There are a couple of issues with cleaning cd's. The brush won't scratch the lens very often, but it will loose the fibers inside of the unit. These get lodged inot the cd and drive mechanism. The most common issue is how it loads. A indash unit loads by griping the side of the cd. A cleaning won't load correctly and either becomes lodged or can strike the lazer as it passes. If the car is a 2003 the HU may still be under warranty. We manufacture OEM HU's for Toyota and GM. Most of the units are covered under the manufacturer for a extended tilme past the GM three year warranty. The GM units are new to our plant, but the Toyotas carry a five year warranty through Fujitsu Ten. If it is not under warranty then list the issues the HU is having. The most common issue is damage due to a misloaded cd. Many problems will show up as a error code on the unit.
double0alero, please be aware that most GM Hu's cannot be placed into another vehicle. If the car is equiped with a CAN system (most aleros are) then the HU is given a serial number from the network. If the serial number does not match it will not power up. I am uncertain as to what year that they started placing the security into the HU, but I can verify that all 2003 and ups do. Even if your HU did not have this feature, the owners 2003 alero network will. The only option that either of you will have is to find a dealer that can flash the unit. With your permission, most will send it out but very few can do it in house. The HU uses a serial stream that requires a flashing computer and dedicated software that is extremely expensive.
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2003 Maroon Alero GLS Sedan. (Purchased new in 2003 with 18 miles, and sold in 2006)
2004 Toyota Corolla LE (Purchased new in 2003 with 87 original miles)
2007 Toyota Camry LE (12 original miles)
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