Instrument Panel and Interior Switches Illumination — 2016 workshop reference 3856

Press the illumination dim up switch to the full illumination position. Measure:

Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C218A-1		C218A-4

Is the voltage greater than 11 volts?

Yes	GO to G4
No	GO to G3

G3 CHECK FOR ILLUMINATION VOLTAGE AT THE CLOCKSPRING

Measure:

Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C218A-1		Ground

Is the voltage greater than 11 volts?

Yes	REPAIR the illumination ground circuit.
No	REPAIR the circuit in question.

G4 CHECK FOR ILLUMINATION VOLTAGE AND GROUND TO THE STEERING WHEEL SWITCHES

Place the headlamp switch in the OFF position. Ignition OFF. Remove the driver airbag. REFER to: Driver Airbag (501-20B Supplemental Restraint System, Removal and Installation). Connect C218A. Disconnect C218B. Place the headlamp switch in the PARKING LAMPS ON position. Ignition ON. Measure:

Click to display connectors

Positive Lead	Measurement / Action	Negative Lead
C218B-11 Component side		C218B-1 Component side

Is the voltage greater than 11 volts?

Yes INSTALL a new steering wheel. REFER to: Steering Wheel (211-04 Steering Column, Removal and Installation). No INSTALL a new clockspring. REFER to: Clockspring (501-20B Supplemental Restraint System, Removal and

Original table alignment retained · Scroll horizontally if needed

Source reference 3856

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.