2006 LAND ROVER FRELANDER 2 sensor

The cabin te mpe rature s ensor comprises a NTC thermist or a nd a motor. The sensor is mounted behind a grill on the driverss ide of the instrume nt panel , adjace nt t he s teering column.
• NO TE: The cabin te mperat ure sens or i s only fi tted to vehi cles with a dual zone, a utomati c cli mat e control system.
The motor is provide d an ele ctrical f eed from the ATC module and draws ca bin a ir in through the grill a nd over the thermis tor.The t hermist or re ceives a 5 V re fere nce feed from the ATC module. By moni toring the re turned volt age, the ATC modul e ca ncalculate air tempera ture wit hin the cabin.
CABIN HUMIDITY SENSOR
The cabin humidity s ens or is located wit hin the inte rior mirror a nd comprise s 3 individual el eme nts :
A humidit y se nsorAn ai r temperature se nsorA windshi eld glas s te mpe rature s ens or.
• NO TE: The cabin humidity sens or i s an opt iona l fit onl y.
The readings from these 3 s ensors combine to reduce the ri sk of mi sting on the windshield.
The humidity sensor element is cont aine d behind a nylon mesh cove r. The s ens or comprise s an ele ment made up of fil mcapa citors on dif fere nt s ubst rate s. The diele ctric is a polyme r which abs orbs or rele ases wa ter proportional to t he humidity oft he a ir being dra wn t hrough the sensor. This causes a change in the capacit ance of the sensor.
Humidity wit hin the cabi n is controll ed by ra ising or lowering the te mpe rature of the evaporator. An increas e in eva poratort emperat ure increase s the moist ure cont ent of t he a ir in the cabin. Lowering the evaporator tempe rature re duces t he mois tureconte nt of the ai r in the cabin.
The capa cita nce of t he s ensor, t oget her with both te mperat ure values, are provided as LIN bus me ssages t o the ATC module.The ATC module use s these signals to calculate the dew point of the ai r at the windshi eld. W hen t he t emperat ure of t hewindshie ld glass rea ches or falls bel ow t his value, misti ng i s likely to occur. In this inst ance, the ATC module will;
ra ise the tempera ture of the air l eaving t he heat er a ssemblya djus t the position of the windshield dis tribution (de fros t) s tepper motora djus t the position of the air inta ke stepper mot orre duce A/C compress or di spla cement (i6 only)powe r the windshield hea ter element s (if fitt ed).
AMBIENT AIR TEMPERATURE SENSOR

The a mbient air tempera ture sensor is a NTC thermi stor, and is mounte d in the LH door mi rror. The sensor rece ives a 5 Vreference fee d from the ECM. By monitoring the returned voltage, the ECM can calculate the res ista nce of t he s ens or a ndhence ambie nt a ir te mpe rature. The ECM tra nsmits an a mbi ent air t emperat ure value over t he high spe ed CAN bus . This va luei s rel aye d to the ATC module by the CJB ove r the medium s peed CAN bus.
SUNLOAD SENSOR
The s unl oad sensor i s mount ed i n the ce nte r of the inst rument pane l upper surf ace . The se nsor contains a photoel ectric ce ll,which provides the CJB with an i nput of light int ensi ty e qua ting to t he s olar hea ting eff ect on t he cabin.
The s ola r he ating va lue is transmitte d from the CJB to t he ATC module ove r the me dium speed CAN bus. The ATC modulecompens ates for the sola r he ating e ffect by adjusting blowe r speed, air out put tempera ture and air dis tribution to mai ntai nt he requi red cabi n te mpe rature.
POLLUTION SENSOR

The pollution sensor allows the ATC module to monitor inta ke a ir for the level of carbon monoxide (CO ) and oxides of nitrogen(NOx). The s ensor is mounte d on the RH side of the hea ter casi ng.
• NO TE: The poll ution se nsor is an optional fit on ve hicl es with a dual z one , automatic climate control syst em.
The pollution sensor is provi ded an i gnit ion cont rolle d fe ed from the Ba ttery Junction Box (BJB) and provide s one of thef ollowing 4 s igna ls t o the ATC module based on ambient air qua lity:
Static or reduced poll ution le velsSmall increas e in poll ution le velsMedium incre ase in pollut ion leve lsRapid or l arge increas e in pol lution le vels .
Base d on the signal from the polluti on s ens or, t he ATC module is a ble t o control the intake air source to re duce the amount ofconta minant s entering the cabin. This functi on i s fully a utomati c, but ca n be overridden by manual sele ction of the air inta kes ource us ing the fres h/re circulat ed a ir switch on the control panel.
CONTROL DIAGRAM
• NO TE: A = Hardwired; D = High Speed CAN bus; N = Medium Spe ed CAN bus ; O = LIN bus

Ite mPart NumberDescription1-Bat tery2-Blower mot or3-LH tempera ture ble nd stepper mot or4-W i ndshield dis tribution (de fros t) s tepper motor5-Pol lution s ensor6-Cabin humidity sensor7-Air inta ke s tepper mot or8-RH temperature ble nd stepper mot or9-Face/fe et distribut ion s tepper mot or10-Ambient ai r tempe rature s ensor11-A/C compre ssor solenoid - i6 only12-ECT se nsor13-Ref rige rant pre ssure se nsor

14-Cabin t empera ture sensor15-Eva porator temperature se nsor16-ECM17-ATC modul e18-Fus e 27, CJB19-Blower mot or control module20-Sunloa d se nsor21-Fus ible link 17, BJB
PRINCIPLES OF OPERATION
Intake Air Control - Single Zone Manual System
The i ntake a ir source is cont rolle d manually by press ing the fres h/re circulat ed a ir switch located on the control panel. W he npress ed, the ATC module wil l illuminate the swi tch t ell-tale Light Emitti ng Diode (LED) and clos e the a ir intake door. A secondpress of the swit ch will caus e the ATC module to extinguish the swi tch LED and ope n the a ir intake door, a llowing fres h ai r toe nte r the cabin.
• NO TE: The ATC module wil l reduce the amount of fres h ai r ent ering the ca bin to reduce the ra m e ffect ca used by forwardmoti on of the ve hicle .
W he n recirculate d ai r is sele cted, the ATC module will re turn the air int ake door to the ope n position a fter a pe riod of 3minutes. Thi s he lps prevent mis ting within t he cabin. The 3 minute time pe riod for reci rcula ted air can be overridde n bypress ing and hol ding the fre sh/re circulat ed a ir s witch until t he s witch LED fl ashes 3 times. The air inta ke door will now remainclose d until t he next drive cycle.
The ATC module controls the pos ition of the air inta ke door by providing LIN bus messa ges to t he a ir intake door s teppermotor. A Hal l eff ect sens or l ocat ed withi n the st epper motor inf orms the ATC module that move me nt of the ste ppe r motor ist aking pl ace.
Intake Air Control - Dual Zone Automatic System
The i ntake a ir source is cont rolle d automatically unl ess overridden by press ing the fresh/recirculate d ai r switch loca ted on thecontrol pane l. Under aut oma tic control, t he ATC module det ermi nes the require d position of the air inta ke door usi ng it s'comfort' algorithm based on inputs from the ambient ai r tempe rature s ensor and the ca bin temperature se nsor.
W he n the ve hicle firs t enters power mode 6 (ignition on), the te ll-ta le LED on t he fresh/recirculated air swi tch will bei lluminat ed a nd t he air intake source wil l be aut oma tica lly controlle d by the ATC modul e. The ATC module will cont rol t hei ntake ai r source accordi ng t o ambie nt a ir te mpe rature a nd requeste d ca bin temperature. The intake ai r door will be opene d toa llow fre sh a ir into t he cabin, alt hough a small a mount of re circulat ed a ir will a lso be prese nt.
• NO TE: The ATC module wil l reduce the amount of fres h ai r ent ering the ca bin to reduce the ra m e ffect ca used by forwardmoti on of the ve hicle .
A single pres s of the fres h/re circulat ed a ir s witch wi ll extinguish the tel l-tal e LED. The ATC module will now close t he a iri ntake door a nd provide only recircul ated air into the cabin f or a period of 3 minutes . Af ter this peri od, the ATC module wil lreturn the ai r int ake door to automa tic control. This helps preve nt misti ng withi n the ca bin.
A second pre ss of the fre sh/recircula ted air s wit ch will a lso return the intake air source to a utomati c control and ill uminate thet ell-t ale LED.
