Body Control System
U0156-LOST COMMUNICATION WITH EOMU0158 - Lost Communication With EOM:
WHEN MONITORED
- With the ignition on
- Battery voltage between 10 and 16 volts
- IOD fuse installed
- FCM is configured correctly
SET MONITORED
Bus messages not received from the Compass Temperature Module (EOM) for approximately 2 to 5 seconds.
POSSIBLE CAUSES
- CAN B Bus circuits open or shorted
- DTCs related to battery voltage, ignition, or VIN messages
- FCM not configured correctly
- Compass temperature module (EOM)
- Compass temperature modules power or ground
- Module that set this DTC
Diagnostic Test
1. VERIFY DTC IS ACTIVE
NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.
With the scan tool, read active DTCs.
Q: Is this DTC active?
YES: Go To 2
NO: Refer to the Stored Lost Communication test procedure. Refer to the table of contents. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
2. CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCs
With the scan tool, read all active DTCs from all modules.
NOTE: Check for FCM configuration, CAN B or C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs.
Q: Does the scan tool display any active DTCs to the conditions listed above?
YES: Diagnose and repair the DTC. Refer to the Table of Contents for a complete list of the symptoms. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Go To 3
3. VERIFY THAT THE EOM IS ACTIVE ON THE BUS
Turn the ignition on.
With the scan tool, select Network Diagnostics.
Verify that the EOM is active on the bus.
Q: Is the EOM active on the bus?
YES: Go To 4
NO: for No Response diagnostic procedures. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
4. CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCs
With the scan tool, select Network Diagnostics.
Q: Is there more than one module with active DTCs "Logged Against" the EOM?
YES: Replace/update the Compass Temperature Module (EOM) in accordance with the service information. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test
NO: Replace/update the module that set this DTC in accordance with the service information. Perform BODY VERIFICATION TEST - VER 1. Body Verification Test