ACURA INTEGRA 1994 Service Repair Manual

Supplemental Restraint System (SRSI
Troubleshooting
Self-diagnosis Function
The SRS unit includes a self-diagnosis function. lf there
is a failure in the sensors. SRS unit, inflator, or their cir-
cuits, the SRS indicator light in the gauge sssembly
comes ON.
As a system check, the SRS indicator light also comes
on when the ignition is first turned ON to the (ll) posi-
tion. lf the light goes off after approximately six sec-
onds, the system is OK.
lf the SRS indicator lighr remains on (or fails to come on
in the system check mode), one of the SRS components
(or the wiring/connectors inbetween) is laulty
Troubleshooting Precautions
a Always use the test harness. Do not use test probes
directly on component connector terminals or wires;
you may damage them or the SRS unit.
a When connecting any of the test harnesses to the
system, push the connectors straight-in; do not bend
the connector terminals,
. Before disconnecting any part of the SRS wire har-
ness, connect the shon connector (RED) on the driv-
er's airbag. On cars equipped with a front passen-
ger's airbag, connect short connectors on the driver's
airbag and the front passenger's airbag.
SRS Indicator Light Troubleshooting
Possiblo conditions:
1. SRS indicator light does not come on at all - see
page 23-278.
2. SRS indicator light stays on constantly - see page
23-242.
3. SRS indicator light comes on in combination with a
failure of another electrical system (charging sys-
tem light). Check for damage/corrosion at the
under-dash tuse/relay box connector.
NOTE:
. Before starting the applicable troubleshooting. check
the condition of all SRS connectors and ground
points.
. lf the fault is not found after completing the applica-
ble troubleshooting, substitute a known-good SRS
unit and check whether the indicator light goes off.
23-276
MAIN HARNESS
Connecting the Short Connectors
@ To avoid.ccidental doploymont and pos.
siblo iniury. alway3 connect ths protoctive short con.
noctor to tha driver's airbag connectot and, on caf!
equippod with front passongor's airbag, conncqt Prolac-
tivs ghort connoctors to the d.ivsr's and tront passsn-
gar's airbag before working nsai any SRS wiring.
NOTE: The original radio has a coded theft protection
circuit. Be sure to get the customer's code number
before disconnecting the battery cables,
Disconnect the battery negative cable, then discon-
nect the oositive cable.
Connect the short connector(s) (RED):
Drivsr's Sido:
. Romove the accoss panel trom the steering
wheel, then remove the shon connector (BED)
1.
2.
from the panel.DRIVER'SAIRBAG
CABLE R€EL
3-P
ACCESSPANELSHONT CONNESTOR(REDI
. Disconnect the connector between the driver's
airbag and cable reel, then connect the short
connector {RED} to the airbag side of the connec-
tor.
Front Pas€ngo/s Sido:
. Remove the glove box damper (see section 20),
and then remove the glove box.
. Disconnect the connector between the front pas-
senger's airbag and SRS main harness, then con-
nect the short connector (RED) to the airbag side
of the connector,SHORT CONNECTOR

Test Harnesses and Attachment Points
SRS UNIT
Test Hsrness A
TEST HARNESS A07MAZ - SL|D500TEST HARNESS C07LA:Z - SL.()3(X'
Tast Harness B
TEST HARNESS B07MAZ - SP@500
ROW A ISRS UNfT ENDI
238
ton12l31616
213151617|l
I21215l6171A
ROW B IWIRE HARNESS END)
23-277

Supplemental Restraint System (SRS)
Troubleshooting
The SRS Indicator Does Not Light
CAUTION: Uss only a digital multimeter to check the system. lf it's not a Honda multimeter, make sure its output is
10 mA {0.01 Al or less when switched to the smallest value in the ohmmeter rang€. A tester with a highor ouiput could
damage the airbag circuit or cause accidental airbag deployment and possible iniury
NOTE: The original radio has a coded theft protection circuit. Be sure to get the customer's code number before discon-
necting the battery cables.
Dilconn6ct the battory negaiivecable rnd thon tho positive
cable.Connest the short connectorlslto tho airbaglsl (seo p6ge 23-272t.
R€connect the batterY Positivecable and then the negativecable.
Turn the ignition switch ON (ll).
Does the brake systemlight come on (in thegauge assembly)?
Inspect the No. l5 110 A) fuse(under-dash tuse/relay box).
ls No. 15 fuse OK?Turn the ignition switch OFF.
Repair open in dashboard wir6harness between the No. 15 tus€and gauge a3sombly.
Disconnect the SRS main har-ness l8-P connector from theSRS unit.
Turn the ignition switch ON (ll).
Does the SRS indicatorlight come on?The SRS unit is faully.
Turn the ignition switch OFF.
SRS UNIT
SRS MAIN HARNESS18.P CONNECTOR
Io page 23'2791
23-274

