LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 2018 >> QX60 AWD >> Repair and Diagnosis (Single Page) >> Body & Frame >> Door Locks >> Security Control System (DTC/Circuit Diagnosis) >> DTC/Circuit Diagnosis >> DTC B2604: Shift Position >> Diagnosis Procedure >> Security Control System (DTC/Circuit Diagnosis)
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Security Control System (DTC/Circuit Diagnosis)

  1. CHECK CVT SHIFT SELECTOR SWITCH FUNCTION 
    1. Turn ignition switch ON.
    2. Select "SFT P -MET", "SFT N -MET" and "SFT PN/N SW" in DATA MONITOR mode with CONSULT.
    3. Check "SFT P -MET", "SFT N -MET" and "SFT PN/N SW" indication under the following conditions.

      Monitor item

      Condition

      Indication

      SFT P -MET

      CVT Shift selector

      Selector lever is in any position except the P (Park) position

      OFF

      Selector lever is in the P (Park) position

      ON

      SFT N -MET

      CVT Shift selector

      Selector lever is in any position except the N (Neutral) position

      OFF

      Selector lever is in the N (Neutral) position

      ON

      SFT PN/N SW

      CVT Shift selector

      Selector lever is in and position except the P (Park) or N (Neutral) position

      OFF

      Selector lever is in the P (Park) or N (Neutral) position

      ON

    Is the inspection result normal?

    YES

    Refer to Intermittent Incident .

    NO

    If SFT N -MET or SFT P -MET is incorrect. GO TO 7.

    NO

    If SFT PN/N SW is incorrect. GO TO 2.

  2. CHECK DTC OF TCM 

    Check DTC in "Self-Diagnostic Result" mode of "TCM" using CONSULT.

    Is DTC detected?

    YES

    Perform the trouble diagnosis related to the detected DTC. Refer to DTC Logic .

    NO

    GO TO 3.

  3. CHECK BCM INPUT SIGNAL 
    1. Turn ignition switch ON.
    2. Check voltage between BCM harness connector and ground.

      (+)

      (-)

      Condition

      Voltage (V)

      (Approx.)

      BCM

      Connector

      Terminal

      M18

      39

      Ground

      Selector lever

      P (Park) or N (Neutral) position

      Battery voltage

      Other than above

      0

    Is the inspection result normal?

    YES

    GO TO 4.

    NO

    GO TO 5.

  4. REPLACE BCM 
    1. Replace BCM. Refer to Removal and Installation .
    2. Perform initialization of BCM and registration of all Intelligent Keys using CONSULT.

    Inspection End.

  5. CHECK BCM INPUT SIGNAL CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect transmission range switch connector.
    3. Disconnect BCM connector.
    4. Check continuity between transmission range switch harness connector and BCM harness connector.

      Transmission range switch

      BCM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      F29

      10

      M18

      39

      Yes

    5. Check continuity between transmission range switch harness connector and ground.

      Transmission range switch

      Ground

      Continuity

      Connector

      Terminal

      F29

      10

      No

    Is the inspection result normal?

    YES

    GO TO 6.

    NO

    Repair or replace harness.

  6. CHECK INTERMITTENT INCIDENT 

    Refer to Intermittent Incident .

    Inspection End.

  7. CHECK CVT SHIFT SELECTOR RANGE SWITCH FUNCTION (METER) 
    1. Turn ignition switch ON.
    2. Select "SHIFT IND" in DATA MONITOR mode (METER) with CONSULT.
    3. Check "SHIFT IND" indication under the following conditions.

      Monitor item

      Condition

      Indication

      SHIFT IND

      CVT Shift selector

      P (Park) position

      P

      N (Neutral) position

      N

    Is the inspection result normal?

    YES

    Inspection End.

    NO

    Refer to CONSULT Function (METER/M&A) .