How does the PassLock sensor on a car work?
Voltage to the lock cylinder case sensor is provided by the BCM. The BCM measures the voltage on the sensor circuit. The voltage value indicates whether the Passlock sensor has been activated by the rotation of the lock cylinder or whether the lock cylinder has been removed, indicating a tamper situation.
What is the system fault code for PassLock security?
When the sensor defect starts, it usually presents itself as system fault code B2960. A red (or yellow) “security” warning light will stay illuminated and the engine will either a) never start or b) start for a moment and then shut down.
What is the BCM code for the PassLock sensor?
B2947: SHORT TO GROUND ON THE PASSLOCK SENSOR POWER CIRCUIT The BCM sets this code if it sees a short to ground on the Passlock sensor power circuit (white wire) for one second. The test occurs with the ignition switch in the ACCESSORY, ON, or START position.
How much does it cost to replace a PassLock sensor?
Rinse, repeat, and cry. A more permanent solution is to either replace the ignition lock cylinder or bypass the sensor. Replacement cylinder with new sensors can cost, with labor, as much as $450. Bypassing the sensor will void any warranty, but since most of these vehicles are out-of-warranty at this point that might not be of any concern.
How to relearn the PassLock sensor data code?
Observe the SECURITY telltale, after approximately 10 minutes the telltale will turn OFF. Turn OFF the ignition, and wait 5 seconds . Repeat steps 1 through 4, 2 more times for a total of 3 cycles/30 minutes. The vehicle is now ready to relearn the Passlock Sensor Data Code and/or passwords on the next ignition switch transition from OFF to CRANK.
How long does it take for PassLock sensor to turn off?
•Observe the security light located in the instrument cluster, after approximately 10 minutes the security light will turn OFF. Turn OFF the ignition, and wait 5 seconds. •The vehicle is now ready to relearn the Passlock Sensor Data Code and/or passwords on the next ignition switch transition from OFF to CRANK.
What are the sensors on a GM PassLock?
The Passlock III antenna and the Passlock I and Passlock II sensors in the lock cylinder are all commonly referred to as Passlock sensors. Upon receipt of the code from the sensor, the Passlock module will match the code received to previously learned values.
B2947: SHORT TO GROUND ON THE PASSLOCK SENSOR POWER CIRCUIT The BCM sets this code if it sees a short to ground on the Passlock sensor power circuit (white wire) for one second. The test occurs with the ignition switch in the ACCESSORY, ON, or START position.