Part 2
Checking door locking function (Continued)
Replacing components
Replace the lock unit as per Lock mechanism front side door, replacing Lock Mechanism Front Side Door, Replacing.
Were there any faults?
Yes - Fault Found
No - Replacing components
------------------------
Replacing components
Replace the control module as per Relay/fuse box cargo compartment/Rear electronic module (REM), replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing.
Continue - Fault Found
------------------------
FAULT FOUND - Fault Found
-------------------------------------------------
Left rear door
Checking the left rear door
Check
Is the lock for the other back door not functioning?
Yes - Checking fuses
No - Replacing the component
------------------------
Replacing the component
Replace the relays for locking (2/111) and unlocking (2/112) in the integrated relay / fusebox in the cargo compartment. At the same time, check the relay base switches for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Other information
- To access the integrated relay / fusebox in the cargo compartment, see Relay/fuse box cargo compartment/Rear electronic module (REM), replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing.
Was a fault detected?
Yes - Fault Found
No - Circuit test
------------------------
Circuit test
The fault is caused by an open-circuit in one of the relay circuits in the lock unit. To determine in which circuit the fault is:
Disconnect the connector at the lock unit.
Check the switches for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Measure the resistance between terminals terminal #4 and #6 on the cable connector.
Other information
- To access and replace the lock unit, see Lock mechanism Lock Mechanism.
The ohmmeter should read 0ohm.
OK - Checking the component
Not OK - Circuit test (cont.)
------------------------
Circuit test (cont.)
Measure the resistance between terminal #4 and ground and between terminal #6 and ground on the cable connector.
The ohmmeter should read 0 ohm.
1. The ohmmeter displays a fault between terminal #4 and ground.
2. The ohmmeter displays a fault between terminal #6 and ground.
Select an alternative that corresponds to the above.
1 - Checking the unlocking relay circuit
2 - Checking locking relay circuit
------------------------
Checking locking relay circuit
Remove the locking relay (2/111).
Check the cable between terminal #4 the cable connector and terminal #3 on the relay base for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
If a fault is detected, check in particular the 2 intermediate connectors in the cable harness for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Remedy as necessary.
If no fault is detected, measure the resistance between terminal #4 in the relay base and ground.
The ohmmeter should read 0 ohm.
If the resistance is incorrect, replace the rear electronic module.
Other information
- To access and replace the rear electronic module, see Relay/fuse box cargo compartment/Rear electronic module (REM), replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing.
Continue - Fault Found
------------------------
Checking the unlocking relay circuit
Remove the unlocking relay (2/112).
Check the cable between terminal #6 the cable connector and terminal #3 on the relay base for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
If a fault is detected, check in particular the 2 intermediate connectors in the cable harness for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Remedy as necessary.
If no fault is detected, measure the resistance between terminal #4 in the relay base and ground.
The ohmmeter should read 0 ohm.
If the resistance is incorrect, replace the rear electronic module.
Other information
- To access and replace the rear electronic module, see Relay/fuse box cargo compartment/Rear electronic module (REM), replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing.
Continue - Fault Found
------------------------
Checking the component
Measure the resistance between pins terminals #4 and #6 on the chassis switch lock unit.
The ohmmeter should read 5 ohm.
If the resistance is incorrect, replace the lock unit.
Other information
- To access the rear electronic module, see Relay/fuse box cargo compartment/Rear electronic module (REM), replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing.
- To access and replace the lock unit, see Lock mechanism Lock Mechanism.
- For further information about signals and other values, see Signal specification Pinout Values and Diagnostic Parameters.
Was a fault detected?
Yes - Fault Found
No - Checking relay power supply
------------------------
Checking relay power supply
Remove the locking relay (2/111).
Measure the voltage between terminal #5 in the relay base and ground.
The voltmeter should read battery voltage.
Hint: If the value is OK but the fault remains, connect the connector to the lock module between terminals #3 and #5 in the relay base to force a supply to the locking motor when continuing to take measurements.
Other information
- To access the rear electronic module, see Relay/fuse box cargo compartment/Rear electronic module (REM), replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing.
Does the voltmeter read battery voltage?
Yes - Fault Found
No - Checking fuses
------------------------
Checking fuses
Remove fuse 11D/8 in the cargo compartment fusebox.
Check that fuse 11D/8 is intact and check for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Other information
- To access the rear electronic module, see Relay/fuse box cargo compartment/Rear electronic module (REM), replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing.
Is the fuse intact?
Yes - Checking for an open-circuit
No - Checking for a short-circuit
------------------------
Checking for an open-circuit
Remove relay 2/111 in the rear electronic module. Fault-trace the cable between the secondary side of the fuse holder (left) and terminal #5 in the relay base for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Other information
- To access the rear electronic module, see Relay/fuse box cargo compartment/Rear electronic module (REM), replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing.
Continue - Fault Found
------------------------
Checking for a short-circuit
Measure the resistance between the fuse holder secondary side (left) and ground.
The ohmmeter should read infinite resistance.
If the value is correct, replace the fuse.
If the value is incorrect, fault-trace all affected relay circuits for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Hint: Replace fuse.
If the fuse blows immediately the short-circuit is in the relay power cable.
If the fuse blows when the relevant relay is activated, the short-circuit is in the component power supply cable
The relay circuits affected are from relays 2/111, 2/112, 2/113, 2/114, 2/115, 2/56, 2/59 and 2/67.
Other information
- To access the rear electronic module, see Relay/fuse box cargo compartment/Rear electronic module (REM), replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing.
