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Home >> Infiniti >> 2004 >> QX56 RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1236 (Auto Cruise Control System) >> Auto Cruise Control System - ICC >> Trouble Diagnosis For Self-Diagnostic Items >> DTC 12: VDC Control Unit

DTC 12: VDC Control Unit

WARNING: This page is about a different car, the 2005 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.
  1. DIAGNOSIS CHECK 

    With CONSULT-II

    Perform self-diagnosis of ABS actuator and electric unit (control unit). Is malfunction indicated?

    YES or NO 

    • YES: Repair or replace as necessary. Erase DTC and perform ICC system running test. Refer to "ICC SYSTEM RUNNING TEST ". Then perform self-diagnosis of ICC system again.
    • NG: GO TO 2.
  2. CHECK CONNECTOR ICC UNIT AND ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) 
    1. Turn ignition switch OFF.
    2. Disconnect ICC unit, and ABS actuator and electric unit (control unit) connectors, and connect them securely again. Erase DTC, then perform self-diagnosis of ICC system again.

    OK or NG

    • OK: Poor connector connection. Check connector housing for disconnected, loose, bent and collapsed terminals. If any malfunction is detected, repair as necessary. Erase DTC and perform ICC system running test. Refer to "ICC SYSTEM RUNNING TEST ". Then perform self-diagnosis of ICC system again.
    • NG: GO TO 3.
  3. CHECK HARNESS BETWEEN ICC UNIT AND ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) 
    1. Turn ignition switch OFF.
    2. Disconnect ICC unit, and ABS actuator and electric unit (control unit) connectors.
    3. Check continuity between ICC unit harness connector B13 terminal 10 (V/R), and ABS actuator and electric unit (control unit) connector E125 terminal 7 (V/R).
      Fig 1: Checking Continuity Between ICC Unit Harness Connector B13 Terminal 10 (V/R), And ABS Actuator And Electric Unit (Control Unit) Connector E125 Terminal 7 (V/R)
      G02385984Courtesy of NISSAN MOTOR CO., U.S.A.
      • Continuity should exist. 

    OK or NG

    • OK: Replace ICC unit. Refer to "ICC UNIT ". Erase DTC and perform ICC system running test. Refer to "ICC SYSTEM RUNNING TEST ". Then perform self-diagnosis of ICC system again.
    • NG:
      • Repair harness between ICC unit, and ABS actuator and electric unit (control unit).
      • Erase DTC and perform ICC system running test. Refer to "ICC SYSTEM RUNNING TEST ". Then perform self-diagnosis of ICC system again.
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