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For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2005 🢒 CTS 🢒 Accessories 🢒 Navigation Systems 🢒 DTC B3976

Circuit Description

When the theft deterrent control module is in the learn coded key mode or learn more keys mode and the crypt valet mode is enabled the theft deterrent control module checks the passkey III plus key to insure it has been configured as a master key or a valet key.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B3976 Unconfigured Transponder

Condition for Running the DTC
    • The ignition switch is in the ON position.
    • The theft deterrent control module is in the learn coded key mode or learn more keys mode.
    • The crypt valet mode is enabled in the theft deterrent control module.

Conditions for Setting the DTC

The theft deterrent control module has determined that the passkey III+ (PK3+) key has not been configured as a master key or a valet key.

Action Taken When the DTC Sets
    • The vehicle will not start.
    • The theft deterrent control module sends a message via the serial data circuit to the radio to display SERVICE THEFT SYSTEM.
    • The theft deterrent control module sends a message via the serial data circuit to the instrument panel cluster (IPC) to illuminate the SECURITY indicator.

Conditions for Clearing the MIL/DTC
    • The Theft Deterrent control module clears the current DTC when the condition for setting is not present and the ignition is cycled from OFF to ON.
    • The DTC can be cleared by using a scan tool.

Test Description

The numbers below refer to the step numbers on the diagnostic table:

  1. Verifies the conditions for setting DTC B3055 or B3060 are not current.

    2.

  2. The key must have the proper mechanical cut and the theft deterrent control module must "learn" the transponder value.

Step

Action

Yes

No

Schematic Reference: Theft Deterrent System Schematics

Connector End View Reference: Theft Deterrent System Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2

Is DTC B3055 or B3060 set as a current code?

Go to DTC B3055 or DTC B3060

Go to Step 3

3

Important: Two learned master keys are required to perform the Adding Keys procedure on export vehicles with option code (UA2 OR Z49)

  1. Replace the suspect key.
  2. Copy the mechanical cut of the available key on a pass key III+ (PK3+) replacement key.
  3. Perform the Adding Keys procedure if a learned master key is available. Refer to Adding Keys . If the required number of learned master keys are not available. Refer to Replacing Keys .

Did you complete the replacement?

Go to Step 4

--

4

  1. Use a scan tool in order to clear the DTCs.
  2. Attempt to start the vehicle.

Does the DTC reset?

Go to Step 2

System OK