Operation CHARM: Car repair manuals for everyone.
Home >> Porsche >> 2004 >> Boxster (986) F6-2.7L >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Relays and Modules - Computers and Control Systems >> Body Control Module >> Testing and Inspection >> Telephone/Telematics Control Module Function

Telephone/Telematics Control Module Function



PCM2/CDR23

Telephone/telematics control module function

Terminating resistors in the CAN
Terminating resistors are fitted to each end of the wiring to prevent reflection on the wiring. These terminating resistors are integrated into each control module. The interconnection prevents the resistors from being measured with the ohmmeter from the outside.

CAN Comfort
Communication between the Porsche System Tester II No. 9588 and the MOST control modules only takes place via the K lead to the instrument cluster. The data is transferred from the instrument cluster gateway to the MOST control modules, via CAN Comfort to the PCM2 gateway, via the electrical MOST in the PCM2 and via the optical MOST outside of the PCM2.

CD changer (CDC)
The CDC is available as an optional feature and is linked to the PCM2 via the optical waveguide.

Coding table


Part 1:




Part 2:






Coding
Under the menu item "Modify coding", the telephone can be coded for a passive telephone handset (optional).

Menu item Function

- Passive telephone Using this menu item, you can code a
handset (optional) passive handset (optional).

- Connect and start the Porsche System Tester II No. 9588 and switch on the ignition
- Select vehicle type Boxster (986) and control unit PCM2 and press the [>>] key
- Select menu item Coding
- Select "Passive telephone handset" and code it with the [F8] key

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.

Installation position of the control module
The telephone control module is installed under the passenger's seat.

Extended identification
Additional data present in the control unit can be read out using 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 modules selection and confirm with the [>>] key
4. Select "Telephone/telematics" 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 (YYYY;MM;DD)
- 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 Porsche System Tester II No. 9588 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

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

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 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 component check
The following checks are available under this menu item:
- MOST system check
- Ring break diagnosis
- Ring break diagnosis line
- Optical performance check

NOTE: The engine must not be started during the automatic check. Follow the instructions of the Porsche System Tester II No. 9588:

Test sequences are automatic. The test results are displayed.

Menu item Function

- MOST system check Using this menu item, an automatic MOST system check can be carried 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 selection menu and confirm with the [>>] key
- Select "MOST component check" in the Boxster (986) CDR23 function selection menu and confirm with the [>>] key
- Select "MOST system check" in the CDR23 MOST component check menu and confirm with the [>>] key
- The test result is displayed
Before replacing control units, the optical waveguide and the ring break diagnosis line must be checked.

- Ring break diagnosis Using this menu item, an automatic ring break diagnosis can be carried 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 selection menu and confirm with the key
- Select "MOST component check" in the Boxster (986) CDR23 function selection menu and confirm with the [>>] key
- Select "MOST ring break diagnosis" in the Boxster (986) CDR23 MOST component check menu and confirm with the [>>] key
- The test result is displayed
Before replacing control units, the optical waveguide and the ring break diagnosis line must be checked.

- Ring break diagnosis line Using this menu item, an automatic check of the ring break diagnosis line can be carried 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 selection menu and confirm with the [>>] key
- Select "MOST component check" in the Boxster (986) CDR23 function selection menu and confirm with the [>>] key
- Select "MOST ring break diagnosis line" in the Boxster (986) CDR23 MOST component check menu and confirm with the [>>] key
- The test result is displayed
Before replacing control units, the optical waveguide and the ring break diagnosis line must be checked.

- Optical performance check Using this menu item, the transmission errors 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 selection menu and confirm with the [>>] key
- Select "MOST component check" in the Boxster (986) CDR23 function selection menu and confirm with the [>>] key
- Select "Optical performance check" in the Boxster (986) CDR23 MOST component check menu and confirm with the [>>] key
- The test result is displayed
Before replacing control units, the optical waveguide and the ring break diagnosis line must be checked.

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.

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.

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:
- 3 dB check

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

- 3 dB check 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 "Telephone/telematics" in the PCM2 function selection and confirm with the [>>] key
- Select "Input signals" in the PCM2 telephone/telematics function selection and confirm with the [>>] key
- Select "3 dB check" in the Telephone/telematics input signals function selection and confirm with the [>>] key
- Read out values from the display field

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:
- 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 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)
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.

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 mainboard).

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 mainboard).

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