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Part 2



PCM2/CDR23

Function of the components







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), external bus (optical)
- Amplifier optional (Harman or BOSE)
- CD changer
- Telephone/telematics

Applies only to PCM2:
- Media Oriented Systems Transport (MOST), internal (electrical)
- Voice control system (VOCS) (optional/insertion)
- Navigation (optional/insertion)
- Man Machine Interface (MMI)
- Single CD

Identification
The diagnosis software number and the part number for the PCM2 can be read out under this menu item.
1. Connect and start the 9588 Porsche System Tester II and switch on the ignition.
2. Select "Boxster (986)" in the Vehicle type menu and confirm with the [>>] key.
3. Select "PCM" in the control modules selection and confirm with the [>>] key.
4. Select "PCM2 GW" in the PCM2 function selection and confirm with the [>>] key.
5. Select "Identification" in the PCM2 GW function selection and confirm with the [>>] key.
6. "Diagnosis software number; PCM2 part number." appears on the display.
7. Confirm PCM2 GW extended identification with the key or the [F8] key.

Actual values
The unlock counter and supply voltage can be read out under the "Actual values" menu item.

Menu item Function
- Unlock counter The unlock counter can be read out during troubleshooting using this menu item.
- Connect and start the 9588 Porsche System Tester II and switch on the ignition.
- Select "Boxster (986)" in the Vehicle type menu and confirm with the [>>] key.
- Select "PCM" in the control modules selection and confirm with the [>>] key.
- Select "PCM2 GW" in the PCM2 function selection and confirm with the [>>] key.
- Select "Actual values" in the PCM2 GW function selection and confirm with the [>>] key.
- Select "Unlock counter" in the PCM2 GW actual values function selection and confirm with the [>>] key.
- Read out values from the display field.

- Supply voltage The supply voltage can be read out during troubleshooting using this menu item.
- Connect and start the 9588 Porsche System Tester II and switch on the ignition.
- Select "Boxster (986)" in the Vehicle type menu and confirm with the [>>] key.
- Select "PCM" in the control modules selection and confirm with the [>>] key.
- Select "PCM2 GW" in the PCM2 function selection and confirm with the [>>] key.
- Select "Actual values" in the PCM2 GW function selection and confirm with the [>>] key.
- Select "Supply voltage" in the PCM2 GW actual values function selection and confirm with the [>>] key.
- Read out values from the display field.

Lock/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 �seconds) "unlock".

Man Machine Interface (MMI)
The MMI is part of the PCM2 (on the main board). It carries out the diagnostics of the ring break diagnosis line (stub cable) and the diagnostics of the optical distribution line.

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.

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 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 units 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 - optical/electrical
MOST signals are transferred electrically within the PCM2 and optically outside of the PCM2. 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. 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 (depending on the equipment). The gateway node represents the connection to CAN comfort.

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 and wiring of the ring break diagnosis line are checked at regular intervals.

Input signals
The following queries can be run using this menu item:
- Registry startup status
- Internal ring startup status
- External ring startup status

NOTE: Deactivate the "automatic traffic announcement" before performing the diagnosis on the PCM2. If this is not done, the diagnosis will abort.

Menu item Function

- Registry startup status This menu item indicates whether installed MOST control modules can be read out from the actual installed components list.
- Connect and start the 9588 Porsche System Tester II and switch on the ignition.
- Select "Boxster (986)" in the Vehicle type menu and confirm with the [>>] key.
- Select "PCM" in the control modules selection and confirm with the [>>] key.
- Select "PCM2 GW" in the PCM2 function selection and confirm with the [>>] key.
- Select "Input signals" in the PCM2 GW function selection and confirm with the [>>] key.
- Select "Registry startup status" in the PCM2 GW input signals function selection and confirm with the [>>] key.
- Read out values from the display field.

- Internal ring startup This menu item indicates whether installed
status MOST control modules can be read out from the actual installed components list.
- Connect and start the 9588 Porsche System Tester II and switch on the ignition.
- Select "Boxster (986)" in the Vehicle type menu and confirm with the [>>] key.
- Select "PCM" in the control modules selection and confirm with the [>>] key.
- Select "PCM2 GW" in the PCM2 function selection and confirm with the [>>] key.
- Select "Input signals" in the PCM2 GW function selection and confirm with the [>>] key.
- Select "Startup status" in the PCM2 GW input signals function selection and confirm with the [>>] key.
- Read out values from the display field.
- "Internal ring startup status" internal MOST (electrical) is functional.

- External ring startup This menu item indicates whether installed
status MOST control modules can be read out from the actual installed components list.
- Connect and start the 9588 Porsche System Tester II and switch on the ignition.
- Select "Boxster (986)" in the Vehicle type menu and confirm with the [>>] key.
- Select "PCM" in the control modules selection and confirm with the [>>] key.
- Select "PCM2 GW" in the PCM2 function selection and confirm with the [>>] key.
- Select "Input signals" in the PCM2 GW function selection and confirm with the [>>] key.
- Select "Startup status" in the PCM2 GW input signals function selection and confirm with the [>>] key.
- Read out values from the display field.
- "External ring startup status" internal MOST (electrical) is functional.
- "External ring startup status "external MOST (optical) is functional.

Single CD
The CD player is part of the PCM2. It is used to play the audio CDs and navigation CDs and to update the navigation system.

Special function
The following functions can be run using this menu item:
- Antenna diversity test
- Set tuner frequency
- Reset
- Wake-up sequence of the MOST system

Voice control system (VOCS) (optional)
The VOCS 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 9588 Porsche System Tester II:
- Left balance
- Central balance
- Right balance
- Bass - maximum value
- Bass - minimum value
- Bass - centre position
- Rear fader
- Middle fader
- Front fader
- MOST power reduction
- MOST switch
- Mute
- MOST bus switch
- Output switch
- Treble - minimum value
- Treble - centre position
- Treble - maximum value
- Volume - maximum value
- Volume - minimum value
- Volume - centre position

NOTE: The activated drive link is automatically switched off after approximately 20 seconds.

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