Nissan 240sx S13 Accessories / Safety Equipments: Automatic Seat Belt

Nissan 240sx S13

OPERATION

Shoulder belt buckle mainly operates while ignition is ON.

IGNITION SWITCH IS ON

When door is opened, shoulder buckle is moved forward and when door is closed, buckle is moved rearward.

IGNITION SWITCH IS OFF

When door is opened, shoulder buckle is moved forward. When door is closed, buckle will remain is this position

Fig. 1: Automatic Seat Belt Quick Test

TIMER (IGNITION SWITCH EITHER ON OR OFF)

If limit switch does not operate (when accomplishing forward operation, front limit switch cannot be turned OFF or when accomplishing rearward operation, rear limit switch cannot be turned OFF, control unit will continue to supply power to drive motor for 15 seconds and control unit will stop supplying power.

QUICK WARNING (IGNITION SWITCH ON)

If front limit switch is not turned OFF after accomplishing forward operation, control unit will stop supplying power 15 seconds later and warning lamp will flash and chime will operate rapidly for approximately 6 seconds.

REAR LOCK

If quick warning functions twice successively while ignition switch is ON, shoulder belt buckle will move to rear position when door is closed as normal but will remain in rear position even if door is opened. This function is canceled when ignition switch is OFF.

HARNESS LAYOUT

Harness Layout

Fig. 2: Harness Layout Location

Fig. 3: Right Hand Front Limit Switch

Fig. 4: Warning Lamp

Fig. 5: Door Latch Switch

Fig. 6: Warning Chime and Left Hand Front Limit Switch

Fig. 7: Driver's Side Wiring Harness Layout

Fig. 8: Quick Pinpoint Check Circuit Diagram

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SEAT BELT WARNING

SHOULDER ANCHORS ARE NOT AT REAR LOCK POSITION

Fig. 9: Shoulder Anchors Not At Rear Lock Position; Ignition Sw. ON

SHOULDER BELTS ARE NOT FASTENED

Fig. 10: Shoulder Anchors Not At Rear Lock Position; Ign. Sw. OFF to ON

DRIVER SIDE LAP BELT IS NOT FASTENED

Fig. 11: Shoulder Belts Are Not Fastened; Ignition Sw. ON

NORMAL (ALL BELTS ARE FASTENED AND SHOULDER ANCHORS ARE IN REAR LOCK POSITION)

Fig. 12: Driver Side Lap Belt Is Not Fastened; Ignition Sw. OFF to ON

Fig. 13: NORMAL (All Belts Fastened and Shoulder Anchors In Rear Lock Position); Ignition Sw. OFF to ON

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TROUBLE SHOOTING

DESCRIPTION

Since left and right component parts are basically the same, harness layout and methods for electrical components inspection are shown for one side only. Although methods for checking component parts on both sides are described in the flow chart, making it easier to troubleshoot, apply checking procedures to either side that have malfunction during trouble diagnosis. For
those methods enclosed by double rectangulars, however, component parts on both sides must be checked as problems occurring on either side cannot be easily determined by a symptom.

SYMPTOMS

No Operation Has Made. No Warning Indicated and No Buckles Movement Performed

• Main Power Supply and Ground Circuit Check (Diagnostic Procedure 1)
• Diagnostic Procedures 1, 3 and 4
• The following Electrical Components Inspection: Warning Lamp, Warning Chime, LEFT SIDE (Front limit Switch, Rear Limit Switch, Door Latch Switch, Shoulder Belt Buckles Switch, Motor, Lap Belt Switch), RIGHT SIDE (Front Limit Switch, Rear Limit Switch, Door Latch Switch, Shoulder Belt Buckles Switch, Motor) Shoulder Belt Buckle In L.H. or R.H. Side Does Not Move
• Preliminary Check (Diagnostic Procedure 1)
• Main Power Supply and Ground Circuit Check (Diagnostic Procedure 2)
• Diagnostic Procedures 1, 3 and 4
• The following Electrical Components Inspection: Warning Lamp, Warning Chime, LEFT & RIGHT Side (Front and Rear Limit Switch, Motor) Shoulder Belt Buckle Moves FORWARD Only
• Preliminary Check (Diagnostic Procedure 1)
• Diagnostic Procedures 2 and 4
• The following Electrical Components Inspection: LEFT and RIGHT Side (Rear Limit and Door Latch Switch) Shoulder Belt Buckle Moves REARWARD Only
• Preliminary Check (Diagnostic Procedure 1)
• Diagnostic Procedures 2 and 3
• The following Electrical Components Inspection: LEFT & RIGHT Side (Front Limit and Door Latch Switch) Warnings Indicate Incorrectly Or Do Not Function
• Preliminary Check (Diagnostic Procedure 2)
• Diagnostic Procedures 4-8
• The following Electrical Components Inspection: Warning Lamp and Chime, LEFT SIDE (Rear Limit and Shoulder Belt Buckle Switch, Lap Belt Switch), RIGHT SIDE (Rear Limit and Shoulder Belt Buckle Switch) Quick Warning Operates
• Diagnostic Procedure 3
• The following Electrical Components Inspection: LEFT & RIGHT Side (Front Limit Switch)

