1989, No crank, VATS/PASSKEY problem and workaround
Subtitle: How to completely bypass VATS and PASSKEY for $20.
I've already implemented the workaround, and I'm posting this as a reference for the internet, because I searched and could not find my very specific problem set, with a proper explanation and the workaround fully documented. My hat's off to the guy at https://vatssucks.wordpress.com/, but with all due respect, he stops short of the real bypass and only recommends an ECM reprogram. There is a much cheaper, quicker, and easier way... 1989 Convertible L98 w/electronic door locks Symptoms
Troubleshooting According to the FSM, when the ign key is turned to ON, the security indicator lamp should go solid for two seconds before going out. This was not happening. It would do its normal blinking/solid/off routine for the arming/disarming of the anti-tamper alarm that is governed by door locks and hood/hatch releases, etc. But as soon as the ign key was turned to ON, the light went out. When turned to Start, instead of the engine cranking, the security light blinks. This was the behavior that I searched for, and while I found one or two other reports of this, I didn't see any resolutions. I'm not saying no one answered the question, just that I couldn't find it, and hence, this write-up. The FSM instructs to do the "Security Indicator Voltage Test" (8A-133-14), which is testing for battery voltage in the dark green (#4) wire, and if it's present (it was), then it stops here and says replace the PASSKEY module. I took the PASSKEY module out of it's little plastic house and really looked for any visual signs of problems, and there were none. I'm used to seeing problems with PCBs and have found and fixed a lot of them, e.g. cold solder joints in the electronic dash and climate control modules, burned resistors, leaky caps, etc. The two major online parts suppliers that I use both sell this thing for about $350, but neither have it in stock. Note: jumping the VATS starter relay does allow the engine to crank with the key, but it won't start (because the fuel injectors are not operating, because the ECU is not seeing OK signal from PASSKEY). Workaround I don't call it a "fix" because it doesn't fix anything. But it will completely bypass and disable VATS, at least as it relates to ign key stuff.
GM VATS PASSKEY Bypass, ~$20 on Amazon https://cimg8.ibsrv.net/gimg/www.cor...0b34e3d584.jpg Behind the breadbox, PASSKEY and starter relay bypassed |
A question. I bought this awhile ago but haven't installed it yet due to other projects in the way for now. You unplug and leave unplugged the connector for the
PASSKEY module? Then you connect the wiring as per the instructions? Just want to pin it down. I also have the resistor that will match my key so I'll install that as well (belt & suspenders kind of guy). |
Originally Posted by RalfKramden
(Post 1599735331)
A question. I bought this awhile ago but haven't installed it yet due to other projects in the way for now. You unplug and leave unplugged the connector for the
PASSKEY module? Then you connect the wiring as per the instructions? Just want to pin it down. I also have the resistor that will match my key so I'll install that as well (belt & suspenders kind of guy). |
Originally Posted by Scott Garner
(Post 1599736300)
That’s right. Leave PASSKEY module unplugged after you install the bypass. If you think of it, do this part first, then disconnect the wires that read the resistor off the key, and see if it all works.. I’m curious about that.
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Originally Posted by Scott Garner
(Post 1599736300)
That’s right. Leave PASSKEY module unplugged after you install the bypass. If you think of it, do this part first, then disconnect the wires that read the resistor off the key, and see if it all works.. I’m curious about that.
Tim |
I love this thread.
I too would love the bypass AKA replace the VATS module but haven't found on that lists it will work with a 1986 model year. Does anyone have an idea where I could buy one? Thanks, Doc |
Originally Posted by RalfKramden
(Post 1599875494)
Ok Scott, just installed the bypass and left the pellet wires uplugged and the car started no problem. So if you install this, the resistor bypass is not necessary
Tim |
Originally Posted by Doctorbatman
(Post 1599916686)
I love this thread.
I too would love the bypass AKA replace the VATS module but haven't found on that lists it will work with a 1986 model year. Does anyone have an idea where I could buy one? Thanks, Doc |
Fantastico
Scott gets a big thumbs up for his detailed description of his successful VATS disabling process. Another thumbs up is in order for providing similar supporting info on Amazon. Great job Scott!
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