2011 Nissan-Datsun Sentra SE-RFACTORY OEM SERVICE PROCEDURE

Combination Switch Reading Function

  1. Description
    • BCM reads combination switch (light, wiper) status, and controls various electrical components according to the results.
    • BCM reads information of a maximum of 20 switches by combining five output terminals (OUTPUT 1-5) and five input terminals (INPUT 1-5).
  2. Operation description
    • BCM activates transistors of output terminals (OUTPUT 1-5) periodically and allows current to flow in turn.
    • If any (1 or more) of the switches are turned ON, circuit of output terminals (OUTPUT 1-5) and input terminals (INPUT 1-5) becomes active.
    • At this time, transistors of output terminals (OUTPUT 1-5) are activated to allow current to flow. When voltage of input terminals (INPUT 1-5) corresponding to that switch changes, interface in BCM detects voltage change and BCM determines that switch is ON.
      Fig 1: BCM Combination Switch Communication Diagram
      G04928502Courtesy of NISSAN MOTOR CO., U.S.A.
  3. BCM - Operation table of combination switch
    • BCM reads operation status of combination switch by the combination shown in the following table.
      BCM COMBINATION SWITCH INPUT AND OUTPUT CHART

        COMB SW OUTPUT 1 COMB SW OUTPUT 2 COMB SW OUTPUT 3 COMB SW OUTPUT 4 COMB SW OUTPUT 5
      ON OFF ON OFF ON OFF ON OFF ON OFF
      COMB SW INPUT 1 - - FR WIPER HI ON FR WIPER HI OFF INT VOLUME 1 ON INT VOLUME 1 OFF - - INT VOLUME 2 ON INT VOLUME 2 OFF
      COMB SW INPUT 2 FR WASHER ON FR WASHER OFF - - - - INT VOLUME 3 ON INT VOLUME 3 OFF    
      COMB SW INPUT 3 FR WIPER LOW ON FR WIPER LOW OFF FR WIPER INT ON FR WIPER INT OFF - - - - - -
      COMB SW INPUT 4 TURN LH ON TURN LH OFF PASSING ON PASSING OFF HEADLAMP 2 ON HEADLAMP 2 OFF - - FR FOG ON FR FOG OFF
      COMB SW INPUT 5 TURN RH ON TURN RH OFF HEADLAMP 1 ON HEADLAMP 1 OFF HI BEAM ON HI BEAM OFF LIGHTING SW (1st) ON LIGHTING SW (1st) OFF - -
      NOTE: Headlamp has a dual system switch.
  4. Example operation: (When lighting switch 1st position is turned ON)
    • When lighting switch 1st position is turned ON, contact in combination switch turns ON. At this time if OUTPUT 4 transistor is activated, BCM detects that voltage changes in INPUT 5.
    • When OUTPUT 4 transistor is ON, BCM detects that voltage changes in INPUT 5, and judges lighting switch 1st position is ON. Then BCM sends tail lamp ON signal to IPDM E/R using CAN communication.
    • When OUTPUT 4 transistor is activated again, BCM detects that voltage changes in INPUT 5 and recognizes that lighting switch 1st position is continuously ON.
      Fig 2: BCM Combination Switch Communication Diagram
      G04928504Courtesy of NISSAN MOTOR CO., U.S.A.
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