Home ReviewsRefund
Home/Porsche/Cayenne/Porsche Cayenne I (2002-2007)/Repair manual/Electronic Suspension/Offroad Stabilizers: Other
Contents Wiring diagrams Section: Electronic Suspension All sections

Offroad Stabilizers: Other Porsche Cayenne I

Electronic Suspension 8 illustrations ~1606 words

General instructions/safety instructions

In the following pages the 'offroad stabilizer control module' is also referred to as the 'ORS control module'.

The following points must be observed during vehicle diagnosis

  1. 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.
  2. After troubleshooting or repairs, erase the fault memory with the Porsche System Tester II No. 9588 and carry out a test drive.
  3. After the test drive, read out the fault memory with the Porsche System Tester II No. 9588 again.
WARNINGDanger! Danger of injury through triggering of driver's airbag Never hang the Porsche System Tester II No. 9588 over the steering wheel.
WARNINGDanger of injury and damage due to unusual vehicle handling when plugs or components are disconnected! Never disconnect plugs when the vehicle is in motion or drive the vehicle with plugs disconnected. Drive only with all parts fully installed and connected.
WARNINGDanger of personal injury from moving vehicle independently with gear engaged and engine running! Before starting the engine in a vehicle with manual transmission, take the vehicle out of gear and put the handbrake on firmly. Before starting the engine in a vehicle with automatic transmission, move the selector lever to position 'P' and put the handbrake on firmly.
WARNINGDanger of personal injury and material damage in case of incorrect use of hydraulic fluid and high fluid pressure Remove pressure from the hydraulic system before use. Refer to the corresponding regulations when handling hydraulic fluid.
CAUTIONDanger of damage due to improper handling of batteries and control module plug connections! Never disconnect battery with engine running Never start engine if battery terminal clamps are not connected securely Never pull off or push on plug connections for the control modules or other electronic components when the ignition is switched on. Always disconnect the negative terminal of the battery and pull off all plug connections to the vehicle electrical system control module when carrying out welding work on the vehicle

Fault code setting conditions

Fault codes can be set in several circumstances, e.g.

  1. battery disconnected
  2. plug connections disconnected
  3. faulty coding
  4. power failure
  5. etc.

In these circumstances, no fault is present in the system and the fault memory must be erased.

Possible causes of fault

Note. The 'possible causes of fault' that are responsible for the fault are listed here. Please note that in certain circumstances further faults can be stored in the fault memory after troubleshooting (e.g. if plugs are disconnected). After carrying out repairs, read out the fault memory of all control modules and erase any faults.

Fault type

The following fault types are possible

  1. upper limit value exceeded
  2. lower limit value not reached
  3. no signal/communication
  4. Short circuit to B+
  5. Short circuit to ground
  6. implausible signal
  7. open circuit/short circuit to ground
  8. Open circuit
  9. please read out fault memory
  10. faulty

Fault status

The following status types are possible

  1. present
  2. not present

This information should be saved using the Save key [F4] and printed out.

Note. Visual inspection: During troubleshooting, please check first that the affected pins on the wiring harness plug connection are neither damaged nor corroded. The wiring and plugs of the affected components must also be checked for external damage and correct contacts. Repair damaged or corroded pins if possible, otherwise replace affected pins. Repair or replace damaged wires.

Note. Battery voltage and signals: A battery voltage of between 11.4 and 14.5 V is required for troubleshooting. This must be checked and provided if necessary. Both signals and voltages as well as components or fuses (input side) must be guaranteed on the vehicle electrical system.

Note. Specified resistance values are based on an ambient temperature of 20°C.

Offroad stabilizer tools

WARNINGDanger of personal injury while driving with special tools Never hang the Porsche System Tester II No. 9588 over the steering wheel!

Note. Plug contacts are optimally designed to suit the plug system. Operations on pins can cause contact problems. Always use suitable measurement tools for adapter plugs and test cables.

Scheme 96

Scheme 96: Battery charging device
Scheme 96: Battery charging device

Scheme 97

Scheme 97: Porsche System Tester II No. 9588
Scheme 97: Porsche System Tester II No. 9588

Scheme 98

Scheme 98: Commercially available digital multimeter
Scheme 98: Commercially available digital multimeter

Scheme 99

Scheme 99: Measurement tool set No. 9684
Scheme 99: Measurement tool set No. 9684

Scheme 100

Scheme 100: Component arrangement, off-road stabilizers
Scheme 100: Component arrangement, off-road stabilizers

Component arrangement 'item 3': Button for hydraulically disengageable off-road stabilizers

Scheme 101

Scheme 101
Scheme 101

Scheme 102

Scheme 102: Connector assignment for offroad stabilizers
Scheme 102: Connector assignment for offroad stabilizers

