CDR23 - Introduction

CDR23 - Introduction
The manual contains the diagnosis for the following system:
CDR23

General Instructions/Safety Instructions
The following points must be observed during vehicle diagnosis:
- After the battery is connected, volatile memories must be reprogrammed. In the case of radio coding and tuning, the customer must be informed of decoding and the deleted tuner memory.
- Deactivate the traffic broadcast TP ON' before beginning the diagnosis on CDR23. If this is not done, the system will crash.
- When working on the optical waveguide, please observe the instructions in assembly; refer Optical waveguide - MOST bus.
- After troubleshooting or repairs, erase the fault memory with the Porsche System Tester II No. 9588 and carry out a test drive.
- After the test drive, read out the fault memory again with the Porsche System Tester II No. 9588.

DANGER:
Danger of injury through triggering of driver's airbag
- Never hang the Porsche System Tester II No. 9588 over the steering wheel.

CAUTION:
Danger of damage due to improper handling of the battery and the control unit connectors.
- Never disconnect battery with engine running.
- Never start engine unless battery is connected securely.
- Never pull off or push on plug connections for the control modules or other electronic components when the ignition is switched on.

General Information On The Fault Memory

Fault code setting conditions
Fault codes can be set in several circumstances, e.g.:
- battery disconnected
- plug connections disconnected
- power failure

In these circumstances, no fault is present in the system and the fault memory must be erased.

Fault memory Info key F8
In order to be able to assess the fault exactly, the fault memory Info key F8 must be pressed. This information should be saved using the Save key F4 and printed out. If a fault code is stored with the status "not present" and no other problems are present, the fault memory must be erased.

Fault type - Frequency counter/Temperature/Voltage; Speed
Fault type The display shows whether the fault is:
- 'not present'
- 'present'

Frequency counter When a fault first occurs, a fault entry with the status 'present' is set in the fault memory and the counter is simultaneously set to '50'.
If a fault is present, the counter is incremented by one whenever the system is 'booted'. The maximum count is 255.
The counter is decremented if the status 'fault no longer present' is entered and the fault does not occur again when the system is 'booted'. The entry in the fault memory is erased automatically when the counter reaches 0.
If the error occurs again when the counter is between 1 and 49, the counter is reset to 50.
Temperature The value indicates the temperature (temperature sensor in the gateway) at the time the fault occurred. The temperature of the fibre optic transmitter is monitored: max 85 degree C.
Voltage The value indicates the voltage at the time the fault occurred.
Vehicle speed The value indicates the vehicle speed at the time the fault occurred.

Vehicle hand-over

NOTE:
The CDR23 is transferred into production mode (low-current mode) in production. As known from other systems (alarm system, instrument cluster, amplifier, roll-over bar), the CDR23 must be activated with the Porsche System Tester II No. 9588.
1. Connect and start the Porsche System Tester II No. 9588 and switch on the ignition.
2. Select 'Special functions' in the Vehicle type menu and confirm with the >> key.
3. Select 'Vehicle hand-over' in the Control units menu and confirm with the >> key.
4. Follow the instructions of the Porsche System Tester II No. 9588.

CDR23 Replacement
The CDR23 is supplied as a spare part in 'production mode ON'. Each time the vehicle is started, the stored CDR23 code is compared with the code in the instrument cluster. If they match the device is operational.

If no match is found, the device switches off after 30 seconds and the 'PROTECTED' message appears in the display. The device is not operational. The PCM2 code must be coded.

If a match is found, the device is operational. No further checks are made while the device is connected to the vehicle electrical system.