Operation CHARM: Car repair manuals for everyone.
Home >> Porsche >> 2004 >> Boxster (986) F6-2.7L >> Repair and Diagnosis >> Accessories and Optional Equipment >> Relays and Modules - Accessories and Optional Equipment >> General Module >> Testing and Inspection >> PCM2/CDR23 MMI >> PCM2 MMI Control Module Function >> Function of the Components

Function of the Components



Control Unit Function - MMI (part 2)

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 Porsche System Tester II No. 9588 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 units selection menu and confirm with the >> key
4. Select 'PCM2 MMI' in the PCM2 function selection and confirm with the >> key
5. Select 'Identification' in the PCM2 MMI function selection and confirm with the >> key
6. "Diagnosis software number; PCM2 parts number" appears on the display

Actual Values
Under the 'Actual values' menu item, the date, time, traffic broadcast loudspeaker boost, time zone and the unlock counter can be read out.

Menu item Function

- Date Using this menu item, you can read out the current date from the PCM2.
- Connect and start the Porsche System Tester II No. 9588 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 'PCM2 MMI' in the Boxster (986) function selection and confirm with the >> key
- Select 'Actual values' in the Boxster (986) PCM2 MMI function selection and confirm with the >> key
- Select "Date" in the PCM2 MMI actual values function selection and confirm with the >> key
- Read out values from the display field
- Transmission errors Using this menu item, you can read out the number of transmission errors from the PCM2.
- Connect and start the Porsche System Tester II No. 9588 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 'PCM2 MMI' in the Boxster (986) PCM2 function selection and confirm with the >> key
- Select 'Actual values' in the PCM2 MMI function selection and confirm with the >> key
- Select 'Transmission errors' in the PCM2 MMI actual values function selection and confirm with the >> key
- Read out values from the display field
- Time Using this menu item, you can read out the current time from the PCM2.
- Connect and start the Porsche System Tester II No. 9588 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 'PCM2 MMI' in the Boxster (986) PCM2 function selection and confirm with the >> key
- Select 'Actual values' in the PCM2 MMI function selection and confirm with the >> key
- Select "Time" in the PCM2 MMI actual values function selection and confirm with the >> key
- Read out values from the display field
- Unlock counter Using this menu item, you can read out the unlock counter.
- Connect and start the Porsche System Tester II No. 9588 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 'PCM2 MMI' in the Boxster (986) PCM2 function selection and confirm with the >> key
- Select 'Coding' in the PCM2 MMI function selection and confirm with the >> key
- Select "Unlock counter" in the PCM2 MMI coding function selection and confirm with the >> key
- Read out values from the display field
- Traffic broadcast
loudspeaker boost Using this menu item, setting of the traffic broadcast loudspeaker boost can be read out.
- Connect and start the Porsche System Tester II No. 9588 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 'PCM2 MMI' in the Boxster (986) PCM2 function selection and confirm with the >> key
- Select 'Coding' in the PCM2 MMI function selection and confirm with the >> key
- Select 'Loudspeaker boost' in the PCM2 MMI coding function selection and confirm with the >> key
- Read out values from the display field
- Time zone Using this menu item, you can read out the current time zone from the PCM2.
- Connect and start the Porsche System Tester II No. 9588 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 'PCM2 MMI' in the Boxster (986) PCM2 function selection and confirm with the >> key
- Select 'Coding' in the PCM2 MMI function selection and confirm with the >> key
- Select 'Time zone' in the PCM2 MMI coding 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 wake-up/diagnosis distribution line is understood and answered by the connected MOST control modules; this results in a 'lock (connection)'. The lock is maintained until the signal disappears, i.e. an 'unlock' occurs.

