Test E: The Headlamps Are On Continuously

PINPOINT TEST E: THE HEADLAMPS ARE ON CONTINUOUSLY

E1-E2:

E3-E6:

E7-E12:

E12-E14:

Normal Operation - Halogen Low Beam Headlamps
The smart junction box (SJB) sends reference signals to the headlamp switch through circuits CLF18 (BU/WH), CLF19 (VT/GN), CLF23 (WH/VT) and CLS34 (GY). At any given time, the headlamp switch routes one of the input circuits to ground 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 sends voltage through circuit CLF04 (BN/BU) and circuit CLF05 (BU/GN) to the LH and RH low beam headlamps, respectively.

Normal Operation - High Intensity Discharge (HID) Low Beam Headlamps
The SJB sends reference signals to the headlamp switch through circuits CLF18 (BU/WH), CLF19 (VT/GN), CLF23 (WH/VT) and CLS34 (GY). At any given time, the headlamp switch routes one of the input circuits to ground 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 sends voltage through circuit CLF04 (BN/BU) and circuit CLF05 (BU/GN) to the LH and RH HID relay coils, respectively. When the relays are energized, voltage is routed to the LH and RH headlamps through circuit CLF30 (VT/BN) and circuit CLF31 (YE/GY), respectively.

Normal Operation - High Beam Headlamps
When the SJB detects the headlamp switch in the HEADLAMPS ON position and the multifunction switch in the HIGH BEAM position, the SJB sends voltage through circuit CLS08 (VT/GN) to the high beam headlamps.

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, the SJB sends voltage to the high beam headlamps.

DTC B1472 - is an on-demand code that sets when the SJB detects the headlamps on input circuit is short to ground.

DTC B1510 - is an on-demand code that sets when the SJB detects the flash-to-pass request input circuit is short to ground.

DTC B1570 - is an on-demand code that sets when the SJB detects the high beam request input circuit is short to ground.

DTC B2498 - is a continuous code that sets when the SJB detects no inputs from the headlamp switch or multiple headlamp switch requests at the same time.

Possible Causes
- Circuit CLF04 (BN/BU) short to voltage
- Circuit CLF05 (BU/GN) short to voltage
- Circuit CLF17 (WH/OG) short to ground
- Circuit CLF27 (GN/BN) short to ground
- Circuit CLF18 (BU/WH) open or short to ground
- Circuit CLF19 (VT/GN) open or short to ground
- Circuit CLF23 (WH/VT) open or short to ground
- Circuit CLF30 (VT/BN) short to voltage
- Circuit CLF31 (YE/GY) short to voltage
- Circuit CLS08 (VT/GN) short to voltage
- Circuit CLS34 (GY) open or short to ground
- Circuit GD116 (BK/VT) open
- HID relay
- Multifunction switch
- Headlamp switch
- SJB