Circuit Description
The body control module (BCM) receives a vehicle security powertrain status message from the powertrain control module (PCM) through the class 2 serial data link when turning the ignition switch ON.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B3094 No Response From ECM/PCM Received
Conditions for Setting the DTC
The BCM sets DTC B3094 when the BCM does not receive a vehicle security powertrain status message from the PCM within one minute of turning the ignition switch ON.
Action Taken When the DTC Sets
| • | The BCM stores DTC B3094 in memory. |
| • | The BCM sends a message to the instrument cluster to turn on the SECURITY indicator. |
Conditions for Clearing the DTC
| • | B3094 DTC status changes from current to history when the BCM receives the vehicle security powertrain status message from the PCM. |
| • | A history DTC will clear after 100 consecutive ignition cycles if the condition for the fault is no longer present. |
Diagnostic Aids
| • | The following conditions may cause an intermittent malfunction to occur: |
| - | An intermittent open in the class 2 serial data link between the BCM and the PCM |
| - | Poor connections at the BCM, PCM, or the vehicle star connector |
| • | If DTC B3094 is set as a current DTC, a serial data communication malfunction exists. Refer to Symptoms - Computer/Integrating Systems in Computer/Integrating Systems. |
| • | DTC P1626 will set in the PCM, when the ignition switch is on with the BCM disconnected. |
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Theft Deterrent System Schematics | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Does the scan tool display B3094 as a current DTC? | Go to Diagnostic Aids | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems |
