Speedo inop

Tiny
JOSEPH MOORE
  • MEMBER
  • 1990 GMC SONOMA
  • 4.3L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 101,499 MILES
I had to put analog cluster in until I find someone to fix digital for decent price and speedo on analog does not work, but cruise works. I can't seem to fond schematic for that circuit, I hooked speedo input wire from digital harness to pin 14 but still no response.I am a retired master Nissan technician and usually pretty fair at electrical but without diagram and not much gm experience Im kindof at dead end.
Tuesday, October 26th, 2021 AT 4:13 PM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Couple questions. Does the odometer work? If so, then we need to know what vehicle this analog cluster came out of.

The speedometer and odometer are run off the same input circuit. So, if one is working and the other is not then the cluster is the issue.

https://www.2carpros.com/articles/how-to-check-wiring

I am attaching the info from the manual on this operation and the wiring diagram from the DRAC to the cluster.

Take a look at this info and let us know what you find with the testing below.

Thanks
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Thursday, October 28th, 2021 AT 4:09 PM

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