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Discussion Starter · #1 ·
2 months ago all instrument lights and heater and radio lights went out. thought it was a bad dimmer switch, changed that out and no help. Then thought about the BCM but thought I should be getting a few more "symptoms" of a bad BCM. Odometer and shifter lights are fine, mirrors are fine, all interior lights are fine. Soooo. thought about bypassing the BCM altogether and wiring directly to the dimmer switch. having trouble making sense of the wiring diagram for the BCM. is this even possible? 1999 Dodge grand caravan 3.3 thanks
 

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nah i would think its impossible. none of the instruments read directly from the dimmer switch. they rely on the communications bus for messages from the bcm to turn the backlighting on. with the exception of the radio and maybe the HVAC controls get their backlighting directly from the instrument cluster. but the dimmer is only sending a small signal to the BCM. and trying to run dash lights directly from it would cause more damage than good.

do your park lights work?
 

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Thanks, that's helpful. yes park lights work...everything else works except the lights in the front cluster and heater and radio controls...has me questioning the BCM....possibly that i had a defective dimmer switch? (I mean the replacement one?) Would love to know how to check the BCM before dropping $$$ to replace it to find out that's not the problem.... thanks
 

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My wife claims that the parking lights WERE making a cracking noise and flickering for a few weeks. She said it sounded like a short under the drivers side panel where the fuse box is....???? Now the noise is gone, lights seem to work...I'm baffled
 
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