F 450 2WD Super Duty V8-6.0L DSL Turbo VIN P (2006)
C20-C23
Normal Operation
On vehicles not equipped with remote keyless entry (RKE), the door ajar switch status is monitored by the instrument cluster. On vehicles equipped
with RKE, the vehicle security module monitors the door ajar status. Based on the door ajar status, the instrument cluster then energizes the battery
saver relay and the interior lamp relay. When the relays are energized, voltage is supplied to the interior lamp circuits.
Possible Causes
-
Circuit 53 (BK/LB) short to voltage
-
Circuit 402 (OG/LG) short to ground
-
Circuit 759 (LG/YE) short to ground
-
Circuit 760 (PK/LB) short to ground
-
Circuit 761 (GY/RD) short to ground
-
Circuit 765 (YE/BK) short to ground
-
Door ajar switch
-
Headlamp switch
-
Instrument cluster
-
Vehicle security module
Test D: The Demand Lighting Is Inoperative
PINPOINT TEST D: THE DEMAND LIGHTING IS INOPERATIVE
