Theft system problem

Carlos Technician El Salvador Posted   Latest   Edited  
Unsolved
Security
1996 Chevrolet Cavalier 2.2L (4 LN2) 3-spd
Crank / No Start

I am checking a 96 chevrolet cavalier with active anti-theft light, I wonder if these values ​​are correct, sensor pass lock white line 9.6 V, yellow line 4.1 V, black line good ground. The UART data line to the PCM has 3.6 V in KOEO, can someone tell me if these are the values ​​for the anti-theft system to work well. I have already performed a 10-minute relearn and it does not deactivate the light, it should be said that the vehicle was changed to manual transmission.

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Jesse Engineer
Missouri
Jesse
   

Had a similar issue back when. One 10 minute cycle is not enough. It takes at least two cycles back to back and sometimes 3. Be sure and time them out because there's not much leeway to be wrong. Forgot the details but some are 10 min on, 30 seconds off, 10 min on, turn key off. Theft light should be off after each cycle. Some are 20 min on then off. Be sure and use proper cycle. They had some…

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Carlos Technician
El Salvador
Carlos
 

That resistance goes in the cluster.

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Lee Owner/Technician
Michigan
Lee
 

Every time I've done the VATS relearn it takes three cycles: - Insert a key into the ignition switch. - Turn key to the “ON” position without starting the engine. The security light should turn on and stay on. - Wait for 10 minutes or until the security light turns off. - Turn key to the “OFF” position for 5 seconds. - Turn key to the “ON” position without starting the engine. The security…

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Agree
Carlos Technician
El Salvador
Carlos
 

ok..

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Carlos Technician
El Salvador
Carlos
 

I carried out the procedures and did not obtain results, the problem may be in the voltage values, there is something else...

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Marti Owner/Technician
Michigan
Marti
 

Sorry, i cant confirm Specific Known (to Me) values as U hv posted…. But, these are some values that i recall from some of the Passlock systems: Input voltage may be either 10.0V(or 12.0+V), Signal is typically 5.0V(Key Off or KOEO)…and Drops to .4V-4.6v upon KOER/Cranking. What is Very important, is that the signal voltage is Not fluctuating more than .02v after it drops from 5.0v to its…

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Carlos Technician
El Salvador
Carlos
 

Thanks! I looking for this ground

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Willie Mobile Technician
Arkansas
Willie
 

Some of those 96 and 7's, needed a Tech2 to reset the instrument cluster. I have used that feature many times but have never found it in any aftermarket tool yet.

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Carlos Technician
El Salvador
Carlos
 

It will be possible that it need Tech 2, I believe here this tool does not exist.

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Timothy Owner/Technician
Wisconsin
Timothy
 

The white wire should have 12V to the cylinder. The yellow should have five volts disconnected. Since your voltage to feed the sensor/passlock is less than that, I would say the IP is bad. The yellow wire should go up to five volts when cranking. The voltage at KO should always be the same. The relearn from GM's SI, states that the key should go to crank, and then be released. Theft should go…

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Stephen Technician
Tennessee
Stephen
 

youtu​.​be/xhQbx9qc6_I This clip describes the Passlock operation. What are the symptoms of the car’s fault? As the video states, if the yellow wire is clipped AFTER the car is running, the light will come on steady and stay on but the car will run as normal. The resistor is part of the IGN lock housing and they were problematic.

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