Schematic
Refer to
Vehicle Theft Deterrent Module (VTD)
schematic
Circuit Description
The vehicle theft deterrent (VTD) module checks the exciter/receiver key data signal circuit for a constant voltage condition.
Conditions for Running the DTC
The VTD must see the ignition switch input. The VTD must have DTC B3055, Key Not Present, set as a current DTC. The VTD can not have a B1327 DTC set as a current DTC.
Conditions for Setting the DTC
The VTD requires 1 second to monitor the ignition key. After the first second, the VTD turns off the power to the exciter/receiver. If the VTD module senses the key data signal circuit to the exciter/receiver is 12 V for 1 second, the VTD sets this DTC.
Action Taken When the DTC Sets
When the vehicle is running, the VTD will allow the vehicle to continue running. If the 12 V is detected on the key data signal circuit with the engine off, the VTD will prevent a start. The VTD will illuminate the security indicator.
Conditions for Clearing the DTC
The VTD clears the current status of the DTC when it does not sense a 12 V condition on the exciter/receiver key data signal circuit. The DTC will still be retrieved as current until the ignition switch is cycled. The DTC will become a history DTC at that time.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
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Be sure that the original ignition key issued with the vehicle is used when performing the Vehicle Theft Deterrent Diagnostic System Check.
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Make sure the ground used is separate from the grounds used by the vehicle theft deterrent module. Voltage measurement must not interfere with possible isolated module ground.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Did you perform A Vehicle Diagnostic System Check - Theft Deterrent ? | -- | |||
Does the voltage measure near the specified value? | 0 V | |||
3 | Test the VTD exciter/receiver signal circuit for a short to voltage. Refer to Circuit Testing in Wiring Systems . Did you find and correct the condition? | -- | ||
4 | Inspect for poor connections/terminal tension at the VTD exciter/receiver harness connector. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems . Did you find and correct the condition? | -- | ||
5 | Inspect for poor connections/terminal tension at the VTD module harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||
6 | Replace the VTD exciter/receiver. Refer to Reader/Exciter Replacement . Did you complete the replacement? | -- | -- | |
7 |
Important: Perform the vehicle theft deterrent (VTD) set up procedure. Replace the VTD module. Refer too Theft Deterrent Module Replacement . Did you complete the replacement? | -- | -- | |
8 |
Does the DTC reset? | -- | System OK |
