Headlamp LO Does Not Illuminate (Both Sides)

WARNING: This page is about a different car, the 2004 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.

CHECK COMBINATION SWITCH INPUT SIGNAL
Select "BCM" on CONSULT-II. With "HEAD LAMP" data monitor, make sure "HEAD LAMP SW1" and "HEAD LAMP SW2" turns ON-OFF linked with operation of lighting switch.
1. When lighting switch is in 2ND position: HEAD LAMP SW1 ON
2. : HEAD LAMP SW2 ON
OK or NG
1. OK: GO TO 2.
2. NG: Check lighting switch. Refer to COMBINATION SWITCH INSPECTION .
  
  Fig 1: CONSULT-II Display - Data Monitor
  Courtesy of NISSAN MOTOR CO., U.S.A.
HEADLAMP ACTIVE TEST
1. Select "IPDM E/R" on CONSULT-II and select "ACTIVE TEST" on "SELECT DIAG MODE" screen.
2. Select "LAMPS" on "SELECT TEST ITEM" screen.
3. Touch "LO" screen.
4. Make sure headlamp low beam operates.
  Headlamp low beam should operate.
OK or NG
1. OK: GO TO 3.
2. NG: GO TO 4 .
  
  Fig 2: CONSULT-II Display - Active Test
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK IPDM E/R
1. Select "IPDM E/R" on CONSULT-II and select "DATA MONITOR" on "SELECT DIAG MODE" screen.
2. Make sure "HL LO REQ" turns ON when lighting switch is in 2ND position.
  1. When lighting switch is in 2ND position: HL LO REQ ON
OK or NG
1. OK: Replace IPDM E/R. Refer to REMOVAL AND INSTALLATION OF IPDM E/R .
2. NG: Replace BCM. Refer to REMOVAL AND INSTALLATION OF BCM .
  
  Fig 3: CONSULT-II Display - Data Monitor
  Courtesy of NISSAN MOTOR CO., U.S.A.

CHECK HEADLAMP INPUT SIGNAL

Turn ignition switch OFF.
Disconnect headlamp RH and LH connector.
Select "IPDM E/R" on CONSULT-II and select "ACTIVE TEST" on "SELECT DIAG MODE" screen.
Select "LAMPS" on "SELECT TEST ITEM" screen.
Touch "LO" screen.
When headlamp low beam is operating, check voltage between headlamp RH and LH harness connector and ground.

HEADLAMP RH & LH TERMINAL VOLTAGE CHART

Terminals				Voltage
(+)			(-)
Connector	Terminal (Wire color)
RH	E12	1 (R/Y)	Ground	Battery voltage
LH	E44	ML)

Fig 4: Checking Voltage Between Headlamp RH & LH Harness Connector & Ground

Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG

OK: GO TO 6 .
NG: GO TO 5.

CHECK HEADLAMP CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R connector.
3. Check continuity between IPDM E/R harness connector E122 terminal 20 (R/Y) and headlamp RH harness connector E12 terminal 1 (R/Y).
  1. 20 (R/Y) - 1 (R/Y): Continuity should exist.
4. Check continuity between IPDM E/R harness connector E122 terminal 30 (L) and headlamp LH harness connector E44 terminal 1 (L).
  1. 30 (L) -1 (L): Continuity should exist.
OK or NG
1. OK: Replace IPDM E/R. Refer to REMOVAL AND INSTALLATION OF IPDM E/R .
2. NG: Repair harness or connector.
  
  Fig 5: Checking Continuity Between IPDM E/R Harness Connector E122 Terminals And Headlamp Harness Connectors Terminal 1
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK HEADLAMP GROUND
1. Turn ignition switch OFF.
2. Check continuity between headlamp RH harness connector E12 terminal 2 (B) and ground.
  1. 2 (B) - Ground: Continuity should exist.
3. Check continuity between headlamp LH harness connector E44 terminal 2 (B) and ground.
  1. 2 (B) - Ground: Continuity should exist.
OK or NG
1. OK: Check headlamp connector for damage or poor connection. Repair as necessary.
2. NG: Repair harness or connector.

Fig 6: Checking Continuity Between Headlamp Rh & LH Harness Connectors Terminal 2 (B) And Ground

Courtesy of NISSAN MOTOR CO., U.S.A.