2008 Nissan-Datsun Sentra SE-RFACTORY OEM SERVICE PROCEDURE

Key Switch Check

  1. CHECK KEY SWITCH INPUT SIGNAL 

    With CONSULT-III 

    Check key switch "KEY ON SW" in DATA MONITOR mode with CONSULT-III. Refer to "DATA MONITOR ".

    • When key is inserted into ignition key cylinder:

      KEY ON SW : ON 

    • When key is removed from ignition key cylinder:

      KEY ON SW : OFF 

    Without CONSULT-III 

    Check voltage between BCM connector and ground.

    CONNECTOR TERMINAL VOLTAGE SPECIFICATION

    Connector Terminals Condition Voltage (V) (Approx.)
    ( + ) ( - )
    M18 37 Ground Key is inserted. Battery voltage
    Key is removed. 0
    Fig 1: Checking Voltage Between BCM Connector And Ground
    G04902460Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: Key switch circuit is OK.

    NG: GO TO 2.

  2. CHECK KEY SWITCH 
    1. Turn ignition switch OFF.
    2. Disconnect key switch connector.
    3. Check key switch.
      CONNECTOR TERMINAL CONTINUITY SPECIFICATION

      Terminals Condition Continuity
      1 - 2 Key is inserted. Yes
      Key is removed. No

    OK or NG 

    OK: Check the following.

    • 10A fuse [No. 19, located in fuse block (J/B)]
    • Harness for open or short between key switch and fuse
    • Harness for open or short between BCM and key switch
      Fig 2: Checking Key Switch
      G04927563Courtesy of NISSAN MOTOR CO., U.S.A.

    NG: Replace key switch.

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.