Continue - Fault Found
------------------------
FAULT FOUND - Fault Found
-------------------------------------------------
Right rear door
Checking the right rear door
Check
Is the lock for the other back door not functioning?
Yes - Checking fuses
No - Replacing the component
------------------------
Replacing the component
Replace the relays for locking (2/113) and unlocking (2/114) in the integrated relay / fusebox in the cargo compartment. At the same time, check the relay base switches for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Other information
- To access the integrated relay / fusebox in the cargo compartment, see Relay/fuse box cargo compartment/Rear electronic module (REM), replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing.
Was a fault detected?
Yes - Fault Found
No - Circuit test
------------------------
Circuit test
The fault is caused by an open-circuit in one of the relay circuits in the lock unit. To determine in which circuit the fault is:
Disconnect the connector at the lock unit.
Check the switches for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Measure the resistance between terminals terminal #4 and #6 on the cable connector.
Other information
- To access and replace the lock unit, see Lock mechanism Lock Mechanism.
The ohmmeter should read 0ohm.
OK - Checking the component
Not OK - Circuit test (cont.)
------------------------
Circuit test (cont.)
Measure the resistance between terminal #4 and ground and between terminal #6 and ground on the cable connector.
The ohmmeter should read 0 ohm.
1. The ohmmeter displays a fault between terminal #4 and ground.
2. The ohmmeter displays a fault between terminal #6 and ground.
Select an alternative that corresponds to the above.
1 - Checking the unlocking relay circuit
2 - Checking locking relay circuit
------------------------
Checking locking relay circuit
Remove the locking relay (2/113).
Check the cable between terminal #4 the cable connector and terminal #3 on the relay base for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
If a fault is detected, check in particular the 2 intermediate connectors in the cable harness for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Remedy as necessary.
If no fault is detected, measure the resistance between terminal #4 in the relay base and ground.
The ohmmeter should read 0 ohm.
If the resistance is incorrect, replace the rear electronic module.
Other information
- To access and replace the rear electronic module, see Relay/fuse box cargo compartment/Rear electronic module (REM), replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing.
Continue - Fault Found
------------------------
Checking the unlocking relay circuit
Remove the unlocking relay (2/114).
Check the cable between terminal #6 the cable connector and terminal #3 on the relay base for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
If a fault is detected, check in particular the 2 intermediate connectors in the cable harness for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Remedy as necessary.
If no fault is detected, measure the resistance between terminal #4 in the relay base and ground.
The ohmmeter should read 0 ohm.
If the resistance is incorrect, replace the rear electronic module.
Other information
- To access and replace the rear electronic module, see Relay/fuse box cargo compartment/Rear electronic module (REM), replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing.
Continue - Fault Found
------------------------
Checking the component
Measure the resistance between pins terminals #4 and #6 on the chassis switch lock unit.
The ohmmeter should read 5 ohm.
If the resistance is incorrect, replace the lock unit.
Other information
- To access the rear electronic module, see Relay/fuse box cargo compartment/Rear electronic module (REM), replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing.
- To access and replace the lock unit, see Lock mechanism Lock Mechanism.
- For further information about signals and other values, see Signal specification Pinout Values and Diagnostic Parameters.
Was a fault detected?
Yes - Fault Found
No - Checking relay power supply
------------------------
Checking relay power supply
Remove the locking relay (2/113).
Measure the voltage between terminal #5 in the relay base and ground.
The voltmeter should read battery voltage.
Hint: If the value is OK but the fault remains, connect the connector to the lock module between terminals #3 and #5 in the relay base to force a supply to the locking motor when continuing to take measurements.
Other information
- To access the integrated relay / fusebox in the cargo compartment, see Relay/fuse box cargo compartment/Rear electronic module (REM), replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing.
Does the voltmeter read battery voltage?
Yes - Fault Found
No - Checking fuses
------------------------
Checking fuses
Remove fuse 11D/8 in the cargo compartment fusebox.
Check that fuse 11D/8 is intact and check for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Other information
- To access the integrated relay / fusebox in the cargo compartment, see Relay/fuse box cargo compartment/Rear electronic module (REM), replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing.
Is the fuse intact?
Yes - Checking for an open-circuit
No - Checking for a short-circuit
------------------------
Checking for an open-circuit
Remove relay 2/113 from the integrated relay / fusebox in the cargo compartment. Fault-trace the cable between the secondary side of the fuse holder (left) and terminal #5 in the relay base for an open-circuit according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Other information
- To access the integrated relay / fusebox in the cargo compartment, see Relay/fuse box cargo compartment/Rear electronic module (REM), replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing.
Continue - Fault Found
------------------------
Checking for a short-circuit
Measure the resistance between the fuse holder secondary side (left) and ground.
The ohmmeter should read infinite resistance.
If the value is correct, replace the fuse.
If the value is incorrect, fault-trace all affected relay circuits for a short-circuit to ground according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault.
Note! If the value is correct the fault may be intermittent.
Hint: Replace fuse.
If the fuse blows immediately the short-circuit is in the relay power cable.
If the fuse blows when the relevant relay is activated, the short-circuit is in the component power supply cable
The relay circuits affected are from relays 2/111, 2/112, 2/113, 2/114, 2/115, 2/56, 2/59 and 2/67.
Other information
- To access the integrated relay / fusebox in the cargo compartment, see Relay/fuse box cargo compartment/Rear electronic module (REM), replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing.
Continue - Fault Found
------------------------
FAULT FOUND - Fault Found
-------------------------------------------------