2003 Pontiac Grand Am | Stereo Wiring Diagram 2003 Pontiac Grand Am. April 11th, 2012 Posted in Pontiac Grand Am. Left Rear Speaker Positive Wire (+): Brown Left Rear Speaker Negative Wire (-): Yellow The stereo wiring diagram listed above is provided “as is” without any kind of warranty. Use of the information above is at your own risk. 2003 Pontiac Grand Am Car Stereo Wiring Diagram Whether your an expert Pontiac Grand Am mobile electronics installer, Pontiac Grand Am fanatic, or a novice Pontiac Grand Am enthusiast with a 2003 Pontiac Grand Am, a car stereo wiring diagram can save yourself a lot of time. Automotive wiring in a 2003 Pontiac Grand Am vehicles are becoming increasing more difficult to identify due to the installation of more advanced factory oem electronics.
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