1999 suburban interior light issues

cwh13 · #1 04-10-2008, 09:09 AM

I bought a 1999 suburban used and am having a few issues with it. Soon after I got it home when you drive it the interior lights started flickering and when the keys were pulled they would stay on and drain the battery down. Now they don't flicker but they stay on. The only way to get them off is to use the dome overide button. When they were flickering you could hear a relay chattering in the dash. Is there a relay specifically for the interior lights or does the 1999 classic suburban have a BCM (body control module) light the new body style 1999 trucks. I checked all the door switches and they all seem to be ok.

Thanks,

Chris

777stickman · #2 04-10-2008, 10:38 AM

Your '99 Sub (OBS) does not have a BCM. It does have an Interior Light Control Module located under the center of the I/P which is probably where the relay noise is coming from.

Other components are: Light sw, door sw's, Remote Keyless entry and wiring.

Cheers and Good Luck.

brcidd · #3 04-10-2008, 10:50 AM

I saw this a year ago or so on a '99 Tahoe- it's the LCM (light control module) as mentioned above-- sit down when you price it! Or use a salvage yard- good luck trying to get the salvage yard to tell you if they have it over the phone-- it is not normally catalogued....

dablonde · #4 04-10-2008, 12:36 PM

Personally, I just use the dome override switch and leave it since that's really the least of my worries. Of course, you need to be careful with those back barn doors. My daughter's boyfriend left the door open just a tad the other day. Just enough to keep the lights on I guess and I came out to a dead battery on Monday morning. It was 4 yrs old though and wouldn't take a charge, so another $120 had to be shelled out. That's after spending $2,800 two weeks ago on rebuilding the transfer case and purchasing new tires (uneven tire wear blew the case).

Anyway, enough my b-ing. Have fun with your new/used Burb.

cwh13 · #5 04-11-2008, 01:27 AM

Picked up a new lcm from the dealer today. $28 dollars and change. Now I need to find out where it goes. I was up under the dash just now and couldn't find the rascal to save my life. Any more insight to where its located. 777stickman, under the I/P? Instrument panel? Center. I'll take another look but I may not have the right component as I didn't see anything like I purchased.

Thanks,

Chris

Tore the dash apart again. Couldn't find it. I'll head to the library and look through the component location book.

brcidd · #6 04-11-2008, 10:52 AM

It is right above the hump-- maybe this will help- it is object #2 in the below photo: to be sure you have the right module- it is a five wire module gray, orange, white, pink, black- this should help you find the right wiring harness.....

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777stickman · #7 04-11-2008, 11:04 AM

I/P=Instrument Panel. Look for 5 wires: Gray, White, Orange, Pink & Black.

clamfoot · #8 05-01-2008, 11:16 AM

my 99 suburban Dome lights along with the keyless remote wont work after having replaced door lock actuaters.I have checed fuses and tried resetting transmitter still nothing.Any thoughts here?

odojak · #9 05-10-2008, 04:04 PM

Quote:

Originally Posted by clamfoot

my 99 suburban Dome lights along with the keyless remote wont work after having replaced door lock actuaters.I have checed fuses and tried resetting transmitter still nothing.Any thoughts here?

no

chevylove1 · #10 05-13-2008, 07:53 PM

Im suffering the exact same problem. Im looking for the location of the rke so I can start there. I feel your pain.

JKHEND58 · #11 12-10-2008, 01:02 PM

I was having this same issue. I replaced the front door switches and it cured the problem. Do the switches first. I got mine at the dealer for $10 each. It is an easy fix. You pull the switches from the outside and they will come apart. Then reach under the dash and locate the connector side and unconnect and remove the inside part of the old switch. Feed the connector back through the hole and connect to the new switch. Push the switch back into the hole.
Note: on the passanger side, you will need to remove the glove box. Just pull the hold strap from the left side of the glove box toward you and slip it out of the anchor point. The glove box will now drop out. You may have to flex the right side of the glove box to clear the opening.
Hope this helps someone.

clamfoot · #12 07-12-2011, 11:32 PM

does anyone know how to check a lcm on 99 brb?

MT-2500 · #13 07-13-2011, 07:08 AM

Quote:

Originally Posted by clamfoot

does anyone know how to check a lcm on 99 brb?

If it was a snake it would have done bite you.

Go to.
POST no. 6

777stickman · #14 07-13-2011, 08:52 PM

Quote:

Originally Posted by clamfoot

does anyone know how to check a lcm on 99 brb?

If you mean "how to check the module for good or bad", then there is no procedure in the service manual for that. It would take a schematic of the C/B and considerable skills to do that. The LCM is called a "non-serviceable replacement unit". This means that after you have gone thru 23 steps of checking for power, grounds, wiring, etc, etc, then you replace the module and hope for the best.

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