Test E: The Control Illumination Does Not Dim

PINPOINT TEST E: THE CONTROL ILLUMINATION DOES NOT DIM

E1-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).

DTC B1247 - sets when the panel dim switch is determined to be above the allowed maximum input voltage.

Possible Causes
- Circuit VLN18 (BU/WH) open, short to voltage or ground
- Circuit CLN27 (WH/BN) open, short to voltage or ground
- Circuit VLN04 (VT/GY) short to voltage
- Instrument panel dimmer switch (part of the headlamp switch assembly)
- SJB