Check connections and alignment of the neutral safety switch, located under the dash on the steering column. That switch is what controls the reverse lights. To check operation: With the car engine *off*, have a friend stand so he can see the rear lights, and run the gear selector thru it's full range of motion, chances are the rev. lights will come on, probably when it's in neutral.
have you checked the bulbs and fuses
check bulbs, fuses & reverse switch
you could have possibly bought the wrong bulbs and/or fuses. or when you were replacing them you may have damaged the wires. Also the reverse light switch may be defective.
There are a couple of reasons why a 2005 Saturn Ion's reverse lights will not work. The fuses may be blown or the light bulbs need to be replaced. Fuses and bulbs can be purchased at any auto parts store.
The 2002 Cavalier has a reverse light switch. The switch can be bad, or have a loose connection causing the lights not to work.
98 sierra1500 4x4 all lights work excepttail lights fuses are good bulbs are new
Check the fuses first then check the bulbs.
have you checked the reverse lights switch?
Defective reverse light switch.
There is a switch on the shifter or trans that turns on the lights when the vehicle is placed in reverse, it is out of adjustment or faulty. And don't forget the bulbs or fuses as a cause.
check your bulbs and fuses check your bulbs and fuses
did you check the reverse switch on the trans ?