Input Signals

This function allows the following input signals to be checked:

- Door contacts

- Engine compartment switch

- Luggage compartment switch

- Position switches at drive motors

- Central locking system button

- Glove compartment button

- Radio closed loop

- Alarm contact radio bracket

- Microswitch for activation of alarm

- Microswitch for deactivation of alarm

- Input 1 (auxiliary system)

- Input 2 (auxiliary system)

- Input 3 (auxiliary system)

- Speedo signal

- Term. 15

- Term. 61

1.





Open is displayed if at least one door is open. Closed is displayed if both doors are closed. If required, check wiring to alarm control unit for open circuit or short to ground according to wiring diagram.

2.





Open is displayed if engine hood is open. Closed is displayed if engine hood is closed. If required, check wiring to alarm control unit for open circuit or short to ground according to wiring diagram.

3.





Open is displayed if tailgate is open. Closed is displayed if tailgate is closed. It required, check wiring to alarm control unit for open circuit or short to ground according to wiring diagram.

4.





This display appears it both lock buttons are in the "open" position.

4a.





This display appears it one lock button is in the "open" and one lock button is in the "closed" position.

4b.





This display appears it both lock buttons are in the closed" position. If required, check position switch, Test Point 4

5.





Open is displayed it the central locking system button has not been pressed down. Closed display appears it the central locking system button is pressed down.

6.





Open is displayed it glove compartment is open. Closed is displayed if glove compartment is closed.

7.





The closed loop must be closed. On radios that do not have this contact terminal, terminal 13, plug II, is wired to ground.

- It the closed loop is open, check wiring from alarm control unit, terminal 13, to ground point XX or to radio for open circuit.

8.





It Radio contact closed is displayed:

- Check insulating strip on radio.

- Check wiring from alarm control unit plug II, terminal 9, to alarm contact at radio bracket or to alarm contact at CD player for short to ground.

9.





Note: The spare key is required for checks according to item 9 and 10 since the ignition must be switched off during the diagnostics.

Use the spare key to turn the locks of the driver's and passenger doors into the "locking" position one after another. The display must then switch from "open" to "closed" ("locked").

- If "closed 2" ("locked") is displayed in the rest position, check wiring from the lock barrels to the alarm control unit connector II, terminal 1, (terminal 2 for RHD vehicles) for short to ground according to wiring diagram.

- If the display remains set to "open" after then lock barrels have been actuated, check wirings for continuity according to wiring diagram.

10.





Use the spare key to turn the locks of the driver's and passenger doors into the "open" position one after another. The display must then switch from "open" to "closed" ("locked").

If "closed" ("locked") is displayed in the rest position, check wiring from the lock barrels to the alarm control unit connector II, terminal 2, (terminal 1 for RHD vehicles) for short to ground according to wiring diagram.

- If the display remains set to "open" after the lock barrels have been actuated, check wirings for continuity according to wiring diagram.

11.





Note: On vehicles with rear parcel shelf (Cabriolet and Targa), the contacts of the rear parcel trays are wired to this input. Display "open" for inputs that are not wired or if the parcel trays are closed (contacts open).

Display "closed" if at least one parcel tray is open (contact closed). If required, check wiring according to wiring diagram.

12.





In standard version, this input is not wired. Auxiliary systems may be wired across this input. Display is "open" if input is not wired. If required, check auxiliary system according to manufacturer's instructions.

13.





Refer to item 12.

14.





Display is not present if vehicle is stationary. Display is present if vehicle is moving. If required, check wiring from alarm control unit plug II, terminal 6, to speedometer according to wiring diagram.

15.





If display is not present, check wire from alarm control unit plug II, terminal 18, to central electrical system according to wiring diagram.

16.





Note: If present is displayed although the engine is not running, this may be due to a summary fault (refer to item 4, Drive links functional group). In this case, start by remedying this fault.

If display is not present although the engine is running, check wire from alarm control unit plug II, terminal 23, to generator according to wiring diagram.