Test E: The Control Illumination Is Always On

PINPOINT TEST E: THE CONTROL ILLUMINATION IS ALWAYS ON

E1:

E2-E3:

Normal Operation
The smart junction box (SJB) supplies a pulse-width modulated (PWM) voltage signal to the dimmable illumination sources on circuit CLN04 (BU/BN).

DTC B2026 - sets when the SJB detects a short to voltage on the incandescent backlighting output circuit.

DTC B2027 - sets when the SJB detects a short to voltage on the LED backlighting output circuit.

DTC B2121 - sets when the SJB detects a short to voltage on the instrument illumination switch circuit.

Possible Causes
- Circuit CLN04 (BU/BN) short to voltage
- SJB