DTC 75: Ac Request Output Signal High When Driven Low

For complete wiring diagrams refer to:

SYSTEM WIRING DIAGRAMS for 300.
SYSTEM WIRING DIAGRAMS for Charger.

When Monitored:
With the ignition on.
Set Condition:
If the A/C Heater Control detects voltage above 4.49 volts on the (C105) HVAC MUX Control circuit with the A/C switched on.

NOTE: This DTC must be active for the results of this test to be valid. Do not perform this test if this DTC is stored. Refer to HVAC SYSTEM TEST (MTC) .