’03 Caddy CTS Passkey III Plus

Printed From: the12volt.com
Forum Name: Car Security and Convenience
Forum Discription: Car Alarms, Keyless Entries, Remote Starters, Immobilizer Bypasses, Sensors, Door Locks, Window Modules, Heated Mirrors, Heated Seats, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=43360
Printed Date: July 23, 2025 at 4:42 AM

Topic: ’03 Caddy CTS Passkey III Plus

Posted By: hotttunes
Subject: ’03 Caddy CTS Passkey III Plus
Date Posted: November 19, 2004 at 8:37 PM

Anyone know anything about this? It is VVERY DIFFERENT from PASSLOCK III Plus and most others as it seems to CHANGE resistance/codes. Made by DELPHI and complete unit will unplug. Any permenant bypass known???

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Hotttunes - Bassman
Installer since 1976
Too many years experience
Cookeville, TN.

Professionally Installed With Pride

Anything worth doing is worth doing to the BEST of your ability!

Replies:

Posted By: mo12v
Date Posted: November 19, 2004 at 8:49 PM

Not aware of anything different than:
GM Passkey 3 Transponder Immobilizer Overrride & GM Passlock 2 Immobilizer Override via data bus

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MO

Don't Learn from Others Mistakes
You Might Be the One That Knows.

Posted By: NowYaKnow
Date Posted: November 19, 2004 at 9:09 PM

From what I'm showing the Cadillac CTS uses PassKey III which can be bypassed with a PKG 4, PKG 5, or a GMBP bypass. The passkey wires should be violet (2), orange, black, and pink. Are these what your showing or something different?

Mike

Posted By: hotttunes
Date Posted: November 19, 2004 at 9:46 PM

Yes they are but DEI didn't show it needed anything but a 555U or I would have had a 456G and a 555G on standby. I usually do my own WRAP the Key and use a relay but the Transponder in this unit is Quite different. It CHANGES Code and resistance ever so often. What I am looking for is a way to bypass the DELPHI transponder unit (like where it plugs in) for an emergency (Damn I don't have a correct bypass module in stock and already have the car here) bypass. I hate it when sales doesn't check the charts for the needed bypass (in this case the WRONG bypass was listed anyhow) and we have to take the blame posted_image

(SALES: "Oh the installer didn't have the right module for your vehicle in stock."). I don't like to permenantly bypass the KEY SECURITY but it has been done a lot. posted_image

I worked for C & A Controls for 8 years (They built LAZY START and others for several brands) and gained a lot of experience in Southern Engineering "Field Fixes". This one is a little more difficult with all of the DATA interfaces.

Posted By: jrilla
Date Posted: November 19, 2004 at 10:55 PM

Making your own will work fine. I mean a the universal type bypasses are no different than what you do when you use the key. I mean you are using a key and then you just transmit the signal from under the dash to the cylinder.

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J Rilla

Owner/Installer