Circuit Description
The body control module (BCM) will read an analog voltage form the Passlock™ sensor. Based on an internal reference, the BCM will determine if the measured voltage is in one of the following conditions:
| • | Open |
| • | Shorted to ground |
| • | A valid code |
| • | A tamper code |
There are 10 possible valid code combination. The BCM will only recognize the last learned valid code.
Conditions for Setting the DTC
| • | The 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 telltale 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 telltale 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. |
| • | Using a scan tool. |
Diagnostic Aids
| • | When replacing the Passlock™ sensor, all of the following components are included as a replacement part and must be replaced: |
| - | The lock |
| - | The sensor |
| - | The filter |
| - | The harness |
| • | Use a scan tool in order to inspect the Passlock™ data voltage and the Passlock™ code. |
| • | Inspect the Passlock™ sensor harness for an intermittent or a short to battery. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems. |
Test Description
The numbers below refer to the step numbers on the diagnostic table:
Step | Action | Value(s) | Yes | No | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | Did you perform the Theft Deterrent (VTD) Diagnostic System Check? | -- | 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 B2947, B2948, B2957, or B2958? | -- | Go to Step 4 | |||||||||||||||||||||||||
4 | Have you replaced the Passlock™ sensor on this vehicle? | -- | Go to Step 5 | Go to Step 6 | ||||||||||||||||||||||||
5 | Have you performed a Passlock™ learn procedure after replacing the Passlock™ sensor? | -- | Go to Step 6 | Go to Step 9 | ||||||||||||||||||||||||
With a scan tool, observe the Passlock™ data voltage for one minute. Does the scan tool indicate that the Passlock™ data voltage is changing more than the specified value? | +/- 0.02v | Go to Step 7 | Go to Step 9 | |||||||||||||||||||||||||
7 | Inspect for poor connections at the Passlock ™ sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 8 | ||||||||||||||||||||||||
8 | Replace the Passlock™ sensor in the electronic column lock module assembly. Use the appropriate procedure from the following list:
Did you complete the replacement? | -- | Go to Step 9 | -- | ||||||||||||||||||||||||
9 | Perform one of the following Passlock™ learn procedures:
Is the repair complete? | -- | Go to Step 10 | -- | ||||||||||||||||||||||||
10 |
Does the DTC reset? | -- | Go to Step 3 | System OK |
