2. Check Ground Circuit For Unified Meter And A/C Amp.

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.

Turn ignition switch OFF.
Check continuity between unified meter and A/C amp. harness connector M50 terminal 29 (B), 30 (B) and ground. See Figure and Fig 1 .
1. 29, 30 - Ground : Continuity should exist.

OK or NG

OK, Replace unified meter and A/C amp.
NG, Repair harness or connector.

Fig 1: Identifying Unified Meter And A/C Amp. (Automatic Amplifier) Ground Circuit Terminals

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