General instructions/safety instructions
The following points must be observed during vehicle diagnosis
- After the battery is connected, volatile memories must be reprogrammed. In the case of radio coding and tuning, the customer must be informed of decoding and the deleted tuner memory.
- Deactivate the 'automatic traffic announcement' before beginning the diagnosis on the PCM2. If this is not done, the system will crash.
- When working on the optical waveguide, the instructions in assembly Optical waveguide - MOST bus are to be observed. Refer to «97 72 23 INSTALLING OPTICAL WAVEGUIDE - AS OF MY 2003 (ALL MODELS)»(ref-274627-S12003475892007121900000) .
- After troubleshooting or repairs, erase the fault memory with the Porsche System Tester II No. 9588 and carry out a test drive.
- After the test drive, read out the fault memory with the Porsche System Tester II No. 9588 again.
| WARNING | Danger of injury through triggering of driver's airbag Never hang the Porsche System Tester II No. 9588 over the steering wheel. |
| CAUTION | Danger of damage due to improper handling of the battery and the control unit connectors! |
- Never disconnect battery with engine running.
- Never start engine without securely connected battery.
- Never pull off or push on plug connections for the control units or other electronic components when the ignition is switched on
Fault code setting conditions
Fault codes can be set in several circumstances, e.g.
- battery disconnected
- plug connections disconnected
- power failure
In these circumstances, no fault is present in the system and the fault memory must be erased.
Fault memory Info key [F8]
In order to be able to assess the fault exactly, the fault memory Info key [F8] must be pressed. This information should be saved using the Save key [F4] and printed out. If a fault code is stored with "not present" status and no other problems are present, then the fault memory must be erased.
| Open circuit - short to ground / voltage short / version; vehicle parameters / counter | |
|---|---|
| Frequency counter | ? |
| CD number | ? |
REFERENCE CHART
Vehicle hand-over
The PCM2 is converted to delivery mode (low-current mode) in production. As known from other systems (alarm system, instrument cluster, roll-over bar), the PCM2 must be activated with the Porsche System Tester II No. 9588.
- Connect and start the Porsche System Tester II No. 9588 and switch on the ignition
- Select 'Special functions' in the Vehicle type menu and confirm with the [>>] key.
- Select 'Vehicle hand-over' in the control units menu and confirm with the [>>] key
- Follow the instructions of the Porsche System Tester II No. 9588.
The PCM2 is provided in 'active production mode' in new vehicles and as a spare part. Each time the vehicle is started, the chassis code that is stored is compared with the code in the instrument cluster. If no match is found, the device switches off after 30 seconds and the 'PROTECTED' message appears in the display. The device is not operational.
If a match is found, the device is operational.
Coding PCM2
- Connect and start the Porsche System Tester II No. 9588 and switch on the ignition
- Select 'Cayenne' in the Vehicle type menu and confirm with the [>>] key.
- Select 'PCM2' in the Control units menu and confirm with the [>>] key
- Select 'PCM2 MMI' in the PCM2 function selection and confirm with the [>>] key
- Select 'Coding' in the PCM2 MMI function selection and confirm with the [>>] key
- Select 'PCM2 code' in the PCM2 MMI coding function selection and confirm with the [>>] key
- Take the PCM2 code from 'IPAS', enter it in the form and code with the [>>] key
Scheme 24
Scheme 25
Scheme 26
Scheme 27
Scheme 28
Connector A
| Pin | Designation | Pin | Designation |
|---|---|---|---|
| A 1 | Pin 30 + | A 2 | Pin 31 |
| A 3 | Wake-up/diagnosis | A 4 | Not used |
| A 5 | Not used | A 6 | Not used |
PINOUTS REFERENCE (CONNECTOR A)
Connector B
| Pin | Designation | Pin | Designation |
|---|---|---|---|
| B 1 | Optical waveguide | B 2 | Optical waveguide |
PINOUTS REFERENCE (CONNECTOR B)
Terminating resistors on 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 unit. The interconnection prevents the resistors from being measured with the ohmmeter from the outside.
