Air Conditioning - Diagnostics Porsche Cayenne S I

Introduction

Note. The following document was created for manual air-conditioning, automatic 2-zone air-conditioning and automatic 4-zone air-conditioning systems.

Distinguishing characteristics

The various air-conditioning systems can be distinguished from one another via the diagnosis software number in the PST 2 menu option 'Identification' as follows.

1. The diagnosis software number 01xx stands for 2-zone air-conditioning.
2. The diagnosis software number 02xx stands for 4-zone air-conditioning.
3. The diagnosis software number 03xx stands for manual air-conditioning.

The 3rd and 4th characters identify the software version for the corresponding air-conditioning system.

General instructions/safety instructions

Note. Communication with the air-conditioning system regulator control module can only be established once the ignition is switched on. The fault memory of the air-conditioning system regulator control module must be read out before troubleshooting.

Troubleshooting procedure

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. Diagnostic conditions are met.
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.

Diagnostic conditions

Note. Important Always connect a suitable battery charging device to the vehicle electrical system battery 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

1. Clear fault memory.
2. Satisfy the requirements listed under 'Diagnostic conditions'.
3. 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

Fault type

The following fault types are possible

1. No display
2. Upper limit value exceeded
3. Lower limit value not reached
4. Mechanical fault
5. No signal/communication
6. No or incorrect basic setting/adaptation
7. Short circuit to B+
8. Short circuit to ground
9. Implausible signal
10. Open circuit/short circuit to ground
11. Open circuit/short circuit to B+
12. Electrical fault in electric circuit
13. Please read out fault memory
14. 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 plug connection of the air-conditioning system regulator control module 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: A battery voltage of between 11.4 and 14.5 V is required for troubleshooting. This must be checked and provided if necessary. Voltages as well as components or fuses (input side) must be guaranteed on the vehicle electrical system.

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 cables.

Scheme 518

Scheme 519

Scheme 520

Scheme 521

9721 Test cable

Used for troubleshooting servo motors.

Scheme 522

Scheme 523

1. Air-conditioning compressor
2. Pressure sensor
3. Air conditioning unit
4. Air-conditioning system regulator control module

Scheme 524

1. Air-conditioning compressor
2. Pressure sensor
3. Air conditioning unit
4. Air-conditioning system regulator control module
5. Sun sensor

Scheme 525

1. Air-conditioning compressor
2. Pressure sensor
3. Front air conditioning unit
4. Front air-conditioning system regulator control module
5. Sun sensor
6. B-pillar servo motors, left and right
7. Servo motors for passenger blower, rear left and right tunnel
8. Air-conditioning system regulator control module, rear
9. Control module for rear seat heating
10. Rear left and right blower outlet sensor
11. Rear air conditioning unit

Scheme 526

Socket A (black), 24-pin (2-zone and 4-zone air conditioning)

CONNECTOR PIN TERMINAL REFERENCE CHART

Socket A, (black) 24-pin (manual air conditioning)

CONNECTOR PIN TERMINAL REFERENCE CHART

Socket B, (red) 24-pin (4-zone air conditioning)

CONNECTOR PIN TERMINAL REFERENCE CHART

Socket C (yellow), 24-pin (2-zone and 4-zone air conditioning)

CONNECTOR PIN TERMINAL REFERENCE CHART

Socket C, (yellow) 24-pin (manual air conditioning)

CONNECTOR PIN TERMINAL REFERENCE CHART

Socket E (black), 12-pin (manual, 2-zone and 4-zone air conditioning)

CONNECTOR PIN TERMINAL REFERENCE CHART

Scheme 527

Socket B, (red) 20-pin (4-zone air conditioning)

CONNECTOR PIN TERMINAL REFERENCE CHART

Socket C, (yellow) 16-pin (4-zone air conditioning)

CONNECTOR PIN TERMINAL REFERENCE CHART

Socket D, (black) 16-pin (4-zone air conditioning)

CONNECTOR PIN TERMINAL REFERENCE CHART

Required status of recirculation valve

1. For 2-zone and 4-zone air conditioning systems only!

In the menu item 'Actual values', the current required position of the recirculation valve can be read out. Numbers from '0' to '8' are output. The meaning of each number is shown in the following table.

RECIRCULATION VALVE REFERENCE CHART

Compressor OFF code

In menu item 'Inputs signals', the actual reason for compressor shutdown can be read out. Numbers from '1' to '23' are output. The meaning of each number is shown in the following table.

Note. If the compressor is switched on, the display shows the number '15' or the text 'comp. ON'!

AIR CONDITION COMPRESSOR REFERENCE CHART

Drive links

In menu item 'Drive links', both a 'self test' (system check) and a test of individual drive links can be performed.

Note. The vehicle engine must not be running! The air conditioning system regulator(s) must not be 'OFF'! The engine coolant should be at operating temperature!

Note. The waiting time until a particular position is set is approx. 5 seconds. Only then can the next step take place!

1. Manual, 2-zone and 4-zone air conditioning systems!
2. For the 'self test', the blower(s) is/are first set at 1/2 power. All valves are then driven to the CLOSED position. The blower(s) is/ are then set at full power. Finally, all valves are driven to the OPEN position. The procedure lasts about 20 seconds.
3. After the 'self test' the individual front valves are checked.
4. For checking the individual valves, the front blower is set at 3/4 power.
5. The valve under test is driven to the OPEN and CLOSED stops with a 5-second cycle time.
6. All other valves are driven to the CLOSED position.
7. Only the 'passenger blower valve' corresponding to the front 'temperature valves' is driven to the OPEN stop.
8. After activating the front valves, the front 'blower regulator' is set to steps 1/4, 1/2, full and zero power.
9. For this procedure, the front 'passenger blower valve' is driven to the OPEN stop, all other valves being driven to the CLOSED stop.
10. After activating the front 'blower regulator', the 'coolant pump' is activated.
11. For 4-zone air conditioning system only!
12. After the 'coolant pump', the individual valves at the rear are checked.
13. For checking the individual valves, the rear blower is set at 3/4 power.
14. The valve under test is driven to the OPEN and CLOSED stops with a 5-second cycle time.
15. All other valves are driven to the CLOSED position.
16. Only the 'air flow valve' corresponding to the rear 'temperature valves' is driven to the OPEN stop.
17. For all valves except the two 'B-pillar valves' themselves, the respective 'B-pillar valve' is driven to the B-pillar stop.
18. After activating the rear valves, the rear 'blower regulator' is set to steps 1/4, 1/2, full and zero power.
19. For this procedure, the 'air-flow valve' and the right 'B-pillar valve' are driven to the OPEN stop, all other valves being driven to the CLOSED stop.

