Central Locking System Inoperable By Remote Control

NOTE: Before starting fault-tracing, try the central locking system with all transmitters to make sure that the fault is not in one particular transmitter. If the fault is localized to one transmitter then start fault tracing at G9.


G1 Checking Fuses

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





If fuses have blown:
Temporary overload or fault in central locking system. Install new fuse and check if central locking system works manually using the keys as per step G4.

If fuses are intact:
Check supply (30) to fuse 15 in the fusebox as per step G2.


G2 Checking Supply (30) To Fuse 15 In The Central Fuse Module

Switch ignition on.
Connect a voltmeter between fuseholder position 11/15:1 for fuse 15 and ground. Voltmeter should read battery voltage.





If reading is correct:
Check supply (x) to fuse 32 in the fusebox as per step G3.

If reading is incorrect:
There is an open-circuit or short-circuit in the supply lead between fuseholder position 11/15:1 and battery 1/1. Correct fault or install new supply lead from fuseholder position 11/15:1 to battery 1/1. Replace fuses.



G3 Checking Supply (x) To Fuse 32 In The Fusebox

Switch ignition off.
Connect a voltmeter between fuseholder position 11/32:1 for fuse 32 and ground. Voltmeter should read approximately 0 Volts.





Turn ignition to position I.
Connect a voltmeter between fuseholder position 11/32:1 for fuse 32 and ground. Voltmeter should read battery voltage.





If reading is correct:
See if central locking system works manually using the keys as per step G4.

If reading is incorrect:
There is an open-circuit or short-circuit in the supply lead between fuseholder position 11/32:1 and battery 3/1. Correct fault or install new supply lead from fuseholder position 11/32:1 to battery. Replace fuses.



G4 Checking If Central Locking System Works Manually Using The Keys

Switch ignition off.




Replace fuses.
Close all doors.
See if you can operate the central locking system using the keys from either front door or the trunk/tailgate.





If the central locking system operates:
Check receiver module ground lead as per step G5.

If central locking system is inoperable:
Carry out fault-tracing as per CENTRAL LOCKING SYSTEM COMPLETELY INOPERABLE.



G5 Checking Receiver Module Ground Lead

Switch ignition off.
Undo receiver module 5-pin connector.





Connect an ohmmeter between position 1 on the cable harness 5-pin connector and ground. Ohmmeter should read approximately 0 ohm.





If reading is correct:
Check supply lead (30) to receiver module as per step G6.

If reading is incorrect:
Open-circuit or short-circuit to 12 Volt in receiver module ground lead between position 1 on cable harness 5-pin connector and electrical panel output ground point 31/50. Correct fault or install new receiver module ground lead.



G6 Checking Supply (30) To Receiver Module

Switch ignition off.
Undo receiver module 5-pin connector.





Connect a voltmeter between positions 5 and 1 on the cable harness 5-pin connector. Voltmeter should read battery voltage.





If reading is correct:
Check ignition supply (x) to receiver module as per step G7.

If reading is incorrect:
Open-circuit or short-circuit to ground in receiver module supply lead between position 5 on cable harness 5-pin connector and fuseholder position 11/15:2 for fuse 15. Correct fault or install new receiver module supply lead.



G7 Checking Ignition Supply (x) To Receiver Module

Switch ignition off.
Undo receiver module 5-pin connector.





Connect a voltmeter between positions 1 and 4 on the cable harness 5-pin connector. Voltmeter should read approximately 0 Volts.





Ignition in position I.





Connect a voltmeter between positions 1 and 4 on the cable harness 5-pin connector. Voltmeter should read battery voltage.






If reading is correct:
Check signal lead to central locking relay as per step G8.

If reading is incorrect:
There is an open-circuit or short-circuit in the ignition supply lead between fuseholder position 11/32:2 for fuse 32 and position 4 in the cable harness 5-pin connector. Correct fault or install new ignition supply lead to receiver module.



