HEXA

HVAC 72 NOTE Apply torque of 1.57 Kg-m 23.9 DIAGNOSTICS USING BLINK CODES The diagnostics of the HVAC control unit can be done by activating the diagnostic mode of the control unit. The active faults present in the system can be retrieved through the blink codes. NOTE This section is applicable only for vehicles with man- ual HVAC. Vehicles with FATC system should use diagnostic tool to read the faults. A ACTIVATING DIAGNOSTICS MODE The diagnostics mode on the Manual control head shall be entered by pressing the A/C Request pushbutton as shown in Figure below. The diagnostic mode shall be activated only if the following criteria are met: a. Blower Switch is in OFF position b. A/C Key is held pressed for at least 5 seconds after ignition is turned ON. When the diagnostic mode is active, it shall be dis- played by flashing the Rear Defrost LED at the rate indicated below in Table below. Rear Defrost LED Flashing Characteristics ON Duration 2 seconds OFF Duration 2 seconds NOTE When the system is in diagnostic mode the normal operations of the control unit is suspended. 1. At this point you can query the active faults by pressing the AC button. 2. If there are active faults in the system the AC LED will glow continuously without flashing.