1996 HONDA CIVIC srs unit

Troubleshooting
DTC 2-4 - Without Front Passenger's Airbag
CAUTION: Whenever the ignition switch is ON 0l). orhas been turned OFF for lsss lhan three minutes. becaretul not bump the SRS unit; the airbag could acci-dentally doploy and causo damage or iniuries.
Try to r€produc€ tho SRS indic.to. light:1. Erase the DTC memory (see page 24,15).2. Turn the ignition switch ON (ll), and check that the SRS indi-cator light comes on for about six seconds and go€s off.
Do€rthe SRS indicrtor light stay on?
NOrEs
lntormitteit t ilur., iyst m b OK at thb tim6. Sle Troubleshooling Intdmitt.nt Frilu.os on pag6 2+lS.
Check for a short to power in the SRS main h.rna3s:1. Disconnect the baftery negative cable, then disconnectthe positive cable, and wait for three minutes.2. Dlsconnect the driver's airbag 2p connector from thecable reel 2P connector (see page 24,11).3. Dlsconnect the SRS main harness l8p connector tromthe SRS unit.4. Beconnect the battory positiv€ cable, then reconnect thenegative cable.5. Connect a voltmeter between the No. lO (+) terminal ofthe SFS main hsrness 18P connector and qround.6. Turn the ignition switch ON {ll), and me-asure voltage.There should be 0.5 V or less.7. Connect a voltmeter between the No. 14 (+) terminal ofthe SRS main harness 18P connoctor and ground, andmeasure voltage. There should be 0.5 V or less.
A.e voltage. .3 spocifi.d?
YES NO
F.ulty SRS uniC .epla"" tl,. SnS unn l""" p"g" 2+7O:_l
Short to pow.r in tha SRS mlin harnc$ or tho dummyr*istor; chock lor contact bctwcen th. dummy r6ai3to. rndrnother wiro. lf there is no contrct, rcphcc the SRS msinhame3s.
SBS UNIT
SRS MAIN18P CONNECTOR
24-60
I

)DTC 2-5 - Without Front Passenger's Airbag
CAUTTON: Whenever the ignition switch is ON lll)' ol
has been turnsd OFF for less than three minutes' be
careful not to bump the SBS unit; the airbag could acci'
dentally deploY and Gause damage or iniuries'
Tru to .oproduce the SRS indic'tor light:
1 Erasethe DTC memory {see page 24 15)'
z. irin tfie ignition s.itch ON (ll), and check that the SRS indi-
iatoi ligiricomes on for about six seconOs and goes otf
Does the SRS indic.tor light stay on7 |
NOYES
tn---t",-in"m l"itrt", "v"tem is oK at thb lim' seo Troubl'-
3hooling Intormitt6nt Failures on pago 2+15'
ffih",n"""'i. oi""onn""t ttte u"tt"ry negative cable' then disconnect
the Dositive dable, and wait lor th ree mrnutes'
z. 6i"J-"""a tt'" driver's airbag 2P connector {from the
cable reel 2P connector (see page 24_11)'
s. b]""onn""t,f'" SFS main harness 18P connector from
the SRS unit.
L di"lfi""i"on." between No lo terminal of the sRS
main harness 18P connector and ground and between
iie t'lo. t a terminat of the SRS main harn€ss 18P connec-
I tor and ground There should be 1 Mo or more'
I btheresistanceasso444g14._._
NOYES
-Faulty sRs unit; ,epltce the sRs unit (see page 2+761'
SRS UNIT
SRS MAIN HARNESS
18P CONNECTOR
IJ
ness,
6lort to sround in tho sRS main harness or the dummY
i""i"toi; "-ft""* fot "ont.ct bdtwo€n the dumTI Iesbt9r.and
li"r"J. n irt"t" is no contact. r6pl'co the sRs mtin h6i'
24-61
ott

