External Harman Amplifier
Data Transfer Fault
If faults are detected when the data is decoded, this is known as a data transfer fault. The faults can arise when the data is encoded, when the data is transferred through an input level that is optically too low or when the data is decoded. A fault entry is not recorded.
Function Of The Components
NOTE:
- When the PCM2 is replaced, the coding must be performed in accordance with the connected MOST control modules.
- When the Switch closed parameter is set, the switch remains closed even in existing MOST control modules. Communication is not possible.
Gateway
The gateway is integrated in the PCM2. Together with the MMI, it is a fixed component of each PCM2. It provides a connection to CAN comfort via its nodes. 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)
- Voice control system (VOCS) (optional/insertion)
- Navigation (optional/insertion)
- Man Machine Interface (MMI)
- 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 (996) in the Vehicle type menu and confirm with the >> key.
3. Select PCM in the Control modules menu and confirm with the >> key.
4. Select External Harman amplifier in the 911 (996) PCM2 function selection and confirm with the >> key.
5. Select Identification in the 911 (996) external Harman amplifier function selection and confirm with the >> key.
6. Diagnosis software number; PCM2 parts number appears on the display.
Actual values
It is possible to read out the following values under the Actual values menu item.
- Vehicle speed
- Transmission errors
- Unlock counter
- Supply voltage
Menu item
- Vehicle speed
Function
You can read out the speed during troubleshooting under this menu item.
- Connect and start the Porsche System Tester II 9588 and switch on the ignition.
- Select 911 (996) in the Vehicle type menu and confirm with the >> key.
- Select PCM in the Control modules menu and confirm with the >> key.
- Select External Harman amplifier in the 911 (996) PCM2 function selection and confirm with the >> key.
- Select Actual values in the 911 (996) external Harman amplifier function selection and confirm with the >> key.
- Select Speed in the 911 (996) external Harman amplifier actual values function selection and confirm with the >> key.
- Read out values from the display field.
Menu item
- Transmission errors
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 (996) in the Vehicle type menu and confirm with the >> key.
- Select PCM in the Control modules menu and confirm with the >> key.
- Select External Harman amplifier in the 911 (996) PCM2 function selection and confirm with the >> key.
- Select Actual values in the 911 (996) external Harman amplifier function selection and confirm with the >> key.
- Select Transmission errors in the 911 (996) external Harman amplifier actual values function selection and confirm with the >> key.
- Read out values from the display field.
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 (996) in the Vehicle type menu and confirm with the >> key.
- Select PCM in the Control modules menu and confirm with the >> key.
- Select External Harman amplifier in the 911 (996) PCM2 function selection and confirm with the >> key.
- Select Actual values in the 911 (996) external Harman amplifier function selection and confirm with the >> key.
- Select the Unlock counter menu item using the > key and confirm with the >> key.
- Read out values from the display field.
Menu item
- Supply voltage
Function
You can check the supply voltage of the external Harman amplifier during troubleshooting using this menu item.
- Connect and start the Porsche System Tester II 9588 and switch on the ignition.
- Select 911 (996) in the Vehicle type menu and confirm with the >> key.
- Select PCM in the Control modules menu and confirm with the >> key.
- Select External Harman amplifier in the 911 (996) PCM2 function selection and confirm with the >> key.
- Select Actual values in the 911 (996) external Harman amplifier function selection and confirm with the >> key.
- Select Supply voltage in the 911 (996) external Harman amplifier actual values function selection and confirm with the >> key.
- Read out values from the display field.
Man Machine Interface (MMI)
The MMI is part of the PCM2 (on the mainboard). It carries out the diagnostics of the ring break diagnosis line (stub cable) and the diagnostics of the optical distribution line.
MOST Actual And Required Installed Components Lists
All MOST control modules that are connected to the PCM2 are entered via diagnostic tester in the required installed components list. Only the MOST control modules recorded in the MOST required installed components list are activated. An actual installed components list of detected devices is written and saved when the PCM2 is started.
