Where is the fault in the PassLock system?
Well, here are my thoughts. The fault in the PassLock system is almost always a bad sensor located in the lock cylinder case. When you insert the key and rotate the lock cylinder, a magnet passes by a sensor and the sensor sends a voltage to the body control module (BCM). The BCM has been programmed to expect a certain voltage.
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.
What happens when you bypass the PassLock system?
The BCM has been programmed to expect a certain voltage. If it receives the expected voltage, it sends a start signal to the PCM. When you bypass the passlock system you’re basically taking the lock cylinder case sensor out of the picture.
How is the are code generated in a PassLock system?
The Passlock system requires that the key cylinder be mechanically turned using a key. When the key cylinder is properly turned, it generates the R-Code, which is sent to the Instrument Panel Cluster (IPC) in Passlock I systems or the Body Control Module (BCM) in Passlock II systems.
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.
Well, here are my thoughts. The fault in the PassLock system is almost always a bad sensor located in the lock cylinder case. When you insert the key and rotate the lock cylinder, a magnet passes by a sensor and the sensor sends a voltage to the body control module (BCM). The BCM has been programmed to expect a certain voltage.
What happens when the PassLock code is clear?
The BCM will enter fail enable mode and will allow the engine to start and run. The SECURITY light will be ON steady. The code will clear once the BCM senses normal voltage, but will store the code as a history code for the next 100 concurrent ignition cycles.
What does the history code on the BCM mean?
The BCM will then enter the code as a “history” code and store it there for the next 100 starts. If you do NOT fix the short, you CANNOT clear the code. This code sets if the BCM detects battery voltage on the sensor circuit (yellow wire) for more than 1-sec AFTER the ignition switch has been turned to OFF.