Rear window defogger inop after BCM swap
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Junior Member
Joined: Dec 2024
Posts: 29
From: Upstate NY
Nope. I figure it would just made it harder if I ever need to open it up again. What I did do is mummify the BCM in about a yard of Saran wrap. And more importantly I cleaned out the passenger side sunroof drain and drilled out that stupid grommet like all the Youtube videos show. (Can't even find the driver's side drain). And I'm keeping it in the garage now.
Super Moderator
Joined: Jul 2007
Posts: 13,110
From: Boat Town USA MI
A Battery disconnect is not going to reset any H3/H3T BCM, it will cause them to reboot, which might clear a glitch.
If you are just getting an occasional air bag fault light, you can clear the BCM by placing the vehicle in Neutral, engine running, put one foot on the brake and hold it there, push the Emergency brake on with the other foot and release it, repeat the E brake and release 5 times fairly quickly.
If you are just getting an occasional air bag fault light, you can clear the BCM by placing the vehicle in Neutral, engine running, put one foot on the brake and hold it there, push the Emergency brake on with the other foot and release it, repeat the E brake and release 5 times fairly quickly.
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Junior Member
Joined: Dec 2024
Posts: 29
From: Upstate NY
Your cloned BCM likely isn’t fully configured or hasn’t completed all necessary resets. Check the fuses and relays for the rear defogger and backup lights, ensure the BCM is properly programmed for your H3T’s options, perform a battery disconnect to reset the BCM, and verify all grounds and wiring near the BCM. Once fully configured and reset, those outputs should work.
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