Troubleshooting With No Control Module Connected
Troubleshooting with no control module connectedNOTE: 9588 Porsche System Tester II and the air-conditioning system regulator control module are not connected.
Overview
Diagnostic conditions
- Ignition on
- The fuses of the 'air-conditioning system regulator control module' are OK
- The fuses of the 'gateway control module' in the instrument cluster are OK
- Battery voltage is OK '(11.4-14.4 V)'
- Plug on 'gateway control module' fitted correctly
- Plug on 'air-conditioning system regulator control module' fitted correctly
Possible cause of fault
- Incorrect vehicle type selected in 9588 Porsche System Tester II
- 9588 Porsche System Tester II is not connected correctly or is faulty
- Power supply to the 'air-conditioning system regulator control module' is not OK
- Power supply to the 'gateway control module' is not OK
- 'K' lead' from diagnostic box to 'gateway control module' in instrument cluster does not function
- 'Gateway' in instrument cluster does not function
- 'CAN comfort (B)' does not function
- 'Air-conditioning system regulator control module' does not function
Affected pins
Diagnostic box
- Pin 1 'Power supply terminal 15/(fuse carrier at left of dashboard, F 51)'
- Pin 3 'K lead'
- Pin 4 'Ground terminal 31'
- Pin 5 'Ground terminal 31'
Plug 'E' on front air-conditioning system regulator control module:
- Pin 5 'Power supply terminal 30a/(fuse carrier at right of dashboard, F 23)'
- Pin 9 'Ground input (terminal 31) MB 22'
- Pin 10 'Ground input (terminal 31) MB 22'
Plug 'C' on front air-conditioning system regulator control module:
- Pin 17 'CAN comfort high'
- Pin 18 'CAN comfort low'
Diagnostic box in driver's footwell
Diagnosis/troubleshooting
