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Hi there,

I am having some technical issues with my Cayenne, and I suspect that the computer is either not supplying power to a control unit, or that there is a break, loose connection, or short somewhere for the power running to the control unit in question. To troubleshoot this, I want to check and see if the control unit in question is getting power at all. I am after the module that controls the following:

- brake proportioning

- air suspension

- PSM

Hopefully they are all in one location, although I would suspect that if the first two were unavailable, the PSM function would go off by default too.

If you can tell me the location, I would greatly appreciate it.

Thanks, Mark

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Hi there,

I am having some technical issues with my Cayenne, and I suspect that the computer is either not supplying power to a control unit, or that there is a break, loose connection, or short somewhere for the power running to the control unit in question. To troubleshoot this, I want to check and see if the control unit in question is getting power at all. I am after the module that controls the following:

- brake proportioning

- air suspension

- PSM

Hopefully they are all in one location, although I would suspect that if the first two were unavailable, the PSM function would go off by default too.

If you can tell me the location, I would greatly appreciate it.

Thanks, Mark

Can't remember where it is now, but google the cayenne parts manual, its a free pdf from porsche's site, usually you can kind figure out where things are from that.

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Great tip - thanks!

Mark

Brake proportioning is inside the PSM control unit, which is located under the cowl on the passengerside. You will also need to remove the DME in order to get to it. The Air suspension control unit is in the passenger rear luggage compartment, behind the access panel.

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To confirm: passenger side? I thought that the only major electrical junction under the cowl was driver side. Finally, "remove the DME" - I do not know what you mean, but I assume you are referring to the fuse box that is at that location (that the PSM unit is beneath that).

Thanks,

Mark

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To confirm: passenger side? I thought that the only major electrical junction under the cowl was driver side. Finally, "remove the DME" - I do not know what you mean, but I assume you are referring to the fuse box that is at that location (that the PSM unit is beneath that).

Thanks,

Mark

Yes the DME and PSM control unit are on teh passenger side. If you lift up the cowl on that side you will first see the DME. If you remove this you will see the PSM control unit underneath. The PSM control unit is integral with the ABS hydraulic unit. This is all assuming you have a LHD car...

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  • 1 month later...

Thanks, I inspected the connection to the PSM control unit, which was right where you described. In the end I found the solution to my electrical problems, which I have detailed and documented as part of another post: http://www.renntech.org/forums/index.php?showtopic=30560

Thanks for your help with this one.

Mark

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