External BOSE Amplifier - Introduction

External BOSE Amplifier - Introduction
The manual contains the diagnosis for the following system:
External BOSE amplifier

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 'automatic traffic announcement' before beginning the diagnosis on the PCM2. 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 "not present" status and no other problems are present, then the fault memory must be erased.

Fault type - Frequency counter/Temperature/Voltage; Speed/Time of occurrence
Fault counter When a fault first occurs, a fault entry with the status present' is made in the fault memory and the counter is simultaneously set to '50'.
If a fault is present, the counter is incremented by 1 each time you 'boot' the system. The maximum count is 255.
The counter is decremented if the status 'fault' no longer present is recorded and the fault does not occur when you 'boot'. The fault memory is automatically erased when the counter reaches 0.
If the error occurs again when the counter is between 1 and 49, the counter is reset to 50.
Lock status of
MOST ring The display shows which fault type has occurred:
- lock
- unlock

Supply voltage
fault type The display shows which fault type has occurred:
- no fault type
- not present

Supply voltage The value indicates the voltage at the time the fault occurred.

Vehicle hand-over
The external BOSE amplifier control unit is converted to delivery mode (low-current mode) in production. As known from other systems (alarm system, instrument cluster, roll-over bar), the PCM2 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.

Control Module Replacement - PCM2
The PCM2 is supplied in 'active production mode' in new vehicles and as a spare part. Each time the vehicle is started, the model range code that is stored is compared with the code in the instrument cluster. Provided no match is found, the device switches off after 30 seconds and the 'PROTECTED' message appears in the display. The device is not operational.

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

Replacing CDR23 Control Modules
The PCM2 is converted to delivery mode (low-current mode) in production. As known from other systems (alarm system, instrument cluster, roll-over bar), the PCM2 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.