Control Module HVAC: Testing and Inspection

INSPECTION OF A/C CONTROLLER AND ITS CIRCUITS

CAUTION: A/C controller and ECM cannot be checked by itself. It is strictly prohibited to connect voltmeter or ohmmeter to A/C controller and ECM with couplers disconnected from it.

A/C Controller:

A/C Controller (1) and its circuits can be checked at A/C controller wiring couplers by measuring voltage.

Fig.A, Fig. B, Fig. C:

VOLTAGE CHECK
1. Remove A/C controller (1) from vehicle referring to "A/C CONTROLLER".
2. Remove ECM (2) from vehicle.
3. Connect A/C controller couplers to A/C controller and connect ECM couplers to ECM.
4. Check each terminal voltage with couplers connected by referring to "A/C CONTROLLER VOLTAGE VALUES TABLE".

NOTE: For "Fig. A", "Fig. B", "Fig. C" in the figure, refer to "A/C CONTROLLER VOLTAGE VALUES TABLE".

System Circuit:

Terminal Arrangement Of A/C Controller:

Terminal Arrangement Of ECM:

A/C Controller Voltage Values Table (Part 1):

A/C Controller Voltage Values Table (Part 2):