CAN Infotainment
Communication between the Porsche System Tester II No. 9588 and the MOST control units only takes place via the K lead to the instrument cluster. The data is transferred from the instrument cluster gateway to the MOST control units, 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
| Coding type | PCM2 GW | PCM2 MMI | CDR23 | Navigation | BOSE amplifier | CD changer | Telephone |
|---|---|---|---|---|---|---|---|
| ABS pulse number | X | ||||||
| Call automatically accepted | X | ||||||
| Display format | X | X | |||||
| Configuration Options Handset | X | X | |||||
| Date | X | X | |||||
| Units | X | X | X | ||||
| Vehicle type vehicle coding | X | X | X | X | |||
| Vehicle version vehicle coding | X | X | X | X | |||
| Right/left-hand drive vehicle coding | X | X | X | X | X | ||
| Wheel size | X | ||||||
| GAL (NLB) | X | X | |||||
| Height/width in per cent | X | ||||||
| Air conditioning | X | X | |||||
| Country coding | X | X | X | ||||
| Main set-up menu | X | ||||||
| MOST required installed components list | X | X | |||||
| Engine version | X | ||||||
| PCM2 code | X | X | X | X | |||
| Porsche Assistance, international designation | X | ||||||
| Porsche Assistance, international number | X | ||||||
| Porsche Assistance menu | X | ||||||
| Porsche Assistance, national designation | X | ||||||
| Porsche Assistance, national number | X | ||||||
| Porsche workshop number | |||||||
| Production mode | X | X | X | ||||
| Tyre width | X | ||||||
| Tyre condition | X | ||||||
| Summer/winter time | X | X | |||||
| Time-out | X | ||||||
| Tuner parameters | X | X | |||||
| User data | X | ||||||
| Traffic broadcast loudspeaker boost | X | X | |||||
| Time | X | X | |||||
| Time zone | X | X |
CODING TABLE
Coding
It is possible to extract the PCM2 code and to code the PCM2 on a country-specific basis in the 'Modify coding' menu.
| Menu item | Function |
|---|---|
| PCM2 code | It is possible to code the PCM2 code under this menu item after replacing the PCM2. Connect and start the Porsche System Tester II No. 9588 and switch on the ignition. Select 'Cayenne' in the Vehicle type menu and confirm with the [>>] key. Select 'PCM2' in the Control units menu and confirm with the [>>] key. Select 'PCM2 MMI' in the Cayenne PCM2 function selection and confirm with the [>>] key. Select 'Coding' in the Cayenne PCM2 MMI function selection and confirm with the [>>] key. Select 'PCM2 code' in the Cayenne PCM2 MMI coding function selection and confirm with the [>>] key. Take the PCM2 code from 'IPAS', enter it and code it with the [F8] key. |
| Country coding | Using this menu item, you can code the country code. Connect and start the Porsche System Tester II No. 9588 and switch on the ignition. Select 'Cayenne' in the Vehicle type menu and confirm with the [>>] key. Select 'PCM2' in the Control units menu and confirm with the [>>] key. Select 'PCM2 MMI' in the Cayenne PCM2 function selection and confirm with the [>>] key. Select 'Coding' in the Cayenne PCM2 MMI function selection and confirm with the [>>] key. Select "Country coding" in the Cayenne PCM2 MMI coding function selection and confirm with the [>>] key. Select "the relevant country coding" from the menu item that is displayed and code it with the [F8] key. |
| Vehicle type vehicle coding | Using this menu item, you can code the relevant vehicle type. Connect and start the Porsche System Tester II No. 9588 and switch on the ignition. Select 'Cayenne' in the Vehicle type menu and confirm with the [>>] key. Select 'PCM2' in the Control units menu and confirm with the [>>] key. Select 'PCM2 MMI' in the Cayenne PCM2 function selection and confirm with the [>>] key. Select 'Coding' in the Cayenne PCM2 MMI function selection and confirm with the [>>] key. Select "Vehicle type vehicle coding" in the Cayenne PCM2 MMI coding function selection and confirm with the [>>] key. Select "the relevant vehicle type (Cayenne)" from the menu item that is displayed and code it with the [F8] key. The following selection is available: Not coded 911 (996) Boxster Cayenne |
