Jim Grant's Tech Tips
99 Jeep Grand Cherokee, Dying Dash Display
The instrument panel, along with my overhead diagnosis is not working on my 99 Jeep Grand Cherokee. When I disconnect the battery for a few hours, it all starts working normal, but after a few minutes to hours, it starts doing the same thing: all the gauges are dead.
The next time the dash display goes down on your Jeep don’t disconnect the battery. Instead go to your Jeep dealer or a repair facility with the correct computer scan tools and have them perform a check of the Body Control Module (BCM). Because the instrument panel display and the overhead display are both going down it may be that the BCM has a problem. But getting into the system with a computer scan tool is critical. You’ll want to know if there are any codes in the system that could be causing communication problems. If there are no codes present, then a function test can be performed via a scan tool. The function test allows the technician to command dash gauges and warning lights to cycle. BCM’s do fail and replacements are costly. You’ll want to be sure that there are no other system or connection problems before you replace the BCM.