Mazda CX-9 User manual

Automatic door-lock/unlock CX-9 /2007 Version 1.0 Page 1
CX-9 Automatic Door-lock/Unlock
Contents
1. Introduction .......................................................................................................................................... 1
2. The Circuit explanation (Detailed diagram in Appendix-A) .................................................................. 3
3. Alternatives/modifications ................................................................................................................... 6
4. Building ................................................................................................................................................. 7
5. In-house test ......................................................................................................................................... 8
6. Install in the CX-9 ................................................................................................................................10
7. Testing in the car.................................................................................................................................11
8. Finalizing the installation .................................................................................................................... 12
9. Diagnose errors................................................................................................................................... 13
Appendix-A: Circuit details..........................................................................................................................15
Appendix-B: Shopping list ...........................................................................................................................16
Appendix-C: Remove panels and (dis)connect battery...............................................................................17
Appendix-D: Re-installing panels ................................................................................................................ 19
1. Introduction
When we bought a Mazda CX-9 in 2007, we were surprised to find that there is NO automatic door-lock.
I have searched Internet and many people had the same surprise. It was confirmed by Mazda that the
CX9 does not have automatic door-lock either. Time for action !
As the door-mechanism is NOT designed to open the door and unlock the door at the same time, I
looked for a way for automatic lock AND unlock to prevent having to press unlock first before exiting the
car (call me lazy). If you don’t want automatic unlock however a small modification is described in
alternative chapter 3 in the document.
I wanted to keep the design simple, easy to build for people with little electronic knowledge, easy to
diagnose in case of issues and low cost. As a result I have designed it with relays and it can be built in 1

Automatic door-lock/unlock CX-9 /2007 Version 1.0 Page 2
hour, tested in 1 hour and installing into the car will take you 2 hours. However it could also take up to
14 days, depending how much experience you have 
Ideally lock/unlock should happen when you switch from PARK to automated/manual gear, but that
would mean a lot of work to take the dashboard out. Remember: one of the design principles was
keeping it EASY. I decided that the parking-brake was a great way to activate door-lock/unlock
Below is very detailed information, however if a less technical person wants to understand this:
1. You start the car as normal
2. Release the parking-brake before you start driving as normal, HOWEVER as by a miracle the
doors lock automatically 
3. Drive as normal
4. Park the car as normal
5. Put the parking-brake on as normal, HOWEVER as by a miracle the doors now UNLOCK
automatically 
6. Switch of the engine.
WOW…. who would NOT understand and like that….. (No Emails with names please!)
For the more technical & lucky people that will built and install; I wish you a TON of pleasure with the
descriptions below. I tried to be complete and as helpful as possible. Take time to read the document
maybe 2 times before you start. It can save you a lot of time. An in-house test is proposed. You do that
BEFORE you install it in the car. I mention it here as many people believe you don’t have to read a
manual before and find themselves in trouble later on.
The building and install requires a basic knowledge of electronics and as well as standard set of the tools
when dealing with basic electronics. If after reading below you find it too difficult or don’t have the
tools, contact a friend or a friend of a friend to help out.
Last but not least, if you decide to build and install, it is all at your own risk and cost. I only share advice
around I have done it, what worked for me and added information to try to help you. However any
issues/damage or cost is at your own risk.
I expect however you will be happy, so happy you want to donate money. Please do so, but not to me,
but think about the people that are less fortunate in the world and support them. Remember that any
Dollar or Euro (or whatever) counts for them. Thank you and happy reading!
Paul

