DTC U1152, Loss Of Serial Communications - HVAC Programmer: Notes

When ignition is turned on, each module communicating on class 2 serial data line sends a State Of Health (SOH) message every 5 seconds to ensure system is operating properly. DTC U1152 will set if BCM does not receive a SOH message from HVAC programmer after 3 consecutive monitoring cycles. DTC U1152 will clear when HVAC programmer transmits a SOH message to BCM.