Offroad stabilizer control module connector A

PinDesignationPinDesignation
1Terminal 302Pump motor +

CONNECTOR PINOUTS REFERENCE - OFFROAD STABILIZER CONTROL MODULE CONNECTOR A

Offroad stabilizer control module connector B

PinDesignationPinDesignation
1CAN drive (high)2VA sensor +
3CAN drive (low)4VA sensor
5Not used6Not used
7Terminal 158HA sensor
9VA sensor10Pressure sensor
11Signal pressure sensor12Button
13LED14Not used
15Not used16HA valve
17VA valve18Pressure sensor +
19HA valve +20VA valve +
21Not used22Terminal 30
23Terminal 3124

CONNECTOR PINOUTS REFERENCE - OFFROAD STABILIZER CONTROL MODULE CONNECTOR B

The off-road stabilizer control module includes the functions listed below

  1. Computer identification
  2. Computer configuration with ignition ON
  3. Checking the fault memory for fault entries, even in diagnostic mode
  4. Deleting the fault memory
  5. Reading measured values from switches and sensors

Supported functions

  1. Diagnosis software number
  2. Drive link test with active fault checking

Basic setting

  1. Initialisation
  2. Read memory
  3. Write memory
  4. Update programme
  5. Flash programme (end of volume)
  6. Protected against unauthorised access

Commissioning

When the ignition 'terminal 15' is switched on, an internal function test (initialisation phase) is performed in the off-road stabilizer control module. When the internal function test is completed successfully, all functions integrated in the off-road stabilizer control module are released.

Operating condition

The off-road stabilizer control module is in operating mode once the ignition is switched on and the internal function test is completed successfully. Within the defined limits for power supply and temperature, all incoming signals are processed by the integrated software and the appropriate monitoring and control processes are performed.

Data transfer

The off-road stabilizer control module sends and receives data/ information via the following 'CAN data bus'

  1. CAN drive (C)
  2. Gateway (in instrument cluster)

Fault memory

Faults that occur during operation are stored in a non-volatile memory (e.g. EEPROM). The faults remain in memory even if no voltage is present at terminals 15 and 30. The fault memory is designed in such a way that the occurring faults, data source, fault type and fault deletion counter can be saved. The off-road stabilizer control module sends messages and checks the CAN drive cyclically for messages from other control modules. If no messages are received for a certain time period, a fault is stored in the fault memory.

Drive links

The following drive links can be selected individually in the Off-road stabilizers system using the 9588 Porsche System Tester II in the drive link test.

  1. Set front-axle valve 'to depressurise front system'
  2. Set rear-axle valve 'to depressurise rear system'
  3. Switch on electric hydraulic pump 'to bleed the system'
  4. Switch on front-axle valve 'to check the front system'
  5. Switch on rear-axle valve 'to check the rear system'
  6. Switch on front-axle and rear-axle valves in turn 'to completely disengage the system manually'
Fault codeFault textFault effect
0003Control unit faultyNo system function
0456KESSY control module (CAN drive)No system function
0576Terminal 15No system function
0598Hydraulic / mechanical faultNo/limited system function
0926Terminal 30No system function
1042Control module not codedNo system function
1312CAN driveNo system function
1316PSM control moduleNo system function
1324Transfer box control moduleNo system function
2548VA sensorNo/limited system function
2549HA sensorNo/limited system function
2550Hydraulic unit pressure sensorNo system function
2551ButtonNo system function
2552LED in buttonNo/limited system function
2553VA valveNo/limited system function
2554HA valveNo/limited system function
2555El. hydraulic pumpNo system function
2556Hydraulic pump voltage supplyNo system function

FAULT REVIEW FOR OFFROAD STABILIZERS

Possible cause of fault

  1. Incorrect vehicle type selected in 9588 Porsche System Tester II
  2. 9588 Porsche System Tester II is not connected correctly or is faulty
  3. Power supply of 'off-road stabilizer control module' is not OK
  4. 'Gateway' in instrument cluster does not function
  5. 'CAN drive' does not function
  6. 'Off-road stabilizer control module' does not function

Affected pins

Off-road stabilizer control module, plug A

  1. Pin 1 'terminal 30 voltage (electric hydraulic pump) via fuse F14 in back-up fuse holder'

Off-road stabilizer control module, plug B

  1. Pin 7 'terminal 15 voltage via fuse F49 in fuse carrier at left of dashboard'
  2. Pin 22 'terminal 30 voltage via fuse F23 in fuse carrier at left of dashboard'
  3. Pin 23 'ground for body ground point 41'
  4. Pin 1 'CAN drive (high)'
  5. Pin 3 'CAN drive (low)'
  1. Defective offroad stabilizer control module
  1. No signal/communication (no signal from KESSY control module on CAN drive)