| Vehicle version vehicle coding | Using this menu item, you can code the relevant vehicle version. Connect and start the Porsche System Tester II No. 9588 and switch on the ignition. Select 'Cayenne' in the Vehicle type menu and confirm with the [>>] key. Select 'PCM2' in the Control units menu and confirm with the [>>] key. Select 'PCM2 MMI' in the Cayenne PCM2 function selection and confirm with the [>>] key. Select 'Coding' in the Cayenne PCM2 MMI function selection and confirm with the [>>] key. Select 'Vehicle version vehicle coding' in the PCM2 MMI coding function selection and confirm with the [>>] key. Select 'Vehicle version vehicle coding' in the Cayenne PCM2 function selection and confirm with the [>>] key. Select "the relevant vehicle version" from the menu item that is displayed and code it with the [F8] key. The following selection is available: Not coded Coupe Caprio Targa |
| Air conditioning | Using this menu item, you can code the relevant equipment. Connect and start the Porsche System Tester II No. 9588 and switch on the ignition. Select 'Cayenne' in the Vehicle type menu and confirm with the [>>] key. Select 'PCM2' in the Control units menu and confirm with the [>>] key. Select 'PCM2 MMI' in the Cayenne PCM2 function selection and confirm with the [>>] key. Select 'Coding' in the Cayenne PCM2 MMI function selection and confirm with the [>>] key. Select 'Air conditioner' in the PCM2 MMI coding function selection and confirm with the [>>] key. Switch to the selection menu in the Cayenne PCM2 air conditioner function selection with the [>>] key. Select "the relevant version" from the menu item that is displayed and code it with the [F8] key. The following selection is available: With air conditioning Without air conditioning |
| Units | Using this menu item, you can code the relevant units. Connect and start the Porsche System Tester II No. 9588 and switch on the ignition. Select 'Cayenne' in the Vehicle type menu and confirm with the [>>] key. Select 'PCM2' in the Control units menu and confirm with the [>>] key. Select 'PCM2 MMI' in the Cayenne PCM2 function selection and confirm with the [>>] key. Select 'Coding' in the Cayenne PCM2 MMI function selection and confirm with the [>>] key. Select 'Units' in the Cayenne PCM2 MMI function selection and confirm with the [>>] key. Select 'Units' in the Cayenne PCM2 function selection and confirm with the [>>] key. Select "the relevant units" from the menu item that is displayed and code them with the [F8] key. The following selection is available: Metric, RoW (°C, litre, km) UK English (°C, gallon, mph) US English (°F, gallon, mph) |
| Right/left-hand drive vehicle coding | Using this menu item, you can code the relevant vehicle version. Connect and start the Porsche System Tester II No. 9588 and switch on the ignition. Select 'Cayenne' in the Vehicle type menu and confirm with the [>>] key. Select 'PCM2' in the Control units menu and confirm with the [>>] key. Select 'PCM2 MMI' in the Cayenne PCM2 function selection and confirm with the [>>] key. Select 'Coding' in the Cayenne PCM2 MMI function selection and confirm with the [>>] key. Select "Right/left-hand drive vehicle coding" in the Cayenne PCM2 MMI coding function selection and confirm with the [>>] key. Select "Right/ left-hand drive" from the menu item that is displayed and code it with the [F8] key. The following selection is available: Right-hand drive Left-hand drive |
| MOST switch | If the PCM2 is operated without additional MOST control units, the MOST switch must be closed. The MOST switch must only remain open when MOST control units are connected. Using this menu item, you can code the relevant vehicle version. Connect and start the Porsche System Tester II No. 9588 and switch on the ignition. Select 'Cayenne' in the Vehicle type menu and confirm with the [>>] key. Select 'PCM2' in the Control units menu and confirm with the [>>] key. Select 'PCM2 MMI' in the Cayenne PCM2 function selection and confirm with the [>>] key. Select 'Coding' in the Cayenne PCM2 MMI function selection and confirm with the [>>] key. Select "MOST switch open/closed" in the Cayenne PCM2 MMI coding function selection and confirm with the [>>] key. Select "MOST switch open/closed" from the menu item that is displayed and code with the [F8] key. The following selection is available: Open Closed |
MENU ITEMS AND FUNCTION REFERENCE CHART
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.
Gateway
The gateway is integrated in the PCM2/CDR23. Together with the MMI, it is a fixed component of each PCM2/CDR23. 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
Actual installed components list/required installed components list
All MOST control units that are connected to the PCM2 are entered in the 'required installed components list'. An actual installed components list is written and saved when the PCM2 is started.