Note. Before and after the drive link test, the fault memory must be evaluated!

1. Using the 9588 Porsche System Tester II, select the menu item 'Drive links'.
2. Switch on air conditioning system(s) and press: button. NOTE: The drive link check can be aborted at any time with the [<<] button! Checking of individual drive links can be terminated at any time with the [F8] 'Stop' button!
3. Press [F8] 'Start' to begin the drive link check.
4. Press [F8] 'Start' once more to perform the 'self test' of the air-conditioning system regulator. NOTE: The procedure lasts about 20 seconds and ends automatically. All subsequent drive link activations must be terminated with the [F8] 'Stop' button!
5. Press the [F8] 'Start' button again to activate the next drive link of the air-conditioning system regulator.
6. When the drive link test has run fully through, press the [F8] 'Start' button to repeat it or the [<<] button to end.

Coding

In menu point 'Coding', either 'heat-absorbing glazing' or 'standard glazing' can be coded to suit the vehicle!

Note. The vehicle engine must not be running! The air conditioning system regulator(s) must not be 'OFF'!

Calibration

In menu point 'Calibration', the end stops of all valves can be taught!

Note. The vehicle engine must not be running! The air conditioning system regulator(s) must not be 'OFF'!

Servicing position

In the menu point 'Service position', the valves can be driven to a defined position for repair!

Note. The vehicle engine must not be running! The air conditioning system regulator(s) must not be 'OFF'!

Fault overview

FAULT CODE CHART

Troubleshooting with no control module connected

Note. 9588 Porsche System Tester II and the 'air-conditioning system regulator control module' are not connected.

1. Ignition on
2. The fuses of the 'air-conditioning system regulator control module' are OK
3. The fuses of the 'gateway control module' in the instrument cluster are OK
4. Battery voltage is OK '(11.4-14.4 V)'
5. Plug on 'gateway control module' fitted correctly
6. Plug on 'air-conditioning system regulator control module' fitted correctly

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 to the 'air-conditioning system regulator control module' is not OK
4. Power supply to the 'gateway control module' is not OK
5. 'K' lead' from diagnostic box to 'gateway control module' in instrument cluster does not function
6. 'Gateway' in instrument cluster does not function
7. 'CAN comfort (B)' does not function
8. 'Air-conditioning system regulator control module' does not function

Affected pins

Diagnostic box

1. Pin 1 'Power supply terminal 15/fuse carrier at left of dashboard, F 51)'
2. Pin 3'K' lead'
3. Pin 4 'Ground terminal 31'
4. Pin 5 'Ground terminal 31'

Plug 'E' on front air-conditioning system regulator control module

1. Pin 5 'Power supply terminal 30a/fuse carrier at right of dashboard, F 23)'
2. Pin 9 'Ground input (terminal 31) MB 22'
3. Pin 10 'Ground input (terminal 31) MB 22'

Plug 'C on front air-conditioning system regulator control module

1. Pin 17' CAN comfort high'
2. Pin 18 'CAN comfort low'

Scheme 528

CONNECTOR PIN TERMINAL REFERENCE CHART

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Power supply for air-conditioning system regulator control module, OK
4. Internal function test completed on air-conditioning system regulator control module

1. Front air-conditioning system regulator control module faulty (manual, 2-zone and 4-zone air conditioning)
2. Rear air-conditioning system regulator control module faulty (4-zone air conditioning)

1. 4-zone air conditioning system

DIAGNOSIS/TROUBLESHOOTING CHART

1. Manual and 2-zone air conditioning systems

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control module

1. No or incorrect basic setting
2. Short circuit to ground
3. Open circuit/short circuit to B+
4. Servo motor flap stiff
5. Servo motor faulty
6. Front air-conditioning system regulator faulty

Front air-conditioning system regulator control module: Plugs A and E

1. Plug A: Pin 10 Temp, sensor signal (signal for evaporator temperature sensor)'
2. Plug E: Pin 12 'Ground sensor'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on rear air-conditioning system regulator control module

1. Short circuit to B+/ground/to each other or open circuit
2. Vent flaps stiff
3. Servo motor faulty
4. Air-conditioning system regulator faulty

Air-conditioning system regulator control module, rear: Plugs B, C and D

1. Plug B: Pin 8 'Right B-pillar flap (activate servo motor at rear right B-pillar)'
2. Plug B: Pin 10 'Right B-pillar flap (activate servo motor at rear right B-pillar)'
3. Plug C: Pin 6 'Right B-pillar flap (activate servo motor at rear right B-pillar)'
4. Plug D: Pin 3 '5 V reference voltage'
5. Plug D: Pin 7 'Ground signal'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on rear air-conditioning system regulator control module

1. Short circuit to B+/ground/to each other or open circuit
2. Servo motor flap stiff
3. Servo motor faulty
4. Air-conditioning system regulator faulty

Air-conditioning system regulator control module, rear: Plugs B, C and D

1. Plug B: Pin 7 'Left B-pillar flap (activate servo motor at rear left B-pillar)'
2. Plug C: Pin 3 'Left B-pillar flap (activate servo motor at rear left B-pillar)'
3. Plug C: Pin 5 'Left B-pillar flap (feedback signal lead servo motor at rear left B-pillar)'
4. Plug D: Pin 3 '5 V reference voltage'
5. Plug D: Pin 7 'Ground signal'

DIAGNOSIS/TROUBLESHOOTING CHART

Fault type 'lower limit value not reached'

1. Battery voltage OK (11.4 to 14.5 V)
2. Internal function test completed on air-conditioning system regulator control unit
3. Engine on
4. Ambient temperature > 12 °C

Fault type 'upper limit value exceeded'

1. Battery voltage OK (11.4 to 14.5 V)
2. Internal function test completed on air-conditioning system regulator control unit
3. Engine on

Possible fault causes

Fault type 'lower limit value not reached'

1. Refrigerant pressure < 1.4 bar (min. 2 sec.)

Fault type 'upper limit value exceeded'

1. Refrigerant pressure > 32 bar (5 times within a single driving cycle)

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on rear air-conditioning system regulator control module

1. Upper limit value of power supply exceeded
2. Lower limit value of power supply not reached
3. Short circuit to ground
4. Blower motor defective
5. Air-conditioning system regulator faulty

Air-conditioning system regulator control module, rear: Plugs B, C and D

1. Plug B: Pin 1 'Supply voltage (power supply of 12 V DC, rear blower regulator)'
2. Plug C: Pin 12 'Blower regulator (control line, rear blower regulator)'
3. Plug D: Pin 13 'Feedback voltage (feedback signal rear blower regulator)'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control module

1. Short circuit to B+/ground/to each other or open circuit
2. Vent flaps stiff
3. Servo motor faulty
4. Air-conditioning system regulator faulty

Front air-conditioning system regulator control module: Plugs A and E

1. Plug A: Pin 11 'Temp, valve (feedback signal lead for temperature valve)'
2. Plug A: Pin 21 'Temp, valve (right temperature valve OPEN)'
3. Plug A: Pin 22 'Temp, valve (right temperature valve CLOSED)'
4. Plug E: Pin 1 '5 V reference voltage'
5. Plug E: Pin 8 'Ground sensor'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)

1. Vehicle voltage (battery voltage) exceeded
2. Vehicle voltage (battery voltage) not reached
3. Short circuit to ground
4. Rear air-conditioning system regulator control module faulty

Air-conditioning system regulator control module, rear: Plug D

1. Pin 1 'Term. 30A (power supply)'
2. Pin 15 'Term. 31 (ground supply via ground pin MB22)'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control module

1. Vehicle voltage (battery voltage) exceeded
2. Vehicle voltage (battery voltage) not reached
3. Front air-conditioning system regulator control module faulty

Air-conditioning system regulator control module, front: Plug C

1. Pin 12 'Feedback voltage (feedback voltage front blower regulator)'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control module

1. Short circuit to ground
2. Open circuit/short circuit to B+
3. Blower outlet sensor faulty
4. Front air-conditioning system regulator faulty

Air-conditioning system regulator control module, front: plugs A and E

1. Plug A: Pin 15 'Outlet temperature sensor (signal for left blower outlet sensor)'
2. Plug E: Pin 12 'Ground sensor'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control module

1. Short circuit to ground
2. Open circuit/short circuit to B+
3. Blower outlet sensor faulty
4. Front air-conditioning system regulator faulty

Air-conditioning system regulator control module, front: plugs A and E

1. Plug A: Pin 5 'Outlet temperature sensor (signal for right blower outlet sensor)'
2. Plug E: Pin 12 'Ground sensor'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on rear air-conditioning system regulator control module

1. No or incorrect basic setting
2. Short circuit to ground
3. Open circuit/short circuit to B+
4. Servo motor flap stiff
5. Servo motor faulty
6. Rear air-conditioning system regulator faulty

Air-conditioning system regulator control module, rear: Plugs B, C and D

1. Plug B: Pin 2 'Air-flow flap (air-flow flap servo motor, rear left)'
2. Plug B: Pin 4 'Air-flow flap (activation of air-flow flap servo motor, rear left)'
3. Plug C: Pin 4 'Air-flow flap (feedback signal lead, air-flow flap servo motor, rear left)'
4. Plug D: Pin 3 '5 V reference voltage'
5. Plug D: Pin 7 'Ground signal'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on rear air-conditioning system regulator control module

1. No or incorrect basic setting
2. Short circuit to ground
3. Open circuit/short circuit to B+
4. Servo motor flap stiff
5. Servo motor faulty
6. Rear air-conditioning system regulator faulty

Air-conditioning system regulator control module, rear: Plugs B, C and D

1. Plug B: Pin 3 'Air-flow flap (air-flow flap servo motor, rear right)'
2. Plug B: Pin 5 'Air-flow flap (activation air-flow flap servo motor, rear right)'
3. Plug C: Pin 7 'Air-flow flap (feedback signal lead, air-flow flap servo motor, rear right)'
4. Plug D: Pin 3 '5 V reference voltage'
5. Plug D: Pin 7 'Ground signal'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Internal function test on air-conditioning system regulator control module

1. No or inaccurate air-conditioning system regulator function (No display)
2. No or inaccurate air-conditioning system regulator function (Cannot be checked now)

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control module

1. No signal/communication
2. Implausible signal

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on rear air-conditioning system regulator control module

1. Short circuit to ground
2. Open circuit/short circuit to B+
3. Short circuit between lines
4. Blower outlet sensor faulty
5. Rear air-conditioning system regulator faulty

Air-conditioning system regulator control module, rear: Plug D

1. Pin 6 'Ground sensor'
2. Pin 11 'Outlet temperature sensor (signal for rear left blower outlet sensor)'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on rear air-conditioning system regulator control module

1. Short circuit to ground
2. Open circuit/short circuit to B+
3. Short circuit between lines
4. Blower outlet sensor faulty
5. Rear air-conditioning system regulator faulty

Air-conditioning system regulator control module, rear: Plug D

1. Pin 6 'Ground sensor'
2. Pin 10 'Outlet temperature sensor (signal for rear right blower outlet sensor)'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on for min. 10 s.
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control module

1. Short circuit to B+
2. Short circuit to ground
3. Air-conditioning system regulator faulty

1. 2-zone and 4-zone air conditioning systems

Front air-conditioning system regulator control module: Plug E, pin 1 '5 V reference voltage'

1. Manual air conditioning

Front air-conditioning system regulator control module: Plug E, pin 1 '5 V reference voltage'

1. 2-zone and 4-zone air conditioning systems

DIAGNOSIS/TROUBLESHOOTING CHART

1. Manual air conditioning

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control module

1. Rear air-conditioning system regulator control module faulty
2. CAN comfort faulty

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control module

1. No or incorrect basic setting
2. Short circuit to ground
3. Open circuit/short circuit to B+
4. Servo motor flap stiff
5. Servo motor faulty
6. Front air-conditioning system regulator faulty

Air-conditioning system regulator control module, front: Plugs A and E

1. Plug A: Pin 1 'Passenger blower (servo motor for central vents)'
2. Plug A: Pin 9 'Passenger blower (servo motor for central vents)'
3. Plug A: Pin 14 'Passenger blower (feedback signal lead, servo motor for central vents)'
4. Plug E: Pin 1 '5 V reference voltage'
5. Plug E: Pin 8 'Ground signal'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control module
4. Engine on
5. Engine speed > 2,000 rpm

1. Vehicle voltage (battery voltage) exceeded
2. Vehicle voltage (battery voltage) not reached
3. Short circuit to ground
4. Rear air-conditioning system regulator control module faulty