Automatic door-lock/unlock CX-9 /2007 Version 1.0 Page 3
2. The Circuit explanation (Detailed diagram in Appendix-A)
Power-up reset
As soon as 12V power is supplied, independent of parking brake-switch, relay-C is activated. Contact-A is
moving from Normally Closed (NC) to Normally Opened (NO) and is preventing that a door-lock signal
can be passed on. Capacitor C1 is getting charged and at a certain moment Relay-C will drop off.
Contact-A is returning to NC and a door-lock signal to be passed on (depending on Pulse relay).
Activator
The parking brake-switch is the causing the activation. When pressed (e.g. parking brake is on) the
parking brake-switch will connect to ground. Through D1, relay-A is activated with a little delay caused
by R1 & C3. This is necessary to give relay-C at power-on/off just a little head start (~10ms) to make sure
Relay-C is activated JUST before relay-A. As relay-A is a double contact relay BOTH contact-C and
contact-D will move from NC to NO at the same time. This condition will stay until the parking brake is
released (e.g. parking brake is off), relay-A will drop off and contact-C and contact-D will return to NC.
A diode over the relay-A is to prevent spikes to the capacitor C3. Don’t be a wise guy and a put a diode
over the relay-B and relay-C; the circuit will not work.
Pulse
When contact-C closes (e.g. relay-A is on because the parking-brake is on), relay-B will activate and close
contact-B, allowing signal for door-lock to be passed on. Capacitor C2 starts charging and at a certain
moment relay-B will drop off. Contact-B is returning to NC, stopping a door-lock signal.
The timing for relay-C (reset) is twice the time for relay-B (Pulse). The current values will give about ~3
seconds reset and ~1.5 seconds pulse.
Step-by-step how it works
1A: When power is applied first time, relay-C will be activated for ~3 seconds power-on, contact-A is
open and thus NO a door-lock signal can be passed on.
1B:When the parking brake is pressed (on) at the time power is applied, it will activate relay-A with a
little delay (~10ms) to allow step 1A to start happening JUST a little tiny bit earlier. Relay-B will be
activated, by contact-C. Contact-B will close, however as contact-A is open (see step 1A) no door-lock
signal is passed on. Capacitor C2 is getting charge and relay-B will drop off after 1.5 second and then
relay-C will drop-off, because capacitor C1 is now charged.
1C:When the parking brake is now released (off), relay-A will drop off after a tiny small delay and
contact-C and contact-D will return to NC, connecting to relay-B to ground.

Automatic door-lock/unlock CX-9 /2007 Version 1.0 Page 4
Now the charged capacitor C2 will be discharged and relay-B will activate. Contact-B is closed and a
door-lock signal is sent to the contact-D. Contact-D is in NC and the ground signal is sent through a 1K
resistor to the car computer. This indicates a lock signal and the doors will lock. After ~1.5 seconds the
capacitor C2 will have been discharged, relay-B is dropping off and contact-B is returning to NC, stopping
the door-lock signal.
During driving NONE of the relays is activated:
Relay-A is only activated when the parking brake is pressed (on)
Relay-B is only activated for 1.5 seconds to give a pulse (C2 is discharged)
Relay-C was activated for 3 seconds for power-up (C1 is charged)
1D: When parking brake is pressed again (e.g. on), the parking brake-switch will connect to ground
again. It will activate relay-A with a little delay. Contact-C will activate relay-B by connecting to +12V.
Contact-B is closed and a door-lock signal is sent to the contact-D. Contact-D is in NO and the ground
signal is sent directly to the car computer. This indicates an unlock signal and the doors will unlock.
After ~1.5 seconds the capacitor C2 will have been charged, relay-B is dropping off and Contact-B is
returning to NC, stopping the door-lock signal.
During standstill / parking brake is ON / contact ON only Relay-A is activated:
Relay-A is activated as the parking brake is pressed (ON)
Relay-B is only activated for 1.5 seconds to give a pulse (C2 is charged)
Relay-C was activated for 3 seconds for power-up (C1 is charged)
1E: if the parking break is released again (e.g. off) the process repeats starting with step 1C.
Some people, no names mentioned, forget to put a car on the parking brake. If at the time of power-on
the parking brake was released (e.g. off), the normal power-up reset will happen (step 1A), however
relay-A and relay-B will not have been activated. If after ~3 seconds (the reset time) AND before driving
the parking brake is pressed (on) , process 1D will happen and an unlock signal will be sent to the car.
This is normal behavior. What is NOT normal behavior is NOT using the parking-brake .

Automatic door-lock/unlock CX-9 /2007 Version 1.0 Page 5
Power-off reset
When the contact is switched off, power is removed from the circuit. Assuming the parking brake is
pressed (ON) and as such we are at the end of step 1D.
When the power is removed for the circuit, relay-A will stay activate for little time (~36ms) because of
charge in C3, this will allow Relay-C to get activated before Relay-A drops off. A change in relay-A state
will trigger relay-B to provide a pulse. As such the delay will prevent false door-lock signal (locking the
doors while you are still in)
The charged Capacitor C1 will be discharged and relay-C will activate. Contact-A is set to NO, preventing
a door-lock signal to be sent to the contact-D.
When relay-A is dropping off, it will activate relay-B through contact-C. Relay-B will activate because of
the charged Capacitor C2. Contact-B is closed but no door-lock signal is sent because of contact-A being
in NO state.
After ~1.5 seconds relay-B will de-activate and after ~3 seconds relay-C will.
If at the time of contact switching off the parking brake was NOT pressed (e.g. off), we are at the end of
stage 1C. Relay-A was not activated and C2 was NOT charged thus relay-B will NOT activate.
At the end of power-off all relays and capacitors are back in rest, waiting for a new opportunity to shine
and perform their same tricks at the next occasion.