SRS MAIN HABNESS(From plgr 23.27E1
DASHBOARD WIFE HARNESS5-P CONNECTOR
8tU{ +
@
I:
Disconnoct tho SRS m.in h6,-ng88 {-P conn6clor f,om thomrin wiao harn6$.
Tum lhq ignition switch ON (lll.
Doo3 tho SRS indic.torlight com6 on?Th. SRS rnlin h..n... i.t ulty.
Tu.n tho ignition switch OFF.
Romovo tho g!u0c !ss.mblyth6n inrpoct ths SBS indicatorlight bulb.
Raplaca lh. indlc.toi llOht birlb.
Connoct ! voltmotoa bdwoln thrNo. 5 lormin.l (+) of tho 5-P con-noctor rnd body ground (-).
Turn the ignition switch ON (ll).
Moaauro tha voltrgo bolwcon thaNo. 5 termin.land body g.ound.
MAIN VNREHARNESS
(To p.go 2+280)
23-279

(From page 23-279)
Short in 8LU wire ol the da.h-borrd wi.o halno3s. Roplaca thad.3hbosrd wiro ha.no$.ls there lesslhan 8.5 V ?
Turn the ignition switch OFF
Connect tho voltmeter betweenthe No. 1 terminal (+) and the No.3 terminal (-) of the dashbo€rdwire harness 5-P connector.
Turn the ignition switch ON (ll).
Measure the voltage between theNo. 1 terminal and th€ No.3 ter-mrnal,
Ch6ck for continuity between th6No. 3 terminal and body ground.ls there battery vohage?
R.prir opcn in tho BLK wir. (No.
3 tarmin!l) batwaan th. gluga
araambly and body ground otlook tor. poor ground 1G201,cilol I.
Turn the ignition switch OFF.
Rcprir open in th. YEL wi.o lNo.t t6rminall of the d.3hbo.rdwir6 hamer! batwaen tho gtugo
r3s6mblv rnd tho No. 15 ll0 Alfu36.
Supplemental
Troubleshooting(cont'd)
{To page 23-281}
RestraintSystem (SRSI
DASHBOARD WIRE HARNESS
View lrom wire side.
YELI+, BLK{-I
23-280

(From page 23-280)
Reconnect each connector to thegauge assembly and SRS unitthen connect Tgst Harness A tothe SRS unit.
Turn the ignirion ON 0l) andmoasure th€ voltage betwegn theNo. 13 terminal (+) and bodyground (-) tor six seconds.
SBS indic.tor circqit {in th.e.ug. r.t mblv, i. hulty,ls th€r6 more than 8.5 V?
TEST HARNESS A07MAZ - S!IX)s{X'
48
910Itl213l41516
23-2a1
,;l tflEt$ r'

Supplemental Restraint System (SRSI
Troubleshooting (cont'dl
SRS Indicator Light Stays on Continuously
NOTE: Before troubleshooting, make sure that battery
voltage is 12 V or mo.e. Otherwise you'll obtain wrong
test readings.
1. Make a photocopy of the chart on page 23-283,
2. Connect Test Harness A to the SRS unit as shown.
Tu.n the ignition switch ON (lll.
. Voltages in the chart assume the car's "battery
voltage" is about 12 volts. Less than 12 volts will
result in different or possibly talse readings.
. Do not disconnect the airbags ftom the circuit
when checking SRS unit voltages.
First, check for voltage between Test Harnoss
Terminal No. 12 (+) and ground (-).
. lf no voltage is indicated, go to step I and contin-
ue checking all the other terminals.
o lf vottsge is indicated, there is a poor ground at
the SRS unit. Read the following NOTE, and then
go on to step 5.
I21I
tolll2t3tlrt
23-282
TEST HANNESS
NOTE: The original .adio has a coded theft protection
circuit. Be sure to get the customer's code number
before disconnecting the battery cables.
Before disconnecting any pan of the SRS wire har-
ness, connect the short connecto(s) {RED) to the
airbag(s) (see page 23-2721.
Connect Test Harness B between the SRS unit and
SRS main harn€ss 18-P connector.
7. Check for continuitv between the 85 terminal and
body ground, and the Bl5 terminal and body
ground.
TEST HARNESS B07MAZ - SPqrS{X)
lf there is continuity at either terminal, the SRS
unit is faulty. Replace it and check the voltages
according to the chan on page 23-283.
lf there is no continuity at either terminal, the
SRS unit ground, the SRS unit component
grounds or the SRS main harness is faulty
Check the grounds (check wire and control unit
mounting bolts) and, if necessary, replace th€
SRS main harness. Then check the voltages
according to the chart on page 23-283

