skoda Workshop Repair Guides

Skoda Workshop Service and Repair Manuals

ABOUT US
Reading measured value block with LIN databus cable > < Fault table of control unit for convenience system with LIN databus cable

Fabia Mk1

Fault table of LIN databus/control units for window control in the individual doors
Fault table of LIN databus/control units for window control in the individual doors
The table is used for determining faults of LIN databus (interruption or short circuit), if the window control is restricted or fully non-operational.
Possible faults in the system of the window control with LIN databus cable:
In the convenience sytem with LIN databus cable (window control) 5 fault conditions must be distinguished:
t  Short circuit of LIN databus to earth or positive
t  No communication from control unit for window control/driver door (problems with transmission or reception wiring or databus interruption between CU for window control/driver door and CU for window control/other doors).
t  No communication from control unit for window control/front passenger door (problems with transmission or reception wiring or databus interruption between CU for window control/front passenger and CU for window control/other doors).
t  No communication from control unit for window control/door RL (problems with transmission or reception wiring or databus interruption between CU for window control/door RL and CU for window control/other doors).
t  No communication from control unit for window control/door RR (problems with transmission or reception wiring or databus interruption between CU for window control/door RR and CU for window control/other doors).
In case of fault finding (window control restricted or fully non-operational) it is required:
l  To disconnect battery for more than 30 seconds.
l  To deactivate child safety locks (must be inactive).
l  To close front doors (door contact switch in position disconnected).
l  To switch on ignition.
l  To initialise all windows (if possible).
  Note
t  If the battery is disconnected and reconnected, carry out additional operations → Electrical System; Rep. Gr.27.
t  All the possible faults which can occur during the communication among the control units for window control in the individual doors are listed below.
   
Conditions of control units for window control, door:Possible cause of faultRectifying fault
Driver's sideFront passengerRear leftRear right
Limited functionEmergency operation functionEmergency operation functionEmergency operation function
t  Short circuit of LIN databus to earth or positive
–  Check wiring and plug connections for short circuit according to the current flow diagram
Full functionEmergency operation functionEmergency operation functionEmergency operation function
t  No communication from CU for window control/driver door
–  Check wiring and plug connections for interruption according to the current flow diagram
–  Replace CU for window control/driver door
Full functionEmergency operation functionFull functionFull function
t  No communication from CU for window control/front passenger door
–  Check wiring and plug connections for interruption according to the current flow diagram
–  Replace CU for window control/front passenger door
Full functionFull functionEmergency operation functionFull function
t  No communication from CU for window control/rl door
–  Check wiring and plug connections for interruption according to the current flow diagram
–  Replace CU for window control/rl door
Full functionFull functionFull functionEmergency operation function
t  No communication from CU for window control/rr door
–  Check wiring and plug connections for interruption according to the current flow diagram
–  Replace CU for window control/rr door

t  Full function: The control unit performs all operations of window control completely.
t  Limited function: The control unit performs all operations of the window control except automatic lift/lower lift mechanism.
t  Emergency operation function: If there is no communication between the control unit and other control units, the window control only functions by means of a button on the relevant door without jamming protection. After 10 minutes the control unit switches over to “No operation”.
t  No operation: The control unit without operation and without communication with other control units. By resetting the control unit for more than 30 seconds, the control unit switches over to “emergency operation function”.
Resetting of the relevant door control unit is performed by disconnecting the plug connection at the relevant control unit for more than 30 seconds (voltage interruption).
Resetting of all door control units is performed by disconnecting the vehicle battery for more than 30 seconds.
  Note
If the battery is disconnected and reconnected, carry out additional operations → Electrical System; Rep. Gr.27.
   

Reading measured value block with LIN databus cable > < Fault table of control unit for convenience system with LIN databus cable