F 250 4WD Super Duty V8-6.4L DSL Turbo (2008)
PINPOINT TEST H: THE RUNNING BOARD LAMP(S) ARE INOPERATIVE (THE CARGO LAMP OPERATES)
Normal Operation
The smart junction box (SJB) provides voltage to the running board lamps through circuit CLN25 (VT). The running board lamps are grounded
through circuit GD176 (BK/WH).
This pinpoint test is intended to diagnose the following:
-
Wiring, terminals or connectors
-
Running board lamp
H1-H3
Test I: The Courtesy Lamps Are Inoperative From The Instrument Panel Dimmer Switch
PINPOINT TEST I: THE COURTESY LAMPS ARE INOPERATIVE FROM THE INSTRUMENT PANEL DIMMER SWITCH
Normal Operation
The smart junction box (SJB) monitors the instrument panel dimmer switch status on circuit CLN28 (GN/BU) to determine if the courtesy lamps are
requested. Based on the instrument panel dimmer switch status, the SJB supplies voltage to the courtesy lamps through circuit CLN03 (YE/GY).
This pinpoint test is intended to diagnose the following:
