Ford 2003 Mustang Workshop Manual page 3518

PINPOINT TEST D: THE LOW BEAM HEADLAMPS ARE ON AT FULL
INTENSITY IN DRL MODE
Test Step
D1 CHECK THE LOW BEAM
HEADLAMPS INPUT
Disconnect: DRL Module
C1030.
Are the low beam
headlamps still on at full
intensity?
Result / Action to Take
Yes
REFER to Section 417-01
No
INSTALL a new DRL module. REFER to
Daytime Running Lamps (DRL)
normal operation.
.
Module—
. TEST the system for