SS. Checking Signal Cable, Courtesy Lighting

SSA. Fault Tracing

Condition
No diagnostic trouble codes (DTCs) stored.
The courtesy lighting can be controlled using the switch in roof lamp.

Possible Source
Open-circuit in control signal cable to courtesy lighting.
Start fault-tracing with SSB.


SSB1. Checking Voltage






Ignition off.
Disconnect VGLA control module.
The courtesy lighting switch should be in the DOOR position.
Connect a voltmeter between large VGLA control module connector terminal 24 and ground.
Voltage should be approximately battery voltage.
If reading is OK: Go to SSB3.
If reading is incorrect: Go to SSB2.


SSB2. Checking Cable

Check cable between VGLA control module #A24 and roof lamp connector terminal 5 for an open-circuit according to WWA2 WW. Checking Wiring and Connections Check roof lamp connector for contact resistance and oxidation according to
Remedy as necessary. Select "Continue".
Yes: Go to SSB5.


SSB3. Checking Connectors





Check VGLA control module connector for contact resistance and oxidation according to WW. Checking Wiring and Connections
Connect VGLA control module.
The switch should be in the DOOR position.
Check that courtesy lighting works by opening a door.
Is the courtesy lighting working?
Yes: Fault corrected
No: Go to SSB4.


SSB4. Replacing Component

Try a new VGLA control module according to replacing main control module.
Then continue with SSB5.


SSB5 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 open.
Go into scrolling values.
Read oft the trunk lid/tailgate door switch status.
The value should be HIGH when the trunk lid/tailgate is open.
If reading is OK: Fault corrected
If reading is incorrect: Fault not found