Speed Sensor Wire

[PaulW]

Hi Folks,

Picked up my new S on Thursday and the Alpine navigation system is going in next week (in the single DIN dash opening). I need to locate the speed sensor wire to complete the install (well the installer needs this info). Anyone know where that wire is?

Thanks,

Paul

[Toby Pennycuff]

According to the Service Information Technik manual for the Cayenne S and Cayenne Turbo, each wheel has an active speed sensor that feeds information to the PSM control module (pp. 4.69-4.70).

"4511 Active Speed Sensor

The speed sensors provide information to the PSM control module about wheel speed. The speed sensors on the Cayenne are described as 'active speed sensors.' Active speed sensors require an external power supply.

A two-wire cable provides the connection to the control module. The active speed sensor is supplied with power and ground by the PSM control module. Operation of the sensor element integrated in the active speed sensor is based on the change in a resistance within an electronic system, depending on the strength and direction of a magnetic field. The pulse generator for the active speed sensor is integrated in the wheel bearng in the form of small magnetic plates in the seal ring. As a result of the rotational motion of the wheel bearing/seal ring the resistance in the sensor elements of the active speed sensor changes.

The change in resistance is converted into a digital speed signal by an electronic circuit in the sensor element and transmitted to the PSM control module."

Page 4.70 shows a diagram of the speed sensor.

Hope this helps.

[PaulW]

Thanks for the reply. I'll let my installer know and it may be helpful. I don't have the Technical Manual but does it describe the location of the wire or show a diamgram of where it is. I'm just hoping to avoid having to have him tear apart the whole dashboard to find the wire. If he can find the wire under the hood it may be easier. My guess is that there may be a couple of wires going to each wheel for the PSM and ABS, etc. He may only need to tap into one of them but it will save some time if we know which one (i.e. wire location, connector pin location, color of wire, etc.)

Thanks again,

Paul

[Loren]

Umm... I think they want the speedometer A wire which is used by all Porsche Nav systems. I don't know the color code on the Cayenne but it comes directly off the instrument cluster.

[cayenneak]

Hi Folks,

Picked up my new S on Thursday and the Alpine navigation system is going in next week (in the single DIN dash opening).  I need to locate the speed sensor wire to complete the install (well the installer needs this info).  Anyone know where that wire is?

Thanks,

Paul

Any possibility of a pic of the final install? Thinking about a similar upgrade...AK :)