G8 Checking Signal Lead To Central Locking Relay

Switch ignition off.
Undo receiver module 5-pin connector.
Remove central locking relay 205/206.





Connect an ohmmeter between position 3 on the cable harness 5-pin connector and position ATR on the relay plinth.









Ohmmeter should read approximately 0 ohm.
Connect an ohmmeter between positions 1 and 3 on the cable harness 5-pin connector. Ohmmeter should read infinite resistance.





Connect a voltmeter between positi0ns 1 and 3 on the cable harness 5-pin connector. Voltmeter should read approximately 0 Volts.





If reading is correct:
Check transmitter battery as per step G9.

If reading is incorrect:
Open-circuit or short-circuit in receiver module signal lead between position 3 on cable harness 5-pin connector and position ATR on relay plinth. Correct fault or install new receiver module signal lead. Replace central locking relay 2/7.



G9 Checking Transmitter Battery

Switch ignition off.
Connect receiver module 5-pin connector.
Replace central locking relay 2/7.

NOTE: Avoid touching the transmitter battery contact surfaces (+/- contacts). If you touch the surfaces accidentally, clean them with a degreasing agent before replacing in the transmitter.

Remove transmitter battery cover and take out battery.




Connect a voltmeter between the battery contact surfaces (+/- contacts).
The voltmeter reading should be at least 2.8 Volts.

If reading is correct:
Replace battery and carry out programming of transmitter key code to receiver module as per step G10.

If reading is incorrect:
Replace battery. Test transmitter by pressing buttons LOCK and UNLOCK.
Check that central locking system works. If central locking system does not operate, carry out programming transmitter key code to receiver module as per step G10.



G10 Programming Transmitter Key Code To Receiver Module


NOTE: The transmitter key codes are preprogrammed in the receiver module when the car is delivered. If uncertain about the key code programming reprogram the key codes. If the correct key code is programmed, continue fault tracing at G11.


Switch ignition off.
Reprogram the receiver module as in the REMOTE CONTROL OF CENTRAL LOCKING SYSTEM, 2 STEP IN DESCRIPTION AND OPERATION. Test transmitter by pressing LOCK and UNLOCK buttons.





If the central locking modules do not operate:
Check receiver module signal pulse as per step G11.



G11 Checking Receiver Module Signal Pulse

Switch Ignition off.





Remove central locking relay 205/206.





Connect a voltmeter to positions ATR and 31 on relay plinth.





Press the LOCK button on the transmitter and see if there is a reading on the voltmeter. The voltmeter should give a reading (showing pulse more than 0 Volts).





If reading is correct:
Test transmitter by pressing buttons LOCK and UNLOCK. Check that central locking system works. If central locking system does not operate, check receiver module as per step G13.

If reading is incorrect:
Check transmitter as per step G12.



G12 Checking Transmitter

Switch ignition off.
Replace central locking relay 2/7.
Install new transmitter.






Reprogram the receiver module as in the REMOTE CONTROL OF CENTRAL LOCKING SYSTEM, 2 STEP IN DESCRIPTION AND OPERATION. Test transmitter by pressing LOCK and UNLOCK buttons.

If the central locking system does not operate:
Check receiver module as per step G13.

If central locking system operates:
The replaced transmitter was faulty. Replace the remaining faulty transmitters and return to operation G12.

NOTE: Program code in all transmitters to be used.


G13 Checking Receiver Module

Switch ignition off.
Install new receiver module.
Reprogram the receiver module as in the REMOTE CONTROL OF CENTRAL LOCKING SYSTEM, 2 STEP IN DESCRIPTION AND OPERATION. Test transmitter by pressing LOCK and UNLOCK buttons.





If central locking system operates:
The receiver module removed was faulty. Use the new receiver module. Go back to step G12 and test all 'old' transmitters to see if they work with the new receiver module.

If the central locking system does not operate:
Check interior lighting ground lead as per C21.