My inner driver door handle broke in which appears to be a common issue..

Check for broke wires inside the boot from body to driver door , this is a common problem . If you don't find broke wire's , pull the door panel to get at driver door switch . Check for voltage an ground circuit .
Rendezvous Door Lock System Components
The power door lock system consists of the following components:
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Body control module (BCM)

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Driver door lock switch

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Front passenger door lock switch

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Door lock actuators in each of the doors

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Door lock system fuse into the BCM (BCM D 25A fuse)

Door Lock Operation
When the BCM detects a transition of either of the door lock switches to the LOCK position, it switches the door lock actuator lock control circuit to voltage. Since the lock actuator unlock control circuits are at ground potential within the BCM, the door lock actuator motors transition to the Lock position.
Driver Door Unlock Operation
When the BCM detects a transition of either of the door lock switches to the UNLOCK position, it switches the driver door lock actuator unlock control circuit to voltage. Since the door lock actuator lock control circuit is at ground potential within the BCM, the LF door lock actuator motor transitions to the Unlock position.
The driver door lock actuator unlock control circuit is a dedicated control circuit used only for the driver door lock actuator motor. This is done so that the driver door may be unlocked by itself using a keyless entry transmitter or an automatic door unlock function (if programmed).
Passenger Door Unlock Operation
When the BCM detects a transition of either of the door lock switches to the UNLOCK position, it switches the door lock actuator unlock control circuits to voltage. Since the door lock actuator lock control circuit is at ground potential within the BCM, the passenger door lock actuator motors transition to the Unlock position.
The door lock actuator unlock control circuits are dedicated control circuits used only for the passenger door lock actuator motors. This is done so that the driver door may be unlocked seperate from the passenger doors using a keyless entry transmitter or an automatic door unlock function (if programmed). This video on testing computer controlled door locks on a Subaru , doesn't matter . test yours same way > The BCM controls your door locks .
Are all of the power door locks inoperative from both door lock switches?

If door is in jammed state, open door by
repeatedly pressing the unlock button, while jiggle the inner or outer door handle this will help free up the
internal gears in the actuator that are jammed.
once the door is open.
Replace the door lock actuator with a revised
part;
Part No.: Description Qty:
96872800 LOCK,LHF DOOR (SX, CX, LX) 1
96872801 LOCK,RHF DOOR (SX, CX, LX) 1
96872811 LOCK,LHR DOOR (SX, CX, LX) 1
96872812 LOCK,RHR DOOR (SX, CX, LX) 1
96872803 LOCK,LHF DOOR (MAXX) 1
96872804 LOCK,RHF DOOR (MAXX) 1
96872813 LOCK,LHR DOOR (MAXX) 1
96872814 LOCK,RHR DOOR (MAXX) 1

Vehicle Torque Spec for door lock actuator
Captiva SX,CX, LX 10 Nm
Captiva MaXX 8 Nm

There's always a fuse or relay. Some vehicles have 2-3 boxes in various places in the engine, under dash, behind glove box or either front door gash visibly obscured by the doors. But aside from that the usual problem is that some sort of strain against the door lock actuator such as icing or someone pulling the handle when the actuator is energized results in breakage. The answer is usually replace the door lock actuator. Prices vary and frequently each of 4 doors uses a different unit. My wife broke the SUV door last year. The actuator cost $389. Found it at a junk yard for $100. Other problems are rodent wire damage, excessive connector wear, corroded connectors. Good luck.

I am guessing your question is How to Replace the door lock actuator??? you will need to remove the door inner panel, BTW keep the window wound up while you are doing this repair. You will have discovered you need to remove the door handle, the window handle and deal with the door's wiring. It is not easy to get at but you will find it better with as much as possible taken out of the way,

I really doubt one loose door latch will keep all the door locks from working . There are a lot of thing's involved in the power door locks ,relay's , wiring , master control switch etc..... Viewing wiring diagrams , testing electrical circuit's , PWR LOCKS 20A fuse etc....Are the power door locks and the driver power window inoperative?

Did you review the Power Door Locks Description and Operation?
YES - Go to Step 2
NO - Go to Symptoms - Doors
2
Verify that the power door locks are inoperative.
Do the power door locks operate normally?
YES - Go to Testing for Intermittent Conditions and Poor Connections in Wiring System
NO - Go to Step 3
3
Are the power door locks and the driver power window inoperative?
YES - Go to Step 7
NO - Go to Step 4
4
Are the power door locks inoperative from a single door lock switch?
YES - Go to Step 5
NO - Go to Step 6
5
Is the driver door lock switch the inoperative switch?
YES - Go to Step 8
NO - Go to Step 9
6
Is the driver door lock actuator the inoperative actuator?

