HH. Checking Trunk Lid Door Switch

HHA. Fault Tracing

Condition
No diagnostic trouble codes (DTCs) stored.

Possible Source
Open-circuit in signal cable from door switch in trunk lid/tailgate lock unit.
Open-circuit in lock unit ground lead.
Faulty door switch in trunk lid/tailgate lock unit.

Start fault-tracing with HHB.


HHB1. Checking Signal From Door Switch, Trunk Lid





Ignition on.
Trunk lid/tailgate closed.
Go into scrolling values.
Read off the trunk lid door switch status.
The value should be HIGH when the trunk lid is closed.
Is the value HIGH?
Yes: Fault not found
No: Go to HHB2.

HHB2. Checking Connectors





Check VGLA control module connector and trunk lid lock unit connector for contact resistance and oxidation according to WWA5 WW. Checking Wiring and Connections
Ignition on.
Trunk lid/tailgate closed.
Go into scrolling values.
Read off the trunk lid/tailgate door switch status.
The value should be LOW when the trunk lid/tailgate is closed.
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 HHB3.


HHB3. Checking For An Open-Circuit





Check cable between VGLA control module #A19 and trunk lid/tailgate lock unit terminal 1 and cable between trunk lid/tailgate lock unit terminal 4 and ground for an open-circuit according to WWA2 WW. Checking Wiring and Connections
Were any faults found in the cables?
Yes: Go to HHB5.
No: Go to HHB4.


HHB4. Replacing Component

Replace trunk lid lock unit.
Then continue with HHB5.


HHB5. Verification





Hint: After carrying out the repair check that the fault has been remedied.

Ignition off.
Reconnect connectors, reinstall components.
Ignition on.
Trunk lid/tailgate closed.
Go into scrolling values.
Read off the trunk lid/tailgate door switch status.
The value should be LOW when the trunk lid/tailgate is open.
Is the value LOW?
Yes: Fault corrected
No: Fault not found