F 150 2WD V8-5.4L Flex Fuel (2008)
C6-C8
Test D: The Demand Lighting Is Inoperative
PINPOINT TEST D: THE DEMAND LIGHTING IS INOPERATIVE
Normal Operation
The instrument cluster (IC) energizes the battery saver relay, located in the central junction box (CJB), through circuit 1005 (VT/OG). The battery
saver relay provides voltage to circuit 705 (LG/OG). Circuit 705 (LG/OG) provides voltage to each demand lamp switch, which when activated,
provides voltage to the selected demand lamp. The demand lamps are grounded through circuit 57 (BK). The battery saver deactivates when the IC
releases the ground from the relay on circuit 1005 (VT/OG), after time-out. The battery saver relay is integral to the CJB.
This pinpoint test is intended to diagnose the following:
-
Fuse
-
Wiring, terminals or connectors
-
CJB
-
IC
