Circuit Description
The 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.
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 ignition switch on.
Action Taken When the DTC Sets
| • | The BCM stores DTC B3094 in memory. |
| • | The SERVICE VEHICLE SOON indicator lamp turns on. |
| • | The BCM sends a message to the instrument cluster to turn on the SECURITY indicator lamp through the Class 2 serial data link. |
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. |
| • | Using a scan tool. |
Diagnostic Aids
| • | The following conditions may cause an intermittent malfunction to occur: |
| - | An intermittent open in circuit 1049 or 1037. |
| - | Poor connections at the BCM, PCM, or Splice Pack SP205. |
| - | The BCM is open internally. |
| • | The BCM may store DTC B3094 if certain diagnostics are performed between the Powertrain Control Module (PCM) and the Data Link Connector (DLC). |
| • | DTC P1626 will set in the Powertrain Control Module (PCM) when the ignition switch is on with the Body Control Module (BCM) disconnected. When BCM diagnostics and repairs are completed, refer to Engine Controls for additional information on PCM related DTCs. |
Test Description
The number below refers to the step number on the diagnostic table.
This step 4 determines whether the malfunction is intermittent or the BCM is faulty.
Step | Action | Yes | No |
|---|---|---|---|
1 | Install a scan tool. Does the scan tool power up? | Go to Step 2 | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications |
2 | Inspect that the PCM is the correct type for the vehicle. | Go to Step 3 | Go to Powertrain On Board Diagnostic (OBD) System Check (3.1) or Powertrain On Board Diagnostic (OBD) System Check (3.8)in Powertrain Controls |
3 | Was the Body Control System Check performed? | Go to Step 4 | |
4 | With scan tool, attempt to communicate with the PCM. Does the scan tool communicate with the PCM? | Go to Step 5 | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications |
5 | With scan tool observe status of DTC B3094. Does the scan tool indicate that DTC B3094 is current? | Go to Step 6 | Go to Step 7 |
6 | Replace the BCM.Refer to Body Control Module Replacement Body Control Module Replacement. Refer to Body Control Module (BCM) Programming/RPO Configuration BCM Programming/RPO Configuration Did you Complete the Replacement? | System Ok | -- |
7 | Clear DTC Is System operating normal? | System Ok | -- |
