What are pins A16 and A20 in Guide 59001?

Question

I'm looking at Guide 59001, which is the T-Harness installation for GMC vechicles. I see pin A16 (Purple/Yellow) and A20 (Light Blue) are connected, but not labeled. What are these? I ask because the guide without the T-Harness, Guide 59041 shows those pins not connected. Any chance one of them is Accessory? I ask because I need to connect to the Accessory wire, but am using the T-Harness.

Answer 1

It used to be needed in the older solutions when we needed to power up ACC, but has been disabled as outputs now,

 

May I ask why you need Accessory to be powered up during remote start? Because powering it up with the wrong timing will cause the evo to not be able to remote start anymore.

Thank you,

Comments

Thanks for the reply. I know that there is no starter circuit on newer GM ignitions, so you need to turn on ACC, then Ignition on, then turn off ACC while keeping Ingition on, which tells the BCM to start/crank the engine.

How do you accomplish the start with these ouputs disabled?

I need ACC because I'm using an AdvancedKeys push-to-start module instead of a remote starter. One of it's options is to turn on just ACC. Which of these pins should I tie into for ACC? I understand I might not be able to go to ACC and then start the car even thought Directed's DBALL2 allows you to, but I prefer giving up the ACC->Start sequence (which would be a rare case) and using Fortin products instead. Or perhaps I can use a relay to turn off the ACC when the starter output goes high.

Thanks for any pointers!

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Yeah, we get a lot of these issues with people installing the advancekeys systems, these systems are easy to connect to probably a 1999 honda civic, but on newer vehicles especially your type of vehicle.not so easy.

 

One thing you can try is to disconnect the light blue and purple/yellow from the 20 pin connector and test these wires with a voltmeter and see which one is the true ACC wire, you can try powering this wire up with the advancekeys ACC output wire, but like I said, i cannot guarantee that doing this will not mess up the timings and prevent remote starting.

 

Thank you,

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Ah, ok. I will test both to see which one goes to ACC. Should I leave them both disconnected from the EVO-ALL, or should I connect them? If connecting them, powering the ACC from the advancedkeys unit won't hurt the EVO-ALL (i.e. short it), since the output and input is disabled, correct? Thanks!

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keep them disconnected from the evo all, and just connect the ACC wire to the advancekeys and test, like I said, our units were not designed with the advancekeys systems in mind and that our units are only designed to stay on for 15 minutes at a time during remote start runtime.

 

Thank you,

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Ok, sounds good. The 15 minute shouldn't matter, since I'm not using it in stand-alone mode, correct? Then it's up to the advancedkeys unit to decide when it shuts off.

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Please call Advancekeys concering your steering lock bypass, since you really cannot leave a cut key in the ignition barrel on GM vehicles because leaving a key in will keep voltage on the v-data wire signaling "key in ignition barrel" and might keep the vehicle's bcm from going into "sleep mode"

we have reached the limits of knowledge on the advancekeys systems.

Thank you,

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Oh, I'm not leaving a cut key in there because GM doesn't put steering wheel locks in later model trucks anymore, so it's not an issue. Thanks again!