Dome Light Stays on...

[EmersonHart13]

99 Suburban, only way I can get the dome light off is to use the dome override button. The lights go on for every door but do not turn off. I believe that rules out the door switches?

Ideas?

Click to read more...

 

[bikrboy128]

dumb question (but i cant count how many times this has happened to customers of mine) is the dimmer switch off? if it is, my first guess would be door switch. are the door switches stand alone? or are they part of the door latch?
if they're stand along switches, remove them and measure the resistance

 

[EmersonHart13]

The door switches are the seperate plunger type. Problem with that is they are supposedly difficult to remove and break easily.

Is it possible that the switches will turn the lights on but not off?

 

[Dasfinc]

Is the tailgate/Barn doors supposed to turn this light on also? The latch/switch mechanism on the backs of SUVs can get filled with Crap pretty easily that will stick the switch on.

 

[EmersonHart13]

Barn doors and yes they turn the lights on. I cleaned the connectors on that too just to be sure.

 

[Turbocharged400sbc]

is it just the dome lights or are the footwell/courtesy lights and map/reading lights also going on?

also need to know base model or luxury from the seperate switches id guess base as the luxury is in the actual door latches

on both the switches tell the bcm and the bcm controls the courtesy lamp relay or inadvertant power relay (luxury only) both in isnt panel fuse/relay block

 

[EmersonHart13]

All of the entry lights come on and stay on.

It is an LS with leather, power everything, and CD... No heated seats though. I don't know what defines luxury I guess?

ummmmmmmmmmmm yeah...............

 

[bikrboy128]

The door switches are the seperate plunger type. Problem with that is they are supposedly difficult to remove and break easily.

Is it possible that the switches will turn the lights on but not off?

if one of them is stuck open the BCM will keep the lights on thinking a door is open...if that makes sense.
spray them with PB blaster and pray they dont break
or, if you have access to a tech 2 or other scan tool that will read the BCM, that should tell you what door is reading open.

 

[Turbocharged400sbc]

if you can get to the bcm you can check which pin is grounded with all the doors closed, that will tell you which switch without having to pull/break em.

the door switches ground the bcm input for that door when it is opened...

 

[Turbocharged400sbc]

do you have access to a dvom or at least a test light?
ill try to pullup the BCM pinout and give you the 4 door switch wire colors and pin locations since im guessing you have the base package with a few upgrades

 

[EmersonHart13]

I so have a tester so I can check the pin outs.

 

[smug]

:csi::xzbit::likes:kay::ca:

 

[Turbocharged400sbc]

what is the date of manufacture on the door jamb sticker? seems that there's a chance you have a model split that affects the diagrams used.

 

[Turbocharged400sbc]

late 99/00 shows 4 seperate inputs to bcm for door switches...
98-99 have them all splicing into a single lead at the interior lamp control module (w/o keyless entry)
or have them splicing into a single line at the remote control door lock reciever (with RKE)

 

[Turbocharged400sbc]

on the older diagrams:
the door switches come together at S208 and its the purple wire at pin L of the headlight/dimmer/(going to the dome light defeat switch which opens the circuit)
the grey wire at pin B is where it leavs the switch and goes to the RKE/int lamp control module
if you have a ground at the purple, one of your switches is toast or the wire is shorted to ground

regardless s208 makes it imposible for you to figure out which switch it is...the easy way

 

[EmersonHart13]

 

[Turbocharged400sbc]

well 12 of 98 would deffinatly be a 99 diagram so your screwed for the easy way of finding which switch it is....
i cannot find an rpo for the remote keyless entry but since you have a few uplevel options im gonna guess you do have a remote?

 

[EmersonHart13]

Bought it used but no remote came with it....

 

[Turbocharged400sbc]

well id start at the switches...go around to each switch in turn and depress em and feel for "one of these things is not like the others"
look for signs of a door being shut onto a seat belt buckle/obvious damage.

if nothing obvious is found i would start at the drivers door switch (3 wires which also grounds a tan wire for the audible key in ignition dinger) and the cargo door switch as these are most often used on most of the suburbans ive worked on.

door switch removal, obviously disregard battery disconnecting as youll be wanting to see which switch (in turn) kills the lights when unplugged
REMOVAL PROCEDURE

CAUTION: Refer to Battery Disconnect Caution in Cautions and Notices.

1. Disconnect the negative battery cable.
2. Locate the door jamb switch. The switch is under the left side of the instrument panel.
3. Squeeze together the tangs of the switch.
4. Push the switch through the side of the instrument panel.
5. Disconnect the electrical connector of the door jamb switch.
6. Remove the door jamb switch.

liftgate/cargo
REMOVAL PROCEDURE

CAUTION: Refer to Battery Disconnect Caution in Cautions and Notices.

1. Disconnect the negative battery cable(s).
2. Unthread the switch from the vehicle. Remove the switch.
3. Disconnect the electrical connector.

Door Jamb Switch Front Door 88891785 $8.66 Rear Door 15693389 $13.36 Tailgate Door 15676080 $22.00