Part 2

Checking the door locking function (Continued)

Checking the cables for the lock motor
Check the connectors for the door control module and lock unit. Check for contact resistance and oxidation.
Check the cable between door control module connector terminal #B2 and lock unit connector terminal #8. Check for an open-circuit.
Check the cable between door control module connector terminal #B6 and lock unit connector terminal #7. Check for an open-circuit.

Other information
- To access and replace the rear electronic module (REM), see Relay/fuse box cargo compartment/Rear electronic module (REM), replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing
- Checking wiring and terminals Checking Wiring And Terminals.





Was a fault detected?

Yes - Fault Found

No - Replacing the component

------------------------

Replacing the component
Replace the lock unit. See Lock mechanism front side door, replacing Lock Mechanism Front Side Door, Replacing.

Was a fault detected?

Yes - Fault Found

No - Replacing the component

------------------------

Replacing the component
Replace the rear electronic module (REM). 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

-------------------------------------------------

Left rear door




Checking the left rear door

Check

Is the lock for the right rear door also not functioning?

Yes - Replacing the component

No - Circuit test

------------------------

Replacing the component
Replace the relays for locking and unlocking in the integrated relay / fusebox in the cargo compartment. Check the relay base switches. Check for contact resistance and oxidation.

Other information
- To access the integrated relay / fusebox in the cargo compartment, see Integrated relay / fusebox cargo compartment / rear electronic module, replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing
- For further information about relays, see wiring diagram
- Checking wiring and terminals Checking Wiring And Terminals.









Was a fault detected?

Yes - Fault Found

No - Checking fuses

------------------------

Circuit test
The fault indicates an open-circuit in the lock unit circuit.
Disconnect the connector at the lock unit.
Check the connectors for contact resistance and oxidation.
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 rear side door, replacing Lock Mechanism Rear Side Door, Replacing
- Checking wiring and terminals Checking Wiring And Terminals.








ohms
The ohmmeter should read 0.

OK - Checking the component

Not OK - Circuit test continued

------------------------

Circuit test continued
Measure the resistance between terminal #4 and ground and between terminal #6 and ground on the cable connector.
The ohmmeter should read 0 ohms.
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 locking relay circuit

2 - Checking the unlocking relay circuit

------------------------

Checking the unlocking relay circuit
Remove the relay for unlocking the left rear door.
Check the cable between terminal #4 the cable and connector and terminal #3 on the relay base. Check for an open-circuit.
If a fault is detected, check in particular the 2 intermediate connectors in the cable harness. Check for contact resistance and oxidation.
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 ohms.
If the resistance is incorrect, replace the rear electronic module (REM).

Other information
- To access and replace the rear electronic module (REM), see Integrated relay / fusebox cargo compartment / rear electronic module, replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing
- For further information about relays, see wiring diagram
- Checking wiring and terminals Checking Wiring And Terminals.













Continue - Fault Found

------------------------

Checking the locking relay circuit
Remove the central locking relay.
Check the cable between terminal #6 the cable and connector and terminal #3 on the relay base. Check for an open-circuit.
If a fault is detected, check in particular the 2 intermediate connectors in the cable harness. Check for contact resistance and oxidation.
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 ohms.
If the resistance is incorrect, replace the rear electronic module (REM).

Other information
- To access and replace the rear electronic module (REM), see Integrated relay / fusebox cargo compartment / rear electronic module, replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing
- For further information about relays, see wiring diagram
- Checking wiring and terminals Checking Wiring And Terminals.













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 ohms.
If the resistance is incorrect, replace the lock unit.
Remedy as necessary.

Other information
- To access the rear electronic module (REM), see Integrated relay / fusebox cargo compartment / rear electronic module, replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing
- To access and replace the lock unit, see Lock mechanism rear side door, replacing Lock Mechanism Rear Side Door, Replacing
- 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 for a short-circuit

------------------------

Checking fuses
Remove fuse 11D/8 from the cargo compartment fusebox.
Check that fuse 11D/8 is intact. Check for contact resistance and oxidation.

Other information
- To access the rear electronic module (REM), see Integrated relay / fusebox cargo compartment / rear electronic module, replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing
- For information about fuses, see the wiring diagram
- Checking wiring and terminals Checking Wiring And Terminals.









Is the fuse intact?

Yes - Checking for an open-circuit

No - Checking for a short-circuit

------------------------

Checking for an open-circuit
Remove the central locking relay in the rear electronic module (REM) and fault-trace the cable between the fuse holder secondary side (left) and terminal #5 in the relay base. Check for an open-circuit.

Other information
- To access the rear electronic module (REM), see Integrated relay / fusebox cargo compartment / rear electronic module, replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing
- Checking wiring and terminals Checking Wiring And Terminals.









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.
Fault-trace all affected relay circuits for a short-circuit to ground if the value is incorrect.

