I have a 2008 Mazda 6 That is currently not cranking because the immobilizer has disabled the starter. The little security light flashes every 2 seconds with or without the key in. Battery is good

You can't bypass an immobilizer as it is all computer controlled and monitors the security modules. You have to fix the issue not find a way around it.

https://www.google.com/search?q=mobile+auto+electrician+near+me

Immobilizer System

mazdabg.com https://www.mazdabg.com > CT-L1007_en PDF The PATS (Passive Anti-Theft System) is an immobilizer system that has been developed by Ford and used for the first time by Mazda in 1996 for the 121 (ZQ).
70 pages

How to reset immobilizer on 323 Mazda 1998?

JustAnswer https://www.justanswer.com > Car Questions
May 28, 2014 - Turn key 1 to LOCK and wait for 5 minutes until security light decrease in flashing frequency to 1.2 seconds. 3. Input code word. 4. Observe ...
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SOLVED: How to reset anti theft in mazda b3000.

Fixya https://www.fixya.com > ... > Cars & Trucks > Mazda
Nov 29, 2020 - You can also to reset the anti theft in a mazda b3000, try disconnecting the battery for around 10 minutes.

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  mazda security reset Questions & Answers (with Pictures)

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  ...mazda b3000 security light blinking engine wont start \ You can put it on standby mode by holding the alarm reset button down while turning the key back & ...
  
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Hi Joan Whittaker,what does no crank mean.
the starter motor is dead? some posters call d crank= running engine.
which engine there? cranks fast but will not start.
underhood fuse box f24 blown?
step 2 after all fuses checked is:
shift to Neutral see if that allows cranking per my red circle below
is PCM control.
is the dash IMMO lamp happy?

as you can see the pcm decides to do the cranking or not
via its starter relay.
if you scanned the PCM it will tell you why it id not start.
immo error OR A/t PRNDL (TRS) ERRORS. OOPS




the IMMO page in your users guide covers IMMO
if key 1 fails try key2, car came with 2 keys new.
READ ALL PAGES ON IMMO FIRST

If the engine does not start and the Security System
Light comes on
Security System Light (CLUSTER LAMP ICON LOOKS LIKE CAR CUT IN HALF WITH A PADLOCK, never ignore this lamp.
This light flashes when the Theft
Deterrent System has been
activated.



https://www.manualslib.com/manual/1078925/Cadillac-Cts.html?page=256

Immobilizer Reset

https://www.google.com/search?q=2008+mazda+3+security+reset

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Yes stop guessing! The "let's try replacing this" method of car repair is expensive and doesn't work. Why do you _think_ the battery is bad? Did you check voltage, do a load test for amps? Did you take it to an Interstate battery shop for a 2 minute in-car diagnostic test? Compare CCA (cold cranking amps) against what the battery label says.

Why just change the starter. Take jump leads. One pair of ends on the battery and the other ends on the starter connectors, the big red one with the brass nut is positive, the negative can clip to a bolt. Does the starter turn?

Security System and Immobilizer.

Did you disconnect the battery whilst you were deciding it was 'bad'? If so, you have to reset the security system.

https://www.google.com/search?q=2005+nissan+maxima+security+reset

Modern cars are fixed by electronic diagnostics, first and mechanical work second. Call out a mobile auto electrician who will use a pro grade scan tool computer and find the issue and fix it in 20 minutes.

https://www.google.com/search?q=auto+electrician+near+me

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Is there a Light lit or flashing when you crank the starter ? SECURITY , a picture of a car an lock etc..
If the transponders value is incorrect the BCM will send the fuel disable password to the ECM/PCM via the serial data circuit. The components of the immobilizer system are as follows:
?€¢
BCM

What engine does your Allure have ? Did you check for spark an fuel pressure ?

Antitheft or Security system failure is a common problem on GM vehicles. Every time you put your key in the ignition, the vehicle's security system reads the signal from your key to make sure it is OK to run. When it receives the "correct key" signal, the security system allows the starter to turn over, and/or the fuel injectors to function and your car works like it normally does every day. If you were to use a different key, or try to hot wire it, the system would shut down these parts of your car, thus making the vehicle completely immobile. This is GM's way of preventing vehicle theft. The problem is that the system is known to fail quite commonly. It has been failing consistently for around 30 years. When it fails, two things can happen. First, you turn the key and nothing happens at all. Lights work, radio works, windows work... just not the starter that you need to start the vehicle. This is a "starter immobilizer". Second, you turn the key and the vehicles starts just fine, but then stalls in 2-5 seconds. This is a "fuel immobilizer". It literally cuts off the fuel injectors and stalls the vehicle to immobilize it. These are normally, but not always followed by a light on the dash that says SECURITY or ANTITHEFT. These lights are to inform you of the system's failure to collect the information it needs from your key to the computer. If your security/antitheft light is on, odds are you will be stranded soon, if not already. Remember that the security system controls the security light. If the system is failing, the light may never warn you of the failure. There is a lot of info on this site that you can read up on. http://vatspasslockpasskeysecurityhelp.yolasite.com/

sounds like key is bad maybe worn out,have you used different key recently

first thing to do is get the car not to crank and check for power to the starter. if the starter has battery power and signal from the ignition switch then the problem is the starter. second thing is to check the plug at the trans range switch. the connector may be loose since you just had the trans repaired. ground may be an issue but not likely since the dash lights and other things work. GOOD LUCK.

Hi there,

Your Mazda 6 keys have transponders built in and only the correct key I.D. will activate your vehicle's immobilizer.

I'm at a loss as to how changing a fan belt could have altered your vehicle's immobilizer system - are you absolutely certain the garage hasn't disturbed any of the electronics?

First, we need to establish whether your vehicle's immobilizer still considers your keys as valid.

- Insert Key # 1 and turn ignition to ON (do not start).
Observe the "Security" light in the cluster - it should illuminate, then turn off after approx. 3 seconds. If this works, then Key # 1 is considered still vaild.
- quickly turn Key 1 back to LOCK position and remove key.

Wait 5 seconds...

- Insert Key # 2 and turn ignition to ON (do not start).
Observe the "Security" light in the cluster - it should illuminate, then turn off after approx. 3 seconds. If this works, then Key # 2 is considered still vaild.

Note: if Security light does not behave as above and keys still won't start your car, then your keys are no longer validated by the PCM

If this is the case, then unfortunately unlike other manufacturers, only Mazda will be able to re-program your key's ID into your vehicle's PCM. Contact your local Mazda Dealership to discuss.


Regards,

Scott

The immobilizer essentially is a relay they spliced in series between the ignition lock and starter solenoid. All you have to do is jumper these 2 wires back together again. You can test wich wire to the immobilizer is from the ignition by watching a test light probed to the contacts when someone cranks the engine. The solenid wire is easier to trace because you can follow it from the starter.