Circuit Description
The body control module (BCM) will read an analog voltage from the Passlock sensor. Based on the Passlock internal reference, the BCM will determine if the indicated voltage is 1 of the following conditions:
| • | Open |
| • | Shorted to ground |
| • | A valid code |
| • | A tamper code |
In the case of a tamper code the BCM is reading a tamper code.
Conditions for Setting the DTC
| • | The BCM will inspect for a tamper code when the ignition switch rotates from ON to CRANK and will continue to monitor the signal during the engine running period. |
| • | The BCM is reading a tamper code from the Passlock sensor for longer than 1.0 seconds. |
Action Taken When the DTC Sets
| • | The vehicle will not run. The security telltale will be flashing. |
| • | The Passlock state is Tamper. |
Conditions for Clearing the DTC
| • | The DTC will clear once an ignition cycle occurs without the fault recurring. |
| • | The BCM history codes will clear after 100 ignition cycles occur without the fault recurring. |
| • | Use a scan tool. |
Diagnostic Aids
| • | Prior to replacing a BCM, ensure that all of the diagnostics have been completed. Refer to Diagnostic Trouble Code (DTC) Displaying in Body Control Systems. |
| • | Perform a visual inspection of the wiring and the connectors. |
| • | Inspect the Passlock sensor harness for intermittent or poor connections. Refer to Intermittents and Poor Connections Diagnosis in Wiring Systems. |
| • | The VTD internal diagnostics are not run while the tamper timer is active. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
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This step determines if DTC B3033 is intermittent.
-
This step inspects for a mechanical problem.
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Replace the Passlock sensor. This sensor is the only component able to produce the voltage window necessary in order to set DTC B3033.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Vehicle Theft Deterrent (VTD) System Check? | -- | Go to Step 2 | |
Did DTC B3033 clear? | -- | Go to Intermittents and Poor Connections Diagnosis in Wiring Systems | Go to Step 3 | |
Inspect the key switch mechanical assembly. Is there binding or has the cylinder magnet been damaged? | -- | Go to Step 4 | Go to Step 5 | |
4 | Replace the ignition cylinder assembly. Refer to Ignition Lock Cylinder Replacement - On Vehicle in Steering Wheel and Column-Tilt. Is the repair complete? | -- | -- | |
Is the repair complete? | -- | Go to Step 7 | Go to Step 6 | |
6 | Replace the body control module. Refer to Body Control Module Replacement in Body Control Systems. Is the repair complete? | -- | Go to Step 7 | -- |
7 |
Is the operation complete? | -- | -- |
