Question about 2004 Chevrolet Avalanche
You can open any of the four doors and the dome light and the two courtesy lights will not come on. But, I can turn all on manually with the rotary brightness switch. Any Ideas??
Check and see if the lights come on with the passenger door, if so you have a defective courtesy light switch inside the door.
Posted on Oct 30, 2012
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Posted on Jan 02, 2017
the actuator for the dome light is actually located inside the lock mechanism. Have you checked to make sure the dome light override button is in the out position?
Posted on Jul 17, 2010
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The liftgate lamps
You can't turn them on manually ?
This could be a BCM problem , this best left to a ASE certified repair shop or the dealer .
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The liftgate lamps
The courtesy lamp supply voltage circuit of the body control module (BCM) supplies battery positive voltage to the dome lamp, the liftgate lamps, and the map lamps. When any door is opened, the door jamb switch contacts close providing a door open input to the BCM. The BCM then provides a ground to the interior lamps with the switch in the AUTO position. The interior lamps receive a ground at G401 with the switch in the ON position.
Important: If the liftgate is opened after all the modules go to sleep, the dome light will not come on. The liftgate ajar switch input to the BCM will not wake up the BCM once it has gone to sleep, so the dome light will not come on. Once the BCM gets an input to wake it up, from remote keyless entry (RKE) or a door handle, the dome light will turn on when the liftgate is opened.
If the driver inadvertently leaves any interior lamp ON, the BCM will turn it OFF after a 20 minute time-out.
The courtesy lamps will turn OFF immediately if the ignition switch is turned to the ON position or approximately 20 seconds after all doors are closed.
The courtesy lamps are controlled by the body control module (BCM). Inputs from the dome lamp switch and the door ajar switches are monitored by the BCM. When a door ajar switch is closed, or the dome lamp switch is turned to the ON position, the BCM supplies the B+ for the courtesy lamps.
With out a factory Tech2 scan tool or equivalent an knowing how these systems work ,you best bet is to take your vehicle to the dealer or some other ASE certified repair shop !
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