Mode Control Actuator Repair Procedures

Inspection

1. 1
   Turn the ignition switch to the OFF position.
2. 2
   Disconnect the mode control actuator connector.
3. 3
   Make sure the mode control actuator operates in the defrost mode when 12 V is applied to terminal 3 and ground terminal 4. Make sure the mode control actuator operates in the vent mode when the connections are reversed.

   

   1.- 2.- 3. Defrost mode 4. Sensor ground

   5. Actuator with feedback 6. Sensor (+5V) 7. Vent mode

4. 4
   Connect the mode control actuator connector.
5. 5
   Start.
6. 6
   Check the voltage between terminals 6 and 5. Specification

   Door Position	VOLTAGE (V)	Fault Detection
   VENT	0.5 ± 0.15 V	Low voltage: 0.1 V or less
   Heater	4.5 ± 0.15 V	High voltage: 4.9 V or more

   
   There will be feedback on the current position from the actuator to the control unit.
7. 7
   If the measured voltage is not within the specification, replace the mode control actuator with a known good one and check that it operates properly.
8. 8
   If there is a problem with the mode control actuator, replace it.

Diagnosis with GDS

1. 1
   The heating, ventilation and air conditioning (HVAC) system can be diagnosed quickly (defective parts) using the Global Diagnostic System (GDS). ※ The GDS provides the following information. (1) Self-diagnosis: checks and displays diagnostic trouble codes (DTC). (2) Current data: checks the status of input/output signals. (3) Active test: checks system operating conditions. (4) Additional functions: in addition to control, such as zero point adjustment.
2. 2
   Select the "Vehicle Model" and the system to be checked in order to inspect the vehicle with the scan tool.
3. 3
   Select the "Current Data" menu to check the current status of the input/output data. The input/output data for the sensors corresponding to the mode control actuator command can be checked.

   

4. 4
   To perform a forced operation on the inputs of the mode control actuator, select "ACTUAL TEST" in the mode control menu.

   

REPLACEMENT

1. 1
   Disconnect the negative (-) battery terminal.
2. 2
   Remove the instrument panel assembly from the protective pad. (Refer to Instrument Panel - "Main Panel")
3. 3
   Disconnect the connector (A), then remove the mode control actuator (B) after loosening the mounting screws.

   

4. 4
   To install, perform the removal procedure in reverse order.