TECHNICAL SERVICE BULLETIN BRITISH Austin MG LEVLAND. NO. SUBJECT: Preliminary Information 1974 Vehicle Seat Belt Interlock System MODELS: MGB, MGB GT, MG MIOGET AUSTIN f..farina NOTE: There is a time delay feature incorporated into the sat belt interlock system. This feature will allow the starter to be operated under any seat belt conditions (fastened or unfatened) after the driver's seat has been vacated. Therefore, it is necessary to have the engin shut off and the driver's seat vacated for three minutes prior to performing the following test procedure. OPERATIONAL TEST PROCEDURE OF PEKTRON SEAT BELT INTERLOCK SYSTEM 1. Sit on driver's seat with belt unlatched, door closed and transmission in neutral. 2. Turn ignition switch to start position. Starter should not operate, seat belt warning light and buzzer should operate. 3. With ignition switch in "on" position (Pos.II), put transmission in a ny gear. Seqt belt warning light and buzzer should operate. 4. Latch driver's seat belt, put transmission in neutral, prs firmly on passenger's seat cushion. Starter should not operate and warning buzzer and light should operate until th key is released. 5. With driver's belt still latched, transmission in neutral, operate the starter switch, starter should operate, seat belt warning light and buzzer should not operate. 6. With transmission in any gear, press passenger'$ seat cushion. Warning light and buzzer should operate. 5. With driver's belt still latched, transmission in neutral, operate the strter switch, starter should operate, seat belt warning light and buzzer should not operate. 6. With transmission in any gear, press passenger'$ seat cushion. Warning light and buzzer should operate.
PEKTRON SEAT 'BELT INTERLOCK SYSTEM The Pektron s eat belt i nterloc k system is designed t o act as a seat bel t wa r n i n g and prevent engine start if the sitbucklestart s e q uence i s no t followed. It will a lso give a visual and audibl e wa r n i n g i f t he t ransmission is placed in a forward gear, and the drive r o r passenger do not h a v e their seat belts fastened. START PREVENT I ON The engine start ing system will not operate if eithr a) The s e a t e d driver does not "h a v e the drivr's seat belt i n u s e. b ) The seate d p a s s e nge r does not have the passenger's seat belt in use. The engine s t arting system wi l l operate ONLY if the following conditions hav e be e n met : a) The d r iver must sit a nd subsequently buckle his or' her s e a t belt. b) A passe ng e r mu s t sit a nd subsequent ly buckle his or her s e a t b e l t. c ) The s t o pped e ng ine may be r estarted without restriction from the s e a t be l t i nterl o ck p r ov i d e d the driver has not l eft the d r i v e r ' s seat or in the e v e n t of an engine s t all, the i g n i tion switch has not been switiched. to OFF. The seat bel t int erl o c k system will not affect the vehicle...... _.L ": _... "L...1.. 1-..:.:.: '-.:.:,.....,.""".."...... ".t= PE KTRON SEAT 'BELT INTE RLOCK SYSTEM Th e Pektr o n s eat belt i n t e r l o c k s y s tem is desi gn e d t o act as a seat bel t warning a n d prevent engine start if the sitbucklestar t s e q uence 15 no t f ollowe d. It will a lso give a visual and audibl e, a r n i n g if the tran s mi s s ion is placed in a forward
module. Remova l of t h e module from the system will prevent operation of th rstarting system. TESTING GUIDE FOR PEKTRON SEAT BELT INTERLOCK CONTROL UNIT The seat belt interlock system is made up of a control unit and associated switches. In the event of a malfunction, it will first be. necessary to determine if the fault lies in the automobile wiring and switches or within the corrtro-l uni. The' s.i.mple s t; method of determing a malfuncation in the contrql unit is by substitution with a new one. IMPORTANT -- Check swit.ches and wiring first to avoid damaging: a new control unit if circuit faults are present Test Equipment for Switches a nd Wiring 1. 12 volt 2.2 watt lamp with flying leads 6" long fitted with insulated 3 mm sockets for connection tc? the pins of the plug in the vehicle harness wh i.ch connects with the control unit. (Th e specified lamp ratng should not be exceded to prevent overloading of the switches.) 2. A, six inch piece of insulated wire with bare ends. operation of th rstarting system. TESTING GUIDE FOR PEKTRON SEAT BELT INTERLOCK CONTROL UNIT The seat belt interlock. system is made up of a control unit