Actual values
It is possible to read out the unlock counter under the 'Actual values' menu item.
| Menu item | Function |
|---|---|
| Unlock counter | 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. Connect and start the Porsche System Tester II No. 9588 and switch on the ignition. Select 'Cayenne' in the Vehicle type menu and confirm with the [>>] key. Select 'PCM2/CDR23' in the Control units menu and confirm with the [>>] key. Select 'PCM2 MMI' in the Cayenne PCM2 function selection and confirm with the [>>] key. Select 'Actual values' in the Cayenne PCM2 MMI function selection and confirm with the [>>] key. Select 'Unlock counter' in the PCM MMI actual values function selection and confirm with the [>>] key. Read out values from the display field. |
MENU ITEMS AND FUNCTION REFERENCE CHART
Lock/unlock
A lock occurs when the signal sent from the MMI via the wake-up/ring break diagnosis line is understood and answered by the connected MOST control units; 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 main board). It runs the gateway commands via the wake-up signal line and the distribution line diagnosis.
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. 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 units such as external amplifiers, CD changers, and/or telephone/telematics (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 units 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 unit is optically connected to the MOST. The MOST switch is opened when a light signal is received from the connected MOST control units.
Note. When the PCM2 is replaced, the coding must be performed in accordance with the connected MOST control units. When the 'Switch closed' parameter is set, the switch remains closed even in existing MOST control units. Communication is then not possible.
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.
Input signals
The following queries can be run using this menu item
- 3dB lowering
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 |
|---|---|
| 3dB lowering | 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 'Cayenne' in the Vehicle type menu and confirm with the Rt. arrow (->) key. Select 'PCM' in the control units selection and confirm with the [>>] key. Select 'PCM2/CDR23' in the control units selection and confirm with the [>>] key. Select 'PCM2 GW' in the PCM2 function selection and confirm with the [>>] key. Select the Input signals menu item and press the [>>] key. Select the "3dB lowering" menu item using the [>] key and press the [>>] key. Read out values from the display field. |
MENU ITEMS AND FUNCTION REFERENCE CHART
Single CD
The CD player is part of the PCM2. It is used to update the navigation system.
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.
PCM2 control unit (head unit)
The PCM2 control unit (head unit) includes the following components
Internal
PCM2 gateway
PCM2 Man Machine Interface (MMI)
Internal amplifier (optional, depending on the equipment)
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 unit 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
In an idle state, all control units that are connected to the PCM2 are in sleep mode. When the PCM2 is switched on, 'the light' which is reinforced by the connected MOST control units and forwarded is switched on via the gateway.
Possible cause of fault
- Battery voltage too low '< 9 V for > 30 sec'
- Battery voltage too high '> 16 V for > 30 sec'
- Check fuses (fuse in CD changer under the cover)
- Check battery
Note. The MOST optical waveguide is connected to the following control units: PCM2/CDR23 Optional external amplifier (BOSE) CD changer optional Telephone/telematics (only in conjunction with PCM2)
Affected pins
CD changer, plug A, pins 1 and 2
- CD changer faulty
Note. The MOST optical waveguide is connected to the following control modules: PCM2/CDR23 Optional external amplifier (BOSE) CD changer optional Telephone/telematics (only in conjunction with PCM2)
- CD changer faulty
- CD changer faulty
Note. The MOST optical waveguide is connected to the following control modules: PCM2/CDR23 Optional external amplifier (BOSE) CD changer optional Telephone/telematics (only in conjunction with PCM2)
- CD changer faulty
Note. The MOST optical waveguide is connected to the following control modules: PCM2/CDR23 (Optional) external BOSE amplifier. CD changer optional Telephone/telematics (only in conjunction with PCM2)
- CD changer faulty
- Magazine warped.
- CD changer faulty
Note. The MOST optical waveguide is connected to the following control modules: PCM2/CDR23 (Optional) external BOSE amplifier. CD changer optional Telephone/telematics (only in conjunction with PCM2)
- CD changer faulty
Note. The MOST optical waveguide is connected to the following control modules: PCM2/CDR23 (Optional) external BOSE amplifier. CD changer optional Telephone/telematics (only in conjunction with PCM2)
- CD changer faulty
Note. The MOST optical waveguide is connected to the following control modules: PCM2 or CDR23 CD changer Amplifier Telephone/telematics
- Magazine damaged or deformed
- CD changer faulty
Note. The MOST optical waveguide is connected to the following control modules: PCM2 or CDR23 CD changer External BOSE amplifier (optional) Telephone/telematics
- CD changer faulty
Note. The MOST optical waveguide is connected to the following control modules: PCM2 or CDR23 CD changer External BOSE amplifier (optional) Telephone/telematics
- CD changer faulty
- Memory problem in MOST control module
Note. The MOST optical waveguide is connected to the following control modules: PCM2 or CDR23 CD changer External BOSE amplifier Telephone/telematics (optional)