Test D: One Or More Smart Junction Box (SJB) Controlled Illumination Source(s) Is Inoperative

PINPOINT TEST D: ONE OR MORE SMART JUNCTION BOX (SJB) CONTROLLED ILLUMINATION SOURCE(S) IS INOPERATIVE

Normal Operation - Dimmable Backlighting
With the parking lamps on, a voltage signal is supplied to the instrument panel dimmer switch through circuit 1036 (BN/WH) from the SJB. The dimmer switch passes this voltage through a variable resistor and then returns the signal to the SJB on circuit 1035 (OG/RD). The SJB uses the return signal to determine the backlighting intensity desired by the operator. A pulse-width modulated (PWM) signal is sent from the SJB to each of the dimmable backlights maintaining the operator's desired level of lighting intensity.

Normal Operation - Non-Dimmable Backlighting
When the ignition switch is placed in the ACCY or the ON position, a voltage signal is supplied to the SJB. The SJB activates the accessory delay relay, supplying voltage to the non-dimmable backlights.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Illuminated component
- Clockspring
- Speed control switch
- SJB

D1-D3:

D4-D6:

D6-D7:

D7-D8: