When the blower is turned ON, blower relay becomes turned ON and battery voltage is supplied to the blower motor upper part. The current determined by the supplied battery voltage, blower motor, and register ground runs toGND through the blower motor and the selected blower single resister.
Symptoms | Possible causes | How to check |
Blower malfunction | Short wire of register | |
Blower wind is discharged despite switching OFF | Open circuit of blower switch | With switch OFF, check the connection between each terminal and GND/COMMON terminal |
For A/CON output, blower must be basically operated. When blower speed 1 is selected, blower relay is turned ON and voltage is supplied to point"A".
When the supplied voltage at point "A" is entered into control connector pin 3 and at this moment when A/CON switch is turned ON, voltageis supplied to connector pin 11 at 9V or more.
EVA sensor value determines whether the input power at point "B" is supplied to point "C".
The state of ON/OFF of triple switch determines whether the input power at point "C" is supplied to point "D".
Finally when the voltage is supplied to point "D", engine ECU determines whether A/CON and CONDENSER FAN turned ON/OFF.
Symptoms | Possible causes | How to check |
Wind of A/CON isn't discharged into in-car despite switching OFF of A/CON | Signal output error of A/CON | With switch OFF of A/CON, and measure voltage of connector terminal 11 as shown in the above figure. If the voltage is 9V or more, check the tripleswitch, ENG ECU, and wires. |
In turning on IG and selecting outdoor mode with indoor switch, 12V is outputted from connector terminal 5, 0V is supplied for terminal 13 and motor works in direction of outdoor. In selecting indoor mode with indoor switch, 12V is outputted from connector terminal 13, 0V is supplied for terminal5 and motor works in direction of indoor.
Symptoms | Causes | How to check |
Outdoor mode running error | Power supply error in actuator | Separate connector linked with actuator, select outdoor mode with indoor switch and measure voltage of connector terminal 5. If 9V and more, check actuator or wiring state and if 9V and less, check the inside of controller. |
Indoor mode running error | Power supply error in actuator | Select indoor mode in the above method and measure voltage of connector terminal 13. If 9V and more, check actuator or wiring state and if 9V andless, check the inside of controller. |
As shown in the above figure, in adjusting temp. switch from WARM to COOL, 12V is outputted from temp. connector terminal 4, 0V is supplied for terminal 3 and temp. motor works in direction of COOL. In adjusting temp. switch from COOL to WARM, 12V is outputted from temp. connector terminal 3, 0V is supplied for terminal 4 and temp. motor works in direction of WARM. When temp. actuator has to move to a certain location for its automatic control, temp. feedback signal terminal moves equally in temp. actuator and informs controller of location of temp. actuator through temp. connector terminal 6. Comparing original value with the inputted value, it works until they aresame.
Symptoms | Causes | How to check |
Temp actuator running error | Power supply error in temp actuator | After altering COOL to WARM, measure voltage of terminal 4, and after altering WARM to COOL, measure voltage of terminal 3. If Both of them are 9V and more, check temp actuator and peripheral wiring state and if one orboth of them are 9V and less, its cause is internal failure of control. |
In turning on IG and selecting mode switch, each selected mode works. In selecting Vent mode as mode switch, GND(0V) is supplied for connector terminal 6. Voltage of 9V and more is set in the rest terminals (7, 8, 14,15) and motor drive IC in mode actuator which receives the signal, works in direction of vent mode setup. Vent, Built-in-level, Blower, Mix and Defrost mode can beselected in the method described above.
Symptoms | Causes | How to check |
Specific mode isn't selected. | Signal transmission error of selected mode | Measure voltage of selected mode wiring without separating connector linked with actuator. If 8V and more, check theinside of controller. |
Mode actuator running error | If 1V and less at measuring in the above method, check mode actuator and wiring state. | |
Mode selection is impossible | Internal error of mode actuator | If motor driver IC built in mode actuator is bad, mode selection is impossible. When mode isn't selected though GND(0V) is supplied for selected mode wiring after selecting mode in controller, itscause is internal failure of mode actuator. |
Power supply check
Back light and Rear glass heat rays check
Blower check
Air conditioner check
Intake check and AQS check
Mode check
Temp check
