Encoded Ignition Key

When ignition switch is in START or RUN positions, Passive Anti-Theft System (PATS) transceiver module initiates encoded ignition key interrogation process. Each encoded ignition key must be programmed into the vehicle's Powertrain Control Module (PCM) before it can be used to start the engine. There are special diagnostic repair procedures that must be carried out if a new encoded ignition key is necessary. See PROGRAMMING . This system also contains a new feature named Unlimited Key Mode. This feature allows a customer to program more than 8 keys to their vehicle if they request it. Each vehicle in Unlimited Key Mode is set up with a special Unlimited Transponder Security Key. This allows all customer vehicles to share the same keys, but no other keys from outside can be used to operate the vehicles. For an individual customer, any randomly selected Security Key is acceptable. See KEY PROGRAMMING - UNLIMITED KEY MODE  under PROGRAMMING.