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I'd double check that the wiring didn't get pinched or damaged during the installation. Sounds like it is not getting enough power to the headunit. If the radio display brightens as cut off the dash lighting.
Likely that the new headunit is drawing more power than what the system can provide when the main lamps come on - happens often when there are two similar headunits, but intended for different models or generations. Might be able to wiring in power from another source - but will need to figure out the pinouts on the back of the headunit.
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2002 Corolla S, 1.8L 1ZZ-FE VVT-i
2003 Matrix XRS, 1.8L 2ZZ-GE, VVTL-i (RIP)
2009 Matrix XRS, 2.4L 2AZ-FE VVT-i
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