Explorer Sport Trac 2WD V6-4.0L (2009)
Refer to Wiring Diagram Set 46, Supplemental Restraint System for schematic and connector information. See: Diagrams/Electrical Diagrams/Diagrams
By Number
Normal Operation
The Occupant Classification System Module (OCSM) 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 OCSM. Voltage to the OCSM is
supplied by circuit CBP17 (BN/GN). Ground is supplied by circuit GD145 (BK/BU).
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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OCSM
PINPOINT TEST F: THE OCSM 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.
NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint
test. See: Initial Inspection and Diagnostic Overview/Communications Network/Inspection And Verification
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F1 CHECK THE OCSM VOLTAGE SUPPLY CIRCUIT FOR AN OPEN
WARNING: Never probe the electrical connectors on safety belt buckle/retractor pretensioners or adaptive load limiting retractors. Failure to
follow this instruction may result in the accidental deployment of the safety belt pretensioners or adaptive load limiting retractors, which
increases the risk of serious personal injury or death.
NOTE: The Supplemental Restraint System (SRS) must be fully operational and free of faults before releasing the vehicle to the customer.
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Ignition OFF.
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Depower the SRS. Refer to Air Bag Systems.
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Disconnect: OCSM C3159.
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Deactivate the SRS. Refer to Air Bag Systems.
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Repower the SRS. Refer to Air Bag Systems.
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Ignition ON.
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Measure the voltage between the OCSM C3159-1, circuit CBP17 (BN/GN), harness side and ground.
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Is the voltage greater than 10 volts?
Yes
GO to F2.
No
VERIFY the Smart Junction Box (SJB) fuse 17 (10A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the Wiring Diagrams to identify the
possible causes of the circuit short.
REACTIVATE the SRS. REFER to Air Bag Systems. CLEAR the DTCs. REPEAT the network test with the scan tool.
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F2 CHECK THE OCSM GROUND CIRCUIT FOR AN OPEN