What are the reasons for the trunk light not working in an Audi C6?
3 Answers
The reasons for the trunk light not working in an Audi C6 may include a burnt-out bulb, poor contact, or wiring issues. Burnt-out bulb: Open the trunk, and near the left side close to the taillight, carefully pry out the lamp holder using a screwdriver from one end. At this point, you can see the bulb and attempt to replace it with a new one. Location of the trunk light: The trunk light switch is integrated with the trunk switch, essentially functioning as a sensor. For ease of operation, the trunk light is usually positioned near the latch area of the trunk door. When the door is closed, it triggers the sensor, causing the trunk light to turn off.
Recently encountered a situation where the trunk light of an Audi C6 isn't working. I think we need to consider three aspects. The most straightforward possibility is a burnt-out bulb, failed LED chips, or poor contact due to a loose socket. With frequent trunk opening/closing, the lamp's metal contacts are prone to wear. Secondly, wiring issues are common in C6 models over a decade old, especially the wiring harness near the trunk hinge area which frequently bends, leading to short circuits or broken wires. Last time I found cracked wire insulation causing grounding faults. Then there's the fuse issue – check fuse #27 (15A) in the second box on the driver's side. A loose trunk switch spring might also affect signal transmission. Using a diagnostic tool to read fault codes would be most accurate.
When the trunk light of my C6 suddenly stopped working, I prioritized checking three areas. First, after opening the trunk cover, I checked if the bulb had turned black—these LED bulbs typically last about 5 years, and oxidation on the contacts can cause poor connectivity. Next, I inspected the fuse box located near the driver's left foot area, identifying the 10A fuse labeled for the trunk light, and used needle-nose pliers to remove and check if the fuse was blown. Finally, I traced the wiring harness along the left side of the trunk, paying close attention to any exposed wires near the hinges or loose connectors that might have gotten wet. Also, the sensor switch for trunk closure should be checked, as the spring mechanism can easily get stuck. If none of these checks resolve the issue, it’s necessary to examine the signal output from the BCM control module, preferably using a 5054 diagnostic tool at a repair shop to read the fault codes.
