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Remote control, tailgate release

Symptom: Tailgate cannot be disarmed/opened.

Remote control, tailgate release

Fault symptom

Tailgate cannot be disarmed/opened.



Diagnostic procedure

1 Check the operation of the tailgate release




- Connect the ISAT scan tool.

- Select "READ VALUES".

- Select "TAILGATE LOCK".


The ISAT scan tool should display "CLOSED". Press the right-hand button on the remote control. The ISAT scan tool should display "OPEN" for about 3 seconds and the tailgate motor should be activated.

Is the function correct?

yes

Continue with point 7.


no

If the ISAT scan tool displays "OPEN" for about 3 seconds but the tailgate motor is not activated, continue with point 2. If the ISAT scan tool displays "CLOSED", proceed to point 4.


2 Check the unlock signal from the electronic control module




- Unplug connector H26-4 (RHD).

- Unplug connector H26-1 (LHD).

- Connect the test lamp to pin 22 of connector H26-4 (H26-1) and a good grounding point.

- Press the right-hand button on the remote control.


Is the test lamp on?

yes

Continue fault diagnosis as described in Service Manual 3:2 "Central locking system, electrically operated tailgate release".


no

Continue with point 3.


3 Check the wiring connected to the electronic control module

Check the wiring harness for continuity between pin 23 of the electronic control module and pin 22 of connector H26-4.

The resistance should be < 1 ohm.

Is the resistance correct?

yes

Continue with point 7.


no

Repair or replace the wiring harness.


4 Check the operation of the tailgate release




- Select "ACTIVATE".

- Select "TAILGATE".

- Select "ON".


The tailgate motor should be activated.

Does the tailgate unlock?

yes

Continue with point 6.


no

Continue with point 5.


5 Check the operation of the tailgate release




- Unplug connector H26-4.

- Connect the test lamp to connector H26-4, pin 22, and a good grounding point.

- Select "ACTIVATE".

- Select "TAILGATE".

- Select "ON".


The test lamp should light.

Is the test lamp on?

yes

Try changing the remote control.


no

Continue with point 7.


6 Check the remote control




- Select "READ VALUES".

- Select "CONTROL".

- Press the right-hand button on the remote control.


The ISAT scan tool should display "RH BUTTON" when this button is pressed.

Is ISAT displaying the correct text?

yes

Continue with point 7.


no

Try changing the remote control.


7 Final check

Check to see if the fault symptom remains.

Is the problem still present?

yes

See "Before replacing a control module".


no

The remedial measures taken were correct or the fault is of intermittent nature.