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Dash illumination lights and other accessory illumination…

Customer Question
Dash illumination lights and...

Dash illumination lights and other accessory illumination lights aren't working, but flicker on for a second when I drive occasionally.

Mechanic's Assistant: Have you checked the fuses? The dashboard bulbs?

Yep. Replaced every fuse, the bulbs are good because they flash on for a moment when I drive it once in a while.

Mechanic's Assistant: What is the model/year of your Jeep?

1998 Grand Cherokee Laredo 4.0

Mechanic's Assistant: Are you fixing your Grand Cherokee yourself? What have you tried so far?

Myself, yes. I've ruled out the fuses. I've checked all engine bay grounds. I've tore apart the dash and checked for shorting / pinched wires and no luck yet.

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

I did re-did the solder grounds on the headlight switch. Still no luck. That is all.

Submitted: 7 months ago.Category: Jeep
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Answered in 7 hours by:
12/17/2017
Jeep Mechanic: Chris (aka-Moose), Technician replied 7 months ago
Chris (aka-Moose)
Chris (aka-Moose), Technician
Category: Jeep
Satisfied Customers: 52,719
Experience: 16 years of experience
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If you have a volt meter and can do testing while this is occurring I believe I can help you get this figured out.

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Customer reply replied 7 months ago
When I get home from work in the morning I can check continuity with the multimeter.I know the orange wire (illumination wire) runs to all the things I mentioned were out, but I am unsure of where to probe it.
Jeep Mechanic: Chris (aka-Moose), Technician replied 7 months ago

Here is the wire diagram. https://www.dropbox.com/s/mwurvb3nriudtn6/98int.pdf?dl=0

We need to check the orange wire at the BCM for constant or flicking output power. That will tell us if the concern is before or at the BCM or in the wiring after the BCM. Can you get to this point?

Chris

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Customer reply replied 7 months ago
Okay, I am home now. Should I use a a test light, or a multimeter at the BCM plug?
Customer reply replied 7 months ago
Also, on the diagram shows the orange illumination wire going to the "lamp DRVR". What is the lamp drvr?
Jeep Mechanic: Chris (aka-Moose), Technician replied 7 months ago

Aa test light or DVOm will work fine to test it. Lamp DRVR is just the name of the circuit.

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Customer reply replied 7 months ago
Okay. I used the VOM and got 0.2V, test light concluded this as well.
Customer reply replied 7 months ago
I tested at the headlamp switch, and radio
Jeep Mechanic: Chris (aka-Moose), Technician replied 7 months ago

Can you do the test at the BCM?

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Customer reply replied 7 months ago
Just used the test light on the BCM too right plug, got a solid signal.
Customer reply replied 7 months ago
Orange wire, top right plug.
Jeep Mechanic: Chris (aka-Moose), Technician replied 7 months ago

Sice you have power out at the BCM on the orange wire but not at the lamps this means somewhere in the wire harness is a resistance issue not allowing power to flow through.

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Customer reply replied 7 months ago
The BCM orange wire goes to the splice to the rest of the instruments. Where is s209?
Jeep Mechanic: Chris (aka-Moose), Technician replied 7 months ago

Locate the shift interlock and follow its connector to the main harness. The splice 209 will be right there at that junction.

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Customer reply replied 7 months ago
I assuming the shift interlock isin the center console?
Jeep Mechanic: Chris (aka-Moose), Technician replied 7 months ago

Correct

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Jeep Mechanic: Chris (aka-Moose), Technician replied 7 months ago

Do you need a picture location of the shift interlock?

Did you check the splice you found to see if there is power there?

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Customer reply replied 7 months ago
A picture of the interlock would be excellent, thanks.I found a splice where the headlight switch illumination wire, cluster, and radio wire went to. I took apart the splice and interestingly enough the lights still continue to flicker on and off.
Jeep Mechanic: Chris (aka-Moose), Technician replied 7 months ago

I do not have an image due to the age. It states it is on the shift cable at the steering column. I misread earlier when you asked is it in the center console, no it is not.

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Customer reply replied 7 months ago
This is the onlysplice I could find remotely near the steering column. I took it apart to clean / reconnect. Here’s where it’s weird though. Even with those orange wire disconnected, everything still flickers once in a while!
Customer reply replied 7 months ago
Okay, so I tracked the orange wire from the BCM plug to a possible junction box behind the bcm. On the other side of this box, another orange wire comes out and goes up to connect to those orange wires spliced together by the headlight switch.I took a test tight to the spliced orange wires and had power. I am pretty stumped.
Jeep Mechanic: Chris (aka-Moose), Technician replied 7 months ago

It almost sounds like the set of orange wires you are on are not the correct ones for this circuit. Can you unplug the BCM and ohm test the orange wire at each end to see if there is continuity.

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Customer reply replied 7 months ago
The “wire” Goes into a junction type box below the BCM. I’ll try and get an hon meter on it
Jeep Mechanic: Chris (aka-Moose), Technician replied 7 months ago

I am out of diagrams to provide to help.

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