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Home >> Mercury >> 2009 >> Mariner Base, 2.5 7, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (HVAC Climate Control System - General Information And Diagnostics - (Hybrid)) >> Diagnosis And Testing >> Climate Control System >> Pinpoint Tests >> Normal Operation >> Notes

Normal Operation: Notes

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

Under normal operation, voltage is supplied to the A/C low charge protection switch through circuit CBK03 (GY). When the A/C low charge protection switch is closed (ON, pressure normal), voltage is sent to the dual-function pressure switch through circuit CH422 (VT). When the dual-function pressure switch is closed (ON, pressure normal), voltage is provided to the PCM. Ignition voltage is provided to the A/C clutch relay switch through circuit SBB13 (GY/RD). When A/C is requested, a message is sent over the Medium Speed Controller Area Network (MS-CAN) bus to the PCM. When the PCM energizes the relay, ignition voltage is supplied to the A/C clutch through circuit CH401 (VT/WH). Ground is supplied for the A/C clutch through circuit GD123 (BK/GY).

This pinpoint test is intended to diagnose the following: 

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