Central Locking System Does Not Disengage Deadlock

NOTE: If the central locking system is stuck in the deadlock position, only the driver's door can be opened with the key.

E1: Function Check Of The Central Locking System

Switch off Ignition.
Remove fuse 6.
Check if fuse 6 in the fusebox is OK.






If the fuse has blown:
Temporary overload or fault in the central locking system. Replace the fuse and check lead 87 to the central locking motors E6.

If the fuse is OK:
Check voltage supply (30) to fuse 6 in the fusebox E2.



E2: Checking Voltage Supply (30) To Fuse 6 In The Fusebox

Switch off Ignition.
Connect a voltmeter between fuse holder position 11/6:1 for fuse 6 and ground. Voltmeter should indicate battery voltage.





If reading is correct:
Check the ground lead (31) to central locking relay E3.

If reading is incorrect
Open circuit or short-circuit to ground in voltage supply lead between fuse holder position 11/6:1 and battery 1/1.
Correct the fault or replace the voltage supply lead to fuse 6 in the fuse box. Reinstall fuse 6.



E3: Checking The Ground Lead (31) To The Central Locking Relay


Switch off ignition.





Remove central locking relay 2/7.
Connect an ohmmeter between terminal 31 at the central locking relay base and ground. Ohmmeter should indicate approx. 0 Ohm.





If reading is correct:
Check the voltage supply (30) to central locking relay E4.

If reading is incorrect:
Open-circuit or short circuit in ground lead between terminal 31 at relay base and ground point In the electrical distribution unit's power ground, 31/50. Correct the fault or replace the ground lead to the central locking relay. Reinstall central locking relay 2/7. Reinstall fuse 6.



E4: Checking Voltage Supply (30) To Central Locking Relay

Switch off ignition.





Reinstall fuse 6.
Connect a voltmeter between terminals relay base terminals 30 and 31. Voltmeter should Indicate battery voltage.





If reading is correct:
Check the ground lead (31) to deadlock relay E5.

If reading is incorrect:
Open-circuit or short-circuit to ground In voltage supply lead between relay base terminal 30 and fuseholder terminal 11/6:2 for fuse 6. Correct the fault or replace the voltage supply lead to the central locking relay. Reinstall central locking relay 2/7.




E5: Checking The Deadlock Relay Ground Lead (31)

Switch off Ignition.





Remove deadlock relay.
Connect an ohmmeter between terminal 31 at deadlock relay base and ground. Ohmmeter should indicate approx. 0 Ohm.





If reading is correct:
Check lead 87 to central locking motors E6.

If reading is incorrect:
Open circuit or short circuit in ground lead between terminal 31 at relay base and ground point, electrical distribution unit power ground 31/50. Correct fault or replace deadlock relay ground lead. Reinstall deadlock relay 2/47. Reinstall central locking relay 2/7.



E6: Checking Lead 87 To Central Locking Motors

Switch off ignition.





Connect an ohmmeter to relay base terminals 87 and 31.





Ohmmeter should indicate infinite resistance.
Connect a voltmeter to relay base terminals 87 and 31.
Voltmeter should indicate 0 V.





If readings are correct:
Check lead 88 to central locking motors E7.

1mIf readings are incorrect:
Short circuit in lead between terminal 87 at relay base and central locking motors. Correct fault or replace lead between relay base terminal 87 and central locking motors. Reinstall deadlock relay 2/47. Reinstall central locking relay 2/7.



E7: Checking Lead 88 To Central Locking Motors


Switch off ignition.





Connect an ohmmeter to terminals 88 and 31 at central locking relay base.





Ohmmeter should indicate infinite resistance.





Connect a voltmeter to terminals 88 and 31 at the central locking relay base. Voltmeter should indicate 0 V.





If reading is correct:
Check lead MBL to central locking motors E8.

If reading is incorrect:
Short circuit in lead between terminal 88 in relay base and central locking motors. Correct fault or replace lead between relay base terminal 88 and central locking motors. Reinstall deadlock relay 2/47. Reinstall central locking relay 2/7.



E8: Checking Lead MBL To Central Locking Motors

Switch off ignition.
Connect an ohmmeter between terminals MBL and 31 at deadlock relay base.





Ohmmeter should indicate infinite resistance.
Connect a voltmeter between terminals MBL and 31 at deadlock relay base. Voltmeter should indicate 0 V.





