2008 Nissan-Datsun Sentra Base, Automatic CVTFACTORY OEM SERVICE PROCEDURE

Front Door Key Cylinder Switch LH Check

  1. CHECK FRONT DOOR KEY CYLINDER SWITCH LH 

    With CONSULT-III 

    Check front door key cylinder switch ("KEY CYL LK-SW") and ("KEY CYL UN-SW) in DATA MONITOR mode in CONSULT-III. Refer to "DATA MONITOR ".

    • When key inserted and front key cylinder is turned to LOCK:

      KEY CYL LK-SW : ON 

    • When key inserted and front key cylinder is turned to UNLOCK:

      KEY CYL UN-SW : ON 

    Without CONSULT-III 

    Check voltage between BCM connector M18 terminals 7, 8 and ground.

    BCM CONNECTOR TERMINAL VOLTAGE SPECIFICATION

    Connector Terminals Condition Voltage (V) (Approx.)
    ( + ) ( - )
    M18 7 Ground Neutral/Lock 5
    Unlock 0
    8 Neutral/Unlock 5
    Lock 0
    Fig 1: Checking Voltage Between BCM Connector M18 Terminals 7, 8 And Ground
    G04927578Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: Front door key cylinder switch LH signal is OK.

    NG: GO TO 2.

  2. CHECK FRONT DOOR KEY CYLINDER SWITCH LH GROUND HARNESS 
    1. Turn ignition switch OFF.
    2. Disconnect front door key cylinder switch LH.
    3. Check continuity between front door key cylinder switch LH connector D9 terminal 4 and body ground.
      CONNECTOR TERMINAL CONTINUITY SPECIFICATION

      Connector Terminals Continuity
      D9 4 - Ground Yes

    OK or NG 

    OK: GO TO 3.

    NG: Repair or replace harness.

    Fig 2: Checking Continuity Between Front Door Key Cylinder Switch LH Connector D9 Terminal 4 And Body Ground
    G04927579Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK DOOR KEY CYLINDER SWITCH LH 

    Check continuity between front door key cylinder switch LH terminals.

    CONNECTOR TERMINAL CONTINUITY SPECIFICATION

    Terminals Door key cylinder switch position Continuity
    4 - 6 Neutral/Unlock No
    Lock Yes
    4 - 5 Neutral/Lock No
    Unlock Yes

    OK or NG 

    OK: GO TO 4.

    NG: Replace front door key cylinder switch LH. Refer to "FRONT DOOR LOCK ".

    Fig 3: Checking Continuity Between Front Door Key Cylinder Switch LH Terminals
    G04927580Courtesy of NISSAN MOTOR CO., U.S.A.
  4. CHECK DOOR KEY CYLINDER HARNESS 
    1. Disconnect BCM connector M18.
    2. Check continuity between BCM connector M18 (A) terminals 7, 8 and front door key cylinder switch LH connector D9 (B) terminals 5, 6 and body ground.
      CONNECTOR TERMINAL CONTINUITY SPECIFICATION

      Connector Terminal Connector Terminal Continuity
      A: M18 7 B: D9 5 Yes
      8 6 Yes
      7 Ground No
      8 Ground No

    OK or NG 

    OK: Front door key cylinder switch LH circuit is OK.

    NG: Repair or replace harness.

    Fig 4: Checking Door Key Cylinder Harness
    G04927581Courtesy of NISSAN MOTOR CO., U.S.A.
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

Rather have a pro handle this?

A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.

Comes to youSame-day available12-month warranty
Get a Free Quote

No obligation. See pricing before you book.