loa ds ar e con n ect ed t o ca bles a nd m oun t ed in a
st ora ge case. Th e ca bles ca n be dir ect ly con nect ed to
som e a ir bag syst em con n ect ors. J um pers a re u sed
to conver t t he loa d t ool cable con n ect or s t o th e ot her
air ba g syst em connect or s. Th e a da pt er s a r e con -
nect ed t o th e m odu le h a rn ess con n ect or to open
sh ort ing clips a nd pr ot ect t h e conn ect or ter m in a l
du rin g test in g. Wh en u sin g t he load t ool follow all of
th e sa fet y pr ocedu res in th e ser vice in for m at ion for
discon n ectin g a ir ba g syst em com pon en t s. In spect
th e wir in g, con n ect or a n d t er min a ls for da m age or
misa lignm en t. Su bst it u te th e a ir ba g loa d t ool in
pla ce of a Dr iver or P a ssen ger Air ba g, sea t belt
ten sion er, clockspr in g (u se a ju m per if n eeded).
Th en follow a ll of t h e sa fet y pr ocedur es in th e
service in for m at ion for connect in g a ir ba g syst em
compon en ts. Rea d t he modu le a ctive DTCs. If t h e
modu le r epor ts NO ACTIVE DTCs t h e defect ive
compon en ts h a s been rem oved fr om t h e syst em a n d
sh ould be r epla ced. If t h e DTC is st ill act ive, con-
tin ue this pr ocess un t il a ll com pon ent s in t he cir cu it
ha ve been t est ed. Th en discon n ect t he m odu le con -
nect or a n d con n ect th e m a tch in g a da pt er to t h e
modu le conn ect or. Wit h a ll a ir ba gs discon nect ed
an d t he a da pt er in st a lled t he squ ib wir in g ca n be
test ed for open a n d sh or ted con dit ion s.
3.1.6 DIAGNOSTIC TROUBLE CODES
Air ba g dia gn ost ic tr ouble codes con sist of a ct ive
an d stor ed codes. If m or e t ha n on e code exist s,
dia gn ost ic pr ior it y sh ould be given t o t h e act ive
codes. E ach dia gn ost ic t r ouble code is dia gnosed by
followin g a specific t est in g pr ocedu re. Th e dia gn os-
tic test pr ocedu res cont a in st ep-by-st ep in st r uct ion s
for deter m in in g t he cau se of t h e t r ouble codes. It is
not n ecessa ry to per for m all of t he t est s in t h is book
to dia gn ose an in dividu a l code. Alwa ys begin by
rea din g t he dia gn ost ic t rou ble codes wit h t he
DRBII I". Th is will dir ect you t o t he specific t est (s)
th a t m u st be per for med. In cer t a in t est procedu r es
wit h in t his m a nu a l, dia gn ost ic tr ou ble codes a re
used a s a diagn ost ic t ool.
3.1.6.1 ACTIVE CODES
If th e la mp r em ain s on , t her e cou ld be a n a ctive
DTC in the syst em . Th e code becom es a ct ive a s soon
as the m a lfu n ction is detect ed or key-on , which ever
occur s fir st . An a ct ive t r ouble code in dica t es a n
on-goin g m alfu nct ion . Th is mea n s t h at t he defect is
cur r en tly th er e ever y t im e th e air ba g con t rol m od-
ule ch ecks t h a t cir cu it or com pon en t . Som e DTCs,
In ter n al Modu le a nd squ ib DTCs, will keep t he
in dica t or illu m in a t ed even if th ey a r e n o lon ger
act ive. If t he la m p is on a n d n o a ct ive codes a re
pr esen t , cyclin g th e ign it ion swit ch off a n d th en on
will r efr esh th e la m p st at e. It is im possible t o er a se
an a ct ive code.
3.1.6. 2 S T OR ED COD ES
Air ba g codes ar e a u tom a t ica lly st ored in t he
ACM’s m em or y a s soon a s t h e ma lfu n ct ion is de-
tect ed. A st ored code indica tes t her e was an a ct ive
code pr esen t a t som e t im e. St or ed dia gn ost ic t r ou -
ble code will r em a in st or ed u n til er a sed by t he DRB.
If a m a lfu n ct ion is n ot a ctive wh ile per form ing a
dia gn ost ic t est pr ocedu re, th e act ive code dia gn ost ic
test will not loca t e t he sou r ce of t h e pr oblem . In th is
case, t he st ored code ca n i n dica t e an ar ea to inspect .
Ma in ta in a sa fe dist an ce fr om a ll a ir ba gs wh ile
perfor m in g t h e followin g in spect ion . If n o obviou s
pr oblem s a r e fou nd, er ase st or ed codes, an d with
th e ign it ion on wiggle th e wir e h a rn ess and con nec-
tor s, r ot at e t h e st eer in g wh eel fr om st op t o st op.
Rech eck for codes per iodica lly a s you wor k th r ou gh
th e syst em . Th is pr ocedu r e m a y un cover a m a lfu n c-
tion t ha t is difficu lt t o l oca te.
3.2 COMMUNICATION
3.2.1 COMMUNICATION K-LINES
Th e K-Lin es a r e a gr ou p of cir cu it s th a t con nect
ea ch con tr ol m odu le t o t he Da ta Lin k Con n ect or
(DLC). E a ch cont r ol modu le is con n ect ed t o th e DLC
wit h a sin gle K-Lin e. Th e DRBIII" u ses t he K-Lin e
to com mu n ica t e wit h ea ch con tr ol m odu le. Wit h th e
use of t h e K-Lin es t h e DRBIII" is a ble t o rea d ea ch
cont r ol m odu les DTCs, sen sor displa ys, I/Os et c. If
DRBII I" comm u nica tion s wit h a par t icu la r con t r ol
modu le is lost , on e of th e possible ca uses cou ld be a
fau lt in t he modu le’s K-Lin e.
NOTE: It is important to note the DRBIII!
uses the K-Lines for diagnostic and
monitoring functions and is no way
connected to the CAN data bus network.
Th e followin g modu les t h at u se t h e K-lin e on th is
veh icle ar e:
• Air ba g Con t r ol Module (ACM)
• Aut om a tic Tem per at u re Con t rol (ATC)
• Ca bin H eat er Modu le (CH M)
• Cen t r al Timer Modu le (CTM)
• Con tr oller Ant ilock Br ake (CAB)
• En gin e Con tr ol Modu le (ECM)
• Hea t er Boost er Modu le (HBM)
• In st ru m en t Clu st er (IC)
• Sh ift er Assem bly (SA)
• Secu rit y Syst em Modu le (SSM)
• Sen tr y Key Rem ot e E nt r y Modu le (SKRE EM)
• Tra nsm ission Con t rol Modu le (TCM)
4
GEN ERAL I N FORM AT I ON
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