Circuit Description
The Passlock™ system is provided in order to prevent vehicle theft if the ignition lock cylinder is forced to rotate. The Passlock™ controller reads the coded Passlock™ data signal. The data consists of a voltage generated by a voltage divider network created between the Passlock™ assembly and the Passlock™ controller. If the data is correct , indicating rotation of the lock cylinder with the proper mechanically cut key, then the Passlock™ controller sends a password to the powertrain controller via serial data to indicate that engine starting should be allowed. The Passlock™ controller also interfaces with the driver displays subsystem to indicate, via the security indicator, the Passlock™ subsystem status and acute subsystem failures.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B2960 Security System Sensor Data Incorrect but Valid
DTC Symptom | DTC Symptom Descriptor |
|---|---|
00 | No Additional Information |
Conditions for Setting the DTC
| • | The body control module (BCM) will inspect for a valid code when the ignition is rotated from ON to CRANK and will continue to monitor the signal during the engine running period. |
| • | The BCM is reading a valid but different code value than previously learned form the Passlock™ sensor. |
Action Taken When the DTC Sets
| • | The vehicle will not start if the fault occurs before you start the vehicle. The security indicator will be FLASHING. |
| • | If the vehicle is running when the fault occurs, the BCM will be in the fail enable mode allowing the vehicle to start and run. The security indicator will be ON. |
Conditions for Clearing the DTC
| • | The DTC will clear once an ignition cycle occurs without the fault recurring. |
| • | The BCM history codes will clear once 100 concurrent ignition cycles occur without the fault recurring. |
| • | The DTC can be cleared using a scan tool. |
Diagnostic Aids
| • | Use a scan tool in order to inspect the Passlock™ data voltage and the Passlock™ code. |
| • | Inspect for poor connections at the Passlock™ sensor. Refer to Testing for Intermittent Conditions and Poor Connections . |
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Theft Deterrent System Schematics | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
2 |
Does the scan tool display DTC B2960 as a current DTC? | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections |
3 | Does the scan tool display DTC B2957, B2958 or B3033? | Go to Step 4 | |
4 | Have you performed the Passlock™ learn procedure? | Go to Step 5 | Go to Step 7 |
5 | Inspect for poor connections at the Passlock™ sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 8 | Go to Step 6 |
6 | Replace the Passlock™ sensor. Refer to Ignition and Start Switch Replacement . Did you complete the replacement? | Go to Step 8 | -- |
7 | Perform the Programming Theft Deterrent System Components procedure. Is the repair complete? | Go to Step 8 | -- |
8 |
Does the DTC reset? | Go to Step 3 | System OK |
