AA. Checking Signal From Door Switches, Side Doors
AAA. Fault Tracing
Condition
No diagnostic trouble codes (DTCs) stored.
Possible Source
Open-circuit in signal cable to door switch.
Faulty door switch.
Start fault-tracing with AAB.
AAB1. Checking Signal From Door Switch, Driver's Door.
Ignition on.
Go into scrolling values.
Open the driver's door.
Read off the status of the door switch in the driver's door.
The value should be LOW when the door is open.
Is the value LOW?
Yes: Go to AAB5.
No: Go to AAB2.
AAB2. Checking Door Switch
Expose driver's door lock unit.
Check VGLA control module and black lock unit connector for contact resistance and oxidation according to WWA5 WW. Checking Wiring and Connections
Ignition on.
Go into scrolling values.
Open the door
Read off the status of the door switch in the driver's door.
The value should be LOW when the door is open.
If the value is OK the cause of the fault has been loose connections in the connectors.
Is the value LOW?
Yes: Fault corrected
No: Go to AAB3.
AAB3. Checking For An Open-Circuit
For left-hand drive cars: cable between control module #A23 and black lock unit connector terminal 4 and cable between black lock unit connector terminal 3 and ground for an open-circuit according to WWA2. For right-hand drive cars: cable between control module #A23 and black lock unit connector terminal 1 and cable between black lock unit connector terminal 2 and ground for an open-circuit according to WWA2 WW. Checking Wiring and Connections
Were any faults found in the cables?
Yes: Fault corrected
No: Go to AAB4.
AAB4. Replacing Component
Replace lock unit according.
Then continue with AAB12.
AAB5. Checking Signal From Door Switch, Other Doors
Ignition on.
Go into scrolling values.
Close passenger door the rear side doors. Open and close one door at a time reading off the door switch status at the same time.
The value should change from HIGH to LOW when the door is opened.
Select one of the following alternatives:
Select 1 if all doors display the correct value. Select 2 if the passenger door does not display the correct value.
Select 3 if the left rear door does not display the correct value.
Select 4 if the right rear door does not displays the correct value.
Alternative 1: Fault not found
Alternative 2: Go to AAB6.
Alternative 3: Go to AAB7.
Alternative 4: Go to AAB8.
AAB6. Checking Door Switch In Passenger Door
Expose passenger door lock unit.
Check VGLA control module and black lock unit connector for oxidation and contact resistance according to mWWA5 WW. Checking Wiring and Connections
Ignition on.
Go into scrolling values.
Close the passenger door.
Open the passenger door, check the door switch status.
The value should change from HIGH to LOW. If the value is OK the fault has probably been caused by loose connections in the connectors.
Does the value change from HIGH to LOW?
Yes: Fault corrected
No: Go to AAB9.
AAB7. Checking Door Switch In The Left Rear Door
Expose the left rear door lock unit.
Check VGLA control module and black lock unit connector for oxidation and contact resistance according to WWA5 WW. Checking Wiring and Connections
Ignition on.
Go into scrolling values.
Close the door.
Open the door, check door switch status. The value should change from HIGH to LOW. If the value is OK the fault has probably been caused by loose connections in the connectors.
Does the value change from HIGH to LOW?
Yes: Go to AAB12.
No: Go to AAB10.
AAB8. Checking Door Switch In Right Rear Door
Expose the right rear door lock unit.
Check VGLA control module and black lock unit connector for oxidation and contact resistance according to WWA5 WW. Checking Wiring and Connections
Ignition on.
Go into scrolling values.
Close the door.
Open the door, check door switch status. The value should change from HIGH to LOW. If the value is OK the fault has probably been caused by loose connections in the connectors.
Does the value change from HIGH to LOW?
Yes: Fault corrected
No: Go to AAB11.
AAB9. Checking For An Open-Circuit
For left-hand drive cars:
Check cable between VGLA control module #B5 and black lock unit terminal 1 and the cable between black lock unit connector terminal 2 and ground for an open-circuit according to WWA2 WW. Checking Wiring and Connections
For right-hand drive cars:
Check cable between VGLA control module #B5 and black lock unit connector terminal 4 and the cable between black lock unit connector terminal 3 and ground for an open-circuit according to WWA2. As in above check.
Were any faults found in the cables?
Yes: Go to AAB12.
No: Go to AAB4.
AAB10. Checking For An Open-Circuit
Check cable between VGLA control module #B6 and black lock unit connector terminal 4 and the cable between black lock unit connector terminal 3 and ground for an open-circuit according to WWA2 WW. Checking Wiring and Connections
Were any faults found in the cables?
Yes: Fault corrected
No: Go to AAB4.
AAB11. Checking For An Open-Circuit
Check cable between VGLA control module #B7 and black lock unit connector terminal 1 and the cable between black lock unit connector terminal 2 and ground for an open-circuit according to WWA2 WW. Checking Wiring and Connections
Were any faults found in the cables?
Yes: Fault corrected
No: Go to AAB4.
AAB12. Verification
Hint: After carrying out the repair check that the fault has been remedied.
Ignition off.
Reconnect connectors, reinstall components.
Ignition on.
Go into scrolling values.
Close all doors.
Open and close one door at a time.
Read off the status of the door switches.
The door switch status should change from HIGH to LOW when the door is opened.
Does the value change from HIGH to LOW?
Yes: Fault corrected
No: Fault not found