Central Locking System Does Not Activate to Deadlock Position

WARNING! The deadlock can only be activated with the door key in either of the front doors or with the remote-control unit.

D1: Function Check Of Central Locking System.

Switch oft ignition.
Close all doors.
Check If the central lock can be activated from either of the front doors by turning the key approx. 60°.





If the central lock is activated on all doors:
Check supply voltage (30) to deadlock relay D2.

If central lock is activated on one door:
Mechanical function check for fault in one door F1
.
If central lock is not activated on any of the doors:
Check fuses C1.

D2: Check Voltage Supply (30) To Deadlock Relay.

Switch off ignition.
Remove deadlock relay 2/47.
Connect a voltmeter between relay base terminals 30 and 31.
Voltmeter should Indicate battery voltage.





If reading is correct:
Check signal lead AL1 D3.

If reading is incorrect:
Open-circuit or short circuit in voltage supply lead between relay base terminal 30 and fuseholder position 11/6:2 at fuse 6. Correct fault or replace deadlock voltage supply lead. Reinstall deadlock relay 2/47.


D3: Check Signal Lead AL1.

Switch off ignition.





Remove central locking relay 2/7.
Connect an ohmmeter between terminal AL1 at the deadlock relay and central locking relay bases.





The ohmmeter should indicated approx. 0 Ohm.
Connect an ohmmeter between terminals AL1 and 31 at the deadlock relay base.





Ohmmeter should indicate infinite resistance. Connect a voltmeter between terminals AL1 and 30 at the deadlock relay base. Voltmeter should Indicate approx. 0 V.





If reading is correct:
Check Interior courtesy lighting signal lead D4.

If reeding is Incorrect:
Open-circuit or short circuit in signal lead between
AL1 at deadlock relay and central locking relay bases. Correct fault or replace signal lead between terminal AL1 at deadlock relay and central locking relay bases. Reinstall central locking relay 2/7. Reinstall deadlock relay 2/47.



D4: Checking Interior Courtesy Light Signal Lead

Switch off ignition.





Close all doors.
Connect an ohmmeter between terminals T and 31 at the central locking relay base. Ohmmeter should indicate infinite resistance.





If reading is correct:
Check operating switch signal leads D5.

If reading is Incorrect:
Check central locking unit switches for interior lighting K5.



D5: Checking operating switch signal leads

Switch off ignition.
Lock all doors and trunk.
Connect an ohmmeter between relay base terminals 31 and 88.
Ohmmeter should indicate approx. 0 Ohm.
Connect ohmmeter between terminal 31 and, in sequence, relay base terminals 85A, 85B and 85R.
Ohmmeter should indicate infinite resistance at all connections.





Unlock all doors and trunk.
Connect ohmmeter between relay base terminals 31 and 86.
Ohmmeter should indicate infinite resistance. Connect ohmmeter between terminal 31 and, in sequence, relay base terminals 85A, 85B and 85R.
Ohmmeter should indicate approx. 0 Ohm at all connections.





If readings are correct:
Checking signal lead, deadlock switch D6.

If Incorrect reading at terminal 85A:
Checking of left front door operating switch C16.

If Incorrect reading at terminal 85B:
Checking of right front door operating switch C16.

If Incorrect reading at terminal 85R:
Checking of trunk operating switch C18.



D6: Checking Deadlock Switch Signal Lead

Switch off Ignition.





Reinstall central locking relay 2/7.
Reinstall deadlock relay 2/47.
Lock all the doors and trunk.





Remove central locking relay 2/7.
Connect voltmeter between relay base terminals AT and 31.





The voltmeter should Indicate approx. 0 V.





Connect ohmmeter between relay base terminals AT and 31 and lock one of the front doors by turning the door key slowly to about 90°; when the key has turned approx. 70° the ohmmeter should switch from infinite resistance to approx. 0 Ohm.




Ohmmeter should indicate approx. 0 Ohm when the door key is turned approx. 70°.





If reeding is correct:
Function check of central lock motors D8.

If reading is Incorrect:
Checking the deadlock switch D7.



D7: Checking The Deadlock Switch

Switch of ignition.
Remove all necessary front door panels.
Open central lock unit 14-pin connectors.
Connect ohmmeter between terminals 7 and 14 in the central locking unit 14-pin connector and lock one of the front doors by slowly turning the door key to 90°; when the door key is turned about 70° the ohmmeter should switch from infinite resistance to 0 Ohm.










If reading is correct:
Open-circuit or short circuit in deadlock switch signal lead between terminal 7 in central locking unit 14-pin connector and deadlock terminal in central locking relay base. Correct fault or replace deadlock switch signal lead. Reinstall central locking relay 2/7.

If reading is Incorrect:
Fault in central locking unit deadlock switch or central locking units wiring hamess. Correct fault or replace the entire central locking unit.
Reinstall central locking relay 2/7.



D8: Function Check Of Central Locking Motors

Switch oft ignition.
Reinstall central locking relay 2/7.
Unlock all doors.
Lock all the doors with the door key.
Remove deadlock relay 2/47.
Make a jumper wire between terminal 30 and MBL at the deadlock relay base for approx. 2 seconds.
The central locking units on the left side should now be deadlocked.





Make a jumper wire between terminals 30 and MBH at the deadlock relay base for approx. 2 seconds.
The central locking units on the right side should now be deadlocked.






If the central locking units are activated:
Replace the deadlock relay and carry out a function check of the central locking system.

If the central locking system does not function, check the interior courtesy lighting ground lead C21.
If the central locking units are not activated:
Check the central lock motor windings D9.



D9: Checking The Central Locking Motor Windings

Switch off ignition.
Reinstall the deadlock relay.
Remove all necessary door panels.
Unlock all doors.
Lock all doors with the door key.
Open the central locking unit 14-pin connector.
Connect an ohmmeter to:
Front doors between terminals 8 and 10 at the central locking unit 14-pin connector.
Rear doors between terminals 6 and 3 in the central locking unit 8-pin connector.
Ohmmeter should indicate 1-15 Ohm at all connections.







If reading is correct:
Open-circuit or short-circuit in signal lead between deadlock relay and central locking unit connector. Correct fault or replace faulty signal lead according to following specification:

Left front door: Signal lead between terminal MBL at deadlock relay base and terminal 8 in wiring harness 14-pin connector.

Right front door: Signal lead between terminal MBH at deadlock relay base and terminal 14 in wiring harness 14-pin connector.

Left rear door: Signal lead between terminal MBL in deadlock relay base and terminal 6 in wiring harness 8-pin connector.

Right rear door: Signal lead between terminal MBH at deadlock relay base and terminal 6 in wiring harness 8-pin connector.

If reading is Incorrect:
Fault in central lock motor wiring harness or winding. Correct fault or replace central locking motor.