Test the battery positive voltage circuit of the drivers switch assembly for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 21
Go to Step 8
8
Test the ground circuit of the drivers switch assembly for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 21
Go to Step 13
9
Test the passenger door lock switch control circuits for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 21
Go to Step 12
10
Test the driver door lock actuator unlock control circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 21
Go to Step 14
11
Test the door lock actuator control circuits for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 21
Go to Step 15
12
Test the passenger door lock switch ground circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 21
Go to Step 16
13
Inspect for poor connections at the harness connector of the drivers switch assembly. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 21
Go to Step 17
14
Inspect for poor connections at the harness connector of the driver door lock actuator. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 21
Go to Step 18
15
Inspect for poor connections at the harness connector of the appropriate passenger door lock actuator. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 21
Go to Step 19
16
Inspect for poor connections at the harness connector of the passenger door lock switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 21
Go to Step 20
17
Replace the driver switch assembly. Refer to Door Lock and Side Window and Outside Rearview Mirror Remote Control Switch Replacement .
Did you complete the repair?
Go to Step 21
--
18
Replace the driver door lock actuator. Refer to Front Side Door Lock Replacement .
Did you complete the repair?
Go to Step 21
--
19
Replace the appropriate passenger door lock actuator. Refer to Front Side Door Lock Replacement or Rear Door Lock Replacement .
Did you complete the repair?
Go to Step 21
--
20
Replace the passenger door lock switch. Refer to Door Lock and Side Window and Outside Rearview Mirror Remote Control Switch Replacement .
Did you complete the repair?
Go to Step 21
--
21
Operate the system in order to verify the repair.
Did you find and correct the condition?
System OK
Go to Step 2

-If the problem is that keyless remote does unlock or lock door, but the lock lever still move when pulling up and down by hand. Door still open and close with both inner and outer, then might the driver door lock actuator is bad. The actuator lock and unlock the door for you when using the keyless remote or door lock/unlock switch.

-if you try using the key to unlock door and the key doesn't turn the door cylinder, then you have a bad door lock cylinder.

-if the lock lever doesn't move up or down and you can't open door using any handle, then you got a bad lock latch assembly.

I'm not sure what the issue is but hope this helps you.

Jaguar 2000-06 - Locks & Lock Systems
Power Door Locks - Removal & Installation

Door Lock Switch
Door Lock Diagnosis & Testing

1. Visually inspect the following:
   Misaligned door(s), hood or luggage compartment lid Door latches Actuating rod Exterior door handle Interior door handle Door lock cylinder Cable Luggage compartment lid exterior release switch Fuse(s) Wiring harness Electrical connector Door lock actuator Remote transmitter batteries Vehicle battery Remote transmitter Door lock switch Front electronic module
2. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.

Door Lock Motor
Coupe And Convertible

1. Turn ignition key to position II.
2. Motor door glass to fully raised position.
3. Turn ignition key to position O.
4. Disconnect the negative battery cable.
5. Remove door casing for access.
6. Remove door water shedder.
7. Position PVC secondary water shedder for access.
8. Slacken and remove the door glass rear runner lower securing screws.
9. Reposition door glass rear runner. Mark the position of the glass rear runner upper securing screw.
10. Slacken and remove the upper securing screw and move the runner away from the glass.
11. Disconnect door handle and lock barrel (driver door only) operating rods from latch links.
12. Slacken and remove the three latch assembly securing screws and position latch for access.
13. Remove latch motor harness multiplug from mounting bracket and disconnect multiplug.
14. Release operating cable from door handle. Move inner door handle to the locked position. Remove operating cable outer abutment from support bracket. Disconnect cable inner from door inner handle.
15. Remove lock motor assembly from door.
16. To install, reverse removal procedure.
    
    
    

    Fig. Removing door lock actuator
    

Sedan

1. Remove the door window glass
2. Detach the interior door handle.
3. Detach the actuator remote cable from the interior door handle.
4. Remove the interior door handle.
5. Detach the door window glass run.
6. Remove the exterior door handle retaining screws.
7. Remove the front door actuator retaining screws.
8. Reposition the front door actuator and exterior handle.
9. Remove the front door actuator and exterior handle.
10. Disconnect the front door actuator remote cable.
11. Detach the door lock cylinder connecting rod (1).
12. Detach the exterior door handle connecting rod (2).
13. Remove the front door actuator (3).
14. To install, reverse removal procedure.
    
    
    

    Fig. Removing door lock motor-Sedan
    

Hope this helps.

The Actuator is not functioning anymore, check to see if there is a fuse for it first. If that is ok then remove the actuator and test it outside using some wire and your car battery to see if actually moves or doesent this will tell you if you need a replacement.

It is usually a tab on the the back of the handle that breaks. But the handle isn't too hard to replace.

Most probably the lock actuator is frozen in down position. it could be your lock cylinder, but the actuator is the most common problem. You have to remove the inner trim panel to access it.