Question about Pontiac Bonneville
Instrument cluster reading wrong
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Posted on Jan 02, 2017
SOURCE: 1991 Volvo 740GL Speedometer
I remove two panel underneath the steering column. The first panel is removed using a 10 mm socket. The second panel is removed using a torx socket (can't remember the size). Removing these two panels gives you room to get to the clip on speedomter. Looking at the speedometer, you should see two rectangular holes on each side of the speedometer cover. I use a awl to push in the clip (you could use a screwdriver). Looking underneath the dash, you should be able to see the clip you are pushing on with the awl. I take my 2nd awl and put it behind the clip. I get the left side to release. One the speedometer cover releases, you can see the speedometer. You will see the 4 torx screws (t20) and two smaller clips holding the speedometer. All that is left is the wiring. (I take a sharpie pen and mark one of my wire locations on the speedometer. I am not sure what it does. It is a single wire.)
Posted on Aug 20, 2008
how is your shifting, usually a bad speed sensor will set a check engine light and may cause shift errors, this trans has a internal and external speed sensor, the pcm uses the external for shift and for cruise and for also cruise control. A quick no scanner way to tell is if your cruise is working, if it is then your most likey looking at a bad cluster, take it from me i'm a master gm tech. if i don't have a scanner to do a guage sweep it's like having a broken arm while fixing these. but this should help you out.
Posted on Jan 06, 2009
have you got a dimmer switch on your model to dim the dash lights. if you have it may be faulty. link the cables together if the lights work the switch is faulty. if you have not got a dimmer switch
your printed circuit on the back of the dash may be faulty or the plug in the back of the dash is not pushed all the way in. hope this helps
Posted on Apr 16, 2009
It may not be a bulb, as the instrument cluster usually has a number of bulbs and they probably didn't all blow at once. Pulling instrument clusters can be touchy and may not be for the average "shadetree mechanic" however, typically there are a few screws above the cluster going into the dash pad and a few hidden behind the trim panels below the cluster.
Posted on Dec 22, 2009
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