Air-conditioning system regulator control module, front: Plug E

1. Pin 5 'Term. 30A (power supply)'
2. Pin 9 'Term. 31 (ground supply line for ground pin 22)'
3. Pin 10 'Term. 31 (ground supply line for ground pin 22)'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control module

1. Short circuit to ground
2. Open circuit/short circuit to B+
3. Sun sensor faulty
4. Front air-conditioning system regulator control module faulty

Air-conditioning system regulator control module, front: Plugs C and E

1. Plug C: Pin 7 'Left sun sensor signal'
2. Plug C: Pin 15 'Right sun sensor signal'
3. Plug E: Pin 1 '5 V reference voltage'
4. Plug E: Pin 12 'Ground sensor'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control module

1. No or incorrect basic setting
2. Short circuit to ground
3. Open circuit/short circuit to B+
4. Servo motor flap stiff
5. Servo motor faulty
6. Front air-conditioning system regulator faulty

1. 2-zone and 4-zone air conditioning systems

Air-conditioning system regulator control module, front: Plugs A, C and E

1. Plug A: Pin 2 'Defrost flap (feedback signal lead, defrost flap servo motor)'
2. Plug C: Pin 6 'Defrost flap (defrost flap servo motor OPEN)'
3. Plug C: Pin 24 'Defrost flap (defrost flap servo motor CLOSED)'
4. Plug E: Pin 1 '5 V reference voltage'
5. Plug E: Pin 8 'Ground signal'
6. Manual air conditioning

Air-conditioning system regulator control module, front: Plugs A, C and E

1. Plug A: Pin 1 'Defrost flap (defrost flap servo motor CLOSED)'
2. Plug A: Pin 9 'Defrost flap (defrost flap servo motor OPEN)'
3. Plug C: Pin 15 'Defrost flap (feedback signal lead, defrost flap servo motor)'
4. Plug E: Pin 1 '5 V reference voltage'
5. Plug E: Pin 8 'Ground signal'

1. 2-zone and 4-zone air conditioning systems DIAGNOSIS/TROUBLESHOOTING CHART Work instruction Display OK If not OK 1 Carry out calibration using the 9588 Porsche System Tester II, then: Erase fault memory Satisfy diagnostic conditions Read out fault memory again Fault code 0710 is not entered --> End Fault code 0710 is entered Go to Step 2 2 Perform visual inspection Check flap for stiff operation Check plug contacts and peripheral equipment for signs of damage Go to Step 3 Repair component(s) 3 Check wires between control module and servo motor for short circuit to B+ Switch off ignition Pull off plug 4 (disconnection point Climatronic) Remove plugs A, B, C and E from air-conditioning system regulator and plug from defrost flap servo motor Switch on ignition Measure respective voltage between ground and: Plug A, pin 2, plug C, pin 6, plug C, pin 24, plug E, pin 1, plug E, pin 8 < 0.3 V Go to Step 4 Repair/replace wiring harness --> End 4 Check wires between control module and servo motor for short circuit to ground Switch off ignition Measure respective resistance between ground and: Plug A, pin 2, plug C, pin 6, plug C, pin 24, plug E, pin 1, plug E, pin 8 infinity ohms Go to Step 5 Repair/replace wiring harness --> End 5 Check for short circuit between lines Disconnect plugs on all servo motors Measure resistance between individual lines from air-conditioning system regulator and servo motor Between plug A, pin 2 and servo motor plug, pins 1, 3, 5, 6 Between plug C, pin 6 and servo motor plug, pins 1, 2, 3, 6 Between plug C, pin 24 and servo motor plug, pins 1, 2, 3, 5 Between plug E, pin 1 and servo motor plug, pins 1, 2, 5, 6 infinity ohms Go to Step 6 Repair/replace wiring harness --> End 6 Check wiring between control module and servo motor for open circuit Measure resistance between plug A, pin 2 and servo motor plug, pin 2 Plug C, pin 6 and servo motor plug, pin 5 Plug C, pin 24 and servo motor plug, pin 6 Plug E, pin 1 and servo motor plug, pin 3 Plug E, pin 8 and servo motor plug, pin 1 < 5 ohms Go to Step 7 Repair/replace wiring harness --> End 7 Check internal resistance of servo motor Measure resistance between pins 1 and 3 of servo motor approx. 4 to 5 kohms Go to Step 8 Go to Step 9 8 Check servo motor power supply Push plugs B and E on air-conditioning system regulator Push on plug 4 (disconnection point Climatronic) Push plug on servo motor Switch on ignition Measure voltage between pin 1 and pin 3 of servo motor plug approx. 5 V Go to Step 9 Go to Step 10 9 As an experiment, replace the defrost flap servo motor, then: Erase fault memory Satisfy diagnostic conditions Read out fault memory again Fault code 0710 is not entered --> End Fault code 0710 is entered again Go to Step 10 10 Replace air-conditioning system regulator --> End
2. Manual air conditioning DIAGNOSIS/TROUBLESHOOTING CHART Work instruction Display OK If not OK 1 Carry out calibration using the 9588 Porsche System Tester II, then: Erase fault memory Satisfy diagnostic conditions Read out fault memory again Fault code 0710 is not entered --> End Fault code 0710 is entered Go to Step 2 2 Perform visual inspection Check flap for stiff operation Check plug contacts and peripheral equipment for signs of damage Go to Step 3 Repair component(s) 3 Check wires between control module and servo motor for short circuit to B+ Switch off ignition Remove plugs A, C and E from air-conditioning system regulator and plug from defrost flap servo motor Switch on ignition Measure respective voltage between ground and: Plug A, pin 1, plug A, pin 9, plug C, pin 15, plug E, pin 1, plug E, pin 8 < 0.3 V Go to Step 4 Repair/replace wiring harness --> End 4 Check wires between control module and servo motor for short circuit to ground Switch off ignition Measure respective resistance between ground and: Plug A, pin 1, plug A, pin 9, plug C, pin 15, plug E, pin 1, plug E, pin 8 infinity ohms Go to Step 5 Repair/replace wiring harness --> End 5 Check for short circuit between lines Disconnect plugs on all servo motors Measure resistance between individual lines from air-conditioning system regulator and servo motor Between plug A, pin 1 and servo motor plug, pins 1, 2, 3, 5 Between plug A, pin 9 and servo motor plug, pins 1, 2, 3, 6 Between plug C, pin 15 and servo motor plug, pins 1, 3, 5, 6 Between plug E, pin 1 and servo motor plug, pins 1, 2, 5, 6 infinity ohms Go to Step 6 Repair/replace wiring harness --> End 6 Check wiring between control module and servo motor for open circuit Measure resistance between plug A, pin 1 and servo motor plug, pin 6 Plug A, pin 9 and servo motor plug, pin 5 Plug C, pin 15 and servo motor plug, pin 2 Plug E, pin 1 and servo motor plug, pin 3 Plug E, pin 8 and servo motor plug, pin 1 < 5 ohms Go to Step 7 Repair/replace wiring harness --> End 7 Check internal resistance of servo motor Measure resistance between pins 1 and 3 of servo motor approx. 4 to 5 kohms Go to Step 8 Go to Step 9 8 Check servo motor power supply Push plugs A, C and E on air-conditioning system regulator Push plug on servo motor Switch on ignition Measure voltage between pin 1 and pin 3 of servo motor plug approx. 5 V Go to Step 9 Go to Step 10 9 As an experiment, replace the defrost flap servo motor, then: Erase fault memory Satisfy diagnostic conditions Read out fault memory again Fault code 0710 is not entered --> End Fault code 0710 is entered again Go to Step 10 10 Replace air-conditioning system regulator --> End

