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Heres some pictures and locations for you:
Unable to enter self-test
DTC C1445: Vehicle Speed Signal Circuit Failure
Disconnect the battery ground cable. For additional information, refer to Section 414-01 .
NOTE: The air suspension control module is mounted to the lower left side of the dash above the parking brake control.
Refer to Wiring Diagrams Cell 149 , relay component for schematic and connector information.