Explorer 4WD V6-4.0L (2009)
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Measure the resistance between the HVAC module C228a-2, circuit GD145 (BK/BU) and ground.
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Is the resistance less than 5 ohms?
Yes
GO to I3.
No
REPAIR the circuit. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
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I3 CHECK THE MS-CAN CIRCUITS BETWEEN THE HVAC MODULE AND THE DLC FOR AN OPEN
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Measure the resistance between the HVAC module C228a-11, circuit VDB06 (GY/OG), harness side and the DLC C251-3, circuit VDB06
(GY/OG), harness side.
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Measure the resistance between the HVAC module C228a-1, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07
(VT/OG), harness side.
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Are the resistances less than 5 ohms?
Yes
CONNECT the negative battery cable. GO to I4.
No
REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
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I4 CHECK FOR CORRECT HVAC MODULE OPERATION
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Disconnect all the HVAC module connectors.
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Check for:
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corrosion
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damaged pins
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pushed-out pins
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Connect all the HVAC module connectors and make sure they seat correctly.
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Operate the system and verify the concern is still present.