If reading is correct:
Check lead MBH to central locking motors E9

If reading is incorrect:
Short-circuit in lead between terminal MBL at relay base and central locking motors in left front and rear doors.
Correct fault or replace lead between terminal MBL at relay base and central locking motors. Reinstall deadlock relay 2/47. Reinstall central locking relay 2/7.



E9: Checking Lead MBH To Central Locking Motors

Switch off ignition.
Connect an ohmmeter between terminals MBH and 31 at deadlock relay base.





Ohmmeter should Indicate Infinite resistance.
Connect a voltmeter between terminals MBH and 31 at deadlock relay base. Voltmeter should indicate 0 V.






If reading is correct:
Check the central locking motors windings E10.

If readings are incorrect:
Short circuit in lead between MBH at relay base and central locking motors in right front and rear doors. Correct fault or replace lead between relay base MBH and central locking motors. Reinstall deadlock relay 2/47. Reinstall central locking relay 2/7.


E10: Checking Central Locking Motor Windings.

Switch off ignition.




Lock all doors.





Checking the central locking motors, left side:
Connect an ohmmeter between terminal MBL at deadlock relay base and terminal 88 at central locking relay base.
Checking the central locking motors, right side:





Connect an ohmmeter between terminal MBH at deadlock relay base and terminal 88 at central locking relay base.
Ohmmeter should indicate 1-15 Ohm

If ohmmeter Indicates 1-15 Ohm:
Check deadlock relay E11.

If ohmmeter Indicates 0 W:
Short circuit in lead between central locking motors and deadlock delay terminal MBL (fault on left side) or MBH (fault on right side).

Correct fault or replace leads between central locking motors and terminal MBL or MBH at deadlock relay base. Reinstall deadlock relay 2/47.
Reinstall central locking relay 2/7.

If ohmmeter Indicates Infinite resistance:
Checking central locking motors winding E13.


E11: Checking The Deadlock Relay

Switch off Ignition.





Connect an ohmmeter between terminals MBH and 31 at deadlock relay.
Ohmmeter should indicate 0 Ohm.





If reading is correct:
Function check of central locking motors E12.

If reading is incorrect:
Replace deadlock relay.
Replace central locking relay.
Function check of central locking system.



E12: Function Check Of Central Locking Motors

Switch off ignition.
Reinstall deadlock relay.
Function check of unlocking.
Connect ground to terminal 87 by bridging from terminal 31 at central locking relay base.





Connect battery voltage to terminal 88 for approx. 2 seconds by bridging from terminal 30 at central locking relay base.
Central lock units should now unlock.

If all central lock units become unlocked:
Check unlocking signal leads E14.

If one central locking unit does not unlock:
Check central locking motor's winding E13.


NOTE: It only the rear doors stick in deadlock position, first perform operation F3, followed by E13 if the fault symptom persists.



E13: Checking Central Locking Motor Winding

Switch off ignition.
Remove deadlock relay.
Remove necessary door panels.
Lock all doors.
Open central locking unit's 14-pin or 8-pin connector.
Connect an ohmmeter to:
Front doors between terminal 8 and 10 at central locking unit's 14-pin connector.
Ohmmeter should indicate 1-15 Ohm.
Rear doors between terminals 3 and 6 at central locking unit's 8-pin connector.
Ohmmeter should indicate 1-15 Ohm.






If reading is correct:
Checking unlocking signal leads E14.

If reading is incorrect:
Open circuit or short circuit in central locking unit's wiring harness or central locking motor's winding at central locking unit, where reading is incorrect.

Correct fault or replace faulty wiring harness or central locking motor.
Replace central locking relay 217. Reinstall deadlock relay 2/47.



E14: Checking Unlocking Signal Leads

Switch off ignition.
Lock all doors.
Connect an ohmmeter between terminals 31 and, in sequence, terminals 85A, 85B and 85R at central locking relay base.
Ohmmeter should indicate infinite resistance in all readings.






If readings are correct:
Check ground lead, interior courtesy lighting C21.
Reinstall deadlock relay 2/47.

If incorrect reading at terminal 85A:
Check operating switch, left front door C16.
Reinstall deadlock relay 2/47.

If incorrect reading at terminal 85B:
Check operating switch, right front door C16.
Reinstall deadlock relay 2/47.

If incorrect reading at terminal 85R:
Check trunk operating switch C18.
Reinstall deadlock relay 2/47.