Mazda CX-9 Instructions Manual
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Mazda CX-9 Instructions Manual

Automatic door-lock/unlock
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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 1

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  • Page 1: Table Of Contents

    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.
  • Page 2 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 2...

  • Page 3: The Circuit Explanation (Detailed Diagram In

    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 3...
  • Page 4 (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 4...
  • Page 5 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 5...

  • Page 6: Alternatives/Modifications

    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.

  • Page 7: Building

    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 7...

  • Page 8: In-House Test

    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 8...
  • Page 9 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 9...

  • Page 10: Install In The Cx-9

    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 ...

  • Page 11: Testing In The Car

    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 11...

  • Page 12: Finalizing The Installation

    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 ...

  • Page 13: Diagnose Errors

    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) o Check that the door-lock signal is correctly working : Automatic door-lock/unlock CX-9 /2007 Version 1.0 Page 13...
  • Page 14 The 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 14...

  • Page 15: Appendix-A: Circuit Details

    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 15...

  • Page 16: Appendix-B: Shopping List

    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 16...

  • Page 17: Appendix-C: Remove Panels And (Dis)Connect Battery

    Appendix-C: Remove panels and (dis)connect battery Automatic door-lock/unlock CX-9 /2007 Version 1.0 Page 17...
  • Page 18 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 18...

  • Page 19: Appendix-D: Re-Installing Panels

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

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