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Test D: The Steering Wheel Control Illumination Is Inoperative
PINPOINT TEST D: THE STEERING WHEEL CONTROL ILLUMINATION IS INOPERATIVED1-D4:
D4-D5:
D6:
Normal Operation
The smart junction box (SJB) sends a pulse width modulated (PWM) voltage to the steering wheel controls through circuit VLN04 (VT/GY) (Edge) or circuit VLN37 (BU/WH) (MKX) to the clockspring. The voltage passes through the clockspring to the steering wheel control switches. Ground to the clockspring is supplied through circuit GD116 (BK/VT).
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Steering wheel control switch harness
- Steering wheel control switch(s)
- Clockspring