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Home >> Jeep >> 2024 >> Grand Cherokee Summit >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Hybrid Control Processor Module (HCP) - DTCS P0E7D-00 To P1503-00) >> DTC Troubleshooting >> P149A-00-Cooling Fan Module Internal >> Theory Of Operation

Theory Of Operation

WARNING: This page is about a different variant/trim than selected.

The Radiator Cooling Fan is supplied with a fused 12 volt circuit and a ground circuit. The Hybrid Control Processor (HCP) controls the radiator Cooling Fan speed with a Pulse Width Modulated (PWM) command via a Control Circuit. The HCP monitors the PWM Control circuit and will set a DTC indicating the nature of the fault. The Hybrid Control Processor (HCP) is internally located in the Power Inverter Module (PIM) and is not serviced separately.