Headlamp LO Does Not Illuminate (One Side)

WARNING: This page is about a different car, the 2005 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.

BULB INSPECTION
Inspect ballasts (HID control unit) and xenon bulb of inoperative headlamp bulb.

OK or NG
- OK: GO TO 2.
- NG:
  - (step1) Replace xenon bulb with other side bulb or new one. (If lamp illuminates correctly, replace the xenon bulb).
  - (step2) Replace ballast (HID control unit) with other side ballast or new one. (If lamp illuminates correctly, replace the ballast).
CHECK POWER TO HEADLAMP
1. Disconnect inoperative headlamp connector.
2. Turn the low beam headlamps ON.
3. Check voltage between inoperative headlamp connector terminal and ground.
  
  Fig 1: Inoperative Headlamp Connector Terminal And Ground Voltage Specification Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 2: Checking Voltage Between Inoperative Headlamp Connector Terminal And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
- OK: GO TO 3.
- NG: GO TO 4.
CHECK HEADLAMP GROUND
1. Turn the low beam headlamps OFF.
2. Check continuity between inoperative headlamp connector terminal and ground.
  
  Fig 3: Inoperative Headlamp Connector Terminal And Ground Continuity Specification Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 4: Checking Continuity Between Inoperative Headlamp Connector Terminal And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
- OK: Check headlamp and IPDM E/R connector. Repair as necessary.
- NG: Repair open circuit in harness between inoperative headlamp and ground.
INSPECTION BETWEEN IPDM E/R AND HEADLAMPS
1. Disconnect IPDM E/R connector.
2. Check continuity between harness connector terminals of IPDM E/R and harness connector terminals of inoperative headlamp.
  
  Fig 5: Harness Connector Terminals Of IPDM E/R And Harness Connector Terminals Of Inoperative Headlamp Continuity Specification Chart
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 6: Checking Continuity Between Harness Connector Terminals Of IPDM E/R And Harness Connector Terminals Of Inoperative Headlamp
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
- OK: Replace IPDM E/R. Refer to "REMOVAL AND INSTALLATION OF IPDM E/R ".
- NG: Check for short circuits and open circuits in harness between IPDM E/R and headlamps. Repair as necessary.