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Daytime Running Lamp (DRL) System
The daytime running lamp system is designed to turn the high beam headlamps on, with a reduced light output, and without illuminating the high beam indicator lamp in the instrument panel (04320) when the following conditions exist:
The ignition switch lock cylinder (11582) is in the RUN position.
The parking brake is fully released.
The headlamp switch (11654) is in the OFF or PARK position.
and for posterity:
Before performing any lighting systems test, check that the battery is fully charged, that battery connections are clean and tight, and that burned out fuses and bulbs have been replaced. The low beam headlamps should operate correctly. If not, refer to Section 17-01. The daytime running lamp module is grounded through the low beam circuit while operating the high beam
Pin Number Circuit Circuit Function
1 12A581 Wiring Assembly
2 — Locator (Part of 12A581)
3 15A272 Daytime Running Lamps Control
4 N610957 Screw
5 — To Ambient Temperature Sensor (Part of 12A581)
6 — Ambient Temperature Sensor
(Part of 12A581)
7 15422 Front End Air Seal
8 14666 Ambient Temperature Sensor Delete Cap
9 14A624 Cap
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Removal
Remove screw retaining daytime running lamps control (15A272) to radiator support (16138).
Disconnect data link connector (14489).
Remove daytime running lamps control.
Installation
Follow removal procedures in reverse order.
Tighten retaining screw to 2.6-3.2 Nm (23-29 lb-in).
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Inspection and Verification
Verify the vehicle owner's original concern by operating the daytime running lamps to duplicate the vehicle owner's concern.
Inspect to determine if one of the following mechanical or electrical concerns apply:
VISUAL INSPECTION CHART
Mechanical
Damaged headlamps
Damaged connectors
Damaged ignition switch
Damaged daytime running lamp control module
Damaged parking brake switch
Damaged headlamp switch
Damaged multi-function switch
Electrical
Open instrument panel fuse (10A)
Open power distribution box fuses (15A, 30A)
Circuitry open/shorted
the concern(s) remains after the inspection, determine the symptom(s) and proceed to the following symptom chart.
DAYTIME RUNNING LAMPS Condition Possible Source Action
Daytime Running Lamps Inoperative
Daytime running lamps control module not installed.
Open or shorted circuitry.
Damaged daytime running lamps control module.
GO to Pinpoint Test A.
High Beam Indicator Inoperative
Damaged miniature bulb.
Open or shorted circuitry.
GO to Pinpoint Test
PINPOINT TEST A: DRL MALFUNCTION OR DRL INOPERATIVE
A1 CHECK HIGH BEAM OPERATION
Key in RUN.
Parking brake fully released.
Headlamp switch OFF or in the PARK position.
Are the high beams off?
Yes GO to A3.
No GO to A2.
A2 CHECK HIGH BEAM INTENSITY
Key in RUN.
Parking brake fully released.
Headlamp switch OFF or in the PARK position.
Are the high beams on at reduced intensity?
Yes System is functioning properly. No service required
No REPLACE daytime running lamps control module. RESTORE vehicle. RETEST system
A3 CHECK DAYTIME RUNNING LAMPS CONTROL MODULE INSTALLATION
Key OFF.
Headlamp switch OFF.
Check installation of daytime running lamps control module and harness connector.
Is daytime running lamps control module installed and is connector fully seated?
Yes GO to A4.
No REINSTALL daytime running lamps control module. RESTORE vehicle. RETEST system
A4 CHECK DAYTIME RUNNING LAMPS CONTROL MODULE POWER
Key OFF.
Remove daytime running lamps control module.
Check IP fuse panel fuse 17 (10A) and power distribution box fuses 3 (30A) and 5 (15A) for an open.
Replace fuse(s) if opened.
Key in RUN.
Parking brake fully released.
Headlamp switch OFF or in the PARK position.
Multi-function switch in LO beam position.
Is battery voltage present at Pins 3 and 7 of daytime running lamps control module and at Pin 13 of instrument cluster connectors?
Yes GO to A5.
No SERVICE Circuit 298 (P/O), Circuit 38 (BK/O), or Circuit 640 (R/Y) for open circuit. RESTORE vehicle. RETEST system.
A5 CHECK DAYTIME RUNNING LAMPS CONTROL MODULE PIN 8
With daytime running lamps control module removed, actuate key to RUN.
Headlamp switch in the HEAD position.
Multi-function switch in the HI beam position.
Check for battery voltage at Pin 8 of the daytime running lamps control module connector.
Is battery voltage present?
Yes GO to A6.
No SERVICE open in Circuit 12 (LG/BK) between headlamps and daytime running lamps control module connector. RESTORE vehicle. RETEST system
A6 CHECK MODULE GROUND
With daytime running lamps control module removed, actuate key to RUN.
Headlamp switch in the HEAD position.
Multi-function switch in the HI beam position.
Check resistance between Pin 6 of the daytime running lamps control module connector and a known good ground.
Is resistance 1.5 ohms or less?
Yes GO to A7.
No SERVICE open in Circuit 13 (R/BK) between headlamps and daytime running lamps control module connector. RESTORE vehicle. RETEST system.
A7 CHECK DAYTIME RUNNING LAMPS CONTROL MODULE PIN 6
With daytime running lamps control module removed, actuate key to RUN.
Headlamp switch in the HEAD position.
Multi-function switch in the LO beam position.
Check for battery voltage at Pin 6 of the daytime running lamps control module connector.
Is battery voltage present?
Yes GO to A8.
No SERVICE open in Circuit 13 (R/BK) between headlamps and daytime running lamps control module connector. RESTORE vehicle. RETEST system.
A8 CHECK HIGH BEAM INDICATOR
With daytime running lamps control module removed, actuate key to RUN.
Headlamp switch in the HEAD position.
Multi-function switch in the HI beam position.
Jumper Pin 8 to Pin 1 of the daytime running lamps control module connector.
Did high beam indicator illuminate?
YesGO to A9.
No REPLACE illumination bulb or SERVICE Circuits 932 (GY/W) or 57 (BK) for an open. RESTORE vehicle. RETEST system.
A9 CHECK PARKING BRAKE SWITCH
With daytime running lamps control module removed, actuate all accessories to the OFF position.
Check continuity of the parking brake switch between Pin 4 of the daytime running lamps control module connector and a known good ground.
Apply and release parking brake.
Is resistance less than 1.5 ohms with parking brake applied and is resistance infinite with the parking brake released?
Yes GO to A10.
No SERVICE ground connection at parking brake switch, or SERVICE Circuit 162 (LG/R) for an open or a short, or REPLACE parking brake switch. RESTORE vehicle. RETEST system.
A10 RECHECK DAYTIME RUNNING LAMPS CONTROL MODULE
Reinstall daytime running lamps control module.
Key in RUN.
Parking brake fully released.
Headlamp switch OFF or in the PARK position.
Multi-function switch in the LO beam position.
Are the high beams on at reduced intensity?
Yes System is functioning properly. No service required.
No REPLACE daytime running lamps control module. RESTORE vehicle. RETEST system.
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Daytime Running Lamps, F-Series and Bronco
all from 1996 F-150, F-250, F-350, F-Super Duty, Chassis Cab and Motorhome Chassis, and Bronco
(Canadian Vehicles Only) Workshop Manual