Troubleshooting
DTC 8-6
CAUTION: Whonover the ignition switch is ON lll), or
has been turned OFF for less than thro€ minutes, be
careful not to bump th6 SRS unit; the airbags couldaccidentally deploy and cause damage or iniuries.
Besides indicating an abnormality in the SRS unit, DTC
8-6 may also indicate that two problems equivalent to
DTC 1-l and 2-4, 1-4 and 2-1, ot 1-4 and 2-4 occurred at
the same time. Proceed in the order shown below.
SRS MAIN HARNESS18P CONNECTOR
\
24-62
Check th. SRS main harn6$:1. Disconnect the battery negative cable, then disconnectthe positive cable, and wait for three minutes.2. Disconnect the driver's airbag (and front passenger,sairbag) connector(s) {see page 21-111.3. Disconnect the SRS main harness 18P connector fromrhe sRS unit.4. Reconnect the battery positive cable, then reconnect thenegative cable.5. Turn the ignition switch ON (ll).6, Connect a voltmeter and measure voltage botween theNo. 10 terminal of the SRS main harness 1BP connectorand ground, and betlveen the No. l{ terminal and qround.Th6re should be aoDrox. 0 - 0.5 V.
Aro voltages as spacified?
NOYES
Sho.t to power in tho SRS mrin hamoss; rsplace th6 SRSmain haanac3.
Chacl the SRS main hrrne*s and the cabl. reel:Connect a voltmeter and measure voltage between theNo. 1 terminal of the SRS main harness 18p connectorand ground, and between the No. 13 terminal andground. There should be approx. 0 - 0.5 V.
Are voltages o3 specilied?
YES
SRS unit; replace the SRS unit lse6 page 2+76).
NO
To page 24-63 (A)
o1,

Troubleshooting
DTC 9-2
CAUTION: Whenever the ignition switch is ON 0l), ofhas been turned OFF lor lass than three minutes, becareful not to bump the SRS unit; the airbag(s) couldaccidentally deploy lnd caqse damage or iniuries.
Check the tu.c:1. Turn the ignition switch OFF.2. Check for blown No. 23 (10 A) fuse in the under,dashfuse/relay box.
Replace the tuse. Turn the ignition switch ON lll) , and checkthat the fuse doesn't blow.
Th6 problem hs3 disappe.rod, TGt-dJiv€ the vehiclo and3ee Troublerhooting Intermiftcnt Failuro3 on paqo 2l-15.
Check tol short to ground betwe.n tho unde.-da3h fus./r.ley box and the SRS unit.1. Turn the ignition switch OFF.2. Disconnect the baftery negative cable, then disconnectthe positive cable, and waittorthree minutes.3. Disconnect the driver's (and front passenger,s) airbagconnector(s) (see page 24-11).4. Disconnect the SRS main harness 1gp connector fromthe sRs unit.5. Check resistance between the No. 3 terminal of the SRSmarn harness 18P connector and ground,There should be 1 MO or more.
Feufty SRS unh; rcphce the SRS unit lsee pag.2+761.
(A)To page 24-65
To page 24-65
No. 23 lr0 Al FUSEFUSE/RELAY BOX
!
SRS MAIN HARNESS18P CONNECTORSRS UN'T
24-64
I
SRS MAIN HARNESS 18P CONNECTOR
Otf

)
FUSE/BELAY BOX
Chcck for an op€n in th6 SRS main harness:
1. Turn the ignition switch OFF.
2. Disconne;t the battery negative cable, then disconnect
the positive cable, and wait for three minutes'
3. Disconnect tho driver's (and front passenger's) airbag
connector (see Page 24'11).
4. Disconnect the SRS main harness 18P connector from
the SRS unit
5. Reconnect the battery positive cable, then reconnect the
neoative cable.
6. Co-nnect a voltmeter betlveen the No 3 terminal ol the
SFS main harness 18P connector and ground'
7. Turn theswitch ON (ll), and m€asure
(cont'd)
(B) from page 24-64
Check tor ahort to ground in the SRS main harn$s:
1. Disconnect the SRS main harness 2P connector from the
under-dash fuse/relaY box.
2. Check resistance between the No. 3 terminal of the SRS
main harness 18P connector and ground There should
be 1.0 M0 or more.
ls the re3istance a3 specified? -
NOYES
Short to giound in tho undot-drlh lut'/rol'y box;
replace the undel-da3h fusgtgEl!9l--------.-
Short to ground in tho SRS m.in harn$s; ropleco the SRS
main harness.
(AlFrom page 24'64
Poor contact at the SRS main harnoss 18P connoctor;
check lho connoctor.. ll the connector k OK, sub3titute r known'good SRS
unh. and recheck. lf the problom is slill present, lepl.ce the SRS main
To page 24-66
SRS MAIN HARNESS18P CONNECTOR
o0
24-65