The 3 mi nute time period for recircul ated air can be ove rridden by press ing and holding the fres h/re circulate d a ir switch untilt he s witch LED fl ashes 3 times. The air inta ke door will now remain clos ed unti l the next drive cycle .
The ATC module controls the pos ition of the air inta ke door by providing LIN bus messa ges to t he a ir intake door s teppermotor. A Hal l eff ect sens or l ocat ed withi n the st epper motor inf orms the ATC module that move me nt of the ste ppe r motor ist aking pl ace.
Intake Air Control - Dual Zone Automatic System with Pollution Sensor
The i ntake a ir source is cont rolle d automatically unl ess overridden by press ing the fresh/recirculate d ai r switch loca ted on thecontrol pane l. Under aut oma tic control, t he ATC module det ermi nes the require d position of the air inta ke door usi ng it s'comfort' algorithm based on inputs from the ambient ai r tempe rature s ensor, t he cabin temperature se nsor and the pollut ions ens or.
• NO TE: The ATC module wil l reduce the amount of fres h ai r ent ering the ca bin to reduce the ra m e ffect ca used by forwardmoti on of the ve hicle .
W he n the ve hicle firs t enters power mode 6 (ignition on), the 'AUTO ' te ll-ta le LED on the fresh/reci rcul ated air swit ch will bei lluminat ed a nd t he air intake source wil l be aut oma tica lly controlle d by the ATC modul e. A single pres s of thef resh/recircul ated air swi tch will exti ngui sh t he 'AUTO' te ll-t ale LED and illumina te t he 'MAN' te ll-ta le LED. The ATC modulewill now clos e the ai r int ake door and provide only recirculat ed a ir into t he cabi n for a period of 3 minutes. Afte r this period,t he ATC module will return t he a ir intake door to automatic cont rol. This he lps prevent mist ing within t he cabin.
A second pre ss of the fre sh/recircula ted air s wit ch will e xtinguis h both t he 'AUTO' a nd 'MAN' tel l-ta le LED's . The ATC modulewill now cont rol the inta ke a ir source according t o a mbie nt a ir te mperat ure and request ed cabin tempe rature. The a ir intakedoor will be opened to a llow fres h a ir int o the ca bin, but a s mal l amount of reci rcul ated air will also be pre sent . The amountof re circulate d ai r is dete rmi ned by t he ATC module using it s 'comfort' a lgorithm based on i nputs from the ambient airt emperat ure sensor and the cabi n te mpe rature s ens or.
A thi rd press of t he f resh/recirculate d ai r switch returns the air i ntake s ource to aut oma tic cont rol a nd will illumina te the'AUTO' te ll-ta le LED.
The 3 mi nute time period for recircul ated air can be ove rridden by press ing and holding the fres h/re circulate d a ir switch untilt he s witch LED's flas h 3 time s. The air intake door will now remain clos ed until the next dri ve cycle .
The ATC module controls the pos ition of the air inta ke door by providing LIN bus messa ges to t he a ir intake door s tepper

a utomati c control.
Air distri buti on can be re turned t o automatic control by pres sing the 'AUTO' swi tch loca ted in the ce nte r of the blower motorrotary controller. Thi s wi ll ill uminate the 'AUTO' LED and allow t he ATC module to control a ir di stribution in line wit h it s'comfort' algorithm
Air distri buti on is control led by 2 air dist ribution doors. The ATC module control s the position of the air dis tribution doors byprovi ding LIN bus me ssa ges to t he door ste pper motors . Ha ll ef fect sensors located wit hin the stepper mot ors inform t he ATCmodule t hat moveme nt of the st epper motors is taking place.
ECON - Single Zone Manual System
P ress ing the 'ECO N' moment ary swit ch on the control pa nel will swi tch off t he A/C s yste m. W he n s elected, the ATC modulewill t rans mit a mess age ove r the high speed CAN bus to the ECM re que sting the A/C compressor is dis able d. The ECMdisables the compres sor by de-e nergizing the A/C compress or control re lay loca ted in the BJB. The tell-tale LED in the swit chwill i lluminat e to ale rt the ve hicl e occupants tha t the system is in 'ECO N' mode .
W he n 'ECON' mode i s se lect ed, tempera ture control is s till a vai lable but no cooling of i ntake ai r wi ll ta ke place . The minimumoutput a ir te mpe rature f rom the sys tem will be ambient air tempera ture plus any heat pick up in the ai r int ake pat h.
A/C can be s witched back on by pres sing the 'ECON' swi tch a se cond time. This will als o extinguish the 'ECON' LED.
Stop/Sta rt Ve hicl es - From 2010 MY
From 2010 MY , t he 'ECON' switch wi ll be labeled ‘A/C’ to pre vent confus ion with the ‘Eco’ switch which operates the‘Stop/Sta rt’ a nd 'Gea r Change Indica tor' syst ems .For a ddit iona l inf ormation, re fer to: Starting Sys tem (303-06C Start ing Syst em - TD4 2.2L Diese l, Vehicles Buil t From:01-03-2009, Des cript ion and Ope rati on).
ECON - Dual Zone Automatic System
P ress ing the 'ECO N/O FF' momentary swi tch in the control pa nel will swi tch off t he A/C s yste m. W he n s elected, the ATCmodule will t rans mit a mess age ove r the high speed CAN bus to the ECM re que sting the A/C compress or is dis able d. The ECMdisables the compres sor by de-e nergizing the A/C compress or control re lay loca ted in the BJB. The 'ECO N' t ell-tale LED in t hes witch will il lumi nate to alert the ve hicle occupa nts that the sys tem is i n 'ECON' mode.
W he n 'ECON' mode i s se lect ed, tempera ture control is s till a vai lable but no cooling of i ntake ai r wi ll ta ke place . The minimumoutput a ir te mpe rature f rom the sys tem will be ambient air tempera ture plus any heat pick up in the ai r int ake pat h.
A second pre ss of the 'ECON/OFF' switch wil l ext inguish the 'ECO N' LED and illuminate the 'OFF' LED. W hen in 'OFF' mode t heATC module sets the blower mot or s pee d to 0. Air distri buti on i nto the cabi n wi ll remai n as pre viously sele cted. Al l LED's ont he control pane l wil l be ext inguishe d, a lthough night ti me illumina tion will remain acti ve.
• NO TE: W he n in 'OFF' mode , the he ated se at, heat ed windshie ld a nd heat ed rear window functions wi ll st ill be availa ble.
A thi rd press of t he 'ECO N/O FF' s wit ch re turns the s yste m to norma l (A/C) operation and extinguishes t he 'OFF' LED. Thes yste m can be re turned to a utomati c operat ion at a ny t ime by press ing the 'AUTO' swit ch mounted in t he cent ral (blowermotor) rotary control ler.
Stop/Sta rt Ve hicl es - From 2010 MY
From 2010 MY , t he 'ECON' switch wi ll be labeled ‘A/C’ to pre vent confus ion with the ‘Eco’ switch which operates the‘Stop/Sta rt’ a nd 'Gea r Change Indica tor' syst ems .For a ddit iona l inf ormation, re fer to: Starting Sys tem (303-06C Start ing Syst em - TD4 2.2L Diese l, Vehicles Buil t From:01-03-2009, Des cript ion and Ope rati on).
Programmed Defrost
The programmed def rost function is only ava ilable on ve hicl es fi tted wit h a dua l zone heati ng, vent ilat ion a nd A/C syst em.The f unction is s elected by press ing the 'PRO G' moment ary swit ch on the control pa nel. W hen s ele cted, the ATC moduleprovi des maximum winds hie ld de fros ting/de mist ing by confi guri ng t he s yste m a s follows:
'AUTO ' mode offIntake air set to fres h airAir di stribution se t to windshieldBlowe r motor spe ed s et t o maximumHeate d winds hiel d onRear window hea ter on.
W he n progra mmed defrost is sel ecte d, t he s et t emperat ure will remain unchanged. Programme d de fros t ca n be cancell ed bya ny of the following met hods:
P ress ing any air distribut ion moment ary swit chP ress ing the 'AUTO' s witch locate d in the center of t he blowe r motor rot ary cont rolle rP ress ing the 'PRO G' momenta ry s witch a second time .
• NO TE: Blower motor speed can be adjuste d wi thout te rmi nating programmed defrost.
