Some people like them, some people hate them.
Thanks to Glen Murdock
To temporarily deactivate DRL’s, simply remove the fuse from the under hood fuse box (See Fig. 1).
WARNING:
DAYTIME RUNNING LAMPS CONTROL GETS VERY HOT DURING OPERATION. BE SURE DAYTIME RUNNING LAMPS CONTROL HAS COOLED BEFORE HANDLING IT OR PERSONAL INJURY MAY OCCUR.
To permanently remove them from your car you must first obtain a jumper plug, which replaces the DRL module. If you unplug the DRL module and don’t replace the jumper you’ll have no headlights. The jumper plug can be found in a junkyard on any Ford made after 1990 W/O DRL’s. I don’t know if it can be bought from a Ford dealer. The connector is located in the left front wheel well, in front of the tire (See Fig. 2). On a Gen 3 SHO, it is in front of the saxicone and above the air inlet.
The part # for the module is F43Z-15A272-A. It cost approx. $40.00. To add DRL’s to your car, remove the left front wheel and the front inner fender liner. The harness is clipped to brace near the saxicone inlet (See Fig 2). Pry it loose, remove the jumper and store it in a safe place, attach the DRL module to the brace with one or two screws. The replacement DRL module does not have the bracket shown in the picture and it is not available as far as I know. Plug the module in and check to see that a fuse is in the under-hood fuse box (See Fig. 1).
Figure 1
Figure 2
DRL problem diagnosis from the Helms manual:
PINPOINT TEST A: HIGH BEAM INDICATOR ON, HIGH BEAMS ON FULL INTENSITY OR HIGH BEAMS INOPERATIVE
A1 CHECK HIGH BEAM CIRCUIT 932 (GY/W)
Yes
REPLACE daytime running lamps control. RESTORE vehicle. RETEST system.
No
GO to A2.
A2 CHECK LOW BEAM CIRCUIT 161 (DG/O)
Yes
REPLACE daytime running lamps control. RESTORE vehicle. RETEST system.
No
GO to A3.
A3 CHECK HIGH BEAM INPUT CIRCUIT 164 (P/LB)
Yes
REPLACE daytime running lamps control. RESTORE vehicle. RETEST system.
No
System OK.
PINPOINT TEST B: HIGH BEAMS ON AT REDUCED INTENSITY WITH IGNITION OFF
B1 CHECK IGNITION SWITCH INPUT
Yes
GO to B2.
No
REPLACE daytime running lamps control. RESTORE vehicle. RETEST system.
PINPOINT TEST B: HIGH BEAMS ON AT REDUCED INTENSITY WITH IGNITION OFF
B2 CHECK CIRCUIT 1087 (O)
Yes
SERVICE Circuit 1087 (O) for short to B+. RESTORE vehicle. RETEST system.
No
REFER to «Section 11-05», Component Tests, for Ignition Switch Test procedure.
PINPOINT TEST C: HIGH BEAMS ON AT REDUCED INTENSITY WITH PARKING BRAKE APPLIED
C1 CHECK PARKING BRAKE SWITCH
Yes
GO to C2.
No
REPLACE daytime running lamps control. RESTORE vehicle. RETEST system.
C2 CHECK PARK BRAKE SWITCH WITH DRL MODULE CONNECTED
Yes
GO to C3.
No
REPLACE parking brake signal switch and bracket. RESTORE vehicle. RETEST system.
C3 CHECK PARK BRAKE SWITCH WITH DRL MODULE DISCONNECTED
Yes
Circuit 511 (LG) is OK.
No
SERVICE Circuit 511 (LG) for open. RESTORE vehicle. RETEST system.
PINPOINT TEST D: NO HIGH BEAM INDICATOR WITH HEADLAMPS IN HIGH BEAM POSITION
D1 CHECK DRL CONTROL
Yes
REPLACE daytime running lamps control. RESTORE vehicle. RETEST system.
No
GO to «Section 13-01» for instrument cluster diagnosis and testing.
Connector C186