F 550 4WD Super Duty V10-6.8L (2009)
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Measure the resistance between the DSM C341A-2, circuit GD179 (BK/VT), harness side and ground.
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Is the resistance less than 5 ohms?
Yes
CONNECT the negative battery cable. GO to H6.
No
REPAIR the circuit for high resistance. CONNECT the negative battery cable. TEST the system for normal operation.
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H6 CHECK FOR CORRECT DSM OPERATION
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Disconnect all the DSM 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 DSM connectors and make sure they seat correctly.
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Operate the system and verify the concern is still present.
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Is the concern still present?
Yes
INSTALL a new DSM. REFER to Driver Seat Module (DSM) See: Mirrors/Memory Positioning Systems/Memory Positioning Module/Service and
Repair. TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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Pinpoint Test I: DTC U0140
Driver Seat Module (DSM)
Pinpoint Tests
Pinpoint Test I: DTC U0140
Normal Operation
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DTC U0140 (Lost Communication With Body Control Module (GEM)) - set by the DSM whenever it receives invalid data from the Smart
Junction Box (SJB).
This pinpoint test is intended to diagnose the following:
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Module communication
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DSM
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SJB
PINPOINT TEST I: DTC U0140
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I1 VERIFY CUSTOMER CONCERN
