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Bypassing 9C1 Ignition controlled trunk release

 
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05Impala9C1
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PostPosted: Mon Jan 04, 2010 9:26 pm    Post subject: Question Bypassing 9C1 Ignition controlled trunk release Reply with quote

I'm not going to ask if it's possible because I'm sure it is.

The Situation: My 9C1 has the Ignition Controlled Trunk Release, so it it only works when the car is on.

What I want to happen: I'd like to re-wire the switch to function at all times so that I don't have to open the trunk with the key or turn the car on to use the in car release.

What I need: Anyone who knows how to do this in the most efficient way. I'm new to the Impala so I just need to be pointed in the general direction of a hot all the time wire I can tap into or if there's a better way to go about doing this (please don't tell me this BCM I keep hearing about needs to be re-programmed...well if so it would be handy to know but hopefully.)

Come to think of it, if there's a wire that's hot except while in gear that about be good so I can't pop the trunk while driving down the road, unless there's already a separate safety feature in place.

Thanks
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bbengineer
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PostPosted: Tue Jan 05, 2010 12:47 am    Post subject:   Reply with quote

If you don't want to have the BCM reprogrammed (not sure if this is even an option that can be changed without replacing the BCM), then it's non-trivial

You would have to add a relay to drive the trunk release off the factory button, or completely rewire the button (it currently grounds a pin on the BCM which in turn provides power to another pin on the BCM which is connected to the trunk release motor)

There is no 'hot while in gear wire' either... the BCM knows you are in gear by asking the PCM and if you are in gear, the BCM prevents the trunk release

BBEngineer

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Frank
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PostPosted: Tue Jan 05, 2010 1:34 am    Post subject:   Reply with quote

It's an option that is configurable in the BCM...the good news is that you don't need a new BCM, but the bad news is that you will still have to make a trip to the dealer to have it changed to function normally.

It's one of the few options in the BCM that can be changed at any time without requiring a new BCM.

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05Impala9C1
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PostPosted: Tue Jan 05, 2010 12:52 pm    Post subject:   Reply with quote

Thanks for the good info, we'll have to see what the dealer wants to reprogram the BCM - if it's not to much then cool, otherwise I'll learn to live with it.
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