Attachment V - Technical Instruct. (System Diagnosis)
SUPPLEMENTAL DIAGNOSTIC GUIDETABLE OF CONTENTS
^ I. Symptom Chart----------------------------------- Pg. 1
^ II. Description And Operation----------------------- Pg. 2-4
^ III. Electrical Schematic------------------------------- Pg. 5-7
^ IV. Passive Restraint Module Pin Out--------------- Pg. 8-9
^ V. Diagnostic And Testing (PR Tests)------------- Pg. 10-22
^ VI. Fuel Pump Inertia Switch------------------------ Pg. 23-27
Technical Service Bulletin (90-26-02)
Symptom Chart
Probe Seat Belts
Description And Operation
The passive restraint system controls the operation of the belt carrier.
The seat lap belts are to be manually connected by the driver/passenger and should always be worn.
After entering the vehicle and closing the door, place the ignition key to the ON position. The shoulder belt carrier is moved from the A-pillar (OFF position) to the B-pillar (ON position). At the same time, the BELTS warning indicator lamp and chime are on for four to eight seconds or until the shoulder belt is latched.
The shoulder belt automatically adjusts to allow comfort and freedom of movement. It locks tight during extremely hard braking, or impacts of 3 km/h (5 mph) or more.
When the door is opened, regardless of the ignition key position, the shoulder belt carrier moves from ON to OFF position, provided the inertia switch contacts are open.
WARNING
PLACE THE LAP BELT SNUGLY AND AS LOW AS POSSIBLE ABOUT THE HIPS, NOT ABOUT THE WAIST. FAILURE TO DO SO MAY INCREASE THE CHANCE OF INJURY IN THE EVENT OF A COLLISION.
WARNING
FRONT SEAT OCCUPANTS (INCLUDING PREGNANT WOMEN) SHOULD WEAR THE LAP BELTS IN ADDITION TO THE SHOULDER BELTS FOR OPTIMUM PROTECTION. REAR SEAT OCCUPANTS (INCLUDING PREGNANT WOMEN) SHOULD ALSO WEAR THE LAP BELTS IN ADDITION TO THE SHOULDER BELTS FOR OPTIMUM PROTECTION.
If the lap or shoulder belt retractor jams, free the belt by doing the following:
^ Pull on the belt with both hands to tighten it on the retractor spool.
^ Feed the belt back into the retractor until it is completely retracted. Repeat the previous step, if necessary.
^ Pull the belt out of the retractor as far as it will go. Remove any foreign matter or untwist the belt, as necessary, and let the belt retract.
^ Extend and retract the belt about five times to ensure the belt retractor operates properly.
Control Module
The following description applies to the operation of the passive restraint system. The chart indicates the system inputs and pins necessary for application to the driver's and passenger's side of the system.
SYSTEM INPUT DRIVER'S SIDE PIN NUMBER PASSENGER'S SIDE PIN NUMBER
Door 2D 2N
B-Pillar Limit Switch 1E 2O
A-Pillar Limit Switch 1F 2K
Motor Leads 1J & 1H 2J & 2H
Motor Leads 1L or 1K 2l & 2M
Retractor Switch 2B 1O
Conditions To Move Buckle Carrier From The A-Pillar To The B-Pillar
To move the buckle carrier from the A-pillar to the B-pillar when the door is closed (pin 2D floating/not-grounded), and the ignition key is in the ON position (pin 2C high), the passive restraint module will check the B-pillar limit switch (pin 1E).
If the B-pillar limit switch is not activated (pin 1E floating/not grounded), the passive restraint module will apply power to the driver motor. This will send the buckle carrier from the A-pillar to the B-pillar (pins 1L & 1K high, pins 1J & 1H grounded), until the B-pillar limit switch is activated (pin 1E grounded).
If the B-pillar limit switch is activated (pin 1E grounded), no action will occur.
Conditions To Move The Buckle Carrier From The B-Pillar To The A-Pillar
To move the buckle carrier from the B-pillar to the A-pillar when the door is opened (pin 2D grounded), and the inertia switch is set (pin 2F floating), the passive restraint module will check the A-pillar limit switch (pin 1F).
If the A-pillar limit switch is not activated (pin 1F floating), the passive restraint module will apply power to the driver motor. This will send the buckle carrier from the B-pillar to the A-pillar (pins 1J & 1H high, pins 1L & 1K grounded), until the A-pillar limit switch is activated (pin 1F grounded).
If the A-pillar limit switch is activated (pin 1F grounded), or the inertia switch is tripped (pin 2F grounded), no action will occur.
Conditions To Activate The Seat Belt Light
When the passive restraint module determines a seat belt warning is required, the fasten seat belt indicator output (pin 1M), supplies a ground to the Fasten Belt Indicator (FBI). This action activates the seat belt light.
When the ignition key is in the ON position (pin 2C high), and both of the B-pillar limit switches are not activated (pin 1E or 2O floating/not grounded), the FBI output is activated (pin 1M grounded).
The FBI is also activated when the ignition key is in the ON position (pin 2C high), and either of the shoulder belts are spooled in (pin 2B or 1O floating/not-grounded).
WARNING
THE WARNING CHIME MODULE INTERFACES WITH THE WARNING LIGHT.
Conditions To Activate The Warning Chime
When the passive restraint module determines that a warning is required, the audible chime output (pin 1N) supplies a ground to the warning chime module.
When the ignition key is in the ON position (pin 2C high), and either shoulder belt is spooled in (pin 2B or 1O floating/not grounded), the chime output is activated (pin 1N grounded) for five seconds. If this output has been triggered and timed out, it can be triggered again by spooling in the other shoulder belt (floating/grounding pin 2B or 1O).
Passive Restraint System
Passive Restraint System
Passive Restraint System Connectors
Probe Passive Restraint Module Pin Out
Grey Connector 315-1
Probe Passive Restraint Module Pin Out
Black Connector 315-2
Diagnosis And Testing