Symptom:
A. HEATER P RE-TEST
POSSIBLE CAUSES
NO RE SP ONSE F ROM CABIN HE ATE R MODULE OR HE ATE R BOOSTE R MODULE
CABIN H EATE R MODULE OR HE ATER BOOSTER MODULE DTC(S) P RESE NT
AUTOMATIC TE MPE RATURE CONTROL DTC(S) P RESE NT
HEATER SYSTEM COMPONENTS
TE S T ACTION AP PLICAB ILITY
1 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 t h e ign it ion off a n d eit h er a llow t h e en gin e coola n t t o cool down t o a t lea st 50°C
(122°F ) or cold soa k t h e en gin e.
CAU TION : Whe n us i n g a p o w ered e x h a us t v en t i la t io n s y s t e m , d o n o t a t ta c h
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 exha u st vent ila t ion syst em , affix t he ven t ila t ion h ose to t h e
hea t er ’s exh a u st pipe or t o t h e veh icle in su ch a ma n or t h a t t he end of t h e ven t ila t ion
hose rem a in s a ppr oxim a t ely t h r ee in ch es a wa y fr om t h e en d of th e exh a u st pipe.
Wh en u sin g a n on -power ed exh a u st ven t ilat ion syst em , a ffix t h e ven t ila t ion h ose
dir ect ly to t h e hea t er ’s exh a u st pipe.
Tur n th e ign it ion on .
Wit h th e DRBIII", a t tem pt t o com m un ica te wit h th e Ca bin H ea t er Modu le or H ea t er
Boost er Modu le an d t h e Au t om a t ic Tem per a t u r e Con t r ol Modu le.
Does t h e DRBIII" display: NO RESP ONSE ?
All
Ye s → Refer t o t h e Com m u n ica t ion Ca t egor y for th e rela t ed sym pt om .
Per for m H E ATE R VERIF ICATION TE ST - VER 1.
No → Go To 2
69
CABI N H EAT ER
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