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You would need to use a meter or test light to find out what exactly is dead. It could be a short in the fuse box, or a bad connection in the harness, or at the battery or starter. You may need a repair book or shop manual to get the wiring diagrams. If nothing on the truck works, you would start at the battery cables and work back to the key switch.
I would take a different but not real easy approach---I would reverse the process and remove the new stereo unit and have all wires connected if possible back to the original radio---you may have a ground wire hooked to wrong place etc.
If this happened as a result of replacing the radio back track to see what you have--in over 30 years of repairing electronic equipment whenever a new issue appears instantly after doing something---back up and undo what you did.
If the security light is blinking, then the security system is DEFINATELY the reason why your car won't start. The actual cause of the problem is MOST LIKELY a defective ignition switch that is not sending the information from your key to the computer.
FIRST try a different key if you have more than one for the vehicle. I have had cars towed into my shop simply because someone was trying to use a cheap duplicate key that was cut at the hardware store. These keys are fine for the doors and trunk. They are great to have around in case you lock your keys in your car. However, they do not have the electronics built into them to allow for engine starting.
If you are using the correct key and a second key also does not work. then...
1. set your parking brake (this will disable your daytime running lamps and conserve battery power.)
2. Connect a battery charger to the vehicle battery if you have one, or see if someone can connect to your battery with jumper cables.
3. Turn the ignition to the START position for about one second. Then release the key to the RUN position. DO NOT turn the ignition OFF.
4. Wait about 10 minutes until the security light quits flashing. Turn the key (without turning it off) to the START position again. The engine should start. If it does not, then you will have to get your car towed in for service.
HINT: you may want to try this a couple times to make sure you are doing it correctly before towing.
If it does start, it is recommended that you have your security system checked for fault codes. I have seen this many times, and it only gets worse and does it more often until this method no longer works to get it started.
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.
I had the same problem last night seems like the ignition is a problem with those cars i called a towing and while i was waiting i kept on trying to start and suddenly it started just as the towing showed up seems like the key is very fragile even just rubbing it on your clothes or even run it tru your hair can **** it up so the car won t recognize the code see your dealer