Additional Heating Porsche Cayenne S I рестайлинг

Auxiliary heater introduction

Note. The following troubleshooting diagnosis has been geared only towards left-hand drive vehicles and describes only these types of vehicles. In some cases, specified plugs and sockets may be assigned differently in right-hand drive vehicles, which can lead to incorrect interpretations during troubleshooting and to unforeseen accidents. Therefore, no work should be performed on right-hand drive vehicles without the correct wiring diagram and troubleshooting diagnosis description.

Auxiliary heater diagnosis software number: 0101

Cayenne as of model year 2003

General instructions/safety instructions

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 9588 Porsche System Tester II and carry out a test drive.
3. After the test drive, read out the fault memory with the 9588 Porsche System Tester II again.

1. When operating auxiliary heater in fire and explosion endangered areas.
2. When working on the fuel system, the respective applicable safety regulations must be observed.

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.

Troubleshooting procedure

Troubleshooting can only be performed when the fault is present. In other words, specific troubleshooting can only be performed in accordance with instructions (given under Diagnosis/troubleshooting for each fault code) if the entry has the status 'present' in the fault memory.

If the fault is currently 'not present', please check the following

1. Diagnosis conditions are met; if necessary perform a short test or test drive
2. All plug connections and ground points of the affected current path are OK.
3. Set all wiring harnesses of the affected current path to a state that corresponds to driving by pulling and shaking them (loose contact)

Diagnostic conditions

Note. Important! Always connect a suitable battery charging device to the vehicle electrical system battery or to the designated jump-start terminal before starting diagnosis. All unnecessary loads must also be switched off.

Note. The fault can only be identified if the requirements listed under 'Diagnostic conditions' are met. For this reason, the specified procedure must be observed after a fault is repaired: Erase fault memory. Satisfy the requirements listed under 'Diagnostic conditions'. Read out fault memory again

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.

Diagnosis/troubleshooting

Note. The fault memory Info key [F8] on 9588 Porsche System Tester II can be used to access the 'extended fault memory'. The following information can be displayed

Note. The auxiliary heater control module is locked if the same fault has happened 3 times or 5 different faults have happened in succession.

Fault type

The following fault types are possible

1. no display
2. upper limit value exceeded
3. lower limit value not reached
4. no signal/communication
5. short circuit to B+
6. short circuit to ground
7. implausible signal
8. open circuit/short circuit to ground
9. open circuit/short circuit to B+
10. open circuit
11. electrical fault in electric circuit
12. please read out fault memory
13. 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.

Auxiliary heater tools

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

Identifying Battery Charging Device. Scheme 1

Identifying Porsche System Tester II (9588). Scheme 2

Identifying Commercially Available Digital Multimeter. Scheme 3

Identifying Measurement Tool Set (9684). Scheme 4

Identifying Auxiliary Heater Component Arrangement. Scheme 5

Wiring harness plug A auxiliary heater

PLUG A AUXILIARY HEATER TERMINALS REFERENCE

Wiring harness plug B auxiliary heater

PLUG A AUXILIARY HEATER TERMINALS REFERENCE

Auxiliary heater fault overview

FAULT REFERENCE CHART

1. Ignition on
2. Internal auxiliary heater control unit function test

Possible cause of fault

1. Auxiliary heater control unit faulty

DIAGNOSIS TROUBLESHOOTING PROCEDURE

1. Ignition on
2. Battery positive voltage 9.76 V - 15 V
3. Internal auxiliary heater control unit function test

1. Open circuit in CAN Infotainment (no signal/communication)
2. Auxiliary heater control unit faulty

Affected pins

Plug A for auxiliary heater control unit

1. Pin 2 'CAN Infotainment (high)'
2. Pin 3 'CAN Infotainment (low)'

Note. Visual inspection: During the next check, first ensure that the affected pins of the 14-pin plug connection on the wiring harness are neither damaged nor corroded. Remove any soiling or corrosion/oxidation. Replace damaged parts/wires.

DIAGNOSIS TROUBLESHOOTING PROCEDURE

1. Ignition on
2. Fuel supply warning light on
3. Internal auxiliary heater control unit function test

1. Fuel quantity in vehicle tank on Reserve (< 12 litres)
2. Open circuit in CAN Infotainment (no signal/communication)
3. Auxiliary heater control unit faulty

Plug A for auxiliary heater control unit

1. Pin 2 'CAN Infotainment (high)'
2. Pin 3 'CAN Infotainment (low)'

Note. Visual inspection: During the next check, first ensure that the affected pins of the 14-pin plug connection on the wiring harness are neither damaged nor corroded. Remove any soiling or corrosion/oxidation. Replace damaged parts/wires.

