Climate Control: Other Honda Ridgeline I

Checking for DTCs

The temperature display indicates single or multiple DTCs. If indicator segments A, C, E, G, I, L, N, and O are on at the same time, there may be an open in the common ground wire. If no DTCs are present, the indicator remains blank.

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The climate control unit has a mode that displays sensor inputs it receives. This mode shows you what the climate control unit is receiving from each of the sensors, one at a time, and it can help you determine if a sensor is faulty.

Check these items before using the sensor input display mode

1. Turn the ignition switch ON (II), and check the recirculation door function; press the recirculation button to switch from FRESH to RECIRC. The air volume and sound should change slightly.
2. Set the temperature control knob to the desired test temperature. When selecting the test temperature, note these items: "Lo" temperature setting will default to MAX COOL, VENT, and RECIRC. "Hi" temperature setting will default to MAX HOT, FLOOR, and FRESH. 58 through 86 °F settings will use the automatic climate control logic.
3. Turn the ignition switch OFF.

To run the sensor input display mode, follow these steps

1. Turn the ignition switch OFF.
2. Press and hold both the AUTO and recirculation buttons, then start the engine.
3. After the engine starts, release the buttons. The display panel control unit will flash the sensor number and then the value for that sensor. Record the value displayed.
4. To advance to the next sensor, press the recirculation button. SENSOR DISPLAYED VALUE CHART Sensor Item Displayed Value 1 In-car Temperature °C 2 Outside Air Temperature °C 3 Solar Radiation Sensor Value: Dark = 00, Flashlight = 04, Cloudy =10, Sunny =65 10 kcal/m2-h 4 Engine Coolant Temperature °C 5 Evaporator Outlet Air Temperature °C 6 Driver's Air Mix Opening (Low value indicates cooler air distribution, higher value indicates warmer air distribution) % of opening 7 Passenger's Air Mix Opening (Low value indicates cooler air distribution, higher value indicates warmer air distribution) % of opening 8 Vehicle Speed (Vehicle must be driven to display speed) km/h 9 Driver's Vent Temperature Air Out (TAO-Dr) °C NOTE: The sensor values will be displayed in degrees Celsius (°C) or an alphanumeric code. Use the chart to convert the value to degrees Fahrenheit (°F). If the sensor value displays "Er" this indicates there is an open or short in the circuit or sensor. Check for DTCs using the HDS, or refer to checking DTCs by DTC indication to check for DTCs. If necessary, compare the sensor input display to an alike, known-good vehicle under the same test conditions. If the sensor is out of the normal range, refer to the sensor test or substitute a known-good sensor, and recheck.
5. To cancel the sensor input display mode, press the AUTO button or turn the ignition switch off.

CELSIUS TO FAHRENHEIT CONVERSION CHART (1 OF 2)

CELSIUS TO FAHRENHEIT CONVERSION CHART (2 OF 2)

ALPHANUMERIC CONVERSION CHART

Checking the DTCs by HDS

DIAGNOSTIC TROUBLESHOOTING CHART

A/C Pressure Switch

The A/C pressure switch consists of a high-low pressure switch (A/C pressure switch A) and a middle pressure switch (A/C pressure switch B).

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1. High-low pressure switch If the refrigerant pressure becomes too high (due to blockage or lack of airflow at the condenser), or too low (due to leakage), the A/C pressure switch stops the A/C request signal to the PCM and the A/C compressor stops operating.
2. Middle pressure switch If the refrigerant pressure goes above 1,520 kPa (15.5 kgf/cm 2 , 221 psi), the A/C pressure switch closes to signal the PCM to change the speed of the A/C condenser fan and radiator fan to high. When the refrigerant pressure drops below 930 kPa (9.5 kgf/cm 2 , 135 psi), the A/C pressure switch opens to signal the PCM to change the speed of the A/C condenser fan and radiator fan to low.

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This system automatically controls the temperature and the vent mode for the driver and passenger's sides depending on the angle of the sun and the direction of the vehicle. The system receives information such as date, time, longitude, and latitude from the navigation system, and it determines the irradiate strength of the sun from the sunlight sensor.

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In the event that the navigation system malfunctions, or when driving in areas where the navigation cannot determine the vehicle position (non-coverage areas, tunnels, etc.), the climate control system will operate the same as one in a vehicle without navigation.

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