TE S T ACTION AP PLICAB ILITY
2 WA R N I N G : N E V E R O P E R AT E T H E H E AT E R I N A N E N C L O S E D A R E A
TH AT D OES N OT HAVE EXH AU S T VEN TILATION FACILITIES . A LWAYS
VEN T THE EXHAU S T WHE N OP ERATIN G THE HE ATER. F AILU R E TO
FOLLOW TH ES E IN S TRU CTIONS CAN RES U LT IN P E RS ON AL IN J U RY
OR D E ATH .
WA R N I N G : A L L O W T H E H E AT E R A S S E M B LY T O C O O L B E F O R E P E R -
FOR MIN G A COMP ON EN T INS P E CTION /RE PAIR /REP LACE MEN T. FAIL-
UR E TO F OLLOW THES E IN STR U CTION S CAN RE SU LT IN P E RS ON AL
IN JU RY OR D E ATH .
Tur n th e ign it ion off.
NOTE: Ch e c k c o n n e c to rs - Cle an /re pa i r a s n e c e ss a ry.
Discon n ect t he Ca bin Hea t er h a rn ess con n ect or.
Rem ove t h e Cir cu la t ion P um p Rela y from th e r ela y cen t er.
Mea su r e t h e r esist a n ce of t h e Cir cu la t ion Pu m p Rela y H igh Side Con t r ol cir cu it
bet ween t h e Ca bin H ea t er h a r n ess con n ect or an d t h e rela y cen t er (Cir cu la t ion P u m p
Rela y con n ect or ter m in a l 86).
Is t h e resista n ce below 5.0 ohm s?
All
Ye s → Go To 3
No → Repa ir th e Cir cu lat ion P u m p Rela y High Side Con t r ol circu it for
an open.
Per for m H E ATE R VERIF ICATION TE ST - VER 1.
3 WA R N I N G : N E V E R O P E R AT E T H E H E AT E R I N A N E N C L O S E D A R E A
TH AT D OES N OT HAVE EXH AU S T VEN TILATION FACILITIES . A LWAYS
VEN T THE EXHAU S T WHE N OP ERATIN G THE HE ATER. F AILU R E TO
FOLLOW TH ES E IN S TRU CTIONS CAN RES U LT IN P E RS ON AL IN J U RY
OR D E ATH .
Tur n th e ign it ion off.
Recon n ect t h e Ca bin Hea t er ha r n ess conn ect or.
In st all a su bst it u t e r ela y in pla ce of t h e Cir cu la t ion Pu m p Rela y.
Tur n th e ign it ion on .
Ver ify t h a t th e Ca bin H ea t er i s swit ch ed off.
Set t h e blen d con t r ol t o th e m a x h ea t posit ion a n d t he m ode cont r ol t o th e floor
posit ion .
Wit h th e DRBIII", er a se t he Ca bin Hea t er Modu le’s DTCs.
St a r t th e engin e. Allow th e en gin e t o idle.
Wit h t h e DRBIII, m on it or for Ca bin H ea t er Modu le DTCs wh ile per for m ing t h e
followin g st ep.
NOTE: Do not disconnect the vehicle’s battery or the heater’s main power
su p p ly w hi le th e h e at e r is i n o p e ra tio n or i n ru n -d o w n m o d e . Fa i lu re to
fo ll o w t h e s e i n s t ru c t i o n s c a n r e s u l t i n e x c es s e mi s s io ns fr o m t h e hea t e r
during heater operation.
Swit ch th e Ca bin H eat er on. If n ecessa r y, allow t h e h ea t er t o ru n th r ou gh a t lea st on e
cycle of oper a t ion (a ppr oxim a t ely 10 min u t es), a nd t h en t u r n th e hea t er off.
Tur n th e en gin e off.
Does t h e DRBIII" display: CIRC P UMP CONTROL OPEN?
All
Ye s → Repla ce t h e Ca bin H ea t er Assem bly in a ccor da n ce wit h t he
Ser vice In for m a t ion . Rein st a ll t he or igin a l Cir cu la t ion P u m p
Rela y.
Per for m H E ATE R VERIF ICATION TE ST - VER 1.
No → Repla ce th e or igin a l Cir cu la t ion P u m p Rela y in accor da n ce wit h
th e Ser vice In form a t ion .
Per for m H E ATE R VERIF ICATION TE ST - VER 1.
73
CABI N H EAT ER
CIRC PU MP CON TR OL OPE N — Co n t i n u ed
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