Central Locking System Inoperable By Remote Control

NOTE: Prior to fault tracing, the central locking system should be tested with all transmitters (remote controls) to ensure that the fault is not due to an individual transmitter. Fault tracing a transmitter begins at operation J9.

J1: Checking fuses.

Switch off ignition.
Remove fuses 15 and 32.
Check if fuses 14 and 32 in fusebox are intact.





If fuses are faulty:
Temporary overload or fault in central locking system. Replace fuse and perform manual operation check of central locking system with key as per J4.

If fuses are intact:
Check voltage supply (30) to fuse 15 in the fusebox as per J2.


J2: Checking Supply (30) To Fuse 15 In Fusebox.

Switch on ignition.
Connect a voltmeter between fuseholder terminal 11/15:1 (fuse 15) and ground. Voltmeter should indicate battery voltage.





If reading is correct:
Check voltage supply (x) to fuse 32 in fuseholder as per J3.

If reading is incorrect:
Open-circuit or short-circuit in supply lead between fuseholder terminal 11/15:1 and battery 1/1. Correct fault or replace voltage supply lead from fuse-holder terminal 11/15:1 to battery 1/1. Reinstall fuses.



J3: Checking Voltage Supply (x) To Fuse 32 In Fusebox.

Switch off ignition.
Connect a voltmeter between fuse holder terminal 11/32:1 for fuse 32 and ground. Voltmeter should indicate approx. 0 V.





Turn ignition key to position I
Connect a voltmeter between fuse holder terminal 11/32:1 for fuse 32 and ground. Voltmeter should indicate battery voltage.





If readings are correct:
Check manual operation of central locking system with key as per J4.

If readings are incorrect:
Open circuit or short circuit in voltage supply lead between fuseholder terminal 11/32:1 and ignition switch 3/1.
Correct fault or replace supply voltage lead from fuse holder terminal 11/32:1 to ignition switch. Reinstall fuses.



J4: Checking Manual Operation Of Central Locking System With Key.

Switch off ignition.





Reinstall fuses.
Close all doors.
Check whether central locking system can be operated manually by key from both front doors and trunk.





If system can be operated:
Check receiver ground lead as per J5.

If central locking system cannot be operated:
Carry out fault tracing as described in the section entitled Central Locking System Completely Inoperable.


J5: Checking Receiver Ground Lead

Switch off ignition.
Open receiver 5-pin connector.
Connect an ohmmeter between terminal 1 in wiring harness 5-pin connector and ground.
Ohmmeter should indicate approx. 0 Ohm.





If reading is correct OK:
Check voltage supply (30) to receiver as per J6.

If reading is Incorrect:
Open circuit or short circuit to supply in receiver ground lead between terminal 1 in wiring harness 5-pin connector and electrical distribution power ground terminal 31/50. Correct fault or replace receiver ground lead.




J6: Checking Receiver Supply (30)

Switch off ignition.
Open receiver 5-pin connector.
Connect a voltmeter across terminals 5 and 1 in wiring harness 5-pin connector.
Voltmeter should Indicate battery voltage.





If reading is correct:
Check trigger supply (x) to receiver as per J7.

If reading is Incorrect:
Open-circuit or short-circuit to ground in receiver supply lead between terminal 5 in wiring harness 5 in connector and fuseholder terminal 11/15:2 (fuse 15). Correct fault or replace receiver supply lead.




J7: Checking Trigger Supply (x) To Receiver.

Open receiver 5-pin connector.
Switch off ignition.
Connect a voltmeter across terminals 1 and 4 in wiring harness 5-pin connector. Voltmeter should Indicate approx. 0 V.





Turn ignition key to position I.
Connect a voltmeter across terminals 1 and 4 in wiring harness 5-pin connector. Voltmeter should indicate battery voltage.





If reading is correct:
Check signal lead to central locking relay as per J8.

If reading is Incorrect:
Open circuit or short circuit in trigger supply lead between fuseholder terminal 11/32:2 (fuse 32) and terminal 4 In wiring harness 5-pin connector. Correct fault or replace trigger supply lead to receiver.



J8: Checking Signal Lead To Central Locking Relay

Switch off ignition.





Open receiver 5-pin connector.
Remove central locking relay 2/7.
Connect an ohmmeter between terminal 3 in wiring harness 5-pin connector and relay base terminal ATR.
Ohmmeter should indicate approx. 0 Ohm.





Connect an ohmmeter between terminals 1 and 3 in wiring harness 5-pin connector. Ohmmeter should indicate infinite resistance.





Connect a voltmeter across terminals 1 and 3 in wiring harness 5-pin connector. Voltmeter should indicate approx. 0 V.





If readings are correct:
Check transmitter battery as per J9.

If readings are Incorrect:
Open-circuit or short-circuit in receiver signal lead between terminal 3 in wiring harness 5-pin connector and relay base terminal ATR. Correct fault or replace receiver signal lead. Reinstall central locking relay 2/7.


NOTE: Battery is sensitive to contamination of contact surfaces (+/- poles). After contact with fingers, clean contact surfaces with degreasing agent before re-installing.


J9: Checking Transmitter Battery

Switch off Ignition.
Reconnect receiver 5-pin connector.
Reinstall central locking relay 2/7.
Remove transmitter battery cover and remove battery.





Connect a voltmeter to battery contact surfaces (+/- poles).
Voltmeter should indicate min. 2.8 V.


If reading is correct:
Reinstall battery and program receiver with transmitter key code as per J10.

If reading is Incorrect:
Replace battery. Test transmitter by pressing "LOCK" and "UNLOCK" buttons. Check if central locking system is activated. If system is not activated, program receiver unit with transmitter key code as per J10.


J10: Programming Receiver With Transmitter Key Code

NOTE: Receiver is programmed with transmitter key code when car is delivered. Repeat programming procedure If in doubt as to whether this has been carried out. If the correct key code has been entered, continue fault tracing as per J11.


Switch off Ignition.
Reprogram receiver unit See Antitheft Description and Operation. Test the transmitter by pressing the "LOCK" and "UNLOCK" buttons. Check if central locking system is activated.





If central locking system is not activated:
Check receiver signal pulse as per J11.


J11: Checking Receiver Signal Pulse

Switch off ignition.





Remove central locking relay 2/7. Connect a voltmeter across relay base terminals ATR and 31. Press transmitter "LOCK" button and check voltmeter for reading. Voltmeter should give a reading (i.e. read more than 0 V).





If reading is correct:
Replace central locking relay and test transmitter by pressing "LOCK" and "UNLOCK" buttons. Check it central locking system is activated. If central locking system is not activated, check receiver unit as per J13.

If reading is Incorrect:
Check transmitter as per J12.


J12: Checking Transmitter

Switch oft Ignition.
Reinstall central locking relay 2/7.
Replace transmitter.
Reprogram receiver unit as described in Antitheft Description and Operation.





Test transmitter by pressing "LOCK" and "UNLOCK" buttons.
Check if central locking system is activated.

If central locking system is not activated: Check receiver unit as per J13.


J13: Checking receiver unit
Switch off ignition.
Replace receiver unit.
Reprogram receiver unit as described in Antitheft Description and Operation.





Test receiver unit by pressing transmitter "LOCK" and "UNLOCK" buttons. Check if central locking system is activated.

If central locking system is net activated:
Check interior courtesy light ground lead as per C21.