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Home >> Mercury >> 2009 >> Mariner Base, 2.5 7, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 20 (HVAC Climate Control System - General Information & Diagnostics) >> Diagnostic Tests >> Climate Control System >> Pinpoint Tests >> Pinpoint Test H: The Air Conditioning (A/C) is Always On - A/C Mode Always Commanded ON >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2009 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.

Under normal operation, when A/C is requested, a ground signal is sent from the HVAC module to the Smart Junction Box (SJB) through circuit 1397 (GY/RD). The SJB then transmits an A/C request message through the High Speed Controller Area Network (HS-CAN) bus to the PCM.

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