TEST PROCEDURES FOR SWITCHES AND WIRING The following checks should be made with reference tq pt identification numbers as shown in the sketch below: IIIJJ I<Z'fS ;? J(j) @ l 81I> @@) TEST PROCEDURES FOR SWITCHES AND WIRING The following checks should be made with reference tq pt identification nuiribers as shown in the sketch below:
.' TEST PROCEDURES CONNECT \. I TEST LAMP LAMP FAULT PROCEDURE. Power Check Pin 2-5 ON I f not, check f use Driver's Belt S\"1itch Pin 2-11 ON (Unfas;tened) I f not, check l i n e - f u s e OFF (Fastened) wiring and switch Driver's Seat Switch Pin 5-10 ON (Seated) If not, check line-fuse OFF (Not seated) wir ing and switch Passen<;Ier Belt Switch Pin 2-9 ON (Unfast ened) If not, check lin e - fus e OFF (Fastened) wiri n g a nd sw i tch Pa s s e ng e r Seat Switch Pin 5-12 ON (Seated) If not, check line-fuse OFF (Not seated) wiri ng and s witch Transmission Switch Pin 4-5 ON ' (In gear) I f not, check f u s e (Ignition On) OFF (Neutral) wiring and switch',,.. ' r t Switch Pin 1-5 ON (At "StartIt) I f not, check wiring OFF ("'Ign" or "Off" ) and s wi t c h THE FOLLOWING CHECKS ARE MADE SUBSTITUTING THE WIRE FOR THE LAMP: CONNECT TEST WIRE LAMP FAULT PROCEDURE Start Relay ' Pin 2-3 Starting Motor If not, c heck r e l a y, Operates switch a n d wiring I Vehicle Warning Lamp Pin, 5-6 Vehicle Warning Lamp. If not, c heck b u l b ON f u s e and wiring - Power Check Pin 2-5 ON I f not, check f use Driver's Belt Switch Pin 2-1 1 ON (Unfas;tened) If not, check l i n e - f u s e OFF (Fastened) wiring. and switch Driver's Seat Switch Pin 5-10 ON (Seated) If not, check l ine - f us e OFF (Not seated) wir ing and switch
Cont GET 2-, JI,. -..----- - - - _._.' 1 ---:,.('4-.-- Control 'unit ±s located o Bu l khe a d in Glove Box COMPONET LOCATIONS MG MIDGET
. " '. +. """'1 C21 CI yk 'A.', STATE REL.AY.-....SA FUSE p -I i ell. I. G.. Z "0 l U I rr!:i 1" (Jl b o.lti r.....,.i r- 0 I o, B ATTERV' c. Ul r--; r..." t (J1 m 'l o I I ' 0 f v (. Dc. ( r ( G t + 8 P-... C2 DIAGRAM.3 S,,8 G5 2. 7... 1 10 WIRING DIAGRAM. SYSTEM PEC'l'RON SYSTEM N!MG ON<' V/V,'- AUSTIN!MG...;1 I )! { p---------
QUESTIONS THAT MAY ARISE ABOUT THE SYSTEM - AND THE ANSWERS TO THEM Q - What i f one places a fairly heavy package on the passenger front seat? A - The seat belt has to be fastened to start the engine or the package may be placed on the floor. Q - Does the driver have to get in before the front seat passenger? A" - No. So long as the driver and passenger have observed the startin g sequence and are both buckled in before the key is turned to start. Q - If the engine stalls, will one have to go through the sequence again? A. No. The engine can be restarted as long as the driver and front seat passenger remain seated. Q - Suppose the driver or passenger raises himself off the seat in reaching f o r change at a toll booth. Will the engine stop? A - No. Rais ing oneself off the seat will have no effect during all d r iving conditions. Q - What h a ppens if the seat belts are left fastened at all times? Q - What i f one piaces a fairly heavy package on the passenger front seat? A - The seat belt has to be fastened to start the engine or the package may be placed on the floor.
Q - Suppose something goes wrong with the system; how can I start the car? A - The chanc of something goin wrong with the system is remote; but if it should happen the engine can be started by reaching into the car to turn the key -- without putting any weight on the front seat. Be sure, of course, that the transmission gear selector.is out of gear and the hand brake is applied. A - The chanc of something goin wrong with the system is remote; but if it should happen, the engine can be started by reaching into the car to turn the key -- without putting any weight on the front seat. Be sure, of course, that the transmlssion gear selector.i s out of gear and the hand