Hummer H3- all keys lost.. remote start/bypass help.
Senior Member
Joined: Jul 2012
Posts: 9,024
From: C-Town
this is getting really confusing now... so, I found a photo of a cylinder casing for a h3 and it shows three wires leading to a hall sensor in the casing.. i understand the logic, the magnet alters the resistance which changes the voltage going down the reference wire to the bcm.. only problem with mine is.. it doesn't have any wires going to a hall sensor.. it has a live and ground going to the key retention solenoid and all other wires come from the switch.. anyone able to shed some light on this? I know I must seem a little thick but Im just doing my best to learn as i go...
Super Moderator
Joined: Jul 2007
Posts: 13,105
From: Boat Town USA MI
thanks buddy... i dont know if my programmer will do anything on this system ( its an Autel 508s ) but certainly worth a go...
I have oredered a remote start, that might provide a solution.. im back there on thursday so i will check all the wires coming out of the switch to see if the match up to what a passlock 2 wiring should be ie 5v reference etc..
I have oredered a remote start, that might provide a solution.. im back there on thursday so i will check all the wires coming out of the switch to see if the match up to what a passlock 2 wiring should be ie 5v reference etc..
Super Moderator
Joined: Jul 2007
Posts: 13,105
From: Boat Town USA MI
You have been overthinking this. The switch is what passlock looks to to deny a start, not a key or super secret hidden magnet hall sensor or resistor.
It was simple, but you complicated it be throwing away your old ignition switch. That might have started it. Now it is like you had a complete ignition switch failure and you need to program in your new one. The other option might be a passlock deleat, which also takes programming.
Good luck and keep after it.
It was simple, but you complicated it be throwing away your old ignition switch. That might have started it. Now it is like you had a complete ignition switch failure and you need to program in your new one. The other option might be a passlock deleat, which also takes programming.
Good luck and keep after it.
Super Moderator
Joined: Jul 2007
Posts: 13,105
From: Boat Town USA MI
Follow the ignition switch reprogramming using the vehicle, step for step, no shortcuts, and CHARGE THE BATTERY COMPLETELY BEFORE YOU DO! You car battery must be fully charged or it will NOT work.
Thread Starter
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Junior Member
Joined: Sep 2025
Posts: 12
From: london
thank you so much for all your help and advice, it really helped.. and everyone else as well. so i went back to it with a clear head, put all the wires back together and started from scratch.. having taken on board whet you said about no resistor etc i decided i was going to give the relearn procedure another go.
I started out with completely the wrong idea and rushed in like a bull in a china shop ( this is standard practice for me )
I put a brand new battery on and also put another new battery next to it and connected them up with jump leads...
tried the relearn to the letter. didn't start..
then i remember id seen a tube video where the guy actually cranked it over once at the start of every cycle... thought " nothing to lose " so, gave it a go... f**k me, it started on the button
I AM NOW EVEN MORE IN LOVE WITH IT..
Hummer H3
2006
just over 8000 miles ( genuine ) on the clock..
been stored in an underground garage for years..
awesome
I started out with completely the wrong idea and rushed in like a bull in a china shop ( this is standard practice for me )
I put a brand new battery on and also put another new battery next to it and connected them up with jump leads...
tried the relearn to the letter. didn't start..
then i remember id seen a tube video where the guy actually cranked it over once at the start of every cycle... thought " nothing to lose " so, gave it a go... f**k me, it started on the button
I AM NOW EVEN MORE IN LOVE WITH IT..
Hummer H3
2006
just over 8000 miles ( genuine ) on the clock..
been stored in an underground garage for years..
awesome