DIAGNOSIS TROUBLESHOOTING PROCEDURE

1. Ignition on
2. Internal auxiliary heater control unit function test

1. Open circuit in CAN Infotainment (no signal/communication)
2. Implausible signal
3. Electrical fault in electric circuit (plug contact problem)
4. Auxiliary heater control unit faulty

Plug A for auxiliary heater control unit

1. Pin 2 'CAN Infotainment (high)'
2. Pin 3 'CAN Infotainment (low)'

Note. Visual inspection: During the next check, first ensure that the affected pins of the 14-pin plug connection on the wiring harness are neither damaged nor corroded. Remove any soiling or corrosion/oxidation. Replace damaged parts/wires.

DIAGNOSIS TROUBLESHOOTING PROCEDURE

1. Engine on
2. Internal auxiliary heater control unit function test

1. Above upper limit (vehicle electrical system voltage, terminal 30 with engine running over 15.8 V)
2. Auxiliary heater control unit faulty

Plug B for auxiliary heater control unit

1. Pin 1 'terminal 30'
2. Pin 2 'terminal 31'

Note. Visual inspection: During the next check, first ensure that the affected pins of the 14-pin plug connection on the wiring harness are neither damaged nor corroded. Remove any soiling or corrosion/oxidation. Replace damaged parts/wires.

Note. Battery voltage: A battery voltage of between 11.4 and 14.5 V is required for the following troubleshooting procedure. This must be checked and provided, if necessary. On the vehicle electrical system, the voltage to the fuse (input side) must be guaranteed.

DIAGNOSIS TROUBLESHOOTING PROCEDURE

1. Ignition on
2. Internal auxiliary heater control unit function test

1. Open circuit in CAN Infotainment (no signal/communication)
2. Implausible signal
3. Electrical fault in electric circuit (plug contact problem)
4. Auxiliary heater control unit faulty

Plug A for auxiliary heater control unit

1. Pin 2 'CAN Infotainment (high)'
2. Pin 3 'CAN Infotainment (low)'

Note. Visual inspection: During the next check, first ensure that the affected pins of the 14-pin plug connection on the wiring harness are neither damaged nor corroded. Remove any soiling or corrosion/oxidation. Replace damaged parts/wires.

DIAGNOSIS TROUBLESHOOTING PROCEDURE

1. Ignition on
2. Internal auxiliary heater control unit function test

1. Electrical fault in electric circuit (plug contact problem)
2. Short circuit to ground
3. Short circuit to B+
4. Open circuit in wiring
5. Auxiliary heater control unit faulty

Plug A for auxiliary heater control unit

1. Pin 4 '3/2-way valve output'

Plug on 3/2-way valve

1. Pin 1 '3/2-way valve input'
2. Pin 2 'terminal 31'

Note. Visual inspection: During the next check, first ensure that the affected pins of the 14-pin plug connection on the wiring harness are neither damaged nor corroded. Remove any soiling or corrosion/oxidation. Replace damaged parts/wires.

DIAGNOSIS TROUBLESHOOTING PROCEDURE

1. Ignition on
2. Internal auxiliary heater control unit function test

Communication problem with the Gateway control unit.

1. No signal/communication

Plug A for auxiliary heater control unit

1. Pin 2 'CAN Infotainment (high)'
2. Pin 3 'CAN Infotainment (low)'

Note. If there is no incoming signal/message via the CAN Infotainment using several control modules, the CAN Infotainment must be checked for open or short circuits. Refer to ' CHECKING INSTRUCTIONS/CAN DATA BUS '.

DIAGNOSIS TROUBLESHOOTING PROCEDURE

1. Ignition on
2. Internal auxiliary heater control unit function test

1. Open circuit in CAN Infotainment (no signal/communication)
2. Electrical fault in electric circuit (plug contact problem)
3. Auxiliary heater control unit faulty

Plug A for auxiliary heater control unit

1. Pin 2 'CAN Infotainment (high)'
2. Pin 3 'CAN Infotainment (low)'

Note. Visual inspection: During the next check, first ensure that the affected pins of the 14-pin plug connection on the wiring harness are neither damaged nor corroded. Remove any soiling or corrosion/oxidation. Replace damaged parts/wires.

DIAGNOSIS TROUBLESHOOTING PROCEDURE

1. Ignition on
2. Internal auxiliary heater control unit function test

Communication problem with all control modules via CAN Infotainment.

