2003 GMC Yukon Denali Gauge lights not working...

[rsparrish82]

Hello,

I am new to this forum but have looked it over quite a bit and have not seen anything yet that describes my situation. I recently purchased a 03 Yukon Denali for a relatively fair price, mechanically sound, exterior and interior are in great shape, all around a good purchase.

My question is this... What would cause my gauge lights to stop working? All of the other interior lights work with the dimmer switch and even the info center in the cluster along with the PRND321 work with the dimmer just fine. Just no gauge illumination all of a sudden tonight when i went to go home from work. I cannot find any specific fuses to check, and they all worked last night while i was driving with no issue. All of the gauges and warning lights/turn indicators work just fine too. I am really stumped. Any help would be greatly appreciated! Thank you!

 

[adventurenali92]

Usually what happens to these clusters in this generation is the backlighting that’s soldered into the electrical board inside the cluster burns out. But I haven’t seen them all go out together. Usually they start flickering one or two at a time until the bulb burns itself out. It’s a possibility but because they’re all going out at once I’d suspect an electrical connection first. Possibly a loose harness connection on the back side of the cluster. Or possibly the electrical board inside the cluster has some loose connections that could be needing a reflow of the solder joints. It could be a fuse issue but I don’t know that there’s a separate fuse for the cluster backlighting. Maybe check the fuse panel beside the steering column and then possibly the under hood fuse box. Do you have the owners manual for it? There’s a list of all the fuses, with what they go to and their locations, in the maintenance section of the owners manual. I would start with checking the harness connection at the back of the cluster first.

The dash bezel around the cluster and radio are just clip style fasteners that pop into the dash piece. The bezel can be removed by gently working each edge of the bezel lose, and then once all the clips have been released, put your column shifter down into first with the key in acc, without starting the engine, foot on the brake and parking brake set, and dropping the steering wheel all the way down. The bezel will slide up and out. There are 4 I believe either 8 or 10mm headed bolts to remove, one at each corner of the cluster, and then the cluster will slide out as well. If the connection isn’t showing any signs of being loose, or any damaged wires, then I would start looking inside the cluster. Plastic clips on the back side of the cluster keep the plastic lens held on. Pop them loose and then once the clear plastic lens is off, you can pull the gauge needles and the face with all the gauges on it off. That will give access to the bulbs, and then the back side of that center piece that keeps the lighting, has the stepper motors that run your needles around the gauges, and the electrical component board that powers the cluster.

There are lots of YouTube how-tos on pulling the cluster apart and diagnosing their issues that I found helpful when I redid all my cluster backlighting from burnt out bulbs.

 

[rsparrish82]

Usually what happens to these clusters in this generation is the backlighting that’s soldered into the electrical board inside the cluster burns out. But I haven’t seen them all go out together. Usually they start flickering one or two at a time until the bulb burns itself out. It’s a possibility but because they’re all going out at once I’d suspect an electrical connection first. Possibly a loose harness connection on the back side of the cluster. Or possibly the electrical board inside the cluster has some loose connections that could be needing a reflow of the solder joints. It could be a fuse issue but I don’t know that there’s a separate fuse for the cluster backlighting. Maybe check the fuse panel beside the steering column and then possibly the under hood fuse box. Do you have the owners manual for it? There’s a list of all the fuses, with what they go to and their locations, in the maintenance section of the owners manual. I would start with checking the harness connection at the back of the cluster first.

The dash bezel around the cluster and radio are just clip style fasteners that pop into the dash piece. The bezel can be removed by gently working each edge of the bezel lose, and then once all the clips have been released, put your column shifter down into first with the key in acc, without starting the engine, foot on the brake and parking brake set, and dropping the steering wheel all the way down. The bezel will slide up and out. There are 4 I believe either 8 or 10mm headed bolts to remove, one at each corner of the cluster, and then the cluster will slide out as well. If the connection isn’t showing any signs of being loose, or any damaged wires, then I would start looking inside the cluster. Plastic clips on the back side of the cluster keep the plastic lens held on. Pop them loose and then once the clear plastic lens is off, you can pull the gauge needles and the face with all the gauges on it off. That will give access to the bulbs, and then the back side of that center piece that keeps the lighting, has the stepper motors that run your needles around the gauges, and the electrical component board that powers the cluster.

