Illumination Signal Check

WARNING: This page is about a different car, the 2004 Infiniti G35. However, it is still accessible from the selected car via links, so may be relevant.

TAIL LAMP OPERATION CHECK
When lighting switch turned 1st or 2nd position, does tail lamp illuminate?

YES or NO
1. YES: GO TO 2.
2. NO: Go to tail lamp trouble diagnosis. Refer to PARKING, LICENSE PLATE & TAIL LAMPS DO NOT ILLUMINATE .
ILLUMINATION SIGNAL CHECK
1. Check voltage between NAVI control unit and ground.
  
  Fig 1: NAVI Control Unit And Ground Voltage Table
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 2: Checking Voltage Between NAVI Control Unit And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: Replace NAVI control unit.
2. NG: Check harness for open or short between NAVI control unit and IPDM E/R.