Test D: The Headlamp(s) Are On Continuously

PINPOINT TEST D: THE HEADLAMP(S) ARE ON CONTINUOUSLY

Normal Operation - Low Beams
The smart junction box (SJB) sends reference signals to the headlamp switch through circuits CLF19 (VT/GN) (AUTOLAMPS), CLF23 (WH/VT) (OFF), CLS34 (GY) (PARKING LAMPS) and CLF18 (BU/WH) (HEADLAMPS). At any given time, the headlamp switch routes one of the input circuits to ground through joint connector 6 through circuit GD116 (BK/VT).

When the SJB detects the headlamp switch in the HEADLAMPS ON position and the multifunction switch in the LOW BEAM position, the SJB provides voltage through circuits CLF04 (BN/BU) and CLF05 (BU/GN) to the LH and RH low beam headlamps, respectively.

On vehicles equipped with autolamps, the SJB also monitors input from the windshield wiper motor through circuit CRW01 (WH) for the headlamps on with wipers on feature.

High Beams
The SJB sends a reference signal to the multifunction switch through circuits CLF27 (GN/BN) and CLF17 (WH/OG). When the multifunction switch is placed in the FLASH-TO-PASS or HIGH BEAM position, the voltage signal is routed to ground. When the SJB detects a request for flash-to-pass or high beams (when the low beams are on), the SJB energizes the high beam relay (integrated into the SJB), which routes voltage through circuit CLF08 (YE/VT) to the headlamps.

Part 1:

Part 2:

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Joint connector
- Headlamp switch
- Multifunction switch
- Windshield wiper motor
- SJB

D1-D3:

D4-D6:

D7-D8:

D9-D15:

D15-D16: