rea ch in g oper at in g tem per at u r e. Th e h ea t er ’s con-
tr ol u nit con t r ols a nd m onit ors com bu st ion oper a-
tion t h rou gh va riou s in pu t s a nd ou tpu t s t h at a r e
cont a in ed inside t he h ea ter a ssem bly. Th e su pple-
men t al hea t er con n ect s to th e vehicle’s h eat er h oses
an d u ses a separ a te fuel su pply lin e a n d fuel pu m p
th a t conn ect s to t h e veh icle’s fu el t a n k. Un like t he
Hea t er Boost er, t h e Ca bin H ea ter Assem bly h a s a n
in t egr a l coola nt pu mp wh ich allows h ea ter oper a -
tion wit h ou t t he veh icle’s engin e r u nn in g. In a ddi-
tion , a pr ogr a mm a ble t imer m odu le can a lso be
added to this system. Neither the Cabin Heater
Assem bly nor th e H ea ter Boost er Assem bly a r e
conn ect ed t o t h e CAN Bu s. Com mu n ica t ion be-
tween th e hea t er’s cont r ol u nit a n d t h e DRBIII"
occur s t h rou gh t he Dia gn ost ic Lin k Con nect or
(DLC) via a K-Lin e.
3.3.2.2 VENTING THE HEATER’S EXHAUST
WARNING: NEVER OPERATE THE HEATER
IN AN ENCLOSED AREA THAT DOES NOT
HAVE EXHAUST VENTILATION FACILITIES.
ALWAYS VENT THE HEATER’S EXHAUST
WHEN OPERATING THE HEATER. FAILURE
TO FOLLOW THESE INSTRUCTIONS CAN
RESULT IN PERSONAL INJURY OR DEATH.
WARNING:
ALLOW THE HEATER ASSEMBLY TO
COOL BEFORE PERFORMING A COMPONENT
INSPECTION/REPAIR/REPLACEMENT. FAILURE
TO FOLLOW THESE INSTRUCTIONS CAN
RESULT IN PERSONAL INJURY OR DEATH.
CAUTION: When using a powered exhaust
ventilation system, do not attach the exhaust
ventilation hose directly to the heater’s
exhaust pipe. Too much suction can prevent
heater operation.
Wh en usin g a power ed exh a ust ven tila t ion sys-
tem , affix t h e ven t ila tion h ose t o t h e hea t er ’s ex-
ha u st pipe or t o t h e veh icle in su ch a m a nor t h at t he
en d of t he ven tila t ion h ose r em ain s a ppr oxim at ely
th r ee in ch es a wa y fr om t he en d of th e h eat er ’s
exh a u st p ipe.
Wh en usin g a non -power ed exh au st ven t ila tion
syst em , a ffix t he ven t ila tion h ose dir ect ly to the
heater’s exhaust pipe.
3.3.2.3 SYSTEM DIAGNOSTICS
CAUTION: Always Perform The Heater
Pre-Test (In The Diagnostic Procedures) Prior
To Performing Any Other Test For The Test
Result To Be Valid.
Fa u lt det ection is th rou gh st ored Dia gn ost ic
Trou ble Codes (DTCs). DTCs ar e displa yed by t he
DRBII I". Th e h ea ter ’s con tr ol un it will st ore up t o
five DTCs in it s mem or y. If th e con t rol u nit det ect s
a new fa u lt in t h e system , on e t ha t is n ot a lr ea dy
st ored in it s m emor y, it will clea r t he oldest of t h e
five st ored DTCs, a n d it will stor e th e n ew fa u lt ’s
DTC. If t h e con tr ol un it det ect s a reoccu r ren ce of a
st ored fa u lt , it will over wr it e t h at fa ult ’s DTC with
th e most r ecen t occu r r en ce.
DIAGNOSTIC TIPS
SENSOR VALUES
Op e r a ti n g Vo lt a g e
Th e n or m al r an ge for t he Oper a tin g Volt age is fr om
10 volt s to 15 volt s. Th e va lu e in dica tes t h e volt a ge
at the heater’s Fused B+ terminal.
Heating Capacity
Th e n orm a l ra nge for t h e h ea tin g ca pa cit y is fr om
0% t o 100%. Th e va lu e in dica tes t h e m om en ta r y
out pu t of t he au xilia r y hea t er in % of th e m a xim um
out pu t .
Co o la nt Te mp era t u re
Th e va lu e in dica t es t h e cu r ren t coola nt t em per a -
ture.
Flame Sensor Resistance
Th e n orm a l r a nge for t h e Fla me Sen sor is from 750
ohm s to 2270 oh m s. Th e v a lu e in dica t es th e m o-
men t ar y r esist a nce of the Fla m e Sen sor.
IN P UT/OU TP UT STATU S
Dosing Pump
A st at u s of #ON # in dica t es t h a t t he Dosin g Pu m p is
opera t ion a l. A st a t us of #OF F # in dica tes th e Dosin g
Pu m p is not oper a tion al.
Glo w P i n
A sta t us of #ON # in dica tes t ha t th e Glow P in is
en er gized. A st a tus of #OF F # in dica t es th e Glow Pin
is n ot en er gized.
Co m b u s t io n F a n
A st at u s of #ON # indica tes t h at t h e Com bu st ion F a n
is oper a t ion a l. A sta t us of #OF F # in dica t es t he
Com bu st ion F a n is n ot oper a t ion a l.
Ci rc u la t io n Pu mp
A st at u s of #ON # in dica t es t ha t t he Cir cu la t ion
Pu m p is oper a t ion a l. A st at u s of #OF F # in dica t es t h e
Cir cu la t ion P u mp is n ot oper at ion a l.
Front End Blower
A st at u s of #ON # in dica t es t h a t the Blower Mot or is
opera t ion a l. A st at u s of #OF F # in dica t es th e Blower
Mot or is not oper a tion al.
8
GEN ERAL I N FORM AT I ON
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