Ford 2003 Mustang Workshop Manual page 3514

next step. For additional information, refer to
4. Verify the parking brake control is fully released.
5. If an obvious cause for an observed or reported concern is found, correct the cause (if possible)
before proceeding to the next step.
6. If the concern is not visually evident, verify the symptom and refer to the Symptom Chart.
Symptom Chart
Symptom Chart
Condition
The daytime running lamps are
inoperative
The daytime running lamps are
on with the parking brake set
The daytime running lamps are
on with the ignition switch off
The low beam headlamps are on
at full intensity in DRL mode
The low beam headlamps are on
at reduced intensity with the
headlamp switch on
Pinpoint Tests
PINPOINT TEST A: THE DAYTIME RUNNING LAMPS ARE
INOPERATIVE
A1 CHECK THE PARKING BRAKE SWITCH SIGNAL
CIRCUIT TO THE DRL MODULE FOR SHORT TO GROUND
NOTE: Verify the parking brake control is fully released
for this step.
Key in OFF position.
Disconnect: DRL Module C1030.
Measure the resistance between DRL module C1030 Pin
6, Circuit 22 (LB/BK), harness side and ground.
Possible Sources
BJB Maxi-Fuse
FOG+DRL (20A).
Circuitry.
Parking brake
signal switch and
bracket.
DRL module.
Circuitry.
Parking brake
signal switch and
bracket.
DRL module.
Circuitry.
Ignition switch.
DRL module.
Circuitry.
Headlamp switch.
DRL module.
Circuitry.
Headlamp switch.
Test Step
Section 417-01 .
Result / Action to Take
Yes
GO to A3
No
GO to A2
Action
GO to
Pinpoint Test
A .
GO to
Pinpoint Test
B .
GO to
Pinpoint Test
C .
GO to
Pinpoint Test
D .
REFER to
Section 417-
01 .
.
.