F 150 4WD V8-5.4L Flex Fuel (2008)
D3-D4
Test E: The Vehicle Security Module (VSM) Does Not Respond To The Scan Tool
PINPOINT TEST E: THE VEHICLE SECURITY MODULE (VSM) DOES NOT RESPOND TO THE SCAN TOOL
Normal Operation
The VSM communicates with the scan tool through the UBP communication network. Circuit 1906 (VT) provides the network connection to the
VSM. The VSM shares the UBP network with the heating ventilation air conditioning (HVAC) module (if equipped), the driver seat module (DSM)
(if equipped) and the instrument cluster (IC). Voltage for the VSM is provided by circuits 7 (LG/YE) and 294 (WH/LB). Circuits 57 (BK) and 938
(BK/LG) provide ground.
This pinpoint is intended to diagnose the following:
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Fuses
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Wiring, terminals or connectors
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VSM
