B3055

DTC B3055

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructionsprovides an overview of each diagnostic category.

DTC Descriptor
DTC B3055 00
- No Transponder Modulation or No Transponder

Circuit/System Description

When a keyless entry transmitter is inserted into the transmitter pocket/slot and the ignition mode switch is pressed, the transponder embedded in the transmitter is energized by the immobilizer antenna exciter coil. The transponder transmits a signal to the body control module (BCM). The BCM then compares this value to a value stored in memory. If the value is correct, the BCM will send the prerelease password via the serial data circuit to the engine control module (ECM). If the learned key code does not match or a transponder value is not received, the BCM will send the start disable password to the ECM.

Conditions for Running the DTC

Ignition is in the Accessory or Run position.

Conditions for Setting the DTC

The BCM is unable to measure the transponder value.

Action Taken When the DTC Sets

* Vehicle starting will be disabled.
* The security indicator will illuminate. A service message will be displayed in the driver information center.

Conditions for Clearing the DTC

* A current DTC will be cleared when the BCM detects a valid transponder value from the transmitter.
* A history DTC will be cleared after 100 malfunction-free ignition cycles.

Reference Information
Schematic Reference

Immobilizer Schematics Immobilizer Schematics
Connector End View Reference

Component Connector End Views Connector End Views By Name
Description and Operation

Immobilizer Description and Operation Immobilizer
Electrical Information Reference

* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module Referencesfor scan tool information

Circuit/System Verification

1. Ignition ON.
2. Verify all available keyless entry transmitters are correct for the vehicle. This can be accomplished by comparing the part number that is laser etched on the transmitter to the part number listed in the parts catalog.

• If a transmitter is not correct
Replace the key

• If all transmitter are correct

3. Verify the scan tool BCM Key Part Number parameter displays a Key Part Number when turning the ignition ON with each transmitter.

• If a Key Part Number is not read
Replace the appropriate transmitter.

• If a Key Part Number is read for each transmitter

4. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

Remote Control Door Lock and Theft Deterrent Transmitter Programming Testing and Inspection