Pinpoint Test 34: The Hazard Warning Indicator Is Never/Always On

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PINPOINT TEST 34: THE HAZARD WARNING INDICATOR IS NEVER/ALWAYS ON - HYBRID

Normal Operation

The hazard warning indicator informs the driver that service on the vehicle is required. The input to the cluster is from a message over the communication network from the PCM, the transmission control module (TCM) and the traction battery control module (TBCM).If the hazard warning status message is missing or if the data is deemed invalid by the instrument cluster for more than 5 seconds, the instrument cluster sets DTC U0100 in continuous memory. If the transmission status message is missing or if the data is deemed invalid by the instrument cluster for more than 5 seconds, the instrument cluster sets DTC U0101 in continuous memory. If the traction battery status message is missing or if the data is deemed invalid by the instrument cluster for more than 5 seconds, the instrument cluster sets DTC U0111 in continuous memory.
If any one of the three messages are missing with the other two valid, the instrument cluster defaults the hazard warning indicator to the last observable state (on or off). If all three messages are missing and the instrument cluster does not see an ignition switch transition into RUN/START, the instrument cluster defaults the hazard warning indicator to the last observable state (on or off). If all three messages are missing during an ignition switch transition into RUN/START, the instrument cluster defaults the hazard warning indicator on.

Possible Causes
- Powertrain concern
- Traction battery concern
- Transmission concern
- Instrument cluster

Diagnostic Procedure

Step 1-Step 5:

Step 6: