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Posts Tagged: Buick

Engine Overheats – GM vehicles

Engine Overheats No radiator fans on GM vehicles, Chevrolet, Impala, Pontiac, Buick, Cadillac GM uses a pretty nifty technique to control the radiator fans on late model vehicles. The system consists of two fans and three relays. When the powertrain control module (PCM) detects the need for cooling from the engine coolant temperature sensor (ECT) at 223 degrees or refrigerant pressure above 190-psi., it provides a ground signal to the low speed fan relay. Power flows to one fan, and the ground for that fan flows to the second fan. … Read More

Passlock III reset procedure

How to do a Passlock III reset This is one in a series of articles. READ THIS FIRST GM made several different types of anti-theft systems. VATS, PassKey, and PassLock. The troubleshoot and reset procedures are different for each. PassLock seems to have the highest failure rate. So if you have a key WITHOUT a chip in it, chances are it’s a PassLock system. This article describes how to troublshoot and fix a PassLock system. But here are some more articles to help Click here to see the resetting procedure … Read More

Perform a Passlock reset procedure on your GM Vehicle

How to perform a PassLock Reset Procedure GM’s PassLock anti-theft system is plagued with problems and they can leaveĀ  you stranded. But you can get going again by using the PassLock reset procedure until you can get it fixed properly. The problem with the system is a faulty sensor in the lock cylinder case. This made some sense, given the technology at the time. GM figured that thieves would just a slide hammer and yank the lock cylinder out and use a screwdriver to turn the ignition switch. So they … Read More

GM Passkey II reset procedure

How to perform a GM Passkey II reset procedure GM made several different types of anti-theft systems. VATS, PassKey, and PassLock. The troubleshoot and reset procedures are different for each. PassLock seems to have the highest failure rate. So if you have a key WITHOUT a chip in it, chances are it’s a PassLock system. This article describes how to troubleshoot and fix a PassKey II system. But here are some more articles to help. The Passkey II reset procedure is shown below Click here to see the resetting procedure … Read More

GM PassKey and PassLock overview

Diagnose problems with anti-theft systems in GM vehicles Read More


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