Auto Electronics: 2005 chevy malibu, turn signal switch, 2005 chevy malibu

Question
Hi. The left rear turn signal and brake light are out. The parking lamp works however. The front is fine except the turn signal flashes rather fast compared to before the rears went out.Thanks for any help

Answer
Hello Alex, I don't see in your post that you have checked the bulbs. This would be the first thing to check and make sure that the bulbs are all the correct type and number. An incorrect bulb can cause all kinds of problems. These newer systems use the Body Control Module (BCM) to control the lighting systems. The turn signal switch feeds its signal to the BCM and from that point on, the lights are controlled by the BCM. Any change in circuit resistance from an incorrect light bulb or circuit malfunction, can cause the BCM to malfunction. If correct bulb replacement doesn't fix it, voltage drop tests and a system scan are the next steps in the troubleshooting process. For best results the BCM will need to be scanned with the factory Tech 2 scan tool. Don.