Test B: The Steering Wheel Controls Illumination Is Inoperative

PINPOINT TEST B: THE STEERING WHEEL CONTROLS ILLUMINATION IS INOPERATIVE

Normal Operation
The smart junction box (SJB) sends a pulse width modulated (PWM) voltage to the steering wheel controls through circuit VLN04 (VT/GY) to the clockspring. The PWM signal passes through the clockspring to circuit VLN04 (VT/GY) to the LH and RH control switches. Ground to the LH and RH steering wheel switch is supplied through circuit GD165 (BK).

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Steering wheel control switch
- Clockspring

B1-B3:

B3-B4: