Visual Inspection and Diagnostic Pre-checks
PINPOINT TEST F : ONE OR BOTH HIGH BEAMS ARE ON CONTINUOUSLY
F1 CHECK HIGH BEAMS OPERATION
Ignition ON. Place the headlamp switch in the HEADLAMPS position. Place the LH steering column multifunction switch in the LOW BEAM position and observe the headlamps. Observe the operation of the LH and RH headlamps.
Are both high beams illuminated?
Yes | GO to F2 |
|---|---|
No | GO to F3 |
F2 CHECK THE LH (LEFT-HAND) MULTIFUNCTION SWITCH INPUT
Using a diagnostic scan tool, view SCCM Parameter Identifications (PIDs). Monitor the SCCM High Beam Switch (HIGH_BEAM_SW) PID while placing the LH steering column multifunction switch in the HIGH BEAM and LOW BEAM positions.
Do the PID values agree with the LH steering column multifunction switch position?
Yes | GO to F6 |
|---|---|
No | INSTALL a new LH steering column multifunction switch. REFER to: Steering Column Multifunction Switch LH (211-05 Steering Wheel and Column Electrical Components, Removal and Installation). TEST the system for normal operation. If the concern still exists, GO to F5 |
F3 CHECK HIGH BEAM VOLTAGE SUPPLY CIRCUITS FOR VOLTAGE
Ignition OFF. Place the headlamp switch in the OFF position. Disconnect: LH Headlamp C1021 or RH Headlamp C1041. Ignition ON. Measure:
Click to display connectors
LH Headlamp
Positive Lead | Measurement / Action | Negative Lead |
|---|---|---|
C1021-10 | Ground |
Click to display connectors
RH Headlamp
Positive Lead | Measurement / Action | Negative Lead |
|---|
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.