A few days ago, the power trunk on a 2016 Volkswagen Tiguan began malfunctioning. Pressing the soft-touch switch in the hatch releases the lock, and the trunk begins to open but stops prematurely. Repeatedly pressing and holding the switch results in the trunk opening incrementally until fully open. However, the power closing feature is completely unresponsive, requiring manual closure. While the owner’s manual states that manual closure is permissible, it seems potentially damaging to the power mechanism.
TrunkLidButtons.jpg
The image above shows the interior trunk release buttons. The left button, typically used for automatic closure, is unresponsive, and the LED in the right-side switch, which usually illuminates when the hatch is open, remains off.
Diagnosing the Fault with VCDS
A VCDS scan was performed to identify any fault codes within the 6D-Trunk Elect module or the BCM (Body Control Module). Surprisingly, no relevant fault codes were found in either module. The complete Auto-Scan results are provided below.
Auto-Scan Results and Potential Causes
The comprehensive VCDS Auto-Scan reveals no errors in the 6D-Trunk Elect module, ruling out common issues like faulty wiring or a malfunctioning motor. However, the lack of illumination in the interior trunk release switch LED suggests a potential problem with the switch itself or its associated wiring. Furthermore, the unresponsiveness of both interior buttons points towards a possible control module communication error or a faulty control unit in the trunk lid.
It’s important to note that several fault codes are present in other modules, unrelated to the trunk issue. These include:
- 01-Engine: Voltage Supply 1 for Control Module too low.
- 13-Auto Dist. Reg: Multiple faults related to the Automatic Distance Control sensor, likely due to limited visibility.
- 5F-Information Electr.: Tuner for Satellite Radio deactivated.
While these codes don’t directly impact the trunk functionality, they highlight the importance of a thorough diagnostic scan.
Next Steps and Seeking Professional Assistance
Since the vehicle is still under warranty, the recommended course of action is to have the dealership address the issue. They possess the necessary diagnostic tools and expertise to pinpoint the problem and perform the required repairs.
However, some potential DIY solutions could be explored before visiting the dealership:
- Check Fuses: Inspect the fuses related to the trunk release system. A blown fuse could be the culprit.
- Inspect Wiring: Visually examine the wiring harness connected to the trunk release switch and the actuator motor for any signs of damage or disconnection.
- Test the Switch: Use a multimeter to test the functionality of the trunk release switch.
VCDS Auto-Scan Code: Full Report
(Full VCDS Auto-Scan code as provided in the original post)The provided VCDS Auto-Scan is a valuable resource for experienced technicians. While it didn’t reveal specific trunk-related errors, a deeper analysis of the data, combined with further diagnostic testing, might uncover the root cause of the problem. For those unfamiliar with VCDS, seeking professional help is advised. This will ensure proper diagnosis and repair of the power trunk issue without risking further damage.
