Assuming the information you provided is correct this http://www.modifiedlife.com/2003-cadillac-cts-car-audio-wiring-chart/ should help you
good luck and thank you
https://www.6ya.com/mr.mike
SOURCE: 03 cadillac cts timing belt change procedure
if you know you can do this with directions and go to alldatadiy.com and buy a subscription, you will be glad you do, it is beyond the scope of this forum to tell you. But for 20.00 you will have exact precedures, step by step, and lots more on your car, It's worth it, I promise, If I have not helped you, please do not rate me, If I have please vote fixya. It's the only way you can pay be back for free. God Bless Good Luck, and Merry Christmas!
SOURCE: T/C light comes on in the dash of my 03 Cadillac CTS
T/C would be traction control i would think
Robert
SOURCE: stock stereo wiring diagram for 2003 cadillac cts
there are 2 diagrams listed, one is correct, match the listed wire colors to your car to choose the correct one.
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Car Radio Battery Constant 12v+ Wire: Pink
Car Radio Accessory Switched 12v+ Wire: Blue
Car Radio Ground Wire: Gray
Car Radio Illumination Wire: Red/Blue
Car Stereo Dimmer Wire: Red/Yellow
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: 6 1/2′
Car Audio Front Speakers Location: Doors
Left Front Speaker Positive Wire (+): Pink
Left Front Speaker Negative Wire (-): Blue
Right Front Speaker Positive Wire (+): White
Right Front Speaker Negative Wire (-): Black
Car Audio Rear Speakers Size: 6′ x 9′
Car Audio Rear Speakers Location: Side Panels
Left Rear Speaker Positive Wire (+): Light Green
Left Rear Speaker Negative Wire (-): Purple
Right Rear Speaker Positive Wire (+): Blue
Right Rear Speaker Negative Wire (-): Pink
2.
Car Radio Battery Constant 12v+ Wire: Yellow
Car Radio Accessory Switched 12v+ Wire: Green/Black
Car Radio Ground Wire: Chassis
Car Radio Illumination Wire: Red
Car Stereo Dimmer Wire: Gray
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amp Trigger Wire: Green/White
Car Stereo Amplifier Location: Under the Passenger Front Seat.
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): White
Left Front Speaker Negative Wire (-): Black
Right Front Speaker Positive Wire (+): Yellow
Right Front Speaker Negative Wire (-): Brown
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Black/Red
Right Rear Speaker Positive Wire (+): Blue
Right Rear Speaker Negative Wire (-): Black/White
SOURCE: The AM/FM radio in my 2003 cadillac CTS faded to only static
check antenna cable connections at radio & antenna.suspect power antenna if equipped.
SOURCE: where is the thermostat on an 03 cadillac cts
no the thermostat is not always in the upper radiator hose
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