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Seat Belts - Automatic Buick Regal III

Restraints Control Systems 1 illustration ~740 words

DESCRIPTION & OPERATION

The purpose of the automatic seat belt system is to allow doors to be opened without interference from the safety belt. Under normal operation, safety belt retractors prevent belt from being extended. When door is opened, or door handle switch is operated, associated switch is closed. The passive restraint control module receives this signal from the switch(es), and will energize all solenoids. When solenoids are energized, safety belts can be extended without interference.

When the door is closed, the associated latch switch closes, and the passive restraint control module de-energizes solenoids. After a three second delay, belts return to normal operation.

SYSTEM CHECK

  1. With LH front seat belt buckled, open LH front door. Lap and shoulder belt should extend smoothly, allowing door to open freely.
  2. While sitting in driver's seat, close door. Lap and shoulder belts should retract smoothly to fit driver.
  3. Repeat above steps for RH front. Results should be similar.

If seat belts prevent one door from opening freely, see procedures in BELT SOLENOID TEST under TESTING. If seat belt system does not operate properly, see PASSIVE RESTRAINT CONTROL MODULE TEST under TESTING.

PASSIVE RESTRAINT CONTROL MODULE TEST

  1. Disconnect passive restraint control module connector. Open LH front door. Measure voltage from connector pin 1 (Orange wire) to ground. If battery voltage is present, go to next step. If battery voltage is not present, repair open in Orange wire between 10 Amp ELEC fuse and module connector pin 1.
  2. Measure voltage from connector pin 1 (Orange wire) to pin 5 (Black wire). If battery voltage is present, go to next step. If battery voltage is not present, repair open in Black wire between ground, (on RH side of engine, or LH front of engine below exhaust), and module connector pin 5.
  3. Measure voltage from connector pin 1 (Orange wire) to pin 3 (Yellow wire). If battery voltage is present, go to next step. If battery voltage is not present, repair open in Yellow wire between module connector pin 3 and solenoids. See «WIRING DIAGRAMS»(/buick/regal/iii-1988-1997/remont/restraints-control-systems/#seat-belts-automatic) . If wire is okay, check Black wire for open between solenoids and ground (LH side of engine, below exhaust manifold). See «WIRING DIAGRAMS»(/buick/regal/iii-1988-1997/remont/restraints-control-systems/#seat-belts-automatic) .
  4. Measure voltage from connector pin 4 (Dark Blue/White wire) to ground. Battery voltage should be present. If voltage is as specified, go to next step. If voltage is not as specified, check door latch switch or Dark Blue/White wire (between module connector pin 4 and door latch switch) for open. See «WIRING DIAGRAMS»(/buick/regal/iii-1988-1997/remont/restraints-control-systems/#seat-belts-automatic) .
  5. Close LH front door. Measure voltage from connector pin 4 (Dark Blue/White wire) to ground. Voltage should be 0 Volts. If voltage is as specified, go to next step. If voltage is greater than 0 Volts, check door latch switch and Dark Blue/White wire for short to power. See «WIRING DIAGRAMS»(/buick/regal/iii-1988-1997/remont/restraints-control-systems/#seat-belts-automatic) .
  6. With LH front door closed and RH front door open, measure voltage from connector pin 4 (Dark Blue/White wire) to ground. Battery voltage should be present. If voltage is as specified, go to next step. If voltage is not as specified, check door latch switch or Dark Blue/White wire (between module connector pin 4 and door latch switch) for open. See «WIRING DIAGRAMS»(/buick/regal/iii-1988-1997/remont/restraints-control-systems/#seat-belts-automatic) .
  7. Close RH front door. Measure voltage from connector pin 4 (Dark Blue/White wire) to ground. Voltage should be 0 Volts. If voltage is as specified, go to next step. If voltage is greater than 0 Volts, check door latch switch and Dark Blue/White wire for short to power. See «WIRING DIAGRAMS»(/buick/regal/iii-1988-1997/remont/restraints-control-systems/#seat-belts-automatic) .
  8. Check Yellow wire for short to ground or poor connection. If wire and connection are okay, replace passive restraint control module.

BELT SOLENOID TEST

  1. Disconnect suspect belt solenoid connector. Open either front door. Measure voltage between solenoid connector (Yellow wire) and ground. Battery voltage should be present. If voltage is as specified, go to next step. If voltage is not as specified, check Yellow wire for open between solenoid and passive restraint control module, pin 3.
  2. Measure voltage between solenoid connector terminals (Yellow and Black wires). Battery voltage should be present. If voltage is not as specified, check Black wire for open between solenoid connector and ground (LH side of engine, below exhaust manifold). If voltage is as specified, check for poor connection. If connection is okay, replace solenoid.

Automatic Seat Belt Wiring Diagram. Scheme 1

Scheme 1: Automatic Seat Belt Wiring Diagram
Scheme 1: Automatic Seat Belt Wiring Diagram