90 silverado speed signal

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=141608
Printed Date: May 03, 2024 at 10:47 PM

Topic: 90 silverado speed signal

Posted By: 70sguy
Subject: 90 silverado speed signal
Date Posted: August 13, 2016 at 12:17 PM

I am wondering If anyone knows the location and color for the vehicle speed sensor on a 90 silverado. Also if you know where the reverse signal wire color and location. I have searched all over the net and I find nothing. If the only place to tie in is at the speed sensor itself, then which wire is it?

Thanks

Replies:

Posted By: lurch228
Date Posted: August 13, 2016 at 8:50 PM

Here is the 91 Suburban Diagram. C11 of the DRAC will go to the A10 terminal on the 24 pin connector of the ECM (curcuit #437, wire color-brown)
posted_image

Posted By: 70sguy
Date Posted: August 14, 2016 at 1:24 AM

That will help with the reverse wire, but the 1990 didn't have the DRAC. I wonder if I can tie in right at the VSS. It has 2 wires and is located at the tail housing of the transmission. I just don't know which wire to tie into. I am guessing one of the wires is ground and the other is signal? I guess maybe if I check each one for continuity to the frame to determine which is ground? Can anyone confirm this?

Posted By: lurch228
Date Posted: August 14, 2016 at 2:11 PM

If no DRAC and two wire then one is ground and the other is AC singnal. Some 90's had a DRAC some didn't. Should be able to get it at PCM also.

Posted By: lurch228
Date Posted: August 14, 2016 at 2:23 PM

Some good info here at this link.
https://ck5.com/forums/threads/end-all-post-for-drac-vss-yeah-right.124012/

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