Flex FWD V6-3.5L (2010)
Pinpoint Test Q: The Liftgate/Trunk Module (LTM) Does Not Respond To The Scan Tool
Refer to Wiring Diagram Set 14, Module Communications Network for schematic and connector information. See: Diagrams/Electrical
Diagrams/Diagrams By Number
Refer to Wiring Diagram Set 109, Power Liftgate for schematic and connector information. See: Diagrams/Electrical Diagrams/Diagrams By Number
Normal Operation
The Liftgate/Trunk Module (LTM) communicates with the scan tool through the Medium Speed Controller Area Network (MS-CAN).
This pinpoint test is intended to diagnose the following:
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Fuse
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Wiring, terminals or connectors
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LTM
PINPOINT TEST Q: THE LTM 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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Q1 CHECK THE LTM VOLTAGE SUPPLY CIRCUIT FOR AN OPEN
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Ignition OFF.
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Disconnect: LTM C4174b.
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Ignition ON.
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Measure the voltage between the LTM C4174b-4, circuit SBB34 (YE/RD), harness side and ground; and between the LTM C4174b-9, circuit
SBP14 (BN/RD), harness side and ground.
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Are the voltages greater than 10 volts?
Yes
GO to Q2.
No
VERIFY the Battery Junction Box (BJB) fuse 34 (30A) and the Smart Junction Box (SJB) fuse 14 (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. CLEAR the DTCs. REPEAT the network test with the scan
tool. See: Diagrams/Electrical Diagrams/Diagrams By Number
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Q2 CHECK THE LTM GROUND CIRCUIT FOR AN OPEN
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Ignition OFF.
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Disconnect: Negative Battery Cable.