1. CAN Infotainment is faulty
2. No signal/communication

Plug A for auxiliary heater control unit

1. Pin 2 'CAN Infotainment (high)'
2. Pin 3 'CAN Infotainment (low)'

Note. If there is no incoming signal/message via the CAN Infotainment using several control modules, the CAN Infotainment must be checked for open or short circuits. Refer to ' CHECKING INSTRUCTIONS/CAN DATA BUS '.

DIAGNOSIS TROUBLESHOOTING PROCEDURE

1. Ignition on
2. Internal auxiliary heater control unit function test

1. Electrical fault in electric circuit (plug contact problem)
2. Fuel deficiency (e.g. when the auxiliary heater was not switched on for a longer period)
3. Fuel lines leak (before or after the metering pump)
4. Interruption in fuel lines
5. Metering pump does not function

Note. Visual inspection: During the next check, first ensure that the affected pins of the 14-pin connector on the wiring harness are neither damaged nor corroded. Remove any soiling or corrosion/oxidation. Replace damaged parts/wiring.

Note. The fuel supply of the auxiliary heater or metering pump must be ensured.

Note. Coolant temperature must be < 60 °C (140 °F) before the test!

DIAGNOSIS TROUBLESHOOTING PROCEDURE

1. Ignition on
2. Internal auxiliary heater control unit function test

1. Electrical fault in electric circuit (plug contact problem)
2. Fuel lines leak (before or after the metering pump)
3. Interruption in fuel lines
4. Flame monitor does not function
5. Fuel tank fuel level at reserve

Note. Visual inspection: During the next check, first ensure that the affected pins of the 14-pin connector on the wiring harness are neither damaged nor corroded. Remove any soiling or corrosion/oxidation. Replace damaged parts/wiring.

Note. The fuel supply of the auxiliary heater or metering pump must be ensured.

Note. Coolant temperature must be < 60 °C (140 °F) before the test!

DIAGNOSIS TROUBLESHOOTING PROCEDURE

Undervoltage cutout (internal)

Note. The 'internal' threshold can be modified using the 9588 Porsche System Tester II in the 'Coding' menu item under 'Threshold'.

Note. Using the 9588 Porsche System Tester II, the menu item 'Coding' under 'Undervoltage cutout' can be switched to the value 'external' (12.2 V).

1. Ignition on
2. Internal auxiliary heater control unit function test

1. Voltage limit value not reached (< 9.6 V)
2. Electrical fault in electric circuit (plug contact problem)
3. Open circuit in wiring
4. Auxiliary heater control unit faulty

Connector B

1. Pin 1 'terminal 30'
2. Pin 2 'terminal 31'

Note. Visual inspection: In the next troubleshooting section, please check first that the affected fuses are not faulty. Replace faulty fuse(s) and determine and remedy the cause according to troubleshooting instructions. The affected 'pins' on the auxiliary heater control unit plug connection must be neither damaged nor corroded. The wiring of the affected components must also be checked for external damage. Repair damaged or corroded 'pins' if possible, otherwise replace affected 'pins'. Repair damaged wire or replace.

DIAGNOSIS TROUBLESHOOTING PROCEDURE

1. Ignition on
2. Internal auxiliary heater control unit function test

1. Electrical fault in electric circuit (plug contact problem)
2. Fuel lines leak (before or after the metering pump)
3. Interruption in fuel lines
4. Auxiliary heater control unit faulty

Note. Visual inspection: During the next check, first ensure that the affected pins of the 14-pin connector on the wiring harness are neither damaged nor corroded. Remove any soiling or corrosion/oxidation. Replace damaged parts/wiring.

Note. The fuel supply of the auxiliary heater or metering pump must be ensured.

Note. Coolant temperature must be < 60 °C (140 °F) before the test!

DIAGNOSIS TROUBLESHOOTING PROCEDURE

1. Ignition on
2. Internal auxiliary heater control unit function test

1. Upper temperature limit value exceeded (>88°C (190°F))
2. Circulating pump faulty
3. Water temperature sensor faulty
4. Auxiliary heater control unit faulty

Note. Coolant temperature must be < 60 °C (140 °F) before the test!

DIAGNOSIS TROUBLESHOOTING PROCEDURE

1. Ignition on
2. Internal auxiliary heater control unit function test

1. Implausible signal
2. Glow pin faulty
3. Auxiliary heater control unit faulty

DIAGNOSIS TROUBLESHOOTING PROCEDURE

1. Ignition on
2. Internal auxiliary heater control unit function test

1. Electrical fault in electric circuit (plug contact problem)
2. Short circuit to ground
3. Short circuit to B+
4. Open circuit in wiring
5. Auxiliary heater control unit faulty

Plug A for auxiliary heater control unit

1. Pin 6 'output for metering pump'

Metering pump plug

1. Pin 2 'input for metering pump'
2. Pin 1 'terminal 31'

Note. Visual inspection: During the next check, first ensure that the affected pins of the 14-pin plug connection on the wiring harness are neither damaged nor corroded. Remove any soiling or corrosion/oxidation. Replace damaged parts/wires.

