Pretty when they work, electronic...
Pretty when they work, electronic Corvette instrument clusters are a pain when they don't.
The factory has no responsibility to keep parts in stock for your 10-year or older Corvette.
Fact: Early C4 ('84-'88 models) Corvette instrument panels are hard to repair, if they can even be repaired.
Fact: Advanced Electronics Remanufacturing (AER) is the holy grail of instrument-panel-repair artisans and, best of all, GM likes these guys.
The Corvette instrument panel is a thing of beauty. The first of the electronic instrumental panels, the colorful '84-'88, was replaced by the more conventional analog "needle" gauge and center display package in '89, then with the truly inspired C5 system for the new '97s. Regardless, all of the instrument panels have their "personality problems" that serve to irritate their drivers. After all, what part of your car do you see most when driving? It makes sense that it couldn't be perfect.
The most common dashboard...
The most common dashboard disaster, the first-generation C4 ('84-'88) instrument panels are commonly dark or don't work at all.
The standard LCD Corvette instrument panel is a nightmare for many owners. Dark or non-operative, the instrument panel that was so pretty when new is often a major problem. For those not suffering with totally dark instrument panels, there are often intermittent lighting failures such as the dash winking out to blackness on railroad crossings. But, contrary to rumor (and we've heard plenty), there is a fix.
Carefully remove the instrument panel by removing the surrounding panels. There are four screws holding it in place to the dashboard framework as well as a large plug system on the right side of the unit. Unplug the unit, then remove the screws and carefully lift the instrument panel out of the dashboard. Remove the screws carefully. The color display panel, which is made of glass, is one of the most breakable parts of the dashboard. For those versed in the careful art of television repair, tapping or banging on the glass will not fix your problem. For those more aggressive in this kind of repair technique, the glass panels sell for about $150 each, so be ready for a heavier bill if you can't wait to send the unit to the folks at AER. Estimated cost for most repairs is under $500.
The plug system of an early...
The plug system of an early C4 dashboard. Unhook this wire connector carefully.
These instrument panels are far more reliable than the earlier units and significantly less complex internally. For the most part, the biggest problem with these clusters is missing segments (light squares) within the center electronic display. The most common display problem is not an error of the instrument panel, but rather customer viewing error. Basically, the analog (needle) gauges are not set up on a linear fashion. In other words, the halfway point for the needle is not the halfway point for the reading (numbers). Case in point: The temperature gauge may have a top reading of 260 degrees F, but the halfway point is not 130 degrees. Likewise, the temp gauge may move all the way up to the three-quarter mark before the electric cooling fans kick in and drop the needle back to the halfway point. This misread is a common misperception with these clusters and a common reason they are sent in and sent back with no repair completed.
These instrument panels also unbolt in a similar fashion to the first-era units; however, the wiring loom attachment is in the back of the instrument panel. Be careful with all connectors-don't ever pry at the panel to remove one, as it will surely break and cause further repairs.