HVAC - Diagnostics

Inspection of HVAC Control Module and its Circuit

HVAC control module and its circuits can be checked at HVAC control module wiring coupler by measuring voltage.

CAUTION: HVAC control module can not be checked by itself. It is strictly prohibited to connect voltmeter to HVAC control module with couplers disconnected from it.

Voltage Check

G77-1-G77-6:

G77-6-G77-30:

1. Remove HVAC control module referring to HVAC Control Module Removal and Installation.
2. Check voltage at each terminal as shown given.

NOTE: As each terminal voltage is affected by the battery voltage, confirm that it is 11 V or more when ignition switch is ON.