• Gm Passlock Problems
• How Does The First Generation Gm Pass Key System Works
• How Does The First Generation Gm Pass Key System Work Plan

At this time, you may also want to check the fuse, see Fuses and Circuit Breakers. If the engine still does not start with the other key, your vehicle needs service. If your vehicle does start, the first key may be faulty. See your dealer/retailer who can service the PASS-Key® III+ to have a new key made. The first generation PassKey systems incorporated a resistor pellet into the head of the key. The resistor made contact with terminals in the lock cylinder and the system read the resistance value of the resistor pellet. These systems had a high failure rate, so GM changed to the PassLock system. The basic purpose of transponder key systems is to eliminate auto theft, and therefore it is central to your car’s security system, or anti-theft system. Due to the high number of stolen Corvettes, GM was the first US auto manufacturer to introduce a chip key on the 1985 Corvette.

according to ehow.com there is a resistor built into the key and

if the value of the resistor in combination with the other ones in

your ignition do not match what is stored in your cars database the

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system will reject the key.

Passkey III is not resistor-based. There is a rfid

(radio-frequency id) chip in the black plastic head of the key.

When the key is turned to start, the exciter coils in the lock

cylinder housing fire the id chip in the key, the theft-deterrent

Gm Passlock Problems

module reads the rf signal and sends a password to the PCM - if the

How Does The First Generation Gm Pass Key System Works

key is recognised the PCM turns the starter and/or fuel pump on and

the car starts. If the key is unrecognised or the ignition cylinder

is turned without a key inserted (no rfid communication to theft

deterrnet module) the PCM disables the starter and/or fuel

How Does The First Generation Gm Pass Key System Work Plan

pump.