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CDR23



Data Transmission Error
If errors are detected when the data is decoded, this is known as a data transmission error. The errors can arise when data are being coded, transferred when the optical input level is too low or when being decoded. A fault entry is not recorded.

Gateway
The gateway is integrated in the CDR23. It is a fixed component of each CDR23. It provides a connection from the CAN Comfort to the MOST via its node. Diagnostic and useful data is exchanged with the CAN via these nodes. It creates links to the following systems:
- CAN comfort
- Media Oriented Systems Transport (MOST), internal (electrical)
- Single CD
- Media Oriented Systems Transport (MOST), external bus (optical)

Identification
The diagnosis software number and the part numbers for the PCM2 can be read out under this menu item.
1. Connect and start the Porsche System Tester II 9588 and switch on the ignition
2. Select 911 Turbo (996) in the Vehicle type menu and confirm with the ->| key
3. Select PCM in the control units selection and confirm with the >> key.
4. Select CDR23 in the 911 (996) CDR23 function selection and confirm with the >> key.
5. Select the menu item Identification and confirm with the >> key
6. The message Diagnosis software number; CDR23 part number. appears on the display
7. Extended identification can be called up with the F8 key.

The following data are displayed:
- CRIN (Car Radio Identification Number)
- VIN (Vehicle Identification Number)
- Part number
- System Supplier ECU Hardware No. (cw, year)
- System Supplier ECU Hardware Version Number
- System Supplier ECU Software Number (cw, year)
- System Supplier ECU Software Version Number
- Porsche workshop number
- Diagnosis software number
- Date of ECU Manufacturing (YYYY;MM;DD).

Actual values
It is possible to read out the unlock counter under the Actual values menu item.

Menu item
- Unlock counter

Function
Under this menu item, it is possible to check the electrical and optical MOST during troubleshooting.
- Connect and start the Porsche System Tester II 9588 and switch on the ignition
- Select 911 Turbo (996) in the Vehicle type menu and confirm with the ->| key
- Select PCM in the Control units selection menu and confirm with the >> key
- Select CDR23 in the 911 Turbo (996) CDR23 function selection menu and confirm with the >> key.
- Select Actual values in the CDR23 function selection menu and confirm with the >> key.
- Select Unlock counter in the CDR23 actual values menu and confirm with the >> key.
- Read out displayed values.

Menu item
- Transmission errors

Function
Using this menu item, the transmission errors can be read out.
- Connect and start the Porsche System Tester II 9588 and switch on the ignition.
- Select 911 Turbo (996) in the Vehicle type menu and confirm with the ->| key
- Select PCM in the Control units selection menu and confirm with the >> key
- Select CDR23 in the 911 Turbo (996) CDR23 function selection menu and confirm with the >> key.
- Select Actual values in the CDR23 function selection menu and confirm with the >> key.
- Select Transmission errors in the CDR23 actual values menu and confirm with the >> key
- Read out displayed values.

Menu item
- Traffic broadcast loudspeaker boost

Function
Using this menu item, you can read out the coded traffic broadcast loudspeaker boost.
- Connect and start the Porsche System Tester II 9588 and switch on the ignition.
- Select 911 Turbo (996) in the Vehicle type menu and confirm with the ->| key
- Select PCM in the Control units selection menu and confirm with the >> key
- Select CDR23 in the 911 Turbo (996) CDR23 function selection menu and confirm with the >> key.
- Select Actual values in the CDR23 function selection menu and confirm with the >> key.
- Select Traffic broadcast loudspeaker boost in the CDR23 actual values menu and confirm with the >> key
- Read out displayed values.

Menu item
- Supply voltage

Function
You can read out the supply voltage of the CDR23 using this menu item.
- Connect and start the Porsche System Tester II 9588 and switch on the ignition.
- Select 911 Turbo (996) in the Vehicle type menu and confirm with the ->| key
- Select PCM in the Control units selection menu and confirm with the >> key
- Select CDR23 in the 911 Turbo (996) CDR23 function selection menu and confirm with the >> key.
- Select Actual values in the CDR23 function selection menu and confirm with the >> key.
- Select Supply voltage in the CDR23 actual values menu and confirm with the >> key
- Read out displayed values.

Lock/Unlock
A lock occurs when the signal sent from the MMI via the optical/electrical MOST is understood by the connected MOST control units and a correct optical MOST signal is present at the MMI. Lock is maintained until the signal is unintelligible for quite a long period (several �seconds) (Unlock).

MOST actual and required installed components lists
All MOST control units that are connected to the PCM2 are entered in the required installed components list. An actual installed components list is written and saved when the PCM2 is started.

