What happens if no key resistance is read by Vats decoder?
What happens if no key resistance is read by Vats decoder?
If an incorrect or no key resistance is read by the VATS decoder module, the module will shut down the start enable and ECM signal outputs for 4 minutes. The SECURITY light will flash during the cranking attempt, and will remain on during the 4-minute duration.
How does a PASSKey System work on a car?
The PASSkey-II signal is a similar square-wave pulsed-ground, but at a 50Hz rate, 50% duty cycle. The system uses two leaf contacts in the outer end of the ignition lock cylinder to connect to the resistor pellet embedded into the key blank just below the bow.
How does a vats and PASSKey System work?
To signal the ECM that a correct key resistance is sensed, the VATS and PASSKey systems use a grounding square wave at a 30Hz rate. The VATS module uses an NPN output transistor to pull down (ground) the 5 VDC reference voltage presented by the ECM on terminal B6.
Where is the vats decoder located in the LH?
Usually, the VATS wiring in the column is in an orange covered cable, sometimes black, and has a lone two-wire connector (no other circuits in the cable). The circuit continues from there to the VATS decoder module via purple/white and white/black wires. The VATS decoder module is located beneath the dash in the LH foot well, near the kick panel.
What is the name of the PassLock module?
PASSLOCK MODULES HAVE MANY NAMES INCLUDING ANTI-THEFT MODULE, VATS MODULE, AND PASSLOCK, BUT THEY ALL REFER TO THE SAME PART. THIS COMPONENT’S JOB IS TO TELL THE ELECTRONIC ENGINE CONTROL MODULE (ECM) THAT THE CORRECT KEY IS BEING USED TO START THE VEHICLE.
Where is the transponder on a GM passkey?
This system uses a special key (PK3 stamped on the shoulder of the key) with a transponder under the rubber cover. The receiver module is located next to the lock cylinder. When the key is positioned next to the lock cylinder receiver module, it energizes the transponder which sends a coded signal to the receiver.
Where does the vats bypass module send the key OK signal?
The VATS bypass module generates the ‘key ok’ signal normally sent from the BCM to the PCM (Powertrain Control Module) or ECM (Engine Control Module). Feature:
How does a GM passkey and PassLock work?
If you see 2.5 volts and the vehicle still won’t stay running, check the fuel pump relay. Here’s how it works, The lock cylinder reads the resistance of the pellet in the key and transmits that data to the theft module. Meanwhile, the PCM provides 5 volts on the dark blue wire.