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control module

1. No or incorrect basic setting
2. Short circuit to ground
3. Open circuit/short circuit to B+
4. Servo motor flap stiff
5. Servo motor faulty
6. Front air-conditioning system regulator faulty

Air-conditioning system regulator control module, front: Plugs A and E

1. Plug A: Pin 11 'Footwell flap (feedback signal lead for left foot-well flap servo motor)'
2. Plug A: Pin 21 'Footwell flap (servo motor for left footwell flap OPEN)'
3. Plug A: Pin 22 'Footwell flap (servo motor for left footwell flap CLOSED)'
4. Plug E: Pin 1 '5 V reference voltage'
5. Plug E: Pin 8 'Ground signal'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control module

1. No or incorrect basic setting
2. Short circuit to ground
3. Open circuit/short circuit to B+
4. Servo motor flap stiff
5. Servo motor faulty
6. Front air-conditioning system regulator faulty

Air-conditioning system regulator control module, front: Plugs B and E

1. Plug B: Pin 14 'Footwell flap (feedback signal lead for right foot-well flap servo motor)'
2. Plug B: Pin 19 'Footwell flap (servo motor for right footwell flap OPEN)'
3. Plug B: Pin 20 'Footwell flap (servo motor for right footwell flap CLOSED)'
4. Plug E: Pin 1 '5 V reference voltage'
5. Plug E: Pin 8 'Ground signal'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control module

1. No or incorrect basic setting
2. Short circuit to ground
3. Open circuit/short circuit to B+
4. Servo motor flap stiff
5. Servo motor faulty
6. Front air-conditioning system regulator faulty

Air-conditioning system regulator control module, front: Plugs A and E

1. Plug A: Pin 1 'Passenger blower (servo motor for left central vents CLOSED)'
2. Plug A: Pin 9 'Passenger blower (servo motor for left central vents OPEN)'
3. Plug A: Pin 14 'Passenger blower (feedback signal lead, servo motor for left central vents)'
4. Plug E: Pin 1 '5 V reference voltage'
5. Plug E: Pin 8 'Ground signal'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control module

1. No or incorrect basic setting
2. Short circuit to ground
3. Open circuit/short circuit to B+
4. Servo motor flap stiff
5. Servo motor faulty
6. Front air-conditioning system regulator faulty

Air-conditioning system regulator control module, front: Plugs B and E

1. Plug B: Pin 10 'Passenger blower (feedback signal lead, servo motor for right central vents)'
2. Plug B: Pin 17 'Passenger blower (servo motor for right central vents OPEN)'
3. Plug B: Pin 18 'Passenger blower (servo motor for right central vents CLOSED)'
4. Plug E: Pin 1 '5 V reference voltage'
5. Plug E: Pin 8 'Ground signal'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Internal function test completed on air-conditioning system regulator control module

1. Open circuit/short circuit to B+
2. Short circuit to ground
3. Temperature sensor faulty
4. Front air-conditioning system regulator control module faulty

Air-conditioning system regulator control module, front: Plugs A and E

1. Plug A: Pin 4 'Air intake temperature sensor (air intake temperature sensor signal)'
2. Plug E: Pin 12 'Ground sensor (ground sensors)'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control module

1. Short circuit to ground
2. Open circuit/short circuit to B+
3. Sun sensor faulty
4. Front air-conditioning system regulator control module faulty

Air-conditioning system regulator control module, front: Plugs C and E

1. Plug C: Pin 7 'Left sun sensor signal'
2. Plug C: Pin 15 'Right sun sensor signal'
3. Plug E: Pin 1 '5 V reference voltage'
4. Plug E: Pin 12 'Ground sensor'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control module

1. Short circuit to ground
2. Open circuit/short circuit to B+
3. Temperature sensor faulty
4. Front air-conditioning system regulator control module faulty

1. Manual air conditioning

Air-conditioning system regulator control module, front: Plugs C and E

1. Plug C: Pin 21 'Temp, sensor signal (signal for evaporator temperature sensor)'
2. Plug E: Pin 12 'Ground sensor'

1. Manual air conditioning

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control module
4. Engine on

1. Short circuit to B+
2. Implausible signal
3. Open circuit/short circuit to ground
4. Pressure sensor faulty
5. Front air-conditioning system regulator control module faulty

Air-conditioning system regulator control module, front: Plug C

1. Pin 23 '(Pressure sensor)'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Engine on
2. Engine speed > 2,000 rpm

1. Short circuit to B+
2. Open circuit/short circuit to ground
3. Electrical fault in electric circuit
4. Air-conditioning compressor faulty
5. Front air-conditioning system regulator control module faulty

Air-conditioning system regulator control module, front: Plug E

1. Pin 4 'Externally-controlled compressor'
2. Pin 11 'Externally-controlled compressor (freewheel-diode compressor)'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control module

