Control Module HVAC: Description and Operation

Wiring Diagram For A/C Clutch Circuit:

When the Electronic Climate Control (ECC) head is switched to the "ON" position and the A/C system has adequate charge, an A/C request signal is sent to the ECM. When the A/C request signal is received by the ECM, the ECM will delay grounding relay circuit 459 long enough to adjust idle speed.