One of the modules may be doing it , interior light lit -glove box ! Hard to say on newer vehicles , after 1996 ! You vehicle has some of these modules if not all !
The class 2 serial data line on this vehicle is a star configuration. The following modules communicate on the class 2 serial data line:
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The body control module (BCM)
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The digital radio reciever
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The driver door module (DDM)
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The electronic brake control module (EBCM)
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The front passenger door module (FPDM)
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The HVAC control module
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The inflatable restraint sensing and diagnostic module (SDM)
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The instrument panel cluster (IPC)
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The memory seat module (MSM)
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The powertrain control module (PCM)
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The radio
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The radio amplifier
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The rear seat audio (RSA) controller
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The rear seat entertainment (RSE) assembly w/U42
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The rear wheel steering control module
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The remote playback device-CD player w/U1S
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The transfer case shift control module
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The transmission control module (TCM) w/Allison Transmission
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The theft deterrent control module
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The vehicle communication interface module (VCIM) w/UE1
The way to find the drain on the battery is to do a Parasitic Draw Test ! I'll send a link for Eric the car guy !
How To Perform Parasitic Draw Test EricTheCarGuy
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