Flex AWD V6-3.5L (2009)
Normal Operation
The 4X4 control module communicates with the scan tool through the High Speed Controller Area Network (HS-CAN). Circuits VDB04 (WH/BU)
(HS-CAN +) and VDB05 (WH) (HS-CAN -) provide the network connection to the 4X4 control module. Voltage is supplied by circuits CBP35
(YE/GY) and SBP11 (BU/RD). Ground is supplied by circuit GD145 (BK/BU).
This pinpoint test is intended to diagnose the following:
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Fuse
-
Wiring, terminals or connectors
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4X4 control module
PINPOINT TEST F: THE 4X4 CONTROL MODULE DOES NOT RESPOND TO THE SCAN TOOL
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the
connector.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.
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F1 CHECK THE 4X4 CONTROL MODULE VOLTAGE SUPPLY CIRCUIT FOR AN OPEN
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Ignition OFF.
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Disconnect: 4X4 Control Module C281.
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Ignition ON.
-
Measure the voltage between the 4X4 control module C281-4, circuit CBP35 (YE/GY), harness side and ground, and between the 4X4 control
module C281-5, circuit SBP11 (BU/RD), harness side and ground.
-
Are the voltages greater than 10 volts?
Yes
GO to F2.
No
VERIFY the Smart Junction Box (SJB) fuses 35 (10A) and 11 (10A) are OK. If OK, REPAIR the circuit in question. If not OK, REFER to the Wiring
Diagrams to identify the possible causes of the circuit short. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with
the scan tool.
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F2 CHECK THE 4X4 CONTROL MODULE GROUND CIRCUIT FOR AN OPEN
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Ignition OFF.
-
Disconnect: Negative Battery Cable.
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Measure the resistance between the 4X4 control module C281-15, circuit GD145 (BK/BU), harness side and ground.
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Is the resistance less than 5 ohms?
