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HELP! Interior lights (map and dome) dim but do not go out. Fuse removed.
The interior lights (passenger dome and front map) in my 2003 suddenly will not turn off all the way. They remain on, all the time at about 1/2 brightness. However, when the doors are opened or the switches toggled, they come on to full brightness as expected. The "off" swithch on the dome light only keeps it from coming on full with the door.
I tried to disconnect the battery and discharge to wiring harness in an attempt to clear a computer error, but no luck, I had to finally remove the fuse to turn them off.
Obviously, there is now no interior lighting except for the front door lights. BTW, the rear cargo light was not effected until the fuse was pulled.
Thanks
I am unable to find any loose ground wiring. I have heard that the Body Control Module (BCM) controls the timing of the interior lights. After the doors are close, the lights fade off rather then simply turn off. It's like they are fading to off, but stop just short. Is it possible that the BCM needs a "flash"? ThanksI am unable to find any loose ground wiring. I have heard that the Body Control Module (BCM) controls the timing of the interior lights. After the doors are close, the lights fade off rather then simply turn off. It's like they are fading to off, but stop just short. Is it possible that the BCM needs a "flash"? Thanks
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Re: HELP! Interior lights (map and dome) dim but do not...
There is a short between the dome light and the door switches, this can be caused by something as simple as water damage. check all the wires and switches before you think it is the BCM.
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Interior lights and the power door locks are controlled by a electronic control module . Hooking up a factory or some other type professional scan tool an checking for codes an viewing input data to these control modules would be the first thing to do.
The interior lighting system consists of the following:
lighting control module (LCM)
driver door module (DDM)
instrument panel
dome/map combination
courtesy/reading lamps
orientation light
door lamps
footwell lamps
luggage compartment lamp
glove compartment lamp
vanity mirrors
door ajar switches
viewing wiring diagrams an checking power and ground circuits for these modules would be the next step if no codes were found . Principles of Operation
Lighting Control Module
This vehicle uses a lighting control module (LCM). The LCM is a microprocessor-based module that controls several vehicle subsystems, responds to electrical input signals from various switches, sensors, and external modules and is located on the LH side of the instrument panel. LCM subsystem functions include:
headlamps with autolamps
turn signal lamps/hazard flasher lamps
cornering lamps
parking lamps
daytime running lamps
interior lamps
demand lamps
battery saver
The LCM interfaces with the driver door module (DDM) via the standard corporate protocol (SCP) network for the illuminated entry feature.
The interior lamp is illuminated by pressing the individual interior lamp switch. The interior lamp is also illuminated by door ajar switches located in the door latches, when any door is opened. A theater lighting feature gradually increases or decreases the light intensity when switched by opening or closing a door.
The dome/map lamp combination are located on each side of the interior lamp. The map lamps are operated independently of the interior lamp by two switches located on the interior lamps.
The interior lamps are illuminated by holding the panel dim switch in the UP position until the dome lamps turn on. The interior lamp also illuminates when a door is opened and actuates the door ajar warning lamp switch in the door latch.
The front map lamps are powered by the demand lighting circuit and the interior lighting circuit.
The rear passenger reading lamps are incorporated into the rear seat assist handle and are located over the rear door openings. These lamps are illuminated through power supplied by the LCM demand lighting circuit.
Interior lamps (controlled by the LCM) are activated by using the dome lamp switch (instant ON/OFF response) or when a door is ajar. The following lamps illuminate for interior lighting:
instrument panel interior lamps
front map lamps
rear reading lamps
door lamps
Demand lighting includes lamps that are illuminated by the customer by directly actuating a switch. The front dome/map lamps are located in the overhead console. Each lamp is controlled by its own switch.
The following demand lamps are powered by the demand lighting output of the LCM:
glove compartment lamp
vanity mirror lamp
luggage compartment lamp
Each lamp has a dedicated switch that closes to ground to illuminate the lamp.
The front map lamps are powered by either the demand lighting circuit or the interior lighting circuit, depending upon the position of the switch associated with each lamp. When the customer turns the front map lamp switch ON, the front map lamp is illuminated through power supplied by the LCM demand lighting circuit. If the customer moves the map lamp switch to the OFF position, the power from the LCM demand lighting circuit is interrupted and the lamp is reconnected to the interior lighting circuit.
The rear reading lamps are powered by either the interior lighting circuit or the demand lighting circuit.
The luggage compartment lamp is controlled by the trunk ajar switch, and is powered by the demand lighting output from the LCM, and is mounted near the center of the upper rear panel.
The glove compartment lamp system consists of a glove compartment lamp switch and wire and miniature bulb assembly. Opening the glove compartment door closes the switch which provides power to the glove compartment lamp switch and wire. The glove compartment lamp switch is grounded to the body sheet metal.
The vanity mirror lamp system consists of a switch and bulb assembly in the RH inside visor and the LH inside visor. Lifting the vanity mirror cover closes the vanity mirror lamp switch and provides power to the lamps.
The illuminated entry system is controlled by the LCM and provides interior lighting upon entry to the vehicle.
Interior lamps will be illuminated for 25 (±1) seconds which includes a theater lighting ramp-up time (0.5 seconds). This time interval does not include the theater lighting ramp-down time. Interior lamps will be turned off before the 25 (±1)-second timeout if the ignition switch is turned to the RUN or ACC position.
The illuminated entry system has the following additions to accommodate the remote entry system: pressing the unlock button on the remote transmitter will activate the illuminated entry system (with theater ramp-up). When the driver door module detects a button press, it sends a signal on the J1850 communication network activating the interior lamps. The lighting control module will turn off the lamps by sensing the all doors lock signal.
The battery saver feature prevents excessive drain from loads inadvertently left on. When the ignition switch is turned OFF, power is interrupted to the interior lamps and headlamps (after a 10-minute timeout) and the demand lamps (after a 30-minute timeout).
The battery saver has the following inputs:
Check the dome light switch. I believe its between the map lights in the front overhead console. You can set it to Always Off, On with Doors, or Always On.
The Dome light and the cargo area light should come on when the door is open and the switch is set to door position, or when set to the always on position.
If only one of the lights come on change the bulb of that light. If neither light comes on change the fuse.
I believe the instrument panel fuse block is located on the passenger side of the center console, to the left of the glove box near the floor. The cover usual lists where and what each fuse does. Look for Interior Lighting, I believe #23. Pull the fuse and check if its broken. If it is replace it. If not you may have electrical issues.
Your passenger window motor is most likely the problem. It could be the switch. If you get into your car and key on engine off. Turn your interior lights on and try to operate the window....Look at the brightest interior light/dome lamp and see if it dims while you are trying to operate the switch....It may be hard to see but if it dims at all the motor is locked up and is pulling amperage from the battery. This is just a rule of thumb however it has never failed me as the motor pulling amperage is the only way that the lights will dim. if not it could be the switch. Hope this helps
hello,interior light you means front dome light?front dome get power supply from control unit under your fuse box,if you want remove your dome light, check wiring color light brown in socket mark c if no voltage,check wiring for continuity up to control unit,if you think it complicated,send to your dealer,ty
Might sound funny but check the rheostat knob that dims the interior lights, sounds like its set to always on. Check the dome light too, some have always on and on when door is open settings.
I am unable to find any loose ground wiring. I have heard that the Body Control Module (BCM) controls the timing of the interior lights. After the doors are close, the lights fade off rather then simply turn off. It's like they are fading to off, but stop just short. Is it possible that the BCM needs a "flash"? Thanks
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