Test E: The Control Illumination Does Not Dim
PINPOINT TEST E: THE CONTROL ILLUMINATION DOES NOT DIME1-E3:
E3-E6:
Normal Operation
With the parking lamps or headlamps ON, the smart junction box (SJB) sends a voltage reference signal through circuit VLN18 (BU/WH) to the instrument panel dimmer switch. The return signal is sent through circuit CLN27 (WH/BN) back to the SJB. The SJB then supplies a pulse width modulated (PWM) voltage signal to the dimmable illumination sources on circuit VLN04 (VT/GY).
Possible Causes
- circuit CLN27 (WH/BN) open, short to voltage, or short to ground
- circuit VLN04 (VT/GY) short to voltage
- instrument panel dimmer switch
- SJB