Question about 1997 Pontiac Grand Am
I'm working on my wife's car to get all the issues worked out and make it function normal again. One issue I'm working on now is for as long as she can remember, the shift module for the transmission has not worked. The LED on the left side that illuminates the letters PRND123 works, so I know there's voltage coming in. However, there are multiple LEDs on the right side, one for each drive position, indicating whether you're actually in Park, Reverse, Neutral, Drive, etc., and these lights do not work. None of them work regardless of any position the shifter is in. We can assume voltage is going to the module, I can attest there aren't any driving effects that I could notice, so no issues with the PCM. That probably means that the circuitry on the module board itself, one of the components has failed, most likely one that detects a certain amount of voltage and lights up the correct LED? If anyone has a suggestion on how to troubleshoot that at home, that would be great. I have taken photos of the front and back of the circuit board and created an overlay of the two to aid in tracking down the component circuitry on the board. The last resort is eBay since nalleygmc doesn't stock this part, or the junkyard, but without being able to start up the car, it would be a hit or miss chance one from the junkyard would even work. Thanks! Jeremy
This is a common problem and the issue is with the display of the gear selector, it must be replaced. You will need to remove the cluster form the car and send it into a GM approved repair center for replacement of the display.
Posted on Feb 23, 2012
Testimonial: "This is an appropriate answer for where I posted. I should probably post in the electronics section if I'd like help troubleshooting the board itself. Agreeably, some people will probably just seek an answer such as to simply replace a part. Others, of course, may ask to forego that route, maybe in the case of discontinued parts and such or to not simply (spend money), which is too often the easiest answer. Dennis' answer is very valid and hopefully can help out if others end up on this page. For my particular situation, I'll continue to search for an answer to fix the board on my own, armed with electronics know-how and a multi-meter and hopefully a circuit layout to help aide in knowing how this thing is supposed to work and replace the malfunctioning component, which is all a GM repair center would do, the only difference is they have access to the service information for this part! Thanks again :)"
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Posted on Jan 02, 2017
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