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Old 01-23-2011   #1
1987 GTA
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digital speedometer

I just bought an 87 gta and the speedo does not register the speed, digital speedometer. i took dash apart and dont see any problems with the unit. any ideas? thanks
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Old 01-24-2011   #2
merc3065
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Re: digital speedometer

Does it show 0 on the display or nothing?
What about during startup? Does it go 188 then go to 0?

If it's registering 0 and when you are moving still 0 its the VSS. Check the VSS module first, then check the VSS wiring down to the transmission. VSS is the yellow module located on the ECM under the pass side dash.

If it's not registering anything just blank display, replace the control board, LCD or whole dash.
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Old 01-24-2011   #3
1987 GTA
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Re: digital speedometer

Thanks for the reply, i took the yellow module out and dont see any problems with it, the board looks fine. it says 0 at start and 0 while driving. the lcd is getting power cause the blinker signals come up.
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Old 01-24-2011   #4
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Re: digital speedometer

The VSS circuitry is toast (probably one of the diodes or somethin popped) see if you can get a working one to test, but I had the exact same problem.

btw, the LCD and the blinkers are on 2 seperate circuits on the back of the dash.
The LCDs are all connected to boards. The indicator lights and almost all of the back lights are twist fit against that flexible plastic circuit board stuff.
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Old 01-24-2011   #5
1987 GTA
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Re: digital speedometer

thank you very much for the info, appreciate it. just starting on my venture with the gta.
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Old 01-24-2011   #6
1987 GTA
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Re: digital speedometer

these things are not easy to find huh?
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