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Symptom
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Diagnostic procedure
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Also check for
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Blower, heater controls, and A/C do not work
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Voice communication does not work
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Both fans do not run at low speed with the A/C on (but the A/C compressor runs with the A/C on)
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The A/C condenser fan does not run at high speed (but both fans run at low speed and the A/C compressor operates with the A/C on)
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Both fans do not run at high speed with the A/C on (but both fans run at low speed and the A/C compressor operates with the A/C on)
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A/C pressure sensor troubleshooting: A/C pressure sensor circuit low voltage,
A/C pressure sensor circuit high voltage
ECT troubleshooting:
ECT sensor 2 circuit low voltage,
ECT sensor 2 circuit high voltage
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The A/C compressor clutch does not engage (but both fans run with the A/C on)
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A/C system does not come on (both fans and the A/C compressor do not work); heater is OK
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PTC heater does not work
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Blower fan runs slower than expected in cold weather
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ECT troubleshooting:
ECT sensor 2 circuit low voltage,
ECT sensor 2 circuit high voltage
NOTE: It is normal for the blower to run slowly until the engine coolant temperature begins to rise. If the blower continues to run slowly for an abnormal length of time, continue to troubleshoot the problem.
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Passenger's temperature control switch does not work
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Cleanliness and tightness of all terminals
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HDS does not communicate with the climate control unit or the vehicle
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