Non working dash / instruments panel illumination [Archive] - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum

: Non working dash / instruments panel illumination


eddy2
07-01-2011, 05:04 PM
Hi TrailVoy enthusiasts:

I installed LEDs replacing the eight OEM bulbs (dome lights, 2 each door) in my Envoy 2004, L6. Now my dash/instrument panel illumination is not working.

I did check the following fuses and they all are OK:
Under hood
#24
and all others

under the driver side rear seat
TBC2 fuse #7
TBC5 fuse #32
and all others.

I found blown-out and replaced fuse #4 under driver rear seat.

Instruments work well and radio illumination dims OK, it only the dash/instruments panel illumination that does not work.

What could be causing this problem?

Thanks, Ed

eddy2
07-01-2011, 06:36 PM
Hi TrailVoy enthusiasts:

I installed LEDs replacing the eight OEM bulbs (dome lights, 2 each door) in my Envoy 2004, L6. Now my dash/instrument panel illumination is not working.

I did check the following fuses and they all are OK:
Under hood
#24
and all others

under the driver side rear seat
TBC2 fuse #7
TBC5 fuse #32
and all others.

I found blown-out and replaced fuse #4 under driver rear seat.

Instruments work well and radio illumination dims OK, it only the dash/instruments panel illumination that does not work.

What could be causing this problem?

Thanks, Ed

freddyboy61
07-01-2011, 07:55 PM
Ed, no need to double post for the same problem.:nono:

Apparently, your replacement of the interior light with LEDs may have caused your instrument lighting issue. Recommend also checking (with a meter preferably) rear panel fuses 31 and 40. Beyond that I don't know what else to check.

eddy2
07-01-2011, 09:46 PM
Thanks for replying... everything else works: dome lights, all gauges, radio, left/right turn lights, etc. Only panel illumination does not work. Being far from an expert, i tend to think that maybe panel illumination bulbs burned-out but... all of them? :confused:

eddy2
07-01-2011, 10:13 PM
Where exactly do i need to look for the "wiring harness to the cluster"? Please be more specific, i will try that tomorrow. Also, if it is not that brown cable, what other could be?

the roadie
07-02-2011, 10:56 AM
Instrument panel power:
Orange on pin A2 - on all the time by way of front fuse #24
Pink on B7, on with RUN/START by way of front fuse #22.

Ground:
Black on A5

Dimmable lamp control:
Brown/white stripe on pin A7

eddy2
07-02-2011, 11:36 AM
I appreciated all the help. It seems that i will have fun this long weekend.

the roadie
07-02-2011, 11:45 AM
Nah. FUN is having to change a fan clutch. REAL FUN is a rear axle or transfer case swap. Gauge lights are only "fun" if you take the long way around to get at its connector:

http://www.roadie.org/dash07.jpg

ChevyTb2003
07-02-2011, 01:34 PM
nice roadie. and for the guy with the leds.. did you put 470ohm 1/2 watt resistors on each bulb? there are other threads on here that tell more about it. no resistors will cause all the bulbs to blow. *happened to me*

eddy2
07-02-2011, 07:49 PM
Wao, scary pictures... don't do that to me please. :bonk:

Well two things that i have to point out folks:
1. What is working?
a) Radio lights, turn on and dim ok.
b) Windows/power lock controls on door panels, illuminate and dim ok.
c) Gauges and DIC are working OK.

2. What is not working?
a) Instrument panel illumination, does not turn on.
b) A/C control panel illumination is not working, A/c works ok though.

Regarding the LEDs, they were not marked. I did not use any resistor or anything else, just installed them. I can remove them if needed to solve the other problems.

Based on the above details, i believe that it wont help if i take out the instrument panel since the A/C module is not illuminating neither.

Please continue to share your comments and suggestions. What can i do to resolve this?

Ed.

the roadie
07-02-2011, 08:44 PM
Regarding the LEDs, they were not marked. I did not use any resistor or anything else, just installed them. I can remove them if needed to solve the other problems.Where did you buy them, and were they marketed as being for automotive use? If you just bought naked LEDs at Radio Shack or an electronic component store, the polarity of the LEDs is indicated in the length of the lead. One of its wires is longer than the other, and that's the anode, or the positive side. The cathode is shorter (sometimes the plastic case is molded with a flat on this side as well), and that one goes to ground. These sorts of LEDs cannot just be soldered into place without a resistor in series with either one leg or the other. And you have to put the anode on the positive terminal, which requires a meter before powering off the board. Sometimes, the cathode/ground side of a lamp socket is a square pad instead of round.

Based on the above details, i believe that it wont help if i take out the instrument panel since the A/C module is not illuminating neither.The AC control module shares the lamp circuit with the instrument panel, but also the radio, transfer case control switch that you don't have, and the rear wiper control switch. I can't explain how your radio is staying on while these other lamps are dead.

Let us know about the source of your LEDs.

RayVoy
07-02-2011, 09:27 PM
If, all you changed were the ceiling lights, you could not have blown a fuse for the instrument panel lights.

If other "night time driving" lights are working (like the window switch illumination), then check the position of the dash brightness rheostat. Do you have it turned down, or off?

RayVoy
07-02-2011, 09:44 PM
eddy, here is the problem with double posting, ya got people answering in both threads.

Looks like this thread is chasing a lot of complicated suggestions, I, answering in the other thread, have suggested a simple answer to your problem: http://forums.trailvoy.com/showthread.php?t=88787

eddy2
07-02-2011, 10:37 PM
Thanks for your replies guys!!! Please note that i double posted by a mistake and inadvertently. I am following only this thread, sorry about the confusion; the other tread can be deleted.

About my problem... What i installed was ebay item 180563700093, installed two on each door dome light, they are working OK.

During the installation of the leads, fuse #4 burned-out and i replaced it. I did not mess with anything else.

If the "the dash brightness rheostat" refers to the knob that dims the panel/radio/window/power locks/AC; that is dimming the radio and window/power lock controls so i guess it is OK.


So, considering what i mentioned that is working and not working:

what can be causing this problem?

Should i remove the led bulbs? (I do not want to deal with resistors or similar things).

Thanks, Ed

eddy2
07-03-2011, 01:04 PM
Guys:

I did remove the LEDs, still no luck. "The roadie" and "Blckshdw" mentioned that i should check the following in the instrument panel cluster:

Instrument panel power:
Orange on pin A2 - on all the time by way of front fuse #24
Pink on B7, on with RUN/START by way of front fuse #22.

Ground:
Black on A5

Dimmable lamp control:
Brown/white stripe on pin A7

I will check on that as soon as it stops raining here :). Though the A/C panel lights and the steering wheel radio and cruise controls illumination
are not working either, there is still a remote possibility that all these bulbs were burned-out. As mentioned, controls in the driver door and radio
illuminates and dim OK though.

If not other suggestion, i will be checking on the instrument panel cluster.

Thanks all for the help, i appreciated.

Ed

eddy2
07-04-2011, 12:47 PM
Hi guys !!!

Good news... after taking a closer look to fuse #7 under the driver side passenger seat, i found that it was not making a good/firm contact, sometimes was working and sometimes it was not. I adjusted the connectors and that FIXED the problem. Now i have panel and A/C module illumination.

Thanks to this site and to its contributors (you guys!!!). :tiphat

Ed

RayVoy
07-04-2011, 09:29 PM
Good job eddy :thumbsup:, we didn't do much, you deserve all of the credit :tiphat