Replacing a faulty door control unit in a Porsche Boxster can be a complex process. This article outlines the steps involved in replacing the alarm siren and tilt sensor, focusing on wiring, sourcing parts, and the potential need for recoding the rear control unit.
The wiring for both the alarm siren and tilt sensor is relatively straightforward, involving only a few wires. Sourcing the correct gauge and color wires from an automotive electrical supplier is recommended. However, finding replacement plugs can be challenging. Porsche doesn’t officially sell them. Fortunately, the alarm siren is a shared part with certain VW models, including the Touareg. Further research revealed that the tilt sensor is also the same unit used in the Touareg and Cayenne, due to the joint venture between VW and Porsche. This allows for purchasing replacement plugs and repair pins directly from VW, enabling a custom wiring harness to be created.
While the siren and sensor can be sourced from UK dealers or car breakers, compatibility needs to be considered. In this specific case, the units were obtained from a breaker. The new wiring harness is in place, requiring connection to power, ground, and the rear control unit (CU).
A crucial step is determining whether the rear CU requires recoding. While it’s uncertain if it’s absolutely necessary, there’s a strong possibility that the siren and tilt sensor need software activation. The tilt sensor itself is a complex device with multiple pin outs, suggesting advanced functionalities that might require proper configuration.
The car in question was imported from Germany to the UK. Recoding the rear CU to UK/Netherlands specifications shouldn’t be an issue. However, if the original vehicle was coded for the USA/Canada, recoding for different regions might affect other functionalities. This poses a potential problem for US-based owners. Consultation with a local independent specialist familiar with Autel diagnostic tools and Porsche recoding procedures is recommended. They can determine if the Autel door control unit is indeed faulty and assist with the necessary recoding process.
Further updates will be provided as the repair progresses. This information is intended for experienced DIY enthusiasts and should not be attempted without proper knowledge and tools. Always consult a qualified technician for complex repairs.