Windshield Heater
The windshie ld heate r comprises 2 heate r el eme nts , LH and RH, bonded be twee n the glass laminat ions . The s yste m iss witched on by press ing the momentary swi tch l ocat ed on t he control panel . W hen selected, the ATC module t rans mits aheat ing request on t he high spe ed CAN bus to t he CJB. On rece ipt of the messa ge, the CJB ene rgiz es t he windshie ld heate rrelay loca ted in t he BJB by provi ding a ground path for t he relay coi l. The energized rela y provides a ba ttery fe ed t o bothheat er el eme nts . Aft er a period of 4 minutes the ATC module re moves t he request for windshie ld heati ng. The CJB the npowe rs down the windshield hea ter by re moving the ground pat h for the rel ay coil.
The ATC module will only reques t wi ndshield he ater ope rati on if the engine is runni ng. An e ngi ne s tatus si gnal is provi ded tot he ATC module by t he ECM over the high speed CAN bus.

Rear Window Heater
The rear window hea ter comprise s a single heat er e leme nt bonded to the inner surf ace of t he glass . The syste m is swi tche don by pre ssing the mome nta ry s witch locate d on the control panel. W he n se lected, the ATC module tra nsmits a he atingreque st on the high spee d CAN bus to the CJB. On recei pt of the me ssa ge, the CJB energiz es t he rear window hea ter relayl ocat ed i n the Auxilia ry Junct ion Box (AJB) by providing a ground pa th for the re lay coil. The energiz ed relay provide s a bat teryf eed to t he heat er e leme nt. Afte r a period of 12 minute s the ATC module re moves the heat ing request . The CJB then powe rsdown the rea r wi ndow he ate r by removing the ground pa th f or t he relay coil .
The ATC module will only reques t re ar window heate r opera tion if the e ngine is running. An engine stat us s ignal is provide d tot he ATC module by t he ECM over the high speed CAN bus.
Exterior Mirror Heaters
O peration of the ext erior mirror heat ers is fully a utomat ic a nd re qui res no input from the driver. The exterior mirror hea tersa re a ctive when the ambient air tempera ture is below 5°C (41°F) and e ngine coolant te mpe rature i s be low 65° C (149° F).Ambi ent air a nd engine coola nt t empera ture val ues are provided by the ECM on the high speed CAN bus. O n re ceipt of the set emperat ure values, the CJB det ermines if e xterior mirror he ating is require d.
The CJB requests exterior mirror hea ting by transmit ting a high spe ed CAN bus mes sage to bot h the drivers and pa sse ngerdoor module s. The door modules provide fee d and ground paths to the respecti ve e xterior mirror he ating el eme nts . W hena mbi ent and engine cool ant tempera ture ris es a bove the va lues sta ted earl ier, the CJB transmi ts a high speed CAN busmess age to the door module s ca nce lling the hea ting reques t.
Seat Heaters
O peration of the sea t he aters is controll ed by the ATC module on re ceipt of a heati ng reque st f rom either of the se at heat ermomenta ry s witches loca ted on the cont rol pane l. The s witches are mounte d in the LH and RH rota ry controllers. A singlepress of a se at heat er switch wi ll implement low level heati ng a nd illumina te a tell-tale LED. A second pre ss of the switch willi mple me nt high l eve l hea ting and ill uminate 2 te ll-t ale LED's. A third press of t he s witch will turn t he s eat hea ter off.
Seat hea ting request s are transmitte d from the ATC module to the seat hea ter control modules on the LIN bus . Two se atheat er control modul es a re f itted, one under each front seat . The se at heat er control modules provide an e lect rical supply tot he s eat hea ter e lement s and a tempera ture sensor loca ted in t he s eat cus hion.
The s eat hea ter cont rol module provides a 5 V reference fee d to the sea t he ate r te mpe rature s ensor. The s eat hea tert emperat ure sensor is an NTC thermistor. By monitoring the ret urne d voltage, t he control module can calculate thet emperat ure of t he s eat. If t he t empera ture rise s above the target tempera ture , the control module wi ll dis abl e operat ion oft he heat er e leme nts .

Publi s hed: 11-May-2011
Climate Control - Evaporator Temperature Sensor
Removal and Inst all ati on
Removal 1.
2.
Installation To i nst all , revers e t he removal procedure.
1.