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 that are affected belong to the central locking relay, unlocking rear left door relay and unlocking rear right door relay.

Other information
- To access the rear electronic module (REM), see Integrated relay / fusebox cargo compartment / rear electronic module, replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing
- For further information about the relays and fuses, see the Wiring Diagram
- Checking wiring and terminals Checking Wiring And Terminals.









Continue - Fault Found

------------------------

FAULT FOUND - Fault Found

-------------------------------------------------

Right rear door




Checking the right rear door

Check

Is the lock for the left rear door also not functioning?

Yes - Replacing the component

No - Circuit test

------------------------

Replacing the component
Replace the relays for locking and unlocking in the integrated relay / fusebox in the cargo compartment. Check the relay base switches. Check for contact resistance and oxidation.

Other information
- To access the integrated relay / fusebox in the cargo compartment, see Integrated relay / fusebox cargo compartment / rear electronic module, replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing
- For further information about relays, see wiring diagram
- Checking wiring and terminals Checking Wiring And Terminals.









Was a fault detected?

Yes - Fault Found

No - Checking fuses

------------------------

Circuit test
The fault indicates an open-circuit in the lock unit circuit.
Disconnect the connector at the lock unit.
Check the connectors for contact resistance and oxidation.
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 rear side door, replacing Lock Mechanism Rear Side Door, Replacing
- Checking wiring and terminals Checking Wiring And Terminals.








ohms
The ohmmeter should read 0.

OK - Checking the component

Not OK - Circuit test continued

------------------------

Circuit test continued
Measure the resistance between terminal #4 and ground and between terminal #6 and ground on the cable connector.
The ohmmeter should read 0 ohms.
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 locking relay circuit

2 - Checking the unlocking relay circuit

------------------------

Checking the unlocking relay circuit
Remove the relay for unlocking the right rear door.
Check the cable between terminal #4 the cable and connector and terminal #3 on the relay base. Check for an open-circuit.
If a fault is detected, check in particular the 2 intermediate connectors in the cable harness. Check for contact resistance and oxidation.
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 ohms.
If the resistance is incorrect, replace the rear electronic module (REM).

Other information
- To access and replace the rear electronic module (REM), see Integrated relay / fusebox cargo compartment / rear electronic module, replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing
- For further information about relays, see wiring diagram
- Checking wiring and terminals Checking Wiring And Terminals.













Continue - Fault Found

------------------------

Checking the locking relay circuit
Remove the central locking relay.
Check the cable between terminal #6 the cable and connector and terminal #3 on the relay base. Check for an open-circuit.
If a fault is detected, check in particular the 2 intermediate connectors in the cable harness. Check for contact resistance and oxidation.
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 ohms.
If the resistance is incorrect, replace the rear electronic module (REM).

Other information
- To access and replace the rear electronic module (REM), see Integrated relay / fusebox cargo compartment / rear electronic module, replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing
- For further information about relays, see wiring diagram
- Checking wiring and terminals Checking Wiring And Terminals.













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 ohms.
If the resistance is incorrect, replace the lock unit.
Remedy as necessary.

Other information
- To access the rear electronic module (REM), see Integrated relay / fusebox cargo compartment / rear electronic module, replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing
- To access and replace the lock unit, see Lock mechanism rear side door, replacing Lock Mechanism Rear Side Door, Replacing
- 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 for a short-circuit

------------------------

Checking fuses
Remove fuse 11D/8 from the cargo compartment fusebox.
Check that fuse 11D/8 is intact. Check for contact resistance and oxidation.

Other information
- To access the rear electronic module (REM), see Integrated relay / fusebox cargo compartment / rear electronic module, replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing
- For information about fuses, see the wiring diagram
- Checking wiring and terminals Checking Wiring And Terminals.









Is the fuse intact?

Yes - Checking for an open-circuit

No - Checking for a short-circuit

------------------------

Checking for an open-circuit
Remove the central locking relay in the rear electronic module (REM) and fault-trace the cable between the fuse holder secondary side (left) and terminal #5 in the relay base. Check for an open-circuit.

Other information
- To access the rear electronic module (REM), see Integrated relay / fusebox cargo compartment / rear electronic module, replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing
- Checking wiring and terminals Checking Wiring And Terminals.









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.
Fault-trace all affected relay circuits for a short-circuit to ground if the value is incorrect.

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 that are affected belong to the central locking relay, unlocking rear left door relay and unlocking rear right door relay.

Other information
- To access the rear electronic module (REM), see Integrated relay / fusebox cargo compartment / rear electronic module, replacing Integrated Relay/Fusebox Cargo Compartment/Rear Electronic Module (REM), Replacing
- For further information about the relays and fuses, see the Wiring Diagram
- Checking wiring and terminals Checking Wiring And Terminals.









Continue - Fault Found

------------------------

FAULT FOUND - Fault Found

-------------------------------------------------