1. Short circuit to ground
2. Open circuit/short circuit to B+

1. 2-zone and 4-zone air conditioning systems

Air-conditioning system regulator control module, front: Plug C

1. Pin 14 'Auxiliary heater (water pump activation)'
2. Manual air conditioning

Air-conditioning system regulator control module, front: Plug A

1. Pin 18 'Auxiliary heater water pump'

1. 2-zone and 4-zone air conditioning systems DIAGNOSIS/TROUBLESHOOTING CHART Work instruction Display OK If not OK 1 Check line for short circuit to B+ Switch off ignition Remove plug C from air-conditioning system regulator Switch on ignition Measure voltage between plug C, pin 14 and ground < 0.3 V Step 2 Repair/replace wiring harness 2 Check line for short circuit to ground Measure resistance between plug C, pin 14 and ground infinity ohms Go to Step 3 Repair/replace wiring harness 3 Check line for open circuit Measure resistance between air-conditioning system regulator plug C, pin 14 and relay socket (V8 naturally-aspirated engine --> relay socket 4; V8 Turbo and V6 --> relay socket 8) pin C. < 5 ohms Go to Step 4 Repair/replace wiring harness 4 As an experiment, replace relay, then: Erase fault memory Satisfy diagnostic conditions Read out fault memory again Fault code 1020 is not entered --> End Fault code 1020 is entered Go to Step 5 5 Replace control module --> End
2. Manual air conditioning DIAGNOSIS/TROUBLESHOOTING CHART Work instruction Display OK If not OK 1 Check line for short circuit to B+ Switch off ignition Pull off air conditioning system regulator plug A Disconnect relay 'relay socket 8 relay box to the right' Switch on ignition Measure voltage between plug A, pin 18 and ground < 0.3 V Step 2 Repair/replace wiring harness 2 Check line for short circuit to ground Measure resistance between plug A, pin 18 and ground infinity ohms Go to Step 3 Repair/replace wiring harness 3 Check line for open circuit Measure resistance between plug A, pin 18 and relay socket pin C. < 5 ohms Go to Step 4 Repair/replace wiring harness 4 As an experiment, replace relay, then: Erase fault memory Satisfy diagnostic conditions Read out fault memory again Fault code 1020 is not entered --> End Fault code 1020 is entered Go to Step 5 5 Replace control module --> End

1. Ignition on

1. Air-conditioning system was not calibrated

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control module

1. No display
2. No or incorrect basic setting/adaptation
3. Short circuit to ground
4. Open circuit/short circuit to B+

Air-conditioning system regulator control module, front: Plugs A and E

1. Plug A: Pin 14 'Air flap (feedback signal lead for temperature valve)'
2. Plug A: Pin 23 'Air flap (right temperature valve OPEN)'
3. Plug A: Pin 24 'Air flap (right temperature valve CLOSED)'
4. Plug E: Pin 1 '5 V reference voltage'
5. Plug E: Pin 8 'Ground sensor'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control module

1. CAN comfort, no signal/communication
2. Additional heating control module switches to limp-home mode
3. Air-conditioning system regulator control module faulty

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control module

1. Short circuit to ground
2. Open circuit/short circuit to B+
3. Blower outlet sensor faulty
4. Front air-conditioning system regulator faulty

Air-conditioning system regulator control module, front: Plugs A and E

1. Plug A: Pin 7 'Outlet temperature sensor (signal for blower outlet sensor, front left footwell)'
2. Plug E: Pin 12 'Ground sensor'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control module

1. Short circuit to ground
2. Open circuit/short circuit to B+
3. Blower outlet sensor faulty
4. Front air-conditioning system regulator faulty

Air-conditioning system regulator control module, front: Plugs A and E

1. Plug A: Pin 6 'Outlet temperature sensor (signal for blower outlet sensor, front right footwell)'
2. Plug E: Pin 12 'Ground sensor'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control module

1. Short circuit to B+/ground/to each other or open circuit
2. Servo motor flap stiff
3. Servo motor faulty
4. Air-conditioning system regulator faulty

Air-conditioning system regulator control module, front: Plugs A and E

1. Plug A: Pin 13 Temp, valve (feedback signal lead for temperature valve)'
2. Plug A: Pin 8 Temp, valve (right temperature valve OPEN)'
3. Plug A: Pin 16 Temp, valve (right temperature valve CLOSED)'
4. Plug E: Pin 1 '5 V reference voltage'
5. Plug E: Pin 8 'Ground sensor'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control module

1. No signal/communication
2. Implausible signal

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control module

1. No signal/communication
2. Please read out fault memory

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control module

1. No signal/communication
2. Air-conditioning system regulator control module faulty

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on rear air-conditioning system regulator control module

Possible causes of faults

1. Short circuit to ground
2. Open circuit/short circuit to B+
3. Seat heating faulty
4. Seat heating control module faulty
5. Rear air-conditioning system regulator faulty

Air-conditioning system regulator control module, rear: Plug C

1. Pin 10 'Left seat heating (rear left seat heating)'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on rear air-conditioning system regulator control module

1. Short circuit to ground
2. Open circuit/short circuit to B+
3. Seat heating faulty
4. Seat heating control module faulty
5. Rear air-conditioning system regulator faulty

Air-conditioning system regulator control module, rear: Plug C

1. Pin 11 'Right seat heating (rear right seat heating)'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control module

1. Short circuit to ground
2. Implausible signal
3. Open circuit/short circuit to B+
4. Air quality sensor faulty
5. Front air-conditioning system regulator control module faulty

Air-conditioning system regulator control module, front: Plug C

1. Pin 19 'Air quality sensor'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control module

1. Short circuit to B+/ground/to each other or open circuit
2. Servo motor flap stiff
3. Servo motor faulty
4. Air-conditioning system regulator faulty

1. 2-zone and 4-zone air conditioning systems

Air-conditioning system regulator control module, front: Plugs A and E

1. Plug A: Pin 3 'Fresh-air/recirculation valve (feedback signal lead, servo motor for fresh-air/recirculation valve)'
2. Plug A: Pin 17 'Fresh-air/recirculation valve (servo motor for fresh-air/recirculation valve OPEN)'
3. Plug A: Pin 18 'Fresh-air/recirculation valve (servo motor for fresh-air/recirculation valve CLOSED)'
4. Plug E: Pin 1 '5 V reference voltage'
5. Plug E: Pin 8 'Ground signal'
6. Manual air conditioning

Air-conditioning system regulator control module, front: Plug A

1. Plug A: Pin 19 'Fresh-air/recirculation valve (servo motor for fresh-air/recirculation valve OPEN)'
2. Plug A: Pin 20 'Fresh-air/recirculation valve (servo motor for fresh-air/recirculation valve CLOSED)'

