What causes the dash lights to blink when you turn on signals a 1999 Chevy Malibu?

The dash lights blink when you turn on the signals in a 1999 Chevy Malibu because of a faulty turn signal switch. The turn signal switch is a component of the vehicle's electrical system that is responsible for controlling the turn signals. When the switch is faulty, it can cause the dash lights to blink when the turn signals are activated. This can be a dangerous problem because it can distract the driver and make it difficult to see the road. If you notice that your dash lights are blinking when you turn on the signals, you should have the turn signal switch replaced as soon as possible.