Dash problems...sigh - Impala Tech
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post #1 of 3 (permalink) Old 03-05-2010, 04:40 PM Thread Starter
Join Date: Mar 2010
Location: Utah
Posts: 1
Dash problems...sigh

My 04 Impala LS is having some serious issue's with the dash lights & gauges. When the head light sensor turns my head lights on, my dash lighs (all of them) dim to non existent, I keep a flash light in my cup holder so I can see how fast I'm going. My speedometer seems to work while driving but after an hour shuts off & my security light come on while I'm driving & activates the Pass Lock at random. Sometimes I can start my car & sometimes I'm stuck in a parking lot for 20 min. or so.

Please some one help, I'm desparate!!
PrettyBarberella is offline  
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post #2 of 3 (permalink) Old 03-18-2010, 10:46 AM
Join Date: Nov 2009
Location: Sapulpa OK
Posts: 58
"Most" problems with electronics in autos is related to bad grounds. I'm not familiar with the wiring scheme on your car, but it probably has some grounding points connecting the dash module(s) to the body/chassis. Be sure all connections, nuts, bolts are clean and tight.

Dave Bradley
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post #3 of 3 (permalink) Old 03-25-2010, 07:02 AM
Join Date: May 2009
Location: Mobile, AL
Posts: 82
Melissa, it sounds like you have an actual internal IPC (instrument panel cluster) issue or one other possibility is a BCM (body control module) concern. The IPC on this car is a slave unit that only displays what it is told to by other modules via serial data (communication) lines. The BCM is, for lack of a better term, the master communications module for the rest of the car. The theft deterrent system logic is also in the BCM which could explain the intermittent no start. I would bet there are codes all over the modules of this car. If any one module on the data line circuit has some type of internal issue, it can actually cause others to malfunction when the fault is present. Nutshell---you need to get the car to a reputable shop with someone who is SHARP with the way these systems function and my guess is it can be diagnosed in 1-2 hours.

ASE & GM certified master technician, and no, I don't think I know it all.
ujsf01 is offline  
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