Case Study
Porsche Cayenne Boot Not Working
Our customer's Porsche Cayenne had been parked for two months, and since then the boot had stopped opening. The latch mechanism could be heard trying to work before stopping. The customer suspected water might have got in but hadn't found any evidence, although they had noticed feedback coming from the speakers whenever it rained. Our Porsche specialist technicians carried out a full diagnostic investigation.
Fault Codes
Terminal 30 – Circuit 1 open circuit
Terminal 30 – Circuit 2 open circuit
Terminal 30 – Circuit 3 open circuit
Common Symptoms
- Boot not opening
- Boot latch heard working, then stopping
- Feedback or droning from the speakers when it rains
- Fault appearing after the car has been parked for a while
Porsche Cayenne Diagnostics
Our first check showed there was no power reaching the boot latch, pointing to a fault with the rear body module or its wiring. A scan of the rear body module found three permanent fault codes for Terminal 30 circuits 1, 2 and 3 open circuit, which wouldn't clear. The fuses were all intact, so we stripped the offside rear quarter panel and the B and C pillar trims to reach the module. Water getting into the rear of the Cayenne and damaging the body module is a known issue on these vehicles. Pin-point wiring checks and a load test confirmed the wiring was fine, so we removed and opened the module and found heavy corrosion on the circuit board. We tried cleaning and retesting it, but the fault remained. We also checked the amplifier and found heavy corrosion on its terminals and plug, but caught it early enough that cleaning the pins and contacts cured the speaker feedback. A water test then traced the leak to blocked panoramic roof drains, which were overflowing into the car.
Vehicles Affected
Porsche Cayenne
- Porsche Cayenne 2002
- Porsche Cayenne 2003
- Porsche Cayenne 2004
- Porsche Cayenne 2005
- Porsche Cayenne 2006
- Porsche Cayenne 2007
- Porsche Cayenne 2008
- Porsche Cayenne 2009
- Porsche Cayenne 2010
- Porsche Cayenne 2011
- Porsche Cayenne 2012
- Porsche Cayenne 2013
- Porsche Cayenne 2014
- Porsche Cayenne 2015
- Porsche Cayenne 2016
- Porsche Cayenne 2017
VW Touareg
- VW Touareg 2002
- VW Touareg 2003
- VW Touareg 2004
- VW Touareg 2005
- VW Touareg 2006
- VW Touareg 2007
- VW Touareg 2008
- VW Touareg 2009
- VW Touareg 2010
- VW Touareg 2011
- VW Touareg 2012
- VW Touareg 2013
- VW Touareg 2014
- VW Touareg 2015
- VW Touareg 2016
- VW Touareg 2017
Audi Q7
- Audi Q7 2006
- Audi Q7 2007
- Audi Q7 2008
- Audi Q7 2009
- Audi Q7 2010
- Audi Q7 2011
- Audi Q7 2012
- Audi Q7 2013
- Audi Q7 2014
- Audi Q7 2015
Drain Unblocking & Body Module Replacement
We unblocked the panoramic roof drains and retested them to make sure there was no chance of the leak returning. With the source of the water fixed, we replaced the corroded rear body module with a new one. This module needs to be programmed and coded to the vehicle, which requires the right diagnostic equipment and isn't something every garage can do.
Resolution
With the new module fitted, we tested the boot and it opened and closed exactly as it should. A water flow test confirmed the drains were clear with no internal leaks. We dried the area around the new module, reassembled the interior and completed the module coding. Our customer's Cayenne left with a fully working boot, clear panoramic roof drains and a sound system free from droning speakers.
Are you experiencing a similar issue?
Book in your vehicle for diagnostics today.
Collection & Delivery
We can collect your vehicle and deliver it back to you.
Hire Cars Available
Stay on the road with our hire cars.
Smooth, Hassle-Free Service
We make the process easy from start to finish.