Caprice Classic Digital Speedometer has GONE DARK!!
Now how fast am I really going?!
(OK so the picture shows it working, because I took the pictures after fixing the problem)
Sometimes it starts working again at random, most of the time its black.
Don't bother taking it to the garage. Don't fear having to completely remove the dash to fix it.
In about an hour (or less) you can fix it yourself, no need for parts, no special GM tools!
You will need:
T15 Torx screwdriver
7mm nut driver
soldering gun (optional)
1.5 elbows in each arm (or just one arm will do)
Step 1: Remove Gauge Bezel
Remove two screws with 7mm nut driver.
Pull bezel to remove (bottom has spring clips)
Step 2: More Screws!
Remove gauge cluster screws (four) using 7mm nut driver.
Step 3: Remove Even More Screws
Now remove the perimeter screws (eight) holding the gauge cluster lens.
(This step eliminates the need to remove the entire lower dash panel)
Then the cluster ring/trim
Then the gauge face trim.
Then the tinted speedometer lens
Then you can remove the cluster itself through the dash opening.
Remove the shifter indicator clip from the steering column collar under the dash.
Once the cluster is out:
Remove the four screws to remove the display.
Be careful it is actually made of GLASS.
Don't make them like that anymore.
Once the display is out, flip it over.
There it is!
The little spring contacts has driven right into the solder contacts on the back of the display circuit board.
This loose connection causes the digital display to be faded or completely blacked out.
The next steps will be what I did to repair them. You could try just cleaning them or slightly sanding them but the material is missing and in my opinion the best way would be to build up the contact points to press down the spring contacts in the cluster base making a better connection.
Adding solder to the contacts of the digital display.
Be careful when using a standard soldering gun. For circuit boards it tends to get hot quickly (as you will see I accidentally overheated one of the contacts and it came right off! - it wasn't used anyway)
Adding solder carefully, contacts are not evenly coated and some built up quite a bit.
A smaller tip or soldering iron would be easier (but not necessary)
Sand the contacts down with nail file.
Lightly sand contaminants off the spring contacts too.
All better! smooth and flat (slightly raised) contacts
Clean everything up with cotton swabs and alcohol.
Then a little petroleum jelly to prevent any future corrosion.
Do a test in the car with the display and cluster to be sure its fixed.
Installation is reverse of removal
digital display 4 screws
cluster trim face
cluster trim ring
clear lens then the eight screws to hold it all together
plus the four screws to hold the cluster in place.
then test it again.
Don't forget the shifter indicator cable.
This is where you need the 1.5 elbow and pillow.
No sense in removing the access panel under the steering column, there's a steel bracket there blocking access.
Use the pillow, place it on the floor at the pedals.
Recline the seat fully.
get in the car upside down and place the clip on the shifter collar
Back together and works great!