Durango 2WD V8-5.7L Hybrid (2009)
Malfunction Indicator Lamp - Hybrid Drive: Description and Operation
Hybrid Service Indicator - Operation
OPERATION
The Hybrid Electric Vehicle (HEV) service indicator gives an indication to the vehicle operator when the Hybrid Control Processor (HCP) integral to the
Traction Power Inverter Module (TPIM) has recorded a Diagnostic Trouble Code (DTC) for a hybrid systems-related circuit or component malfunction.
The HEV service indicator is controlled by a transistor on the instrument cluster circuit board based upon cluster programming and electronic messages
received by the cluster from the HCP over the Controller Area Network (CAN) data bus.
The HEV service indicator Light Emitting Diode (LED) is completely controlled by the instrument cluster logic circuit. This logic only allows the
indicator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the LED
is always off when the ignition switch is in any position except ON or START. The LED only illuminates when it is provided a path to ground by the
instrument cluster transistor. The instrument cluster turns on the HEV service indicator for the following reasons:
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Bulb Test - Each time the ignition switch turns to the ON position the indicator is illuminated for about four seconds as a bulb test. The entire bulb
test is a function of the HCP.
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HEV Service Lamp-On Message - Each time the cluster receives an electronic HEV service lamp-on message from the HCP, the indicator
illuminates. For some DTCs, if a problem does not recur, the HCP sends a lamp-off message automatically. Other DTCs may require that a fault
be repaired and the HCP be reset before a lamp-off message is sent.
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Self Test - Each time the cluster is put through the self test, the HEV service indicator will be turned ON during the bulb check portion of the test
to confirm the functionality of the LED and the cluster control circuitry.
The HCP continually monitors the HEV system circuits, sensors and components to decide whether the system is in good operating condition. The HCP
then sends the proper lamp-on or lamp-off message to the instrument cluster also known as the Cab Compartment Node (CCN). For further diagnosis of
the HEV service indicator or the instrument cluster circuitry that controls the LED, See: Instrument Cluster / Carrier/Testing and Inspection. If the CCN
turns on the HEV service indicator after the bulb test, it may indicate that a malfunction has occurred and that the HEV system may require service.
Use a diagnostic scan tool for proper diagnosis of the HEV system, the HCP, the CCN, the CAN data bus or the electronic communication related to
HEV service indicator operation. Refer to the appropriate diagnostic information.