Menu item
- MOST actual installed components list

Function
Under this menu item, the components identified by the system as operational and entered in the MOST actual installed components list can be displayed.
- Connect and start the Porsche System Tester II 9588 and switch on the ignition.
- Select 911 Turbo (996) in the Vehicle type menu and confirm with the ->| key
- Select PCM in the Control units selection menu and confirm with the >> key
- Select CDR23 in the 911 Turbo (996) CDR23 function selection menu and confirm with the >> key.
- Select MOST actual installed components list in the CDR23 function selection menu and confirm with the >> key
- The components identified by the system are listed (depending on the equipment).

Menu item
- MOST required installed components list

Function
Using this menu item, the transmission errors can be read out.
- Connect and start the Porsche System Tester II 9588 and switch on the ignition.
- Select 911 Turbo (996) in the vehicle type menu and confirm with the ->| key.
- Select PCM in the Control units selection menu and confirm with the >> key
- Select CDR23 in the 911 Turbo (996) CDR23 function selection menu and confirm with the >> key.
- Select MOST required installed components list in the CDR23 function selection menu and confirm with the >> key
- Select Components from selection list corresponding to vehicle equipment in the CDR23 MOST required installed components list menu and code with the F8 key.

MOST component check
The following checks are available under this menu item:
- MOST system check
- Ring break diagnosis
- Ring break diagnosis line
- Optical performance check

NOTE: The engine must not be started during the automatic check. Follow the instructions of the Porsche System Tester II 9588:

Test sequences are automatic. The test results are displayed.

Menu item
- MOST system check

Function
Using this menu item, an automatic MOST system check can be carried out.
- Connect and start the Porsche System Tester II 9588 and switch on the ignition.
- Select 911 Turbo (996) in the Vehicle type menu and confirm with the ->| key
- Select PCM in the Control units selection menu and confirm with the >> key
- Select MOST component check in the 911 Turbo (996) CDR23 function selection menu and confirm with the >> key.
- Select MOST system check in the CDR23 MOST component check menu and confirm with the >> key.
- The test result is displayed. Before replacing control units, the optical waveguide and the ring break diagnosis line must be checked.

Menu item
- Ring break diagnosis

Function
Using this menu item, an automatic ring break diagnosis can be carried out.
- Connect and start the Porsche System Tester II 9588 and switch on the ignition.
- Select 911 Turbo (996) in the Vehicle type menu and confirm with the ->| key
- Select PCM in the Control units selection menu and confirm with the >> key
- Select MOST component check in the 911 Turbo (996) CDR23 function selection menu and confirm with the >> key.
- Select MOST ring break diagnosis in the CDR23 MOST component check menu and confirm with the >> key.
- The test result is displayed.

Before replacing control units, the optical waveguide and the ring break diagnosis line must be checked.

Menu item
- Ring break diagnosis line

Function
Using this menu item, an automatic check of the ring break diagnosis line can be carried out.
- Connect and start the Porsche System Tester II 9588 and switch on the ignition.
- Select 911 Turbo (996) in the Vehicle type menu and confirm with the ->| key
- Select PCM in the Control units selection menu and confirm with the >> key
- Select MOST component check in the 911 Turbo (996) CDR23 function selection menu and confirm with the >> key.
- Select MOST ring break diagnosis line in the CDR23 MOST component check menu and confirm with the >> key.
- The check results are displayed.
Before replacing control units, the optical waveguide and the ring break diagnosis line must be checked.

Menu item
- Optical performance check

Function
Using this menu item, the transmission errors can be read out.
- Connect and start the Porsche System Tester II 9588 and switch on the ignition.
- Select 911 Turbo (996) in the Vehicle type menu and confirm with the ->| key
- Select PCM in the Control units selection menu and confirm with the >> key
- Select MOST component check in the 911 Turbo (996) CDR23 function selection menu and confirm with the >> key.
- Select Optical performance check in the CDR23 MOST component check menu and confirm with the >> key.
- The check results are displayed.
FunctionBefore replacing control units, the optical waveguide and the ring break diagnosis line must be checked.


MOST - optical
MOST signals are transferred optically via the optical waveguide to the MOST control units that are installed externally.

The CDR23 gateway node constitutes the connection to CAN Comfort. The optical waveguide creates the connection to the nodes in the external MOST control units such as external amplifiers and/or CD changers (depending on the equipment).

Ring break diagnosis line
The diagnosis distribution line is an electrical lead, which, as a stub cable, connects the individual MOST control units in the system with one another. The existing MOST control units are checked at regular intervals during communication with the control units via the electrical/optical MOST.

Input signals
The following queries can be run using this menu item:
- Key code
- Status of the optical performance check
- Tuner parameters
- GAL (noise-dependent loudspeaker boost)

NOTE: Deactivate the automatic traffic announcement before performing the diagnosis on the CDR23. If this is not done, the system will crash.

Menu item
- Key code

Function
Under this menu item, the function of the CDR23 operating buttons can be checked.
- Connect and start the Porsche System Tester II 9588 and switch on the ignition.
- Select 911 Turbo (996) in the Vehicle type menu and confirm with the ->| key
- Select PCM in the Control units selection menu and confirm with the >> key
- Select CDR23 in the 911 Turbo (996) CDR23 function selection menu and confirm with the >> key.
- Select Input signals in the CDR23 function selection menu and confirm with the >> key.
- Select Key code in the 911 Turbo (996) CDR23 input signals menu and confirm with the >> key
- By operating the buttons of the CDR23, the correct function of each key code is displayed.

Menu item
- Status of the optical performance check

Function
Using this menu item, the result of the optical performance check can be read out.
- Connect and start the Porsche System Tester II 9588 and switch on the ignition.
- Select 911 Turbo (996) in the Vehicle type menu and confirm with the ->| key
- Select PCM in the Control units selection menu and confirm with the >> key
- Select CDR23 in the 911 Turbo (996) CDR23 function selection menu and confirm with the >> key.
- Select Input signals in the 911 Turbo (996) CDR23 function selection menu and confirm with the >> key.
- Select Status of optical performance check in the CDR23 input signals menu, mark with the > key and confirm with the >> key.
- The result can be read out.

Menu item
- Tuner parameters

Function
Using this menu item, each country coding of the tuner can be read out.
- Connect and start the Porsche System Tester II 9588 and switch on the ignition.
- Select 911 Turbo (996) in the Vehicle type menu and confirm with the ->| key
- Select PCM in the Control units selection menu and confirm with the >> key
- Select CDR23 in the 911 Turbo (996) CDR23 function selection menu and confirm with the >> key.
- Select Input signals in the 911 Turbo (996) CDR23 function selection menu and confirm with the >> key.
- Select Tuner parameters in the 911 Turbo (996) CDR23 input signals menu using the > key and confirm with the >> key.
- The currently coded country code is displayed in the CDR23 Tuner parameters menu.

Menu item
- GAL (noise-dependent loudspeaker boost)

Function
Using this menu item, the coded GAL value can be read out.
- Connect and start the Porsche System Tester II 9588 and switch on the ignition.
- Select 911 Turbo (996) in the Vehicle type menu and confirm with the ->| key
- Select PCM in the Control units selection menu and confirm with the >> key
- Select CDR23 in the 911 Turbo (996) CDR23 function selection menu and confirm with the >> key.
- Select Input signals in the 911 Turbo (996) CDR23 function selection menu and confirm with the >> key.
- Select and mark GAL (noise-dependent loudspeaker boost) in the 911 Turbo (996) CDR23 input signals menu with the > key and confirm with the >> key.
- The current coded value is displayed in the 911 Turbo (996) CDR23 noise-dependent loudspeaker menu.

Single CD
The CD player is part of the CDR23.

Drive links
Drive links of the CDR23 can be activated with this menu item. This allows the function of the drive links to be assessed very quickly using the Porsche System Tester II 9588.

The following drive links can be activated:
- All On display test
- Display check

Menu item
- All On display test

Function
Under this menu item, the function of the CDR23 display segments can be checked.
- Connect and start the Porsche System Tester II 9588 and switch on the ignition.
- Select 911 Turbo (996) in the Vehicle type menu and confirm with the ->| key
- Select PCM in the Control units selection menu and confirm with the >> key
- Select CDR23 in the 911 Turbo (996) CDR23 function selection menu and confirm with the >> key.
- Select Drive links in the 911 Turbo (996) CDR23 function selection menu and confirm with the >> key.
- Select All On display test in the CDR23 drive links menu using the > key and confirm with the >> key.
- Press the F8 key to start the test.
- All segments of the CDR23 display are activated and can be checked for operation.

CDR23 control unit
The CDR23 is installed in the vehicle with and without amplifier (internal).

The CDR23 with amplifier (internal) is used if no external amplifier (Harman or BOSE) is installed.

The CDR23 without amplifier (internal) is used if a sound package is installed.

NOTE: If the the CDR23 has no external amplifier (Harman or BOSE) and there is no CD changer installed, an optical waveguide bridge must be fitted to the optical waveguide socket.

The CDR23 control unit includes the following components:

Internal:
CDR23 GW
Internal amplifier (optional, depending on the equipment)
Tuner
Single CD
Wake-up and distribution line diagnosis control
Controller Area Network (CAN) Comfort

External:
External amplifier (optional, Harman or BOSE)
CD changer (CDC), (optional)
Tuner
The tuner is part of the PCM2 and is installed on the main board.

Unlock counter
Interruptions occur in the system if perfect communication is no longer possible. If the relevant threshold values are exceeded, an entry is recorded in the appropriate control unit and the unlock counter is incremented.

External amplifier
The external amplifier (Harman or BOSE) is available as an optional feature and is linked to the CDR23 via the optical waveguide.

Internal amplifier
The optional internal amplifier (depending on equipment) is part of the PCM2 (installed on the main board).

Wake-up function
In an idle state, all control units connected to the CDR23 are in sleep mode. When the CDR23 is switched on, the light is switched on via the Gateway. It is regenerated and passed on by the MOST control units connected.
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