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 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:
- Key code
- Increment steps

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

- Key code Under this menu item, it is possible to check that the operating buttons are functioning during troubleshooting.
- Connect and start the Porsche System Tester II No. 9588 and switch on the ignition
- Select 'Boxster' in the Vehicle type menu and confirm with the >> key
- Select 'PCM' in the Control units selection menu and confirm with the >> key
- Select 'PCM2 MMI' in the PCM2 function selection and confirm with the >> key
- Select 'Input signals' in the PCM2 MMI function selection and confirm with the >> key
- 'Key code' is displayed on the Porsche System Tester II No. 9588 . The function is activated by marking with the > key and actuating the >> key
- If functioning correctly, the relevant code appears on the tester's display field when the operating buttons are activated
- Increment steps This menu item shows the current status of the operating button.
- Connect and start the Porsche System Tester II No. 9588 and switch on the ignition
- Select 'Boxster' in the Vehicle type menu and confirm with the >> key
- Select 'PCM' in the Control units selection menu and confirm with the >> key
- Select 'PCM2 MMI' in the PCM2 function selection and confirm with the >> key
- Select 'Input signals' in the PCM2 MMI function selection and confirm with the >> key
- 'Increment steps' is displayed on the Porsche System Tester II No. 9588. The function is activated by marking with the > key and actuating the >> key
- If functioning correctly, the relevant code appears on the tester's display field when the operating buttons are activated

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

Special Function
The following functions can be run using this menu item:
- Read address book
- Write to address book
- Read user data
- Write user data
- Read coding
- Write coding
- MOST actual installed components list

Voice Control System (VOCS)
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 Porsche System Tester II No. 9588:
- Display colour black
- Display colour "coloured bars"
- Display colour blue
- Display colour red
- Display colour green
- Display colour white
- Set default values
- Ring break diagnosis
- Ring break line diagnosis

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

Menu item Function

- Display colour black Using this menu item, the function Display colour black can be checked.
- Connect and start the Porsche System Tester II No. 9588 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 'PCM2 MMI' in the Boxster (986) PCM2 function selection and confirm with the >> key
- Select 'Drive links' in the PCM2 MMI function selection and confirm with the >> key
- Select "Display colour black" in the PCM2 MMI drive link function selection and confirm with the F8 key
- The display must show the correct colour

Proceed in the same way with the following tests.
- Display colour "coloured bars"
- Display colour blue
- Display colour red
- Display colour green
- Display colour white

- Set default values Using this menu item, you can read out the set default values from the PCM2 MMI.
- Connect and start the Porsche System Tester II No. 9588 and switch on the ignition
- Select 'Boxster (986)' in the Vehicle type menu and confirm with the >> key
- Select 'PCM' in the Control units selection menu and confirm with the >> key
- Select 'PCM2 MMI' in the Boxster (986) PCM2 function selection and confirm with the >> key
- Select 'Set default values' in the Boxster (986) PCM2 MMI function selection and confirm with the >> key
- Read out values from the display field
- Ring break diagnosis Under this menu item, it is possible to check the electrical and optical MOST during troubleshooting.
- Connect and start the Porsche System Tester II No. 9588 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 'PCM2 MMI' in the Boxster (986) PCM2 function selection and confirm with the >> key
- Select 'Ring break diagnosis' in the Boxster (986) PCM2 MMI function selection and confirm with the >> key
- Read out values from the display field
- Ring break line
diagnosis Using this menu item, you can check the ring break diagnosis line.
- Connect and start the Porsche System Tester II No. 9588 and switch on the ignition
- Select 'Boxster (986)' in the Vehicle type menu and confirm with the >> key
- Select 'PCM' in the Control unit menu and confirm with the >> key
- Select 'PCM2 MMI' in the Boxster (986) PCM2 function selection and confirm with the >> key
- Select 'Ring break line diagnosis' in the Boxster (986) PCM2 MMI function selection and confirm with the >> key
- Read out values from the display field

PCM2 Control Module (Head Unit)
The PCM2 control module (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)
- CD changer (CDC), (optional)
- Telephone/telematics (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 electronically via the MOST. Data is transferred outside of the PCM2 via the optical MOST.

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.
pro multis · About Operation CHARM