Mazda CX-9 Instructions

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

Mazda CX-9 Specifications

General

Brand	Mazda
Model	CX-9
Category	Automobile
Language	English