Automatic door-lock/unlock CX-9 /2007 Version 1.0 Page 6
3. Alternatives/modifications
No Unlock wanted
If you want the doors to only automatically lock but NOT to automatically unlock, don’t connect a wire
to the NO contact-D. You will have to manually unlock. Because of the mechanism in CX-9, this requires
to first press unlock on the door before you can open the door with the door handle.
If you would consider this, you don’t need a Relay-A with double contact either, you only need a
SPDT, instead of DPDT. (see Appendix-B shopping list). A tiny bit less cost but a massive amount
less comfort. Trust me… you will love automatic unlock once it is installed and wonder how you
could have lived without it.
In case you want unlock sometimes, but not all of the time, you can consider an extra switch on
the dashboard to allow unlock when you want it. (I have not tried this, but I am sure it works)
NC
LOCK
UNLOCK
GREY
R2 - 1K
To
Doorlock
Contact
D
NO
Separate Switch on
dashboard. If closed all doors
will close and UNLOCK
Unlock only on driver site
If you only want to UNLOCK the door on the driver side when the parking-brake is pressed (on), then do
not connect the grey wire to contact-D, NO. Connect a separate wire to contact-D, NO and the other
side of the wire to White/Black wire on 0940-01E: PIN 5K. This is the connector UNDER the 6 pin
connector on the BCM (see appendix-C). I have not tried this, but I expect this works.
NC
LOCK
UNLOCK
GREY
R2 - 1K
To
Doorlock
Contact
D
NO

Automatic door-lock/unlock CX-9 /2007 Version 1.0 Page 7
4. Building
I have built the circuit directly on and around the relays. I first glued the relays together (super glue / 10
seconds glue) in a way that it still would fit in the plastic box.
I applied red wire for 12V, black for MIN/ground around the relays. Grey for the all the door-lock signals
and white for all the parking-brake signals. This makes it easier to diagnose later instead of or wires
having one color and when you connect wires of a different color on the same contact…..get concerned.
With a little bit of patience and good looking & checking it was an easy job in 1 hour and performed the
in-house test (chapter 5). I used a battery charger for the 12V.
I have drilled a hole in the plastic box to let the wires out and put the relays in the box, while pulling the
4 wires through the hole & put a wire tie around the wires to as stop to prevent them being pulled
completely.
I secured the relays in the box with thick paper on top and aside. I did not glue as I might need to
remove them from the plastic box to troubleshoot more later on (which I had to….)
Before closing the box I included a copy of circuit (printed Appendix- A) for future reference. That is a
good habit in case of problems in the future and you can’t find THIS document.

Automatic door-lock/unlock CX-9 /2007 Version 1.0 Page 8
5. In-house test
Actually before you install in the car, do a test on your table with a 12V supply. It can save you a lot of
trouble, not only because you will have to try to fix the problem sitting in an uncomfortable positioning
next to the car while it is cold or raining, but also make sure the basics are working and not blowing up
fuses in the car. Let alone it will save you the “supporting” remarks from your significant other and that
by itself is worth more than anything else.
Connect the black-wire to the MIN. Hold grey and white wire separate. Connect the red-wire to the
+12V. Don’t expect fireworks…. it is only 12V and if you see sparks…. get a rest or check the circuit.
click-clack
Hurray … The relays have come alive! That is good news. No click-clack…. no 12 volt….fix it first!
First check: Relay-C should pulse for ~3 seconds (Don’t buy a stopwatch.. it is aboutish)
oMake sure the Black wire is still connected to the MIN
oTake the Red wire from the +12V and hold to MIN (to discharge Capacitors C1)
oLocate Relay-C and make sure you can see it well.
oReconnect Red-wire to +12V and watch relay-C. It should activate and… de-activate.. in
~3 seconds
oIf it did, you are good and you are on your way, if NOT, don’t worry (yet)
Check carefully the wires and connection.
Check your circuit (Maybe capacitor C1 is defect or wrongly connected (watch
the polarization of the capacitors!)
Second check: Relay-A should activate.
oMake sure Black wire is connected to MIN
oThe Red wire is connected to + 12V
oLocate Relay-A make sure you can see it well.
oHold the white wire against the MIN (simulating the parking-brake switch)
oRelay-A should activate as long as you have the white wire against the MIN. To see it
well, remove the white wire from the MIN, it should de-activate and repeat it again.
oIf it did activate, you are great if not you are still good..
Check the circuit. Did put you the diode D1 correct? Is the capacitor correct
connected? Is D2 correctly connected (remember the stripe on the diode
should point to +12V)
Do you still have 12V (do you hear click-clack when connecting 12V)?

