4. Check Signal For Motor Side

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

Confirm A/C LAN signal between mode door motor harness connector M40 terminal 3 (L/B), driver side air mix door motor harness connector M39 terminal 3 (L/B), passenger side air mix door motor harness connector M87 terminal 3 (L/B) and ground using an oscilloscope. See Fig 1 and Fig 2 .

Fig 1: Identifying Door Motor Connector Terminals

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

Fig 2: Confirming A/C LAN Signal Using An Oscilloscope

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

OK or NG

OK, GO TO 5.
NG, Repair harness or connector.