Airbag
)Replacement
After a collision in which the airbags were deployed' the
airbag assemblies and the SRS unit must be replaced'
!!!@ Store a removed airbag with the pad sur'
iFup. rr trt" airbag is improperly stored face down'
accidental deployment could propel the unit with
enough force to cause serious iniury'
CAUTION:
. Always disconnsct lhe airbag conn€ctor(s) when the
harness is disconnected.
. Do not disassemble or tamper with the ailbag'
NOTE:
. Do not install used SRS parts from another vehicle'
When repairing, use only new SRS parts'
o Carefully inspect the airbag before you install it Do
not insiall an airbag that shows signs oI being
dropped or improperly handled, such as dents' cracks
or deformation.
1. Disconnect the battery negative cable' then discon-
nect the positive cable from the battery' and wait at
least three minutes
2. Disconnect the airbag connector(s):
Driver's Side:
. Remove the access panel from the steering wheel'
then disconnecl the 2P connector betlveen the driv-
er's airbag and cable reel
NOTE: When disconnected, the airbag connector ls
automaticallY shorted
ORIVER'SAIRBAG
DRIVEE'S AIRBAG2P CONNECTOR
oo
Front Passengel's Side:
. Disconnect the 2P connector between the front pas-
senger's airbag and SRS main harness'
NOTE: When disconnected, the airbag connector is
automaticallY shorted.FRONT PASSENGER'S
AIRBAG2P CONNECTOR
3. Bemove the airbag(s):
Driver's Side:
. Remove the two Torx bolts using a Torx T30 bit' then
remove the driver's airbag
(cont'd)
24-67
SRS MAIN HARNESS
Use a Torx T30 bitTORX BOLTS

SRS Unit
Replacement
CAUTION:
. Betore disconnoqting lny pErt of the SRS wire hal-ness, disconnect th9 airbag conn"ctorlsl.. During installltion or teplacemsnt. do not bump(impact w.cnch, hamm€r stc.l the area noar tho SRSunit.
NOTE:
o Do not damage the SRS unit terminals or connectors.. Do not disassemble the SRS unit; it has no service-able parts,
. Store the SRS unit in a clean, dry a.ea,. Do not use any SRS unit which has be€n subjected towater or shows signs of being dropped or improperlyhandled. such 8s dents, cracks or deformation.
1. Disconnect the bsttery negative cable. then discon-nect the positive cable from the battery, and wait atleast three minutes.
2. Disconnect the airbag connector{s}:
NOTE: When disconnected, the airbag connector isautomatically shorted,
Driver's Side:
. Remove the access panel from the steering wheel.then disconnect the 2P connector between the driv_er's airbag and cable reel (see page 24-11).
Front Passenge/s Side:. Disconnect the 2P connector between the tront oas_senger's airbag and SRS main harness (see page 24-11).
24-76
o\
3. Remove the right side cover from the SRS unit.
SRS UNTT
TOBXBOLTSUge a TorxT30 bit.
RIGHT SIOE
Remove the left side cover from the SRS unit, thendisconnect the SRS main harness lgp connectorfrom the SBS unit.
SRS UNIT
5. Remove the four Torx bolts from the SRS unit, thenpull out the SRS unit from the driver,s side,
COVER

6. Install the new SRS unit.
NOTE: Do not reuse a torx bolt that has red
threads. Replace the bolt with a new one.
)
7.
TORX BOLTS9.8 N.m l'1.0 kg{.m, 7.2 lbf.ft}Use a Torx T30 bit.
Connect the SRS main harness l8P connector to the
SRS uniu push it into posjtion until it clicks.
Install the SRS unit covers (ri9ht and left). Make
sure the covers snap together in the middle.
8.
TORX BOLTS9.8 N.m 11.0 kgf.m, 7.2 lbf.ft)U3e . Torx T30 bit.
SRS MAIN HARNESS
)(l
9.
10.
't2.
Reconnect the driver's aibag 2P connector to the
cable reel 2P connector, then reinstall the access
panel on the steering wheel.
Reconnect the tront passenger's airbag connector
to the SRS main harness.
Reconnect the battery positive cable, then the nega
tive cable.
After installing the SRS unit, confirm proper system
operation: Turn the ignition switch ON (ll); the SRS
indicator light should come on for about six seconds
and then go oif.
11.
24-77
.-