UART Communication Line Circuit Inspection
WARNING: This page is about a different car, the 2007 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK UART LINE HARNESS
- Turn ignition switch OFF.
- Disconnect driver seat control unit and automatic drive positioner control unit.
- Check continuity between driver seat control unit connector B401 terminals 1, 17 and automatic drive positioner connector M41 terminals 10, 26.
1 - 10: Continuity should exist.
17 - 26: Continuity should exist.
- Check continuity between driver seat control unit connector B402 terminals 1, 17 and ground.
1 - Ground: Continuity should not exist.
17 - Ground: Continuity should not exist.
OK or NG
OK: GO TO 2.
NG: Repair or replace harness.
- CHECK UART LINE INPUT/OUTPUT SIGNAL 1
Check signal between driver seat control unit connector and ground, with oscilloscope.
UART LINE INPUT/OUTPUT SIGNAL 1Connector Terminals Condition Signal (+) (-) B401 17 Ground Seat memory switch ON (1 or 2 operation) Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
OK: GO TO 3.
NG: Replace driver seat control unit.
- CHECK UART LINE INPUT/OUTPUT SIGNAL 2
Check signal between automatic driver positioner control unit connector ground, with oscilloscope.
UART LINE INPUT/OUTPUT SIGNAL 2Connector Terminals Condition Signal (+) (-) M41 10 Ground Seat memory switch ON (1 or 2 operation) Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
OK: GO TO 4.
NG: Replace automatic driver positioner control unit.
- CHECK DRIVER SEAT CONTROL UNIT
Does the automatic drive positioner function when the driver control unit is exchanged?
Yes or No
YES: Replace driver seat control unit.
NO: Replace automatic drive positioner control unit.