There are lots of YouTube how-tos on pulling the cluster apart and diagnosing their issues that I found helpful when I redid all my cluster backlighting from burnt out bulbs.

Thank you for the info, I will pull the cluster in the morning to check. The previous owner said that the info bar (DiC as i see it s called) will intermittently go blank, and as I have not experienced that yet, I assume I will, as I have only had it a couple of days. I dont have any means personally to reflow any solder, so I wont be able to do that part, but I will take the cluster apart and check bulbs. Would you recommend me looking into a cluster repair service or buying another one and having it reprogrammed if I cannot find anything immediately visible?

 

[rsparrish82]

Okay, so here is what I found when I got the cluster out and apart. I followed a few very detailed videos on YouTube on the teardown and got down to the board. As far as i can tell all the bulbs are still good (clear glass, filaments still intact) So i am guessing at this point it has definitely to do with solder joints or resistors on the board (as i saw mentioned in one of the videos). There is another 03 Denali at my local pick n pull that i was going to go check out anyways on Friday, so maybe i should pull the cluster from that as well and try and do a swap and see if in fact it the cluster board itself is bad or something else, so i don't have to immediately resort to sending mine out for repair. If it does work, I will find a reputable place to reprogram the "new" one.

i do have the owner's manual, and did some google searching as well, and there in fact, is no separate fuse for the cluster illumination that i could find, it all seems to be tied in to the electrical system and controlled by the dimmer switch, but since the dimmer switch works for everything else including PRNDL and DIC, i think it is most likely a board issue.

 

[Fless]

You can find wiring diagrams on www.charm.li.

Instrument Cluster / Carrier — 2003 GMC K 1500 Yukon 4WD V8-5.3L VIN T Service Manual | Operation CHARM

Detailed repair manual for the 2003 GMC K 1500 Yukon 4WD V8-5.3L VIN T.

charm.li

Also I've attached a PDF of the cluster connector pinout.

 

[TJ Baker]

far as i can tell all the bulbs are still good (clear glass, filaments still intact) So i am guessing at this point it has definitely to do with solder joints or resistors on the board

Given any thought to just applying the power and ground to this circuit to see if it lights?

12 volts DC positive to terminal A11 and ground to terminal A12.

FWIW, there are 2 separate dimming circuits that are adjusted with the dimming switch. Both of these circuits are supplied by the BCM. One is for incandescent bulbs and the other is for LED lamps.

Further, the PRND321 and Odometer lighting is not using either one of those two aforementioned dimming power circuits. The BCM transmits an interior lighting dimming level instruction as a message on the Class II serial data bus. The cluster uses this instructional message to set the brightness level of those 2 cluster displays.

 

[rsparrish82]

You can find wiring diagrams on www.charm.li.

Instrument Cluster / Carrier — 2003 GMC K 1500 Yukon 4WD V8-5.3L VIN T Service Manual | Operation CHARM

Detailed repair manual for the 2003 GMC K 1500 Yukon 4WD V8-5.3L VIN T.

charm.li

Also I've attached a PDF of the cluster connector pinout.

Perfect! Thank you for that.

 

[rsparrish82]

Given any thought to just applying the power and ground to this circuit to see if it lights?

12 volts DC positive to terminal A11 and ground to terminal A12.

FWIW, there are 2 separate dimming circuits that are adjusted with the dimming switch. Both of these circuits are supplied by the BCM. One is for incandescent bulbs and the other is for LED lamps.

Further, the PRND321 and Odometer lighting is not using either one of those two aforementioned dimming power circuits. The BCM transmits an interior lighting dimming level instruction as a message on the Class II serial data bus. The cluster uses this instructional message to set the brightness level of those 2 cluster displays.

Alright, I will have to dig into that this weekend. If in fact the cluster gets power and I am able to get it to illuminate, would you think that the BCM is an issue? I have already encountered the "rear access open" message once and tried a quick fix that involved unplugging the connector from the BCM and plugging it back in firmly, and so far for the last two days that message has not come back. I am beginning to suspect the BCM might be the cause after this recent information. Very fortunate to have this resource of great minds and experience. Thank you all!