3. Check UART Line Harness

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

Disconnect driver seat control unit and automatic drive positioner control unit.
Check continuity between driver seat control unit connector P2 terminal 1, 17, and automatic drive positioner connector M33 terminal 10, 26.
1 (L) - 10 (L) : Continuity should exist.

17 (W) - 26 (W) : Continuity should exist.
Check continuity between driver seat control unit connector P2 terminal 1, 17 and ground.
1 (L) - Ground : Continuity should not exist.

17 (W) - Ground : Continuity should not exist.

Fig 1: Checking Continuity

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

OK or NG

OK >> GO TO 4.
NG >> Repair or replace harness.