Normal Operation
Based on input received from the instrument panel dimmer switch, the Smart Junction Box (SJB) sends a pulse-width modulated voltage to the hardwired dimmable illumination sources through circuit VLN04 (VT/GY) (Navigator only) and/or circuit VLN18 (BU/WH) (Expedition) (Navigator auxiliary climate control assembly).
DTC DESCRIPTION
| DTC Description | Fault Trigger Conditions |
|---|---|
|
An on-demand DTC that sets when the SJB detects an open from the backlighting output circuit. |
|
A continuous and on-demand DTC that sets when the SJB detects a short to ground from the backlighting output circuit. This DTC also sets when fuse 10 (15A) has failed or is removed. |
|
An on-demand DTC that sets when the SJB detects an open from the white lighting (backlighting) output circuit. |
|
A continuous and on-demand DTC that sets when the SJB detects a short to ground from the white lighting (backlighting) output circuit. This DTC also sets when fuse 10 (15A) has failed or is removed. |
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Auxiliary climate control assembly (Navigator only)
- SJB