PROCEDURE 1 (PRELIMINARY CHECK)

Fig. 14: Diagnostic Procedure 1 (Preliminary Check - 1 of 2)

Fig. 15: Diagnostic Procedure 1 (Preliminary Check - 2 of 2)

Fig. 16: MAIN POWER SUPPLY TABLE

GROUND CIRCUIT

• Terminals
  • 29 and Ground
    • Continuity: Yes
  • 37 and Ground
    • Continuity: Yes
  • 46 and Ground
    • Continuity: Yes

PROCEDURE 2 (PRELIMINARY CHECK)

Fig. 17: Diagnostic Procedure 2 (Preliminary Check - 1 of 2)

Fig. 18: Diagnostic Procedure 2 (Preliminary Check - 2 of 2)

POWER SUPPLY FOR MOTOR DRIVE

• Terminals
  • 39 and Ground
    • Application: Left Hand Side
    • Continuity: Yes
  • 44 and Ground
    • Application: Right Hand Side
    • Continuity: Yes

GROUND CIRCUIT FOR MOTOR DRIVE

• Terminals
  • 37 and Ground
    • Application: Left Hand Side
    • Continuity: Yes
  • 46 and Ground
    • Application: Right Hand Side
    • Continuity: Yes

DIAGNOSTIC PROCEDURE CHARTS

DIAGNOSTIC PROCEDURE 1

Fig. 19: Diagnostic Procedure 1 (1 of 3)

Fig. 20: Diagnostic Procedure 1 (2 of 3)

Fig. 21: Diagnostic Procedure 1 (3 of 3)

DIAGNOSTIC PROCEDURE 2

Fig. 22: Diagnostic Procedure 2 (1 of 2)

Fig. 23: Diagnostic Procedure 2 (2 of 2)

DIAGNOSTIC PROCEDURE 3

Fig. 24: Diagnostic Procedure 3 (1 of 2)

Fig. 25: Diagnostic Procedure 3 (2 of 2)

DIAGNOSTIC PROCEDURE 4

Fig. 26: Diagnostic Procedure 4 (1 of 2)

Fig. 27: Diagnostic Procedure 4 (2 of 2)

DIAGNOSTIC PROCEDURE 5

Fig. 28: Diagnostic Procedure 5 (1 of 2)

Fig. 29: Diagnostic Procedure 5 (2 of 2)

DIAGNOSTIC PROCEDURE 6

Fig. 30: Diagnostic Procedure 6 (1 of 2)

Fig. 31: Diagnostic Procedure 6 (2 of 2)

Fig. 32: DIAGNOSTIC PROCEDURE 7

Fig. 33: DIAGNOSTIC PROCEDURE 8

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ELECTRICAL COMPONENTS INSPECTION

FRONT LIMIT SWITCH AND REAR LIMIT SWITCH

• Pushed
  • Continuity: No
• Released
  • Continuity: Yes

SHOULDER BELT BUCKLE SWITCH

• Move magnet toward buckle switch.
  • Continuity: Yes
• Move magnet away from buckle switch.
  • Continuity: No

DOOR LATCH SWITCH (BUILT IN DOOR LOCK ASSEMBLY)

• Open
  • Continuity: Yes
• Closed
  • Continuity: No

Fig. 34: DRIVE MOTOR ASSEMBLY

LAP BELT BUCKLE SWITCH

• Fastened
  • Continuity: No
• Unfastened
  • Continuity: Yes

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WIRING DIAGRAMS

Fig. 35: Automatic Seat Belt Wiring Diagram (1 of 2) Print For Best Results

Fig. 36: Automatic Seat Belt Wiring Diagram (2 of 2) Print For Best Results






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Nissan 240sx S13

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