Help! 07 Tahoe Message Center Went Blank

[cweese]

Please help. Started up the tahoe and everything was working fine. A few seconds passed by and then the message center went totally blank and the gear selector on the instrument panel (P, R, N, D, 3, 2, 1) is so dim that we can hardly see it. Everything else works normal in the instrument panel (spedo, pressure gauges, etc). The manual dimmer switch for the entire instrument panel is set as high as it will go before turning on the dome light. Any ideas are greatly appreciated!

[Doug_Scott]

Please help. Started up the tahoe and everything was working fine. A few seconds passed by and then the message center went totally blank and the gear selector on the instrument panel (P, R, N, D, 3, 2, 1) is so dim that we can hardly see it. Everything else works normal in the instrument panel (spedo, pressure gauges, etc). The manual dimmer switch for the entire instrument panel is set as high as it will go before turning on the dome light. Any ideas are greatly appreciated!

 

Probably a stupid idea, but you sure the headlights aren't on? Have you looked that dash after it gets dark outside? With the sun out and headlights on, backlit things go very dim, analog gauges will still look the same, but digital outputs will be very dim with the sun out.

[cweese]

Thanks for the suggestion, Doug. Yes i have tried it with the headlights on & off and nothing changes. The message center is still blank. I have had the drls disabled since ive owned it and we drive it both day and night. Everything else works just like it should. I really hope I can figure this out because I don't want to have to take it to the stealership. I just wonder if a connection somehow can loose somewhere but I don't have a clue of where to start looking. Any more ideas?

[cweese]

btt

[BigBlueLB756]

Check fuses.

[cweese]

I have checked all the fuses and everything is good. I'm totally baffeled at what's wrong here. Anymore ideas, anybody?

[ujtruck]

if you don't have all those fancy tools and service manual, then its time to visit your local dealer or someone who understand "- +"

 

if you have a good code scanner - hook it now and scan, see if you have:

DTC B3567

B3567 01: Driver Information Center (DIC) Select Switch Circuit Short To Battery

B3567 59: Driver Information Center (DIC) Select Switch Circuit/Component Protection Time-Out

 

 

Circuit/System Description

The driver information switches are normally open momentary switches. Power is provided to the

driver information center (DIC) switches via the instrument panel cluster (IPC). The IPC

interfaces with the DIC switches via 3 discreet circuits. The switch input to the cluster is pulled

low or grounded when a switch is activated. The IPC reads the voltage at the analog input to

determine which switches is pressed. The switch input to the cluster is set up in a resistor ladder

format for three of the four switches. The DIC switches include the PERSONALIZATION,

SET/RESET, TRIP/FUEL, AND VEHICLE INFO switches. A stuck switch or a short to battery

sets a DTC.

 

if you do have DTC B3567

 

 

1. Ignition OFF, disconnect the harness connector at the DIC switch assembly.

2. Ignition OFF, test for less than 1 ohm between the low reference terminal 2 and ground.

If greater than the specified range, test the low reference circuit for an open/high

resistance.

3. Ignition OFF, test for less than 1 ohm between the ground terminal 5 and ground.

If greater than the specified range, test the ground circuit for an open/high resistance.

4. Ignition ON, verify that all of the scan tool DIC Switch parameters are Inactive.

If any are not Inactive, test the appropriate signal circuit terminal 1 or terminal 3 for a

short to ground. If the circuit tests normal, replace the IPC.

5. Ignition ON, install a 3-amp fused jumper wire between the signal circuit terminal 1 and the

low reference circuit terminal 2. Verify the scan tool DIC Switch parameters, except the

DIC Fuel Info. parameter, are Active.

 

If any are not Active, test the signal circuit for a short to voltage or an open/high

resistance. If the circuit tests normal, replace the IPC.

6. Ignition ON, install a 3-amp fused jumper wire between the signal circuit terminal 3 and

ground. Verify the scan tool DIC Fuel Info. parameter is Active.

If not Active, test the signal circuit for a short to voltage or and open/high resistance. If

the circuit tests normal, replace the IPC.

7. If all the circuits test normal, test or replace the DIC switch assembly.

 

my .02 cent worth

[Gmcguy228]

I had the same problem with mine, I took it to my mechanic and he referred me to a guy that did instrument cluster repairs. He got it fixed and gave me a warranty with it. It cost $125 but I didn't have to get taped at the dealer for a new instrument cluster. I'll post the link to his website... http://clustersurgeon.com/ hope that helps

[markemark513]

im trying to build the DIC myself because the cheapest i could find was $90 on ebay. i found the diagram and all i need is 4 push buttons and three resistors. but in the diagram it wont tell me the value of the resisters. i have the pdf that i am attaching the link with here http://arrc.ebscohost.com/statics/p5/pdfs/vf_wiring/va277702.pdf#toolbar=1&navpanes=0&scrollbar=1

 

is anybody willing to open theirs up and take a look or even check the resistance from pin 1 and 3 from when each button is pressed besides the fuel/trip button?

[Gasl20]

I have the same problem. Can anyone suggest how this problem is solved independently?

[Tujuan]

I have same exact problem. Can anyone post their final success story details? Seems like a very specific problem fix since the drive gear position indicator is dimmed to barely visible with all else blanked.

[swathdiver]

2 hours ago, Tujuan said:

I have same exact problem. Can anyone post their final success story details? Seems like a very specific problem fix since the drive gear position indicator is dimmed to barely visible with all else blanked.

Get with this guy:

 

[dpasek]

This problem is caused by a bad LL2705 mosfet in the instrument cluster. It is a 75 cent part and it's located near the lower right corner of the DIC vacuum fluorescent display module. The cluster needs to be disassembled to accomplish the remove/replace/resolder repair.