MOST lock/MOST unlock
A lock occurs when the signal sent from the MMI via the MOST optical/electrical is understood and answered by the connected MOST control modules. This applies a correct optical MOST signal. The lock is maintained until the signal is no longer detectable for a longer period of time (several micro seconds) unlock.
MOST - optical/electrical
MOST signals are transferred electrically within the PCM/CDR23 and optically outside of the PCM/CDR23. Internally, the PCM2 consists of at least 2 nodes (GW and MMI), which are installed in the device and can also be expanded to four nodes by adding the navigation and VOCS nodes (optional). Internally, the CDR23 consists of one node (GW) which is installed in the CDR23.
The data is transferred outside of the PCM2 via the optical waveguide, which creates a connection to the nodes in the external MOST control modules such as external amplifiers, CD changers, and/or telephone/telematics (optional, depending on the equipment). The data is transferred outside of the CDR23 via the optical waveguide, which creates a connection to the nodes in the external MOST control modules such as external amplifiers and/or CD changers (depending on the equipment). The gateway node represents the connection to CAN comfort.
MOST switch
The MOST switch is part of the PCM2. It keeps the electrical MOST closed if no other MOST control module is optically connected to the MOST. The MOST switch is opened when a light signal is received from the connected MOST control modules.
The following settings can be coded:
- MOST switch open
- MOST switch closed
NOTE:
- When the PCM2 is replaced, the coding must be performed in accordance with the connected MOST control modules.
- When the Switch closed parameter is set, the switch remains closed even in existing MOST control modules. Communication is then not possible.
MOST 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 module and the unlock counter is incremented.
Navigation
The navigation module is designed as a module box, which can be inserted in the PCM2 as an option. After the insertion, an electronic switch is opened automatically and the module is integrated into the MOST ring.
Ring break diagnosis line
The ring break diagnosis line is an electrical lead, which, as a stub cable, connects the individual MOST control modules in the system with one another. The existing MOST control modules are checked at regular intervals during communication with the control modules via the electrical/optical MOST.
Input signals
The following queries can be run using this menu item:
- 3 dB loss
NOTE: Deactivate the automatic traffic announcement before performing the diagnosis on the PCM2. If this is not done, the diagnosis will abort.
Menu item
- 3 dB loss
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 (996) in the Vehicle type menu and confirm with the >> key.
- Select PCM in the Control modules menu and confirm with the >> key.
- Select External Harman amplifier in the 911 (996) PCM2 function selection and confirm with the >> key.
- Select Input signals in the 911 (996) external Harman amplifier function selection and confirm with the >> key.
- Select 3 dB lowering in the external Harman amplifier input signals function selection using the > key and confirm with the >> key.
- Read out values from the display field.
Single CD
The CD player is part of the PCM2. It is used to play the audio and navigation CDs as well as to update the navigation system.
Special function
The following functions can be run using this menu item:
- Antenna diversity test
- Set tuner frequency
- Reset
- Wakeup sequence of the MOST system
Voice control system (VOCS (optional))
The VOCS (optional) is designed as a module box which can be pushed into the PCM2 (optional). After the insertion, an electronic switch is opened and the module is integrated into the MOST ring.
Drive Links
Drive links of the PCM2 can be activated with this menu item. This allows the function of the drive links to be assessed very quickly.
The following drive links can be activated with the Porsche System Tester II 9588 :
- MOST bus switch on
- MOST bus switch off
- MOST power reduction - start
- MOST power reduction - stop
- Output switch on
- Output switch off
- Volume - minimum value
- Volume - centre position
- Volume - maximum value
- Front fader
- Middle fader
- Rear fader
- Left balance
- Central balance
- Right balance
- Bass - minimum value
- Bass - centre position
- Bass - maximum value
- Treble - minimum value
- Treble - centre position
- Treble - maximum value
- Open MOST switch
- MOST switch closed
- Mute off
- Mute on
NOTE: The activated drive link is automatically switched off after approximately 20 seconds.