Automatic door-lock/unlock CX-9 /2007 Version 1.0 Page 9
Third check: Relay-B should pulse.
oMake sure Black wire is connected to MIN
oThe Red wire is connected to + 12V
oLocate Relay-B make sure you can see it well.
oHold the white wire against the MIN (simulating the parking-brake switch)
oRelay-B should activate and after 1.5 seconds de-activate. If you now remove the white
from the MIN, Relay-B should activate and after 1.5 seconds de-activate again.
oRepeat it a couple of times. Every time you hold /remove the white wire, you will hear
every time 2 relays: A and B. Concentrate on relay-B
oIf Relay-B did activate and de-activate, you are fantastic if NOT.. oh well.. you are still
great
Check the circuit. Are the wires on the right contact points on contact-C
Is the capacitor correctly connected (with the –connected to the MIN)?
Do you still have 12V?
Fourth and last check: Making sure that Relay-C is LONGER activated than Relay-B at power-on.
This requires 2 pair of eyes and you only have 1 pair, but it can still be done. NORMALLY if the
capacitor C1 (2200uF) is two times the capacitor C2 (1000uF), this should not be a problem, but
if you have old capacitors, they tend to dry out and lose their power.
oMake sure black wire is connected to MIN
oMake sure the white wire is also connect to MIN (simulating the parking-brake switch)
oLocate Relay-B and Relay-C. Make sure you can see them.
oHold the red wire against the +12V (simulating power-on)
Relay-B should activate and after 1.5 seconds DE-activate.
Relay-C should have activated at the same time as Relay-B BUT will de-activate
later (if it is quite you may be able to hear the click)
oOK.. now remove the red wire from the +12V and hold the red wire against the MIN (de-
charge C1 and C2). Relay-B and Relay-C will activate and de-activate and against Relay-C
should take longer.
oARE U SURE.. ??? NO.. repeat by holding the red-wire against the +12V and repeat he
whole test
oIf relay-B and relay-C activate and relay-B de-activates before relay-C, you are gigantic
and you should consider starting your own business if not.. keep your day-job and
Check the circuit. After the wires on the right contact points.
Is the capacitor correctly connected (with the –connected to the MIN)?
Didn’t you switch capacitor C1 and C2
Are this new capacitors, if not they might have dried out and lost their power

Automatic door-lock/unlock CX-9 /2007 Version 1.0 Page 10
6. Install in the CX-9
There are some good descriptions, coming from Mazda to directly on how to remove the necessary
panels as well as locate the cable connections. I have included a copy of the information in Appendix-C
that is coming from these instructions. I hope it will not get me in copyright trouble for including instead
of referencing, but the information is coming from Internet, I use source reference and I am sure Mazda
wants happy drivers. Thank you Mazda!
Steps
Disconnect the battery (as precaution) - See Appendix-C
a. Disconnection with clear radio-channels and seat-memory.
Remove the panels - See Appendix-C
Appendix-C shows the Body Control Module (BCM). It is located at the front, behind the kick-
panel at the driver side:
a. The white 30-pin connector at the top
b. The white 6-pin connector underneath
Locate the right wires with the right colors and connect the wires from the circuit using the
wire-taps as follows:
oGrey wire: connect to Violet/White (v/w) wire on 30 pin connector; PIN 3R
oWhite wire: connect to Green (G) wire on 30 pin connector; PIN 1A
oRed wire: connect to Black/Yellow (B/Y) wire on 6 pin connector; Pin 4A
oBlack wire: connect to ground/chassis connection on the car
After connection the wires, Connect the Battery - See Appendix -C

