Symptom:
CABIN HE ATE R CON TROL S H ORTED LOW (ACTIVE)
POSSIBLE CAUSES
CABIN H EATE R OR HE ATE R BOOSTE R CONTROL UN IT
CABIN H EATE R CONTROL CIRCUIT SH ORTE D TO GROUND
CABIN H EATE R CONTROL CIRCUIT SH ORTE D TO GROUND CIRCUIT
CABIN H EATE R CONTROL CIRCUIT SH ORTE D TO SE NSOR GROUND CIRCUIT
AUTOMATIC TE MPE RATURE CONTROL (ATC)
TE S T ACTION AP PLICAB ILITY
1 Tur n th e ign it ion off.
Discon n ect t he Ca bin Hea t er or Hea t er Boost er ha r n ess con nect or.
NOTE:All of the following criteria must be met in order to successfully run
the ATC Function Test.
Pla ce th e sh ift lever in Pa r k.
Tur n th e ign it ion on .
Wit h th e DRBIII", r ecor d a nd er a se ATC DTC’s.
St a r t th e engin e. Allow th e en gin e t o rea ch n orm a l opera t ing tem per a t u r e.
Set t he blower to high speed.
Pr ess t h e Air Con dit ion in g swit ch On .
Wit h t he DRBIII", ver ify th a t t he am bien t t em per at u r e is a bove 59°F (15°C), th e
refr iger a n t pr essu r e is bet ween 29 a n d 348 P SI (2 a n d 24 ba r ), t h e eva por a t or
tem per a t ur e is a bove 36.5°F (2.5°C), a n d t h e coola n t t em per a t ur e is a bove 158°F
(70°C).
Wit h t h e DRBIII" in Aut om a t ic Tem pera t u r e Cont r ol (ATC), select Syst em Tests an d
select ATC F u n ct ion Test . Wh en t h e ATC Fu n ct ion Test is complet e, pr oceed a s
follows:
Wit h th e DRBIII", r ea d t he a ct ive ATC DTCs.
Does t h e DRBIII" displa y: CABIN HE ATE R CONTROL SH ORTE D LOW?
All
Ye s → Go To 2
No → Repla ce th e Ca bin H ea t er Assem bly or t h e Hea t er Boost er a ssem -
bly in a ccor da n ce wit h th e Ser vice In for m a t ion .
Per for m BODY VERIFICATION TE ST - VE R 1.
2 Tur n th e ign it ion off.
Discon n ect t he Ca bin Hea t er or Hea t er Boost er ha r n ess con nect or.
Discon n ect t he Aut om a t ic Tem pera t u r e Con t r ol (ATC) C1 ha r n ess conn ect or.
Mea su r e th e resista n ce between gr ou n d a n d t h e Ca bin Hea t er Con t r ol circu it .
Is t h e resista n ce below 30k ohm s?
All
Ye s → Repa ir t h e Ca bin Hea t er Con t r ol cir cu it for a sh ort t o gr ou n d.
Per for m BODY VERIFICATION TE ST - VE R 1.
No → Go To 3
150
HEAT IN G & A/C
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