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Part 2



PCM2/CDR23

Control unit function - navigation

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 data are being coded, transferred when the optical input level is too low or when being decoded. A fault entry is not recorded.

Extended identification
Additional data present in the control unit can be read out using 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 "Navigation" in the PCM2 function selection and confirm with the [>>] key.
5. Select the "Identification" menu item and press the [>>] key.
6. "Diagnosis software number; PCM2 part number." appears on the display.
7. Confirm PCM2 GW extended identification with the [F8] key or the [>>] key.

The following data can be read out:
- CRIN (Car Radio Identification Number)
- Date of ECU Manufacturing (DD;MM;YYYY)
- Repair Shop Code or Tester Serial Number
- System Supplier ECU Hardware Number (cw, year)
- System Supplier ECU Hardware Version Number
- System Supplier ECU Software Number (cw, year)
- System Supplier ECU Software Version Number
- Vehicle Manufacturer Diagnostic Index
- Vehicle Manufacturer ECU Hardware Number
- VIN (Vehicle Identification Number)

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), 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 9588 Porsche System Tester II and switch on the ignition.
2. Select vehicle type Boxster (986) and control unit PCM2 and press the [>>] key.
3. Select the "Identification" menu item and press the [>>] key.
4. "Diagnosis software number; PCM2 part number." appears on the display.

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

Menu item Function

- Unlock counter It is possible to check the electrical and optical MOST during troubleshooting under this menu item.

- Connect and start the 9588 Porsche System Tester II and switch on the ignition.
- Select vehicle type Boxster (986) and the PCM2 GW control unit and press the [>>] key.
- Select the Actual values menu item and press the [>>] key.
- Select the "Unlock counter" menu item using the [>] key and press 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.

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:
- Reverse-gear signal

NOTE: Deactivate the "automatic traffic announcement" before performing the diagnosis on the PCM2. If this is not done, the diagnosis will abort (applies only to software < 03).

Menu item Function

- Reverse-gear signal The reverse-gear signal can be read out 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 units menu and confirm with the [>>] key.
- Select "Navigation" in the Boxster (986) PCM2 function selection and confirm with the [>>] key.
- Select "Input signals" in the Boxster (986) navigation function selection and confirm with the [>>] key.
- Select "Reverse-gear signal" in the Boxster (986) Navigation input signals function selection and confirm with the [>>] key.
- Read out values from the display field.

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:
- 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.

PCM2 control module (head unit)
The PCM2 control unit (head unit) includes the following components:

Internal:
PCM2 gateway
PCM2 Man Machine Interface (MMI)
Amplifier (internal)
Tuner
Single CD
Navigation (optional/insertion)
VOCS (voice control system) (optional/insertion)
Controller Area Network (CAN) Comfort
MOST switch

External:
External amplifier (optional, Harman or BOSE)
Telephone/telematics (optional)
CD changer (CDC), (optional)

The PCM2 consists of at least two but a maximum of four MOST nodes, (Gateway, MMI and Navigation and VOCS (optional)), which communicate with each other via the electronic MOST. Data is transferred outside of the PCM2 via the optical MOST.

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.

Telephone/telematics
The telephone/telematics feature is available as an option and is linked to the PCM2 via the optical waveguide.

Tuner
The tuner is part of the PCM2 (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 module 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 PCM2 via the optical waveguide.

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

Wake-up function
All control units connected to the MOST are in sleep mode if the PCM2 is deactivated. When the PCM2 is switched on, a "light" is switched on via the MMI. It is reinforced and passed on by the MOST control modules that are connected.
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