Exhibit 12 Operational Description

FCC ID: MRXTG224AM01

Operational Description

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1. Introduction 11 Rapoe ‘hepoeon ofis ecifcadon it retnth mai chuncteriateoheScvater: PndgezoIinenatonalncomorte (SHID RTPMS banriter, T infomation fo the dign oete a tdlon ecive t megrrion wit the vicle Remoe Keyis Ety (RKE ecever 128t09e ‘Thidocument apls t l canomens who wl h dvignig th RTPMS n prtof thir vehcia montoring tm Scrade idgpor will upnly e tre presice trnmiten,The ocever y alto b ul tyBto orm a complet d alowe" «ymo th vebicimauicie may diide on ineprtin wit h vebiclew tE Peeire Thisdocunertdos nt intnd i rennet o iect any bariware orotvare ‘Treimeni only t relyth tmwminio fonma ofh e prowire montoring den. the tre roelt fnctinaltyand thy poms oe REPMS rmuniter 13 Ounic ‘The m has ben devlope o maitoa vehic t rovnres whidoving or matony. An distnnic ui mide ic . tfern toa h RTPMS rmmine) mooned o the vave m poriaicaly mewre nct prevors y memofRF rommunicaionhx posie infomaton is ramntad o a eerverdecode Tre irvive s e n drcod t incoming riintoauene ignlsforat h dn wnater h ds h pespu apey ecadon witi h ticie s equretby h cutmmeriuppler 14 Depaiten ASHC npplicon Spcitc negrted Cvit, Geveity,a conors cvinet intgenet e( menanannt fo a unqu pplain o a pocticconmmer: 1tAcroym for biney it A onof informaton tn ca brepretad by lter logic s 0)ora lope one (0. i mithThe inese to ooe ui t inforaton 80 Mck: tn thisdocunena Nock n refors t n a poupof sight namumined wort or funes (Cck nem: Unaly seven bs o a wort tsipnt the nnhenicty or corccinn of theinfrrmaton) bingsen. Th chack n is vlly compred apun aalainat vis inb fom Custamer: The peio, o prios, who pay forthe prodact and usuly (ot t mesemeiy) deide h requenents AroeRateToeupoo with which td s vernited o ven. onl in is persecond. Preme: One complet rininuian oinformaton t is docement, tame d wort we wan inorsangealyand vefer t h mm hing, Fo hn mesepe, eich hmcontins oneantony e mesage A frame is deincaed by h moframe (G0F) mc eximmmm _/2— Pusl ceor nen e on. veriia 024

L Low Eqsns tastte Ae Batey P9 tul mocinet with s wheot tavuniter uhch indlonest o Jow bateryfanton code ha been se n Prevare Threiolt Pressrs lovs blow wiicha Tow proirs slam salte gesente y the reoier Prouel:A it o comveniothatpovon th nnien ofproceis, devies, and otercompooen witina notem. Aserse: Dvie,rpplie by h cntomerts decadesth RTPMS dand hen comvens th dat io informaton tean be it by e veiear ym 2. tado eguercy ATPMAS—Ramoe TPresre Mooring Sywemn Supplur: Terin,or prion, uho protice rotct i s catomer Sor ofPreme: Th ar of um (80B)mace s sn t uiquly tenty th en of a farme tothecaeot ic PM udsc With Modalato) verion it se ugh n folowndby ow ht Tranntter~"Thedevice tis mooned i h o ht seses h t promur d ‘henaents h informaton in RF t h vaticl reive itr: ie High Euen318 / 390 0tte. Vahice Tvip—Tr poiad daing ahich trell uiisclosd Word: A soquece otis or chaies it in sore, aidrened, ransnited, and eperted oo i sit witin « aven compotr o poconor, A sequenc otis o chncton hihas mcning snis conidat n caly. Witin is docmment, word and rame aecit inerchngoniy

