Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSHONDA2009S2000 BASEREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSHEATING SYSTEMAIR MIX CONTROL MOTOR TEST

2009 Honda S2000 Base

Air Mix Control Motor Test

2009 Honda S2000 BaseSECTION Air Mix Control Motor Test

Disconnect the 7P connector from the air mix control motor.
NOTE: Incorrectly applying power and ground to the air mix control motor will damage it. Follow the instructions carefully.
Connect battery power to the No. 1 terminal of the air mix control motor, and ground the No. 2 terminal; the air mix control motor should run, and stop at Max Hot. If it doesn't, reverse the connections; the air mix control motor should run, and stop at Max Cool.
If the air mix control motor does not run in step 2, remove it, then check the air mix control linkage and doors for smooth movement.
- If the linkage and doors move smoothly, replace the air mix control motor.
- If the linkage or doors stick or bind, repair them as needed.
- If the air mix control motor runs smoothly, go to step 4.
Fig 1: Air Mix Control Motor Pattern
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Measure the resistance between the No. 5 and No. 7 terminals. It should be between 4.2 to 7.8 kΩ.
Reconnect the air mix control motor 7P connector, then turn the ignition switch to ON (II).
Using the backprobe set, measure the voltage between the No. 3 and No. 7 terminals.
Max Cool: about 1 V

Max Hot: about 4 V
If either the resistance or voltage reading are not as specified, replace the air mix control motor.

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.