Question about 2000 Cadillac Seville STS

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I just bought a 2000 Cadillac STS with a 4.6L northstar engine. It will not go into 4th gear, and service electrical, service brakes, service transmission "all the service messages are coming on the display". None of the windows work ether. I plugged my tech 2 to the OBD2 connector under the dash and I have no communication with any of the modules on the car. I thought it might be my tech 2 scanner, so I tried the scanner on another car and it worked just fine. I checked the power and grounds at the OBD2 connector and they are ok. But the data link wire "purple wire" is also showing to be ground. Does anyone have any ideas what could be causing these problems and if the data wire on the OBD2 connector "purple wire" should be grounded?

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The only times I've had no communication problems is when the car's computer has failed.

Posted on Apr 11, 2017

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Posted on Jan 02, 2017

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SOURCE: Cooling fan fault on 1989 Cadillac Seville

I discovered it was the fan control module. I found it on the internet for 150.00 plus 100 core. I googled the part # and thats how i found the company. My local cadillac dealer quoted me 402.

Posted on Apr 13, 2009

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SOURCE: 1999 cadillac sts over charging

on the positive battery cable under back seat is a red device with small orange and bule wires called a thermister controls alt output.this device is no longer availible from gm good news is you can buy a resistor of 1600 ohms from radio shack for lees than a dollar plug it in to connector instead of the thermistor and chargeing goes back to normal. radio, windows ,cruise, control should go back normal also

Posted on Apr 26, 2010

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SOURCE: None of the power windows work ona 1998 Cadillac STS. Checked the breaker under the back seat for continuity it's shows good. The power mirrors work fine and the rear window lock out light come

For all types of power window problem and power windows not working,i suggest you to go through the help links given below. Click the link to go through its procedure to troubleshoot the problem :------

Power window problem
http://repairhelpcenter.blogspot.com/2012/01/pontiac-grand-am-power-window-not.html
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Power windows not working after car wash?http://howtobyme.blogspot.com/2011/11/power-windows-not-working-after-car.html
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power locks, power window and power mirror not working?
http://howtobyme.blogspot.com/2011/09/power-locks-power-window-and-power.html
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All power windows not working?
http://howtobyme.blogspot.com/2011/09/all-power-windows-not-working-on-2003.html
------------
How to remove window motor and regulator on Car?
http://howtobyme.blogspot.com/2011/09/how-to-remove-window-motor-and.html

-------------

Complete Diagnosis & Testing Power Windows?
http://repairhelpcenter.blogspot.in/2012/02/diagnosis-testing-power-windows.html
-----------This will help.Thanks

Posted on Mar 02, 2012

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