986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - Need a little help making sense of Hi-Fi factory stereo wiring (2004 non-Bose)

Smallblock454 · 11-30-2018, 06:18 AM

Sorry you're totally wrong.

This is a CDR23.

The external amp gets his audio signal via MOST-Bus. That is the connector in the right top on the picture. MOST-Bus is an audio bus only. It doesn't switch anything on or off.

The external amp (HAES or BOSE) has it's own power supply cables and fuse and CAN bus wakeup.

The power on by the car get both components via interior CAN BUS signal (wake up signal). If you want to power on / off aftermarket audio components like the 986 does via putting the key in the ignition switch you'll need an adapter that generates that internal bus signal to a B+ switch signal.

Also there is a connection between the IC and the CDR23 via interior CAN BUS that shows radio stations and so on the IC.

The yellow connector is for interior CAN bus / wake up and unit programming. Don't mess with the yellow connector, else you will have CAN bus problems.

Regards, Markus

11-30-2018, 06:18 AM	#6
Smallblock454 Registered User Join Date: Jun 2014 Location: LB, Germany Posts: 1,456	Sorry you're totally wrong. This is a CDR23. The external amp gets his audio signal via MOST-Bus. That is the connector in the right top on the picture. MOST-Bus is an audio bus only. It doesn't switch anything on or off. The external amp (HAES or BOSE) has it's own power supply cables and fuse and CAN bus wakeup. The power on by the car get both components via interior CAN BUS signal (wake up signal). If you want to power on / off aftermarket audio components like the 986 does via putting the key in the ignition switch you'll need an adapter that generates that internal bus signal to a B+ switch signal. Also there is a connection between the IC and the CDR23 via interior CAN BUS that shows radio stations and so on the IC. The yellow connector is for interior CAN bus / wake up and unit programming. Don't mess with the yellow connector, else you will have CAN bus problems. Regards, Markus __________________ My Porsche keyfob, instrument cluster and alarm ecu repair service: https://sportwagendoktor.de Last edited by Smallblock454; 11-30-2018 at 01:49 PM.