Test E: The Headlamps Are On Continuously

PINPOINT TEST E: THE HEADLAMPS ARE ON CONTINUOUSLY

E1-E5:

E5-E10:

E11-E12:

E12-E17:

Normal Operation
The smart junction box (SJB) sends voltage reference signals to the headlamp switch through circuits 1400 (TN/WH), 1401 (BK/LG), and 1402 (RD/WH). At any given time, the headlamp switch routes one of the input circuits to ground through circuit 1205 (BK).

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 circuits 1338 (WH) and 1336 (LG/WH) to the LH and RH low beams, respectively.

The SJB sends a voltage reference signal to the multifunction switch through circuits 1394 (WH/RD) and 1395 (RD/PK). When the multifunction switch is placed in the FLASH-TO-PASS or HIGH BEAM position, the signal is routed back to the SJB (ground internal to the SJB). When the SJB detects a request for flash-to-pass or high beams, the SJB provides ground to the high beam relay through circuit 1708 (LG/BK). When the high beam relay is energized, voltage is provided through circuits 1337 (VT/YE) and 1335 (YE/WH) to the LH and RH high beams, respectively.

DTC B1470 - sets when the SJB detects an unexpected or conflicting value from the headlamp switch input circuits, such as an open or short to ground.

DTC B2501 - sets when the SJB detects a short to voltage on the LH headlamp voltage supply circuit.

DTC B2503 - sets when the SJB detects a short to voltage on the RH headlamp voltage supply circuit.

DTC B2586 - sets when the SJB detects a short to ground from either of the multifunction switch input circuits.

DTC B2598 - sets when the SJB detects a short to ground on the high beam relay coil ground controlled circuit.

Possible Causes
- Circuit 1205 (BK) open
- Circuit 1335 (YE/WH) short to voltage
- Circuit 1336 (LG/WH) short to voltage
- Circuit 1337 (VT/YE) short to voltage
- Circuit 1338 (WH) short to voltage
- Circuit 1394 (WH/RD) short to ground
- Circuit 1395 (RD/PK) short to ground
- Circuit 1400 (TN/WH) open
- Circuit 1401 (BK/LG) open
- Circuit 1402 (RD/WH) short to ground
- Circuit 1708 (LG/BK) short to ground
- High beam relay
- Headlamp switch
- Multifunction switch
- BEC
- SJB