Code P1260, theft detected, vehicle immobilized, B1600, Pats ignition key transponder signal is not received?

Trouble code P1260 for a 2009 Mazda CX-9 generally refers to an issue related to the vehicle's theft-deterrent system. So, it sounds like you are using the wrong key, do you have a spare? Also, I would check all fuses with the system on, here is how to reset the security system to help clear the system out and reset it.

https://www.2carpros.com/articles/how-to-reset-a-security-system

This may help as well:

2. After the vehicle is identified, select the following items from the initialization screen of the M-MDS.

- When using the IDS (laptop PC)

- Select "Body"
- Select "Security"

- When using the PDS (Pocket PC)

- Select "Programming".

3. Then, select items from the screen menu in the following order.

- Select "PATS Function"

4. Select the items to be performed from the following:

- Program Additional card key
- Card Key Code Erase and Program
- Steering Lock Unit Programming
- Program additional ignition key
- Ignition Key Code Erase and Program
- Customer Spare Key Programming Enable
- Customer Spare Key Programming Disable
- Parameter Reset

5. The security access begins and the M-MDS displays the "OUT-CODE".
NOTE:
- When "OUT-CODE" is first displayed, turning the ignition switch from the LOCK to the ON position 5 times will change the "OUT-CODE".

6. Input "IN-CODE" corresponding to "OUT-CODE" displayed on the M-MDS screen.

7. If the security access is successful, selected item can be performed.

Check out the images (below). Please let us know what happens.