Circuit Description
The PASS-Key® III Theft Deterrent Module performs an internal test in order to determine if a valid key is present every 300 milliseconds. If the test determines that a invalid key is present the Pass-Key® III module will indicate an invalid coded key is current.
Conditions for Setting the DTC
At the beginning of the ignition cycle the Pass-Key® III module detects a invalid coded key.
Action Taken When the DTC Sets
| • | DTC B2721 is stored in the Pass-Key® III module memory. |
| • | The security indicator is illuminated. |
Conditions for Clearing the DTC
| • | The Pass-Key® III module detects a valid coded key. |
| • | A history DTC will clear after 50 consecutive ignition cycles if the condition for the malfunction is no longer present. |
| • | Use a scan tool. |
Diagnostic Aids
Inspect all of the vehicle ignition keys and inspect the invalid keys for damage.
Test Description
The numbers below refer to the step numbers on the diagnostic table:
-
Perform the Theft Deterrent Diagnostic System Check before continuing with the diagnosis of this DTC.
-
Clear all DTCs and cycle the ignition in order to verify that the DTC did not falsely set.
-
Clear all DTCs after the repair procedure is complete.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Was the Theft Deterrent Diagnostic System Check performed? | -- | Go to Step 2 | ||
Is the DTC still present? | -- | Go to Step 3 | ||
3 | Replace the Pass-Key® III module. Refer to Theft Deterrent Module Replacement . Did you complete the repair? | -- | Go to Step 4 | -- |
Are DTCs cleared? | -- | -- |