1. 2-zone and 4-zone air conditioning systems

DIAGNOSIS/TROUBLESHOOTING CHART

1. Manual air conditioning

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control module

1. No or incorrect basic setting
2. Short circuit to ground
3. Open circuit/short circuit to B+
4. Servo motor flap stiff
5. Servo motor faulty
6. Front air-conditioning system regulator faulty

Air-conditioning system regulator control module, front: Plugs A and E

1. Plug A: Pin 8 'Left temp, valve (left temperature valve OPEN)'
2. Plug A: Pin 13 'Left temp, valve (feedback signal lead for left temperature valve)'
3. Plug A: Pin 16 'Left temp, valve (left temperature valve CLOSED)'
4. Plug E: Pin 1 '5 V reference voltage'
5. Plug E: Pin 8 'Ground signal'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control module

1. No or incorrect basic setting
2. Short circuit to ground
3. Open circuit/short circuit to B+
4. Servo motor flap stiff
5. Servo motor faulty
6. Front air-conditioning system regulator faulty

Air-conditioning system regulator control module, front: Plugs A and E

1. Plug A: Pin 12 'Right temp, valve (feedback signal lead for right temperature valve)'
2. Plug A: Pin 19 'Right temp, valve (right temperature valve OPEN)'
3. Plug A: Pin 20 'Right temp, valve (right temperature valve CLOSED)'
4. Plug E: Pin 1 '5 V reference voltage' Plug E: Pin 8 'Ground signal'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on rear air-conditioning system regulator control module

1. Short circuit to B+
2. Short circuit or open circuit
3. Short circuit to ground
4. Servo motor flap stiff
5. Servo motor faulty
6. Rear air-conditioning system regulator faulty

Air-conditioning system regulator control module, rear: Plugs B, C and D

1. Plug B: Pin 9 'Passenger blower (passenger blower, rear left tunnel OPEN)1
2. Plug C: Pin 2 'Passenger blower (passenger blower, rear left tunnel CLOSED)1
3. Plug C: Pin 16 'Passenger blower (feedback signal lead, passenger blower, rear left tunnel)'
4. Plug D: Pin 3 '5 V reference voltage'
5. Plug D: Pin 7 'Ground signal'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on rear air-conditioning system regulator control module

1. Short circuit to B+
2. Short circuit or open circuit
3. Short circuit to ground
4. Servo motor flap stiff
5. Servo motor faulty
6. Rear air-conditioning system regulator faulty

Air-conditioning system regulator control module, rear: Plugs B, C and D

1. Plug B: Pin 16 'Passenger blower (passenger blower, rear right tunnel OPEN)1
2. Plug B: Pin 17 'Passenger blower (passenger blower, rear right tunnel CLOSED)'
3. Plug C: Pin 13 'Passenger blower (feedback signal lead, passenger blower, rear right tunnel)'
4. Plug D: Pin 3 '5 V reference voltage'
5. Plug D: Pin 7 'Ground signal'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on rear air-conditioning system regulator control module

1. Short circuit to B+
2. Short circuit or open circuit
3. Short circuit to ground
4. Servo motor flap stiff
5. Servo motor faulty
6. Rear air-conditioning system regulator faulty

Air-conditioning system regulator control module, rear: Plugs B, C and D

1. Plug B: Pin 14 'Left temp, valve (servo motor for rear left temperature valve OPEN)'
2. Plug B: Pin 15 'Left temp, valve (servo motor for rear left temperature valve CLOSED)'
3. Plug C: Pin 14 'Left temp, valve (feedback signal lead, servo motor for rear left temperature valve)'
4. Plug D: Pin 3 '5 V reference voltage'
5. Plug D: Pin 7 'Ground signal'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on rear air-conditioning system regulator control module

1. Short circuit to B+
2. Short circuit or open circuit
3. Short circuit to ground
4. Servo motor flap stiff
5. Servo motor faulty
6. Rear air-conditioning system regulator faulty

Air-conditioning system regulator control module, rear: Plugs B, C and D

1. Plug B: Pin 12 'Right temp, valve (servo motor for rear right temperature valve OPEN)'
2. Plug B: Pin 13 'Right temp, valve (servo motor for rear right temperature valve CLOSED)'
3. Plug C: Pin 15 'Right temp, valve (feedback signal lead, servo motor for rear right temperature valve)'
4. Plug D: Pin 3 '5 V reference voltage'
5. Plug D: Pin 7 'Ground signal'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control module

1. No or incorrect basic setting
2. Short circuit to ground
3. Open circuit/short circuit to B+
4. Servo motor flap stiff
5. Servo motor faulty
6. Front air-conditioning system regulator faulty

Air-conditioning system regulator control module, front: Plugs A and E

1. Plug A: Pin 11 'Footwell flap (feedback signal lead for footwell flap servo motor)'
2. Plug A: Pin 21 'Footwell flap (servo motor for footwell flap OPEN)'
3. Plug A: Pin 22 'Footwell flap (servo motor for footwell flap CLOSED)'
4. Plug E: Pin 1 '5 V reference voltage'
5. Plug E: Pin 8 'Ground signal'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control unit

For manual air conditioning system

1. Fault in servo motor for front air distribution, Refer to " «SERVO MOTOR FOR FRONT AIR DISTRIBUTION»(/porsche/cayenne-s/i-2002-2007/remont/automatic-hvac-system/#air-conditioning-diagnostics) "

For 2-zone air conditioning system

1. No or incorrect basic setting
2. Short circuit to ground
3. Open circuit/short circuit to B+
4. Servo motor flap stiff
5. Servo motor faulty
6. Front air-conditioning system regulator faulty

Air-conditioning system regulator control unit, front: Plugs A, C and E

1. Plug A: Pin 23 'Passenger blower (servo motor for left side vents OPEN)'
2. Plug A: Pin 24 'Passenger blower (servo motor for left side vents CLOSED)'
3. Plug C: Pin 5 'Passenger blower (feedback signal lead, servo motor for left side vents)'
4. Connector E: Pin 1 '5 V reference voltage'
5. Connector E: Pin 8 'Ground signal'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control module

1. Short circuit to ground
2. Open circuit/short circuit to B+
3. Blower regulator faulty
4. Blower motor faulty
5. Front air-conditioning system regulator faulty

