Body Control Module (BCM)

90d5-LOST COMMUNICATION WITH SBM (SWITCH BANK MODULE)





For a complete wiring diagram, Refer to the Wiring Information Electrical Diagrams.

- When Monitored:
With the ignition on.

Battery voltage between 10 and 16 volts.

Ignition Off Draw (IOD) fuse installed.

EIS (CGW) is configured correctly.

- Set Condition:
Bus messages not received from the SBM for approximately two to five seconds.





1. VERIFY DTC IS ACTIVE

NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.

1. With the scan tool, read active DTCs.

Is this DTC active?

Yes

- Go To 2

No

- Perform The Stored Lost Communication diagnostic procedure.Stored Lost Communication DTCs

2. CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS
1. With the scan tool, read active DTCs from all modules.

NOTE: Check for EIS (CGW) configuration, CAN C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs.

Does the scan tool display any active DTCs to the conditions listed above?

Yes

- Perform the appropriate diagnostic procedure.

No

- Go To 3

3. VERIFY THAT THE SBM IS ACTIVE ON THE BUS
1. Turn the ignition on.
2. With the scan tool, select Network Diagnostics.
3. Verify that the SBM is active on the bus.

Is the SBM active on the bus?

Yes

- Go To 4

No

- Perform the No Response from SBM diagnostic procedure.No Response From SBM (Switch Bank Module)

4. CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS
1. With the scan tool, select Network Diagnostics.

Is there more than one module with active DTCs "Logged Against" the SBM?

Yes

- Replace/update the Switch Bank Module.
- Perform the BODY VERIFICATION TEST Verification Tests.

No

- Replace/update the module that set this DTC.
- Perform the appropriate VERIFICATION TEST. Verification Tests