Overall Description 21 Protuct Penpectve 241 Spoem Ineface ‘TheREPMS un is oe part ofie RTPM Syms TheRTPMS rqure on inerticedecodrmcuven 213 B0Dagren See Appentic A"RTPMS Trmmite HockDiigan® 22 Protuct Punctons 221 MPn ‘Te in Ainctom. whch the RTPAAS trsuniter bas t peformare Meniorant tramunit t powoce Deteminaion of mpersire conpennted pemuee vake. Intom tereceveoanylow sw conttn. PDeterine ttre arenimermalpevncsvacuon in ie whect 23 Commriine 221 e7stsoomt0 ‘The 3390 0t verion nent h euements oe Buropein Talecommncatons SundntInxte 100220 replaton Pnivdual couty approvlsnced ob appled foeDividon ofcot benepoinet 242 7CCRepiaton ‘The 318 t vencn ment tb epismensof e PatentCommunicions Commuion repiation Par is ‘Teemironmenal condiion,incluig ESD (dectonatl dicharge. EMC (dectomapnetccompuiili, enpennen, viratondgepe o whch t trniter mu n RTPM be l t wtsaand o deirbe in h "Scinderin Geonc ValtaionSpeifenton" documen. 24 Avemptons ondDepentarci 240 Astm Pat ‘ThenandctSchade ridgpet RTPMS asuiteranit wsing ampliude imadiiio (AM0. An PM verion ca uo be spplod 243 CarirPrepeancy in ie UBn, he trcumimien fequency is 315 Mil. n h Borpesn Communiy,he srmsnision tiequeny i43392 itz

21 Pancions 11.1 OperatonalDocripion "hefnction fh meceve isto dsadethe infrmaton is y h RTPMS wnnsniterand indlowe h pesar t the end in 1t is he responntiltyofhe catometo darniae how h inforato i dapliye h ense and whatTevls oweningsaegiven 5l canhoweveroffe vic in thi ara Th upiy c be in the frm ofa dsploy, blb, uzeoevee voce ns to w thedve ofthe bromalprousns; Dependct o h ie oie vohics ieRTPMS rasniter wl see iatul e con rainitte nformaion i a apcitefomatto therecave. (ee Appenti Schradr RTPMS Proico). TheREPMS onter s a ionnitolydevic ant canatacepiformaton oothr snnoter n fo te "Lea? or RalF npus. The RIPMS innumite wl aheiystrananith ce proars ut in adiion,it wl mt h uncon ot parielrwortond ireunite idenifeaton. The finctow ae Suriosy, Wate, DriveLow butey, LearnRememr, Nomal, Shep and OH(Se neu tecio) 12 PonimiteSytom Motes 13 1 Saronary hade The KTPMS vaniniter may tanont oveaepia iteval while h vcicie i packd, is ontan is c t t Sciader fitoyThe Meck oun wil ueh nommal pesar finco code Th tananinion rewhle uatonay is given in Secion 33 (te ltoAppendic D ismine PuncionTaningThi aionty mode ixied by lt nc nputt th cutom ASIC: The RTPMS rammitr s coider t be in saudonry made f h rollswich has actyatd t ASIC npt (opn roll ns for atleae h durnin oh Sevic Pavad (SnSenicn 22) and h recopnte Jestonevake mode inceptem ctvwion 122 Watemode nc h vohicle h bemin movenen a rllswichathate(clod rllnwican AS1G iputio ctvat t tmcuniter Th e neich ces wih o coomfue acsleaion obtween 2 and 17 Th apst t which h ol ntch clovn varce wit c vebiicy whes woning dirmeer A a pideine ie wil piculybe bevesn 11 and 2k (7 and 20 ma). Por h is ramaminion ater tASIC receivethe ignl h dt Mock wl on tPincton c o Wake mode(u Aprendi 1 2 6 Puncion Code) All h oter dua wl emain comiteowitin h fermatour, 10chec wr). Ts wl cnly e trnunined onc,ater i RTPMS treaine is ben in madnay modeand then "ounksandTh in an xn rmuminion 121 Drveitote "he EPAmt increne iut ofsmnlog nd ranininion when ie whle is mevig l neich cot) Se Sctan 3 for it vloes The rssnitr wll sn in rve made fo apeit ofime Inown w te Sevic Peied at ie weille n t rt ul evicopen) Afer t Sevice e ime h carid ie Hnnunine reven o Satenay Mede

324 tow Banuy Mote Auateyin dvignt e 10 you e 160000 kn (100,000 mteo,ubichver comes in ‘reciri witi the RTPMS ananiter montor t bety evay tm a rownce imeasrementi enA "Lre ty Ancon cote wl h ent when t bater votage wihin h tramente is below » polc evel Under calconttons, th transnite wilremaln activefor atleas2 mort aer th s Low Batuy trmmniinin Daing h 3 nont peid aeter t RF power ut no th promure imeansomentascuny degude in y w Note ht baveryvatge it uncon ofempeatire When aprsuching t ond orte bry it a ow Batwy tnmwninon ruy ocu becaue of ow ambient tempentina at h it isHoweve, on th re e oting, t intemal terprsie in and t baty voge ies atove tefncton ode Oratolt 22 teor Mote Te eceveidocadr l beasle o diangth is en ode ande he trmsmiter TD witin ts memoo‘ t hidenievionpurpores The memorsaton or"kuming"ofth TD coda oe traiminen on theveheles means t h eceiee it sapible oiheingon infommatoncoming fom rsuminen on adcnt velices ‘Ther ars us tpesof.ean Madereoose,depnding on ASIC tpe Magnti ears Aethatin Sictn s When e linput on h amsnizer ASIC in actved t nou Uiemmiedn which fln o ater inputactvation it ceaatn h fraton cade o the "Lown"mote. Whilen ts mode t RIPWS trmenier wl vanmit idta oc0 rames: When the trenancionin eomplaw, ie RTFMS iannite rewrnto h maicnny mode: When t rllnwich cls(e t vohice is moving) ut the eam mde is comple, h raniiter goe im wate moie Not, h arn made inat s igrredunut a rauminton o menorement ity arecolncidon. Once it lea mode,the ell mc inpu is igored t Aspentat) "Tremsponder Leare ctvnion Seltn : when h en np on t tenuniter ASIi actvaind t nes ranumimion wl ce ofa d s LF frame buv,folowed By a 32 D tamminion adserct in Appenti 128 temensie Mote ‘Thiemnadeonly cce ifh prswnr is changing The prowore n t e pevidially mewured n vanamined ataproanintrvl Ge Secion23 t valee) 16 duing y memurement erio, h curenprire unple is ifren by+44 wr(12 0 on th n raneninedpesore lc aremenre willoceur inrmedinaly. Ti rencinne s don t vety thchonge in prowur. Tte posnre hasindent changed,an ntdivona vananinion () wil sewitt re.mcmnre fineincade ce Apponti 10Irt remcnuncylenwur concidenwit o replar tanmitio, h omeaor e precednce and h epar inowninion wl berelact ty thrememr tramsnimion

327 Nomal Premre Nenmalmode i comidre a npedioy made. Durig norma!reting ind atouy (eplcatle) opraion,t ranemite wl sed ut epla‘y achesuie pesnce dine mt wit each wher e w oflt ofeen Unle/o Wike Low BaterLeam, o emesur modealMock dun Areintininswilcontin ts fncton codefr Nomal Promue. Note, h tanimitr doe atmatethe decion ot ow provsre 420 Sogp hode Steep modeis low ow madediring aneniterstvnion. Ieccu i t time pent bevwerntrensmisian in memoremens 129 ofiese ‘hi e a mitmen powe mode. munly un o aipmenand sorags ofthe EPS trmeniter uane Notal in wil e stippe in is mote. During e Gmode, linemaleimunry iied "o xt e Omatestha th l o l wl cntnunal fo ow wecnda mt t rasoniermo tom modo 1t Offmade isindvoret etere, h eavamiter wile onecondHock ofeighttomes ofOfcadeand hn thtanunitrwilgooconplely, Ti rmade should onl b enty Sctraer Aidgmon penosnet


Document Created: 2000-01-08 11:01:49
Document Modified: 2000-01-08 11:01:49
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