F 250 4WD Super Duty V8-6.4L DSL Turbo (2008)
Courtesy Lamp: Pinpoint Tests
Test A: The Courtesy Lamps Are Inoperative
PINPOINT TEST A: THE COURTESY LAMPS ARE INOPERATIVE
Normal Operation
Power is supplied to the courtesy lamps through the smart junction box (SJB) fuse 9 (15A), which supplies voltage to the courtesy lamps/demand
lamps solid-state relay in the SJB. The inputs for courtesy lamp operation are ajar switches, dimmer switch and remote keyless entry (RKE). The SJB
monitors the inputs, and based on them, the SJB energizes the solid-state relay supplying voltage to the courtesy lamps on circuit CLN03 (YE/GY).
Ground for the courtesy lamps is supplied through circuit GD179 (BK/VT).
DTC B2A35 (Interior Lighting Output Circuit Open) - is an on-demand DTC that sets when the SJB detects an open from the interior lighting circuit.
DTC B2A36 (Interior Lighting Output Circuit Short To Ground) - is a continuous and on-demand DTC that sets when the SJB detects a short to
ground from the interior lighting circuit.
This pinpoint test is intended to diagnose the following:
-
Fuse
-
Wiring, terminals or connectors
-
SJB
A1-A2
