Q45 V8-4.5L (VK45DE) (2002)
Control Module HVAC: Initial Inspection and Diagnostic Overview
TROUBLE DIAGNOSIS PROCEDURE FOR A/C SYSTEM
A/C System (Main Power Supply and Ground Circuit Check) - Inspection Flow
SYMPTOM:
*
A/C system does not come on.
MAIN POWER SUPPLY AND GROUND CIRCUIT CHECK
Component Descriptions
Automatic Amplifier (Auto Amp.)
The auto amplifier has a built-in microcomputer which processes information sent from various sensors needed for air conditioner operation. The air mix
door motor, mode door motor, intake door motor, blower motor and compressor are then controlled.
The auto amplifier is unitized with control mechanisms. When the various switches and temperature adjustment dial are operated, data is input to the
auto amp from the display (and NAVI) control unit using multiplex communication.
Self-diagnostic functions are also built into auto amplifier to provide quick check of malfunctions in the auto air conditioner system.