1. 2-zone and 4-zone air conditioning systems

Air-conditioning system regulator control module, front: Plug C

1. Pin 8 'Supply voltage (power supply to front blower regulator)'
2. Manual air conditioning

Air-conditioning system regulator control module, front: Plug A

1. Pin 'Supply voltage (power supply to front blower regulator)'

1. 2-zone and 4-zone air conditioning systems

DIAGNOSIS/TROUBLESHOOTING CHART

1. Manual air conditioning

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on rear air-conditioning system regulator control module

1. Short circuit to ground
2. Open circuit/short circuit to B+
3. Blower regulator faulty
4. Blower motor faulty
5. Rear air-conditioning system regulator faulty

Air-conditioning system regulator control module, rear: Plug B

1. Pin 1 'Supply voltage (power supply to rear blower regulator)'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control module

1. CAN comfort, no signal/communication
2. Additional heating control module switches to limp-home mode
3. Air-conditioning system regulator control module faulty

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control module

1. Short circuit to B+
2. Short circuit or open circuit
3. Short circuit to ground
4. Servo motor flap stiff
5. Servo motor faulty
6. Air-conditioning system regulator faulty

Air-conditioning system regulator control module, front: Plugs A, C and E

1. Plug A: Pin 23 'Servo motor for left side vents open'
2. Plug A: Pin 24 'Servo motor for left side vents closed'
3. Plug C: Pin 5 'Feedback signal for left side vents'
4. Plug E: Pin 1 '5 V reference voltage'.
5. Plug E: Pin 8 'Ground signal'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control module

1. Short circuit to B+
2. Short circuit or open circuit
3. Short circuit to ground
4. Servo motor flap stiff
5. Servo motor faulty
6. Air-conditioning system regulator faulty

Air-conditioning system regulator control module, front: Plugs B and E

1. Plug B: Pin 1 'Passenger blower (servo motor for right side vents OPEN)'
2. Plug B: Pin 5 'Passenger blower (feedback signal lead, servo motor for right side vents)'
3. Plug B: Pin 9 'Passenger blower (servo motor for right side vents CLOSED)'
4. Plug E: Pin 1 '5 V reference voltage'
5. Plug E: Pin 8 'Ground signal'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on air-conditioning system regulator control module

1. Short circuit to ground
2. Open circuit/short circuit to B+

1. 2-zone and 4-zone air conditioning systems

Air-conditioning system regulator control module, front: Plug C

1. Pin 14 'Auxiliary heater (water pump activation)'
2. Manual air conditioning

Air-conditioning system regulator control module, front: Plug A

1. Pin 18 'Auxiliary heater water pump'

1. 2-zone and 4-zone air conditioning systems

DIAGNOSIS/TROUBLESHOOTING CHART

1. Manual air conditioning

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Internal function test on air-conditioning system regulator control module

1. No or inaccurate air-conditioning system regulator function (Short circuit to ground)
2. No or inaccurate air-conditioning system regulator function (Open circuit/short circuit to B+)

Air-conditioning system regulator control module, plug C

1. Pin 23 'DS (air-conditioning pressure sensor)'

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on rear air-conditioning system regulator control module

1. Short circuit to B+
2. Short circuit or open circuit
3. Short circuit to ground
4. Servo motor flap stiff
5. Servo motor faulty
6. Rear air-conditioning system regulator faulty

Air-conditioning system regulator control module, rear: Plugs B, C and D

1. Plug B: Pin 9 'Passenger blower (passenger blower, rear left tunnel OPEN)'
2. Plug C: Pin 2 'Passenger blower (passenger blower, rear left tunnel CLOSED)'
3. Plug C: Pin 16 'Passenger blower (feedback signal lead, passenger blower, rear left tunnel)'
4. Plug D: Pin 3 '5 V reference voltage'
5. Plug D: Pin 7 'Ground signal'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on rear air-conditioning system regulator control module

1. Short circuit to B+
2. Short circuit or open circuit
3. Short circuit to ground
4. Servo motor flap stiff
5. Servo motor faulty
6. Rear air-conditioning system regulator faulty

Air-conditioning system regulator control module, rear: Plugs B, C and D

1. Plug B: Pin 16 'Passenger blower (passenger blower, rear right tunnel OPEN)'
2. Plug B: Pin 17 'Passenger blower (passenger blower, rear right tunnel CLOSED)'
3. Plug C: Pin 13 'Passenger blower (feedback signal lead, passenger blower, rear right tunnel)'
4. Plug D: Pin 3 '5 V reference voltage'
5. Plug D: Pin 7 'Ground signal'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on rear air-conditioning system regulator control module

1. Short circuit to B+
2. Short circuit or open circuit
3. Short circuit to ground
4. Servo motor flap stiff
5. Servo motor faulty
6. Rear air-conditioning system regulator faulty

Air-conditioning system regulator control module, rear: Plugs B, C and D

1. Plug B: Pin 14 'Left temp, valve (servo motor for rear left temperature valve OPEN)'
2. Plug B: Pin 15 'Left temp, valve (servo motor for rear left temperature valve CLOSED)'
3. Plug C: Pin 14 'Left temp, valve (feedback signal lead, servo motor for rear left temperature valve)'
4. Plug D: Pin 3 '5 V reference voltage'
5. Plug D: Pin 7 'Ground signal'

DIAGNOSIS/TROUBLESHOOTING CHART

1. Ignition on
2. Battery voltage OK (11.4 to 14.5 V)
3. Internal function test completed on rear air-conditioning system regulator control module

1. Short circuit to B+
2. Short circuit or open circuit
3. Short circuit to ground
4. Servo motor flap stiff
5. Servo motor faulty
6. Rear air-conditioning system regulator faulty

Air-conditioning system regulator control module, rear: Plugs B, C and D

1. Plug B: Pin 12 'Right temp, valve (servo motor for rear right temperature valve OPEN)'
2. Plug B: Pin 13 'Right temp, valve (servo motor for rear right temperature valve CLOSED)'
3. Plug C: Pin 15 'Right temp, valve (feedback signal lead, servo motor for rear right temperature valve)'
4. Plug D: Pin 3 '5 V reference voltage'
5. Plug D: Pin 7 'Ground signal'

DIAGNOSIS/TROUBLESHOOTING CHART

Poses Online

See also:
• 97 10 19 REMOVING AND INSTALLING VEHICLE ELECTRICAL SYSTEM CONTROL UNIT - AS OF MY 2003 (ALL MODELS)
• FAULT OVERVIEW
• 90 35 19 REMOVING AND INSTALLING GATEWAY CONTROL UNIT - AS OF MY 2005 (ALL MODELS)
• FAULT OVERVIEW
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