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Sounds like the security system is causing your problem. Is the "security" light flashing? If it is, turn the key on, leave the key in the ON position for 10 minutes. The light will stop flashing. Now, turn OFF the key, turn it back to ON, and then crank it. It should start. If the security light starts flashing again, go through the process again until it starts. This is resetting the security system after the battery has died, battery has been changed, radio was changed, instrument cluster was removed and replaced, etc. Hope this works for you.
What you say is very possible . The security (immobiliser) needs a constant transmission of signal to keep the system operational and if the battery in the key is nearly flat or loose then this flow of signal is intermittent and the immobiliser will eventually take control and shut down . Fit a new battery in the key and have it reprogrammed to the car.
sounds like the bcm may have failed, if so new bcm and new keys and programming with tech2
thats the worst case
wiring issue eg ignition switch
its not reading the key due to security light still flashing
the manual over ride should have worked if it didnt then i would be checking all fuses and power inputs to the bcm from the ignition switch
You need to reset the security system. Turn the key on. The security light should be flashing. Leave the key on for 11 minutes. The security light should stop flashing. Turn the key off. Turn the key on. Leave the key on for 11 min. again. Do the process a third time. It should start and run on the next key turn. ( also hook a battery charger to the truck while doing this 30 min. procedure. If the battery goes low at any time you will have to start over.)
if its early 05 round heart shaped remote it needs programming into system at dealer with Tech2
later 05 to 07 had square (rectangle) shaped remote 1.2 ID Code Additional Registration Note: This procedure will add additional remotes to the Keyless Entry Control Units memory. A total of 4 remote transmitters may be programmed into the Keyless Entry Control Units memory. When a total of registered and newly registered remotes exceed 4, the oldest one shall be erased. Step Action 1Note: Make sure that all the doors are closed and unlocked. Insert the ignition key into the ignition switch. Open the driver's side door. 2 Turn the Ignition key to the “ON” position and then to the “LOCK” position three times (The key should remain in the “LOCK” position) Note: This step must be carried out within five seconds. 3 “CLOSE” and “OPEN” the driver’s doors once (Leaving the driver’s door in the “OPEN” position) Note: This step must be carried out within five seconds after step 2 is completed. 4 Wait for 8 seconds (This wait time is critical) 5 Turn the Ignition key “ON” and then to the “LOCK” position once and turn key to the “ON” position (The key should remain in the “ON” position) OR on/lock once Note: This step must be carried out eight seconds after step 3 is completed. 6 “CLOSE” the driver’s door The HAZARD lights should flash 3 times (This acknowledges the Keyless Entry Control Unit has entered programming mode) 7 Operate the lock or unlock button of the transmitters to be programmed; a flash of the HAZARD lights indicates the remote has been successfully programmed into the control unit 8 The HAZARD lights will flash approx 4 seconds after pressing the remote button to indicate the Keyless Entry Control Unit has exited programming mode.