Some navigation questions

[N*Caddy]

Well … I had high hopes on this highly specialized stereo place I got the contact information from a GM dealer. Well I called the number asked for the guy I was told and turned out to be an aftermarket stereo installer shop (for Cadillac). I actually was more knowledgeable in the field than the guy I spoke with.
Looks like I am on my own on this…
So again, anybody can tell me the location of a VCM in a 98 and newer STS, my strategy is to add one on the data bus hoping that’s what the NAV unit looks for.

[CadillacSTS2003]

i think the VCM is part of the BCM
ill check ESI right now

[CadillacSTS2003]

wow i was wrong
it is its own seperate module

Remove left sound insulator. Refer to Closeout/Insulator Panel Replacement - Instrument Panel (I/P) Lower in Instrument Panel Gauges and Console.
Remove electrical connector from module.
Move bottom of module (3) towards brake pedal first and then slide down from bracket (2).

[N*Caddy]

Originally Posted by CadillacSTS2003

wow i was wrong
it is its own seperate module

Remove left sound insulator. Refer to Closeout/Insulator Panel Replacement - Instrument Panel (I/P) Lower in Instrument Panel Gauges and Console.
Remove electrical connector from module.
Move bottom of module (3) towards brake pedal first and then slide down from bracket (2).

Do you have a picture/diagram to post for me?

[CadillacSTS2003]

sure thing




info of the specific location according to ESI
PASS-Key® III Theft Deterrent Module
Left hand of the instrument panel, right of the steering column

and heres the pin out for the connector to ensure you have the right one


Pin
Wire Color
Circuit No.
Function

A
ORN
440
Fused Output - Battery

B
YEL
1836
Magnetic Rotation Detection Sensor Signal

C
BLK
1459
Magnetic Rotation Detection Ignition Key Cylinder Sensor Feed - 12 Volt Reference

D
PPL
1807
Class 2 Serial Data Line

E
PPL
1807
Class 2 Serial Data Line

F
WHT
1390
Ignition Switch Output - Off/Run/Crank

G
YEL/BLK
625
Starter Enable Control

H
BLK/WHT
451
Ground

J
WHT
1835
Magnetic Rotation Detection Sensor Signal

K
--
--
Not Used

[N*Caddy]

Some how just by looking to the pin description this VCM does not seem to be it so I am starting with the RIM (the most logical unit). I just borrowed today one ’98 STS RIM from Jake to do the tests. Well I actually tested the NAV unit in one of so many Cadillac he has and connected just to the data port (same way I am testing in my car) fired right up, I got to see for the first time in my life live the NAV unit blue screen with the Cadillac crest in the background. I loaded the firmware and did not beeped (again strange...same like last time in my car) then no image – so far like in my car. Turned the ignition ON and BAM! in 1 second I had the image in the screen. Is funny how with both the original HU and the NAV unit connected to the car bus I was able to control the volume from either one, is actually amusing. But sadly so far in my car still no worky. So in the Adam Savage (Myth Busters) spirit I would say with the ’98 RIM I got 20% chances to turn the NAV unit ON (YAHOOO!), 79% chances no change, 1% chances something that I can not imagine will happen.
Let’s see…

[N*Caddy]

Nope the RIM made no difference…
Back to the VCM, I kind of see what is the problem, if I turn the ignition on it does not receive all the data requested. Say now I realize that all vehicles with NAV have Pass Key III. Can anybody give me more details about this VCM?
What is the VCM function?
What is the Magnetic Rotation Detection Sensor Signal?
Where are these 1459 and 1835 circuits connected?

[N*Caddy]

Still working on it…
So back to the VCM, I am unable to locate the darm thing in the car, based on the diagram J posted suppose to be on the center-left side of the dashboard (or at least that’s what I can see in the diagram).
Anybody knows exactly where the module is and how to get to it?
Also I need the full electrical diagram of the PassKeyIII circuit witch I assume incorporates the VCM as a central module. Is not like I am planing to get into the “free to me Cadillac business” I am just trying to get this darm NAV unit working.