PRE-RELEASE
DTC B2955
| DTC B2955 |
| Diagnostic Instructions |
| • |
Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
|
|
| • |
Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
|
|
| • |
Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
|
|
| DTC Descriptor |
DTC B2955 00
Security Sensor Data Circuit
| Diagnostic Fault Information |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
| B+ | B2955 00 | B2955 00 | - | - |
| Serial Data | B2955 00 | B2955 00 | B2955 00 | B2955 00 |
| Low Reference | - | B2955 00 | - | - |
| Circuit/System Description |
When a transmitter is inserted into the transmitter pocket and the ignition mode is changed, the transponder embedded in the transmitter is energized by the exciter coils located directly below the transmitter pocket. The energized transponder transmits a signal that contains its unique value, which is received by the body control module (BCM). The BCM then compares this value to a value stored in memory. If the value is not correct, the BCM disables engine starting.
| Conditions for Running the DTC |
Ignition is in the Accessory or Run mode.
| Conditions for Setting the DTC |
The BCM detects a circuit fault between itself and the immobilizer antenna.
| 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 condition for setting the DTC are no longer present.
|
|
| • |
A history DTC will be cleared after 100 malfunction-free ignition cycles or when a scan tool is used to clear DTCs.
|
|
| Reference Information |
Schematic Reference
Immobilizer Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Immobilizer Description and Operation
Electrical Information Reference
| • |
Circuit Testing
|
|
| • |
Connector Repairs
|
|
| • |
Testing for Intermittent Conditions and Poor Connections
|
|
| • |
Wiring Repairs
|
|
Scan Tool Reference
Control Module References for scan tool information
| Circuit/System Testing |
| 1. |
Ignition OFF, disconnect the harness connector at the K89 immobilizer control module.
|
|
| 2. |
Ignition OFF, test for less than 50 Ω between the low reference circuit terminal 1 and ground.
|
|
| 3. |
If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K9 BCM.
|
|
| 4. |
Connect a test lamp between the B+ circuit terminal 3 and ground.
|
|
| 5. |
While observing the test lamp, turn the ignition ON. The test lamp should illuminate or flash for three seconds.
|
|
| 6. |
If the test lamp does not illuminate or flash, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
|
|
| 7. |
Test for 11-13 V between the serial data circuit terminal 2 and ground.
|
|
| 8. |
If less than the specified range, test the serial data circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 BCM.
|
|
| 9. |
If greater than the specified range, test the serial data circuit for a short to voltage. If the circuit tests normal, replace the K9 BCM.
|
|
| 10. |
If all circuits test normal, replace the K89 immobilizer control module. Verify DTC B2955 is not set.
|
|
| 11. |
If the DTC is set, replace the K9 BCM.
|
|
| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • |
Theft Deterrent Module Replacement
|
|
| • |
Control Module References
for BCM replacement, setup, and programming
|
|
