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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 180 (Hybrid Energy Storage System) >> Description and Operation >> Drive Motor Battery System Description >> Battery Energy Control Module (BECM) >> Output Circuits - Hybrid Drive Motor Battery Vent Fan

Output Circuits - Hybrid Drive Motor Battery Vent Fan

WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.

The hybrid drive motor battery is an air cooled component. The hybrid drive motor battery vent fan and relay are located inside the hybrid drive motor battery assembly and controlled by the BECM. The BECM monitors hybrid battery temperature air inlet and air outlet temperatures. The BECM can adjust the vent fan speed based on vehicle speed and temperature. The BECM grounds the primary side of the vent fan relay to supply voltage to the vent fan. The BECM controls the vent fan speed through a separate wire with a pulse width modulated signal (PWM). The vent fan assembly internal circuitry converts the PWM signal into fan speed.

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