U1152

DTC U1152 - Loss Of Serial Communications - HCM:

CIRCUIT DESCRIPTION
While the ignition switch is in "RUN" modules communicating on the Class 2 Data Bus send a "State of Health" (SOH) message every 5 seconds to ensure that the system is operating properly.

CONDITIONS FOR SETTING THE DTC
The Body Control Module (SBM) does not receive a SOH message from the HCM after three consecutive monitoring cycles.

CONDITIONS FOR CLEARING THE DTC
The HCM transmits a SOH message to the SBM.

DIAGNOSTIC AIDS
1. If there are multiple Class 2 Diagnostic Trouble Code (DTCs) (i.e. DTCs U1300, U1301, U1160, U1152), check for a intermittent short to power or ground in CKT 1807 (PPL).
2. If DTC is current attempt to establish communications with the HCM using a scan tool.
^ If communications can not be established with the HCM.
^ If communications can be established with the HCM then replace SBM.