8.Record you. voltage readings. for each terminal, inthe row of blank boxes near the top of the chart.
Compare each reading with the voltage ranges list-ed in the column below it. lf ths reading is within arange, circle that range.
oo4.512,O1/4.3
".)6r-
at'9
t.g4.55.512.O- 14.3
5.t4,5r2,o-t4.3
4.62.9rl.5-5.512.0- 14.3
2.9 18.7 | l..s lr2.ol3.7 l-rr.2l - | -5.8 l-ra.3l -
Circle the range if your reading is within it.
NOTE: Do not disconnect the airbag when checking SRS unit voltages.Whh tront passongor's sirbag:
lf you circled all the Failure Mode ranges across anyrow. check the car for the Probable Failure Mode list-sd at the end of the row. (Refer to the letter for thatmode on the following pages),
I
/
It you circl€d all the ranges in this row, tollow thetroubleshooting procedure under failure mode ,,C" on thefollowing pages.
lf you did not circle all the ranges across any row,replace the SRS unit with 8 known-good unit, andretest.- lf all your voltage readings are now normal,replace the original SRS unit.- lf your voltage readings are still not normal butthey don't fit within a complete row of FailureMode ranges, check the condition of the terminalsin esch of the SRS connectors shown in the svs-tom diagram on page 23-270,
1SAOH25aSADC10auclGNOt3tDc4,35.44.3-5.64.512.0-14.3t1,5- 14.5o13.64.4- 10.9
2.5-3.72_A4.512.O- 1rt.33.1-4,911.5- r4.5o2.O-4,54.410.9
oo4.5-5,512.014_3o11.514.5o2.O4.58.4- 10.9
8,6l1_3a_6-11.34,55.512.0- 14.311.2-14.611.5- 14.5o2.O4.54.410.9
5_74.512.0- 14.3-9.7r1,5-14,5o2.O4.58.4to.9
4.62.9-3,74.5-5.512,O-14.33,74.9I1.5l4_502.O4.58.410.9
2.94.7- 11 .24.5-5.5'12.o-14.33.74.911.5- 14.5o2.Oa_54.410.9
4,6l1_3a_6-t1.34.55.512.O-14.3oI t.5- r4.5o2.O-4,54.410.9
4.3-5,64.35.6oo11.5- t lt.5o2.O-4.54.4- 1o.9
4.35,64_35.64.55.512.Or4.3-7.31 1.5- 14.5oo 18.5- 13.64.410.9
23-283

Supplemental Restraint System (SRSI
Troubleshooting (cont'd)
NOTE: Do not disconnect the airbag when checking SRS unit voltages.
Without lront Passongor's sirbag:
Modo A: Open in one cowl sonsor conlact
r The SRS unit is faultY. Substitute a known-good SRS
unit and recheck the voltages according to the chart
on page 23-283.
Mods B:
. Short to driver's or Passonger's aitbag inflator body
(body groundl
. Short in dash sonsor
. Opsn in both cowl sgnsor contacts
NOTE: The original radio has a coded theft protection
circuit. Be sure to get the customer's code number
before disconnecting the battery cables.
1. Disconnect the battery negative cable and then the
positive cable. Then connect the short connectots(s)
(RED) to the airbag(s) (see page 23-272).
2. Connect Test Harness B between the SRS unit and
A
B
SRS main harness 18-P connector.SRS UN]T'...SRS MAIN HARNESS18.P CONNECTOR
3. Reconnect the driv€r's airbag connector, then check
continuity between the B1 terminal and body
ground, and b€twesn the 87 terminsl and body
grounq,
TEST HABT{ESS B
. lf there is continuity at either terminal, go to step
o.
. lf there is no continuity at sither terminal'
- go to step 5 (without front passonge/s airbag)'
- go to step il (with front passenger's airbag)'
Reconnect the front passonger's sirbag connector,
then check continuity betwo€n ihs 82 t€rminal and
body ground, and between the 88 terminal and
body ground.
lf there is continuity at either terminal, go to step
10.
lf there is no continuity at either terminal, go to
step 5.
lSAOHvcc58saoc10BUCI12Gto13toct4
4,35.65.512.O- 14.35,6-7.311.5- 14,5oa_5-13.68.:aro.9
2.43.74.55.5
't2.o
14.33.74.911,5-14.5o2.O-8.58.4-r0.9
o4.55,512.O- 14.3o11.5-14,5o2.O-8.58./a-r0.9
4.6-11.3-5.512.O- 14.311.2- 14.611.514,5o2.O8./t-r0.9
5.74.5t2.o14,3-9.7tt.5- 14_5o-8.58.1-10.9
4.611.34.5- 5.512.0- 14.33.7-4.91t.514.5o2.O-8.5a.a-r0.9
4.3oo5,6-7.311.514,5o2,O8.it,r0.9H ll{o. 26 lo Al o.
4.3-5.64.5-5.512.O- 14.3-7.3t1.5- 14-5oo ta,5- 13.0tE,4-10.9
23-284

Check continuity between body ground and eachterminal of both dssh sensors.
TEST HARNESS Bo?MAZ - SFmSd)
. lf there iscontinuity at anyof theterminals, go tostep 12.
. lf thsre is no continuity at any terminal, go tosteo 13.
Disconnect the cable reel 6-p connector from theSRS main harn€ss, then connect Test Harness Conly to the cable reel side of the 6-p connector.
CABLE NEEL &P CONNECTOR
7.Check continuity between the No. 4 terminal andbody ground, and between the No. 5 terminal andbody ground.
TEST HABI{ESS C07LAiZ - SLIO:loo
lf there is continuity at either terminal, go to step8.
lf there is no continuity at either terminal, theSRS main harness is faulty. Replace it and re_chsck the voltages according to the chart onpage 23-283.
(cont'd)
23-285