Normal Operation
The stop safely now display informs the driver that there is a problem with the hybrid electrical system and that an impending vehicle shut down is about to occur. The Instrument Cluster (IC) receives the hazard input from a message over the High Speed Controller Area Network (HS-CAN) communication bus from the PCM, the Transmission Control Module (TCM) and the Battery Control Module - High Voltage Traction Battery (BCM-HVTB).
If the hazard status message is missing from the PCM or if the data is deemed invalid by the IC for more than 5 seconds, the IC sets DTC U0100 in continuous memory. If the hazard status message is missing from the TCM or if the data is deemed invalid by the IC for more than 5 seconds, the IC sets DTC U0101 in continuous memory. If the hazard status message is missing from the BCM-HVTB or if the data is deemed invalid by the IC for more than 5 seconds, the IC sets DTC U0111 in continuous memory.
If any one of the 3 messages are missing with the other two valid, the IC defaults the STOP SAFELY NOW warning to the last observable state (on or off). If all 3 messages are missing and the IC does not see an ignition switch transition into RUN/START, the IC defaults the STOP SAFELY NOW warning to the last observable state (on or off).
This pinpoint test is intended to diagnose the following:
- PCM
- TCM concern
- BCM-HVTB concern
- IC