Filament 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.

When measuring voltage, wrap tin foil around the top of the negative probe. Then press the foil against the wire with your finger.

Fig 1: Displaying Method For Measuring Defogger Filament Voltage
Courtesy of NISSAN MOTOR CO., U.S.A.
Attach probe circuit tester (in Volt range) to middle portion of each filament.

Fig 2: Testing Defogger Filament By Probing Circuit
Courtesy of NISSAN MOTOR CO., U.S.A.
If a filament is burned out, circuit tester registers 0 or battery voltage.
To locate burned out point, move probe to left and right along filament. Test needle will swing abruptly when probe passes the point.

Fig 3: Locating Burned Out Point On Defogger Filament
Courtesy of NISSAN MOTOR CO., U.S.A.