Section 17-02: Lighting, Interior
1996 F-150, F-250, F-350, F-Super Duty Chassis Cab and Bronco Vehicles Workshop Manual
DIAGNOSIS AND TESTING

Pinpoint Tests Courtesy Lamps

 

PINPOINT TEST A: COURTESY LAMPS INOPERATIVE

 

A1 CHECK INTERIOR LAMPS FUSE 8 (15A) FOR VOLTAGE

Is voltage present?
YesNo
SERVICE open in Circuit 54 (LG/Y) RESTORE vehicle. RETEST system.GO to A2.
 

A2 CHECK CIRCUIT 54 (LG/Y) FOR SHORT

Is resistance 5 ohms or less?
YesNo
SERVICE Circuit 54 (LG/Y) for short to ground. RESTORE vehicle. REPLACE IP fuse 8 (15A). RETEST system.REPLACE IP fuse 8 (15A). RETEST system.
 

PINPOINT TEST B: COURTESY LAMPS ON CONTINUOUSLY

 

B1 CHECK HEADLAMP SWITCH

Do courtesy lamps go out?
YesNo
REPLACE headlamp switch. RESTORE vehicle. RETEST system.GO to B2.
 

B2 CHECK COURTESY LAMP SWITCHES

Do courtesy lamps go out when any courtesy lamp switch is disconnected?
YesNo
REPLACE shorted courtesy lamp switch. RESTORE vehicle. RETEST system.SERVICE battery short in Circuit 53 (BK/LB) or Circuit 55 (BK/PK). RESTORE vehicle. RETEST system.
 

PINPOINT TEST C: DOME LAMP INOPERATIVE

 

C1 HEADLAMP SWITCH CHECK DOME LIGHT ON

Is voltage present at Pin D2?
YesNo
GO to C2.REPLACE headlamp switch. RESTORE vehicle. RETEST system.
 

C2 CHECK CIRCUIT 53 (BK/LB)

Is voltage present?
YesNo
GO to C3.REPAIR open in Circuit 53 (BK/LB). RESTORE vehicle. RETEST system.
 

C3 CHECK DOME LAMP GROUND

Is there resistance?
YesNo
REPLACE dome lamp.REPLACE dome lamp fixture. RESTORE vehicle. RETEST system.
 

PINPOINT TEST D: ONE OR MORE MAP LAMPS INOPERATIVE

 

D1 CHECK POWER TO MAP LAMPS

Is battery voltage present?
YesNo
GO to D2.SERVICE Circuit 54 (LG/Y) or Circuit 705 (LG/O) for open or ground short. RESTORE vehicle. RETEST system.
 

D2 CHECK MAP LAMP SWITCHES

Is voltage present?
YesNo
GO to D3.REPLACE damaged switch. RESTORE vehicle. RETEST system.
 

D3 CHECK MAP LAMP GROUND

Is continuity present?
YesNo
REPLACE miniature bulb. RESTORE vehicle. RETEST system.SERVICE map lamp ground. RESTORE vehicle. RETEST system.
 

PINPOINT TEST E: ENGINE COMPARTMENT LAMP INOPERATIVE

 

E1 CHECK ENGINE COMPARTMENT LAMP SUPPLY

Is voltage present?
YesNo
GO to E2.SERVICE Circuit 54 (LG/Y) or Circuit 705 (LG/O) for open or ground short. RESTORE vehicle. RETEST system.
 

E2 CHECK ENGINE COMPARTMENT LAMP GROUND

Is continuity present?
YesNo
GO to E3.SERVICE Circuit 57 (BK) for open circuit. RESTORE vehicle. RETEST system.
 

E3 CHECK ENGINE COMPARTMENT LAMP BULB

Does bulb test OK?
YesNo
REPLACE compartment lamp. RESTORE vehicle. RETEST system.REPLACE engine compartment lamp miniature bulb. RESTORE vehicle. RETEST system.
 

PINPOINT TEST F: GLOVE COMPARTMENT LAMP INOPERATIVE

 

F1 CHECK GLOVE COMPARTMENT LAMP POWER SUPPLY

Is voltage present?
YesNo
GO to F2.SERVICE Circuit 54 (LG/Y) or Circuit 705 (LG/O) for open or ground short. RESTORE vehicle. RETEST system.
 

F2 SWITCH CHECK

Is voltage present?
YesNo
GO to F3.REPLACE the glove compartment lamp fixture. RESTORE vehicle. RETEST system.
 

F3 GROUND SIDE TEST

Is continuity present?
YesNo
REPLACE miniature bulb. RESTORE vehicle. RETEST system.SERVICE glove compartment lamp fixture ground. RESTORE vehicle. RETEST system.
 

PINPOINT TEST G: GLOVE COMPARTMENT LAMP ON CONTINUOUSLY

 

G1 GLOVE COMPARTMENT SWITCH CHECK

Is voltage present?
YesNo
REPLACE the glove compartment lamp fixture. RESTORE vehicle. RETEST system.System OK.
 

PINPOINT TEST H: VANITY MIRROR LAMPS INOPERATIVE

 

H1 CHECK VANITY MIRROR LAMPS SUPPLY

Is voltage present?
YesNo
GO to H2.SERVICE Circuit 54 (LG/Y) or Circuit 705 (LG/O) for open or ground short. RESTORE vehicle. RETEST system.
 

H2 CHECK VANITY MIRROR LAMPS GROUND

Is continuity present?
YesNo
GO to H3.SERVICE open ground circuit. RESTORE vehicle. RETEST system.
 

H3 CHECK VANITY MIRROR LAMP BULB

Is continuity present?
YesNo
REPLACE vanity mirror assembly. RESTORE vehicle. RETEST system.REPLACE vanity mirror lamp bulb. RESTORE vehicle. RETEST system.
 

PINPOINT TEST J: VANITY MIRROR LAMPS ON CONTINUOUSLY

 

J1 VANITY MIRROR LAMPS ON CONTINUOUSLY

Is continuity present?
YesNo
SERVICE the vanity mirror switch. RESTORE vehicle. RETEST system.System OK.