Automatic door-lock/unlock CX-9 /2007 Version 1.0 Page 11
7. Testing in the car
This is to be performed after it is installed, but do it before you have the relay plastic box well secured
and all the cable perfectly bundled with tire-wraps/tie wires. Trust me…… I have been there…
Get in the car and close the doors as they can’t be locked with an open door. Make sure your car is on
flat ground and does not roll away when releasing the parking brake. Also make sure your panels are in
a save location and the car is not rolling over it or you sitting on it.
Put the ignition switch in the ON. That is one step beyond ACC and the lights on the dashboard will go
on. You can also start the engine and after you release it; that is ON position.
A. Door-locks should NOT have activated so far. If that did happen however go to chapter 9:
diagnose step 1.
B. Press and release the parking brake (off) to remove the parking brake. The doors should lock. If
that does not happen go to chapter 9: diagnose step 2.
C. Press the parking brake (on), the doors should go to unlock. If that does not happen go to
chapter 9: diagnose step 2.
D. You should be able to repeat step B and C, but don’t try to get your doors go wild 
E. Before you switch off the contact make sure that parking brake is pressed (on). The doors
should be unlocked. When switching off, door-locks should not activate. If that does happen go
to chapter 9: diagnose step 1.
F. Same as E, but then with parking brake is released (off). The doors should be locked. When
switching off, door locks should not activate. If that does happen however go to chapter 9:
diagnose step 1. You will have to unlock manual in any case.
If all above steps pass you are ready to finalize the installation following the steps in chapter 8.

Automatic door-lock/unlock CX-9 /2007 Version 1.0 Page 12
8. Finalizing the installation
There are some good descriptions, coming from Mazda to directly on how to remove the necessary
panels as well as locate the cable connections. I have included a copy of the information in Appendix-C
that is coming from these instructions. I hope it will not get me in copyright trouble for including instead
of referencing, but the information is coming from Internet, I use source reference and I am sure Mazda
wants happy drivers. Thank you Mazda!
Steps
Fasten the relay box with relays on a secure place with tie wires under the dashboard. You will
find a good place high up under the dashboard. Also use tire wraps/tie wire to make sure that
the wires are secured and not in the way.
Replace the panels - Appendix-D
Last but not least…
oPut the tools back in the tool-box
oClean the car, vacuum the floor
oFinal check and then give a demonstration!
Even better if you have an significant other …. (Probably the less technical person), ask him/her to
act as “normal”with the car. I bet one of two things will happen:
1. Automatic door lock/unlock is not noticed (actually that is VERY good news)
2. Parking brake is not used as it should (that is bad)
So much for a fine demo and credit for all the hours of hard work. Well the good news is that you
stayed out of trouble and YOU know you have achieved. What is more important? 
Time to celebrate… the job is done!

Automatic door-lock/unlock CX-9 /2007 Version 1.0 Page 13
9. Diagnose errors
Step 1: If door-locks are activated either during power-on or power-off, it means that relay-A is
activating or de-activating before Relay-C can prevent a door-lock signal to be sent.
a. Check that relay-C is activated and de-activated after ~3 seconds at power-on or Power-
off. If NOT.
i. Check the components are correct and correctly connected.
ii. Check your circuit (Maybe capacitor C1 is defect or wrongly connected (watch
the polarization of the capacitors!)
b. If Relay-C does activate and de-activate (as check in step 1.a),
i. Check that contact-A is correctly connected with contact-B to prevent door-lock
signal at power-on/off.
ii. Check that the circuit around Relay- , especially C3 is correctly connected
iii. Otherwise try to increase the C3 value, e.g. double to 200uF. This will increase
the time for activation/de-activation of Relay-A. The relay-C might be slow. C3
should NOT be more than half the value of C2. (this is unusual action to take as
the change is less than 0.001% that this is the cause, but you never know)
Step 2: The doors won’t lock or unlock:
1. If you don’t hear a clicking sound from the door-locks when move the parking-brake between
pressed and released;
oCheck that the doors lock/unlock with the manually. If NOT :
Check the fuse D/L : 25A in the engine area is not broken (see owner’s manual)
oCheck that you have 12V power on the relay circuit with a meter. If no power :
Make sure the ignition switch is in the correct position (ON)
Check the red and black wire connections
Check fuse 4 (Meter 10A) in the glove fuse box is not broken. (see owner’s
manual)
oCheck that parking brake-switch activator is correctly working:
With the ignition switch in ON the red brake-light on the dashboard should
switch on/off with the parking brake between released and pressed. Make sure
it is fully released and pressed!
Check that the white wire is correctly connection to the green
Check that the white wire is connecting to ground (with an ohm-meter) when
the parking brake is pressed (on)
oCheck that the door-lock signal is correctly working :

