There was no Jeep Grand Cherokee model in 1974. The Jeep Grand Cherokee was first introduced in 1992. 1974 Jeeps would have had far simpler security systems, if any at all, likely just a basic ignition lock. There were no electronic security systems like those found on later models.
Attempting to bypass or disable any vehicle's security system without proper authorization is illegal and potentially dangerous. If you are locked out of your vehicle, you should contact a locksmith or a roadside assistance service for help.