DIAGNOSIS TROUBLESHOOTING PROCEDURE

1. Ignition on
2. Internal auxiliary heater control unit function test

1. Line from air filter to combustion air blower blocked
2. Short circuit to ground
3. Short circuit to B+
4. Open circuit in wiring
5. Auxiliary heater control unit faulty

DIAGNOSIS TROUBLESHOOTING PROCEDURE

1. Ignition on
2. Internal auxiliary heater control unit function test

1. Electrical fault in electric circuit (plug contact problem)
2. Open circuit in wiring
3. Auxiliary heater control unit faulty

Note. Visual inspection: During the next check, first ensure that the affected pins of the 14-pin plug connection on the wiring harness are neither damaged nor corroded. Remove any soiling or corrosion/oxidation. Replace damaged parts/wires.

DIAGNOSIS TROUBLESHOOTING PROCEDURE

Undervoltage cutout (external)

Note. Using the 9588 Porsche System Tester II, the menu item 'Coding' under 'Undervoltage cutout' can be switched to the value 'internal'.

1. Ignition on
2. Internal auxiliary heater control unit function test

1. Lower limit value (< 11.6 V) not reached via CAN Infotainment
2. Auxiliary heater control unit faulty

DIAGNOSIS TROUBLESHOOTING PROCEDURE

1. Ignition on
2. Internal auxiliary heater control unit function test

1. Upper limit value exceeded (>4.8V)
2. Open circuit in wiring (<0.16V)
3. Auxiliary heater control unit faulty

DIAGNOSIS TROUBLESHOOTING PROCEDURE

1. Ignition on
2. Internal auxiliary heater control unit function test

1. Electrical fault in electric circuit (plug contact problem)
2. Short circuit to ground
3. Short circuit to B+
4. Open circuit in wiring
5. Auxiliary heater control unit faulty

DIAGNOSIS TROUBLESHOOTING PROCEDURE

1. Ignition on
2. Internal auxiliary heater control unit function test

1. Coding of engine version in auxiliary heater control unit does not correspond to coding via CAN Infotainment or gateway.
2. Auxiliary heater control unit faulty

DIAGNOSIS TROUBLESHOOTING PROCEDURE

1. Ignition on
2. Internal auxiliary heater control unit function test

1. Open circuit from radio remote control receiver to auxiliary heater control unit
2. Implausible signal
3. Electrical fault in electric circuit (plug contact problem)
4. Hand-held transmitter faulty
5. Antenna faulty
6. Receiver faulty
7. Auxiliary heater control unit faulty

Plug A radio remote control receiver

1. Pin 2 'output for radio remote control receiver'

Plug A for auxiliary heater control unit

1. Pin 1 'input for auxiliary heater control unit'

Note. Visual inspection: During the next check, first ensure that the affected pins of the 14-pin plug connection on the wiring harness are neither damaged nor corroded. Remove any soiling or corrosion/oxidation. Replace damaged parts/wires.

DIAGNOSIS TROUBLESHOOTING PROCEDURE

1. Ignition on
2. Internal auxiliary heater control unit function test

1. No display in air-conditioning control unit display
2. The same fault has happened 3 times or 5 different faults have happened in succession
3. Auxiliary heater control unit faulty

Note. Visual inspection: During the next check, first ensure that the affected pins of the 14-pin connector on the wiring harness are neither damaged nor corroded. Remove any soiling or corrosion/oxidation. Replace damaged parts/wiring.

Note. Depending on the fault codes entered in the 'fault memory' of the 9588 Porsche System tester II, check the fuel supply, the coolant circuit, or the air intake.

Note. Coolant temperature must be < 60 °C (140 °F) before the test!

DIAGNOSIS TROUBLESHOOTING PROCEDURE

1. Ignition on
2. Internal auxiliary heater control unit function test

1. After voltage interruption and recurrent voltage
2. Auxiliary heater control unit faulty

Note. Visual inspection: During the next check, first ensure that the affected pins of the 14-pin plug connection on the wiring harness are neither damaged nor corroded. Remove any soiling or corrosion/oxidation. Replace damaged parts/wires.

DIAGNOSIS TROUBLESHOOTING PROCEDURE

Poses Online

See also:
• CHECKING INSTRUCTIONS/CAN DATA BUS