Automatic door-lock/unlock CX-9 /2007 Version 1.0 Page 14
Check that the grey wire is correctly connected to black/violet wire
When you connect the grey wire to ground with a test wire, the doors should
lock.
2. If you hear the door-locks do make a clicking sound when move the parking-brake between
pressed and released, it could mean they are activated but either:
oCheck whether you can lock/unlock manual. If NOT:
One of the doors is still open. Check the doors and your internal lights; if they
are on, a door is still open.
Pulse Relay-B might be in constant on. Check whether Relay-B is only one during
the pulse for ~1.5 seconds.
Disconnect grey wire and see whether manual switch now works, if so:
oCheck your circuit (Maybe capacitor C2 is defect or wrongly
connected (watch the polarization of the capacitors !)
oMaybe the door-locks try to unlock, instead of lock, or opposite.
To check whether the door-locks try to LOCK instead of Unlock, unlock the doors
manual and repeat the test step B. If the doors now lock, you have reversed the
resistor R2 connection on the relay. (we are only human)
oDon’t hold the UNLOCK door switch pressed at the same time as pressing and releasing
the parking-brake. It would harm, but it does not help either.
oTest whether grey wire is correctly connected.
With a test wire connect grey wire to ground. Door should UNLOCK.
With a test wire connect grey wire to resistor of 1K (1000 Ohm) and connect
other side of resistor to ground. Door should LOCK.
oDisconnect grey wire from V/W wire and with an ohm meter check that the grey wire is
NOT making connection constant to ground. With the ignition key in ON, wait 3 seconds,
press and release parking brake couple of times. You should see the meter do a short
detection before showing open circuit again (detection is the right word, the needle will
move only shortly)
If either is not working remove the circuit (e.g. disconnect grey wire from V/W
wire and double check you component connections.
oThe pulse time is too short. Increase the value of capacitor C2, but don’t make it more
than three-quarter the value of C1. If longer time is needed increase C1 value
accordingly. (This step is very unusual to be needed, but MAYBE you are unlucky…)

Automatic door-lock/unlock CX-9 /2007 Version 1.0 Page 15
Appendix-A: Circuit details
NC
NC
NC
NC
LOCK
UNLOCK
GREY
RED
WHITE
BLACK
D1
1N4001
C1
2200uF/
25V
C2
1000uF/
25V
R2 - 1K
R1 - 56
+12V
To
Parkswitch
Ground
To
Doorlock
Activator Circuit Pulse generator Power on/off
Reset
Relay A
Relay B Relay C
Contact
B
Contact
A
Contact
C
Contact
D
NO
NO
NO
NO
C3
100uF/
25V D2
1N4001
The circuit has 3 major parts, build around 3 separate relays:
1. Activator: Triggered by the parking brake-switch.
2. Pulse generator: When triggered by the activator it creates the pulses for door lock/unlock.
3. Power on/off reset: Makes sure NO lock/unlock pulse is sent during the instable power-up and
power-down period of the circuit.

Automatic door-lock/unlock CX-9 /2007 Version 1.0 Page 16
Appendix-B: Shopping list
Resistor (normal ¼ watt)
R1 56 Ω/Ohm
R2 1000 Ω/ohm (1K)
Diode (1A)
D1 1N4001
D2 1N4001
Capacitor (Don’t go for 16V, unless you can’t get different)
C1 2200 µF/ 25V
C2 1000 µF/ 25V
C3 100 µF/ 25V
Relay (many relay can have range which is good as well e.g. 6V –30V)
A 12V –DPDT Relay (Double Pole, Double Throw relay)
B 12V –SPDT Relay (Single Pole, Double Throw relay)
C 12V –SPDT Relay (Single Pole, Double Throw relay)
Wire (0.75 mm2/ 18 Gauge) –Available in any good auto shop
Red 50cm/ 20 Inch
White 50cm/ 20 Inch
Grey 50cm/ 20 Inch
Black 50cm/ 20 inch
1 x plastic box large enough to hold the circuit
4 x IDC wire-tap or also called quick splice –Available at any good auto shop
Try to see whether they also sell one box of patience…. You might need it 

Automatic door-lock/unlock CX-9 /2007 Version 1.0 Page 17
Appendix-C: Remove panels and (dis)connect battery

Automatic door-lock/unlock CX-9 /2007 Version 1.0 Page 18
BCM
Reconnect the battery
a. Verify that all connections are secure.
b. Turn the ignition switch to RUN position
c. Reconnect the negative battery cable.
d. Turn the ignition switch to the OFF position.

Automatic door-lock/unlock CX-9 /2007 Version 1.0 Page 19
Appendix-D: Re-installing panels