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 Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC B3055 00
- No Transponder Modulation or No Transponder Malfunction
Circuit/System Description
When an ignition key is inserted into the ignition lock cylinder and the ignition is switched ON, the transponder embedded in the key is energized by the exciter coils surrounding the ignition lock cylinder. 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 ignition key transponder value.
Action Taken When the DTC Sets
* Vehicle starting will be disabled.
* The security indicator in the instrument cluster will be illuminated. 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 ignition key.
* A history DTC will be cleared after 100 malfunction-free ignition cycles or when a scan tool is used to clear DTCs.
Diagnostic Aids
The immobilizer system is not designed to have the key folded 90 degrees when attempting to start the engine. This may cause an intermittent no start condition. If you receive a customer complaint of an intermittent no start condition, verify that the customer is not folding the key while attempting to start the engine. The fob must be parallel to the key to function properly.
Reference Information
Schematic Reference
Immobilizer Schematics (Immobilizer Schematics)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Immobilizer Description and Operation (Immobilizer Description and Operation)
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 (Programming and Relearning) for scan tool information
Circuit/System Testing
1. Inspect all available vehicle keys that they are correct vehicle keys.
• If not a correct vehicle key, replace the key.
2. While viewing the scan tool BCM Key Part Number, turn ON the ignition with each of the available vehicle keys. The parameter should read a Key Part Number with all available keys.
• If only one key results in the parameter reading no Part Number, replace the appropriate key.
3. Ignition OFF, disconnect the harness connector at the K64 Content Theft Deterrent Control Module and disconnect the harness connector X3 at the K9 BCM, test for infinitive resistance between the signal circuit listed below and ground.
* K9 BCM terminal 1 X3
* K9 BCM terminal 2 X3
* K9 BCM terminal 3 X3
• If less than the specified range, test the appropriate signal circuit for a short to ground.
4. Test for less than 0.3 V between the signal circuit listed below and ground:
* K9 BCM terminal 1 X3
* K9 BCM terminal 2 X3
* K9 BCM terminal 3 X3
• If greater than the specified range, test the appropriate signal circuit for a short to voltage.
5. Test for less than 5 ohm between the signal circuit terminal listed below at the K9 BCM and the signal circuit terminal listed below at the K64 Content Theft Deterrent Control Module.
* K9 BCM terminal 1 X3 and K64 Content Theft Deterrent Control Module terminal 1
* K9 BCM terminal 2 X3 and K64 Content Theft Deterrent Control Module terminal 2
* K9 BCM terminal 3 X3 and K64 Content Theft Deterrent Control Module terminal 3
• If greater than the specified range, test the appropriate signal circuit for an open/high resistance.
6. If all circuits test normal, replace the K64 Content Theft Deterrent Control Module and verify that the customer concern is not still present.
• If the customer concern is still present, replace the K9 BCM.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Replacing Keys (Erases All Existing Keys) (Replacing Keys (Erases All Existing Keys))
* Control Module References (Programming and Relearning) for BCM and remote function receiver module replacement, setup and programming