Offroad stabilizer control module connector B

  1. Pin 1 'CAN drive (high)'
  2. Pin 3 'CAN drive (low)'
  1. Short circuit to B+
  2. Short circuit to ground
  3. Open circuit in wiring
  4. Fuse 'F49' (5A) in fuse carrier at left of dashboard faulty
  5. Relay for terminal 15 under driver's seat faulty
  6. ORS control module faulty

Offroad stabilizer control module connector B

  1. Pin 7 'terminal 15'
  1. No or not enough pressure is built up although the hydraulic pump is running
  2. Hydraulic pump does not start
  3. Hydraulic/mechanical fault

ORS control module, plug A

  1. Pin 2 'pump motor +'
  1. Upper limit value exceeded (battery positive voltage too high)
  2. Lower limit value not reached (battery voltage too low)
  3. Fuse 'F23' (10A) in fuse carrier at left of dashboard faulty

ORS control module, plug B

  1. Pin 22 'terminal 30'

Fuse in fuse carrier at left of dashboard: 'F23' (10A)

  1. No or incorrect basic setting (no coding written in off-road stabilizer control module)

Note. This fault code is only issued if a new, 'uncoded' control module was installed, which does not yet contain any coding.

Communication problem with all control modules via CAN drive.

  1. Short circuit to ground
  2. Short circuit to B+
  3. Break in wiring harness

Offroad stabilizer control module connector B

  1. Pin 1 'CAN drive (high)'
  2. Pin 3 'CAN drive (low)'
  1. No signal/communication (no signal from PSM control module on CAN drive)
  2. Faulty PSM control module
  3. Read out PSM control module fault memory

Offroad stabilizer control module connector B

  1. Pin 1 'CAN drive (high)'
  2. Pin 3 'CAN drive (low)'
  1. No signal/communication (no signal from transfer box control module on CAN drive)
  2. Read out fault memory in transfer box control module

Offroad stabilizer control module connector B

  1. Pin 1 'CAN drive (high)'
  2. Pin 3 'CAN drive (low)'
  1. Short circuit to B+
  2. Short circuit to ground
  3. Open circuit in wiring
  4. Implausible signal

Offroad stabilizer control unit, connector B

  1. Pin 2 'front-axle sensor +'
  2. Pin 3 'front-axle sensor -'
  1. Short circuit to B+
  2. Short circuit to ground
  3. Open circuit in wiring
  4. Implausible signal

Offroad stabilizer control unit, connector B

  1. Pin 4 'rear-axle sensor +'
  2. Pin 8 'rear-axle sensor -'
  1. Short circuit to B+
  2. Short circuit to ground
  3. Open circuit in wiring
  4. Pressure sensor faulty

Off-road stabilizer control module, plug B

  1. Pin 10 'pressure sensor -' for hydraulic unit plug B pin 10 'pressure sensor -'
  2. Pin 11 'pressure sensor signal' for hydraulic unit plug B pin 7 'pressure sensor signal'
  3. Pin 18 'pressure sensor +' for hydraulic unit plug B pin 3 'pressure sensor +'

Scheme 103

Scheme 103: Voltage range
Scheme 103: Voltage range

[bar]- Pressure

[V] - Voltage

Fault code 2551

Note. This fault code is entered when the button is actuated for more than 30 seconds.

  1. Implausible signal

Off-road stabilizer control module, plug B

  1. Pin 12 'button'
  1. Short circuit to B+
  2. Short circuit to ground
  3. Open circuit in wiring

Off-road stabilizer control module, plug B

  1. Pin 13 'LED-'
  1. Short circuit to B+
  2. Short circuit to ground
  3. Open circuit in wiring
  4. Implausible signal

Offroad stabilizer control module connector B

  1. Pin 17 'VA valve -' to hydraulic unit plug A pin 6 'valve -'
  2. Pin 20 'VA valve +' to hydraulic unit plug A pin 5 'valve +'
  1. Short circuit to B+
  2. Short circuit to ground
  3. Open circuit in wiring
  4. Implausible signal

Offroad stabilizer control module connector B

  1. Pin 16 'HA valve -' to hydraulic unit plug A pin 2 'HA valve -'
  2. Pin 19 'HA valve +' to hydraulic unit plug A pin 1 'HA valve +'
  1. Short circuit to ground
  2. Open circuit in wiring
  3. el. hydraulic pump faulty

Offroad stabilizer control module connector A

  1. Pin 2 'Pump motor +' to hydraulic unit plug A pin 3 'Pump motor +'
  1. Open circuit in wiring

Off-road stabilizer control module, plug A

  1. Pin 1 'terminal 30'
  2. Pin 2 'pump motor +'

More articles — Offroad Stabilizers