 10,294	99 OBS Tahoe-W/S Wipers Wife and I have a '99 Tahoe that has been, over all, a pretty good vehicle. Couple things have needed attention thru the years, new cat's, fuel injectors (spider), been converted back to green anti-freeze, and did new intake gasket at same time. 205,000 on the clock, 5.7, 4wd. Recently with all the rains we have had the wind shield wipers have been acting really strange. Some times will make one pass, some times make two, some times stop in middle of the wind shield. Turn switch on and off at least couple times to get windows clear of the rain. Some times works fine no problem. Been getting worse, Googled "Tahoe erratic wipers" and found several references to "wiper control pulse module". Thinking this can't be good I watched several U-tube videos on how to change it. Went to local parts house and got a HELP brand control module, about $25 and change. Went home, opened the hood on the Tahoe and within 15 minutes had the wipers working again as they should !! Luckily we have a '99, newer than that and it seemed a bit more involved. Was really amazed it was that easy. Three screws, pull the cover, pull the wire harness cluster and remove the pulse module board. Insert new board, replace harness, replace cover and functional test. Wow, what an easy fix that was. Before I started looking into this I was really thinking this is gonna' be 'spensive, thinking it's inside the column, take it to a shop and bend over, LOL. It amazes me that GM engineers allowed this to be such an easy task. Right there on the front fire wall. I've dealt with engineers before (Boeing Aircraft Co.) and it always seemed that engineers like to take a seemingly simple mechanical task and improve it to be a 6-8 hour operation. Just wanted to share, hopefully may help someone with similar problem. Sorry for such a long post on a trivial (now) problem but just still amazing that with all the relays, sensors, electronics and such on newer vehicles I had the problem fixed within 15 minutes. __________________ 1971 Chevy 1/2T 4x4 LWB 350 V-8 Was sm465-now 350TH/np205 Tilt, Tach, Towhooks Original Truck AM/FM Wellington, Ks

10-14-2018, 10:48 PM	#2
cst204x4 Senior Member Join Date: Jan 2012 Location: corunna michigan Posts: 2,006	Re: 99 OBS Tahoe-W/S Wipers Yea I remember doing this to my 98 suburban easy fix. Sold that one 3 yrs ago with 250,000 on it was still running great! __________________ 1970 CST 4x4 collecting nos parts for this project 1972 cutlass owned since 1984 1972 cutlass conv 1970 Cutlass conv 1981 chevy shortbox 1986 grand national 2004 2500HD Crew Cab 66,000 miles

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