7. ABS Warning Lamp Stays On When Ignition Switch Is Turned On

WARNING: This page is about a different car, the 2003 Nissan Altima. However, it is still accessible from the selected car via links, so may be relevant.

INSPECTION START
ABS control unit inspection.
1. : GO TO 2.
Fig 1: Inspecting ABS Control Unit
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK WARNING LAMP
1. Disconnect ABS actuator and electric unit (control unit) connector.
2. Connect suitable wire between ABS actuator and electric unit (control unit) connector terminal 21 and ground.
  Does warning lamp activate?
  1. Yes: GO TO 3.
  2. No: Repair combination meter. Check the following.
    - Harness connector E125
    - Harness for open or short between ABS actuator and electric unit (control unit) and fuse If NG, repair harness or connector.
  Fig 2: Connecting Suitable Wire Between ABS Actuator And Electric Unit Connector Terminal 21 And Ground
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK HARNESS CONNECTOR
Check ABS actuator and electric unit (control unit) pin terminals for damage and the connection of harness connector. Reconnect ABS actuator and electric unit (control unit) harness connector. Then retest.
1. OK: INSPECTION END.
2. NG: GO TO 4.
CHECK ABS MOTOR GROUND
1. Turn ignition switch OFF.
2. Check continuity between ABS motor and ground.
  Does continuity exist?
  1. Yes: Replace ABS actuator and electric unit (control unit).
  2. No: Check the following.
    - ABS motor ground harness
    - ABS motor ground harness for open or short between ABS motor and ground If NG, repair harness.