ac circuit HONDA INTEGRA 1994 4.G Workshop Manual

SRS INOICATOF CIRCUITlln lh6 grugo .$.mblyl
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Gircuit Diagram (With Front Passenger's Airbagl
UNOE8- DASHFUSSRELAY BOX
DRIVER'SAIREAGINFI.A]OR
FROI.ITPASSENGER'SAIREAGINFLATOR
UNDERHOODFUSE/REI.AY80x
SRS UNIT l8-P COI'INECTOR
23-269

Supplemental Restraint System (SRSI
Wiring Locations
CAUnON: Make sure all SRS ground locrtion3 lrc clrln rnd ground3 tra |.curalv rltachad.
NOTE:
o Alt SRS electricsl wiring harnesses are covered with ysllow insulation.
. RsDlace the entire affected SRS harness assembly if it has an open circuit or damaged wiring.
CABIE REEL to DdrrEFS AnaAC3+ OOI{iECTOR
DASHBOARD WIRE HARNEi9to INDICATOB UGHT in GAUGE ASSEMBLY
5-P CONNECTOBaFs irA[t H^RiEssto FROiIT PASSEMIEFS Ana G3t coftf'Eclon
SRS MAIN HARNESS tO
MAIN WIRE HARNESS+P OONNECTOR
C. b Ra nod.ll
SnS Alt{ ll^ntc8s too sH SErson2+ OOt{tlEcT()R
SRS MAIN HARNESSto UNDER-DASHFUSE/RELAY BOX2"P @NNECTOR
MAIN WIRE HARNESSto DASHBOARD WIREHARNESSlGP CONNECTOR
SBS MAIN HARNESS toLEFT DASH SENSOR2.P CONNECTOA
23-270

- Dash sensors- Cable reel- SRS unit
General Precautions
Carefully inspect any SRS part before you install it.Do not install any part that shows signs of beingdropped or improperly handled, such as dents, cracksor deformation:
- Airbag assembly {driver's and front passenger's)
Airbag Handling and Storage
Do not try to disassemble the airbag assembly. lt has noserviceable parts. Once an airbag has been operated(deployed), it cannot be repaired or reuseo.
For temporary storage of the airbag assembly duringservice, please observe the following precautions:
. Store the removed airbag assembly with the pad sur-face up.
!@ It the airbag is impropsrty stored facsdown, accidental deployment could propel the unit withenough force to cause setious iniury
Store the removed airbag assembly on a secure flatsufface away from any high heat source (exceeding
212"Fl1OO'Cl and free of any oil. grease, detergent or
CAUTION: lmproper handling or storage can internallydamage the airbag assembly, making it inoperativ€.ll you suspect the airbag assembly has been damagod,install a new unit and rgler to the Deployment/DigposalProcedures lor disposing of the dsmaged airbag.
Use only a digital multimeter to check the system. lfit's not a Honda multimeter make sure its output is 10mA (0.01 A) or less when switched to the smallestvalue in the ohmmeter range. A tester with a higheroutput could damage the airbag circuit or cause accidental deployment and possible injury.
Do not install used SRS parts from another car. Whenmaking SRS repai.s, use only new pans.
Except when performing electrical inspections,always disconnect both the negative cable and posi-
tive cable at the battery before beginning work.
Replacement of the combination light andwiper/washer switches and cruise control switch canbe done without removing the steering wheell
- Combination light and wiper/washer switchreplacement (see page 23-160).- Cruise control sevresume switch replacement {seepage 23-2491 .
The original radio has a coded theft protection circuit.Be sure to get the customer's code number beforedisconnecting the battery.
When reinstalling the SRS unit cover, be sure it snapstogether properly.
SHORT CONNECTON {REDI
23-271

Supplemental Restraint System (SRSI
Wiring Precautions
o Never attempt to modify. splice or repair SRS wiring.
NOTE: All SRS electrical wiring harnesses are covered
with yellow insulation.
Be sure to install the harness wires so that they are
not pinched or interfering with other car pans.
Make sure all SRS ground locations are clean and
grounds are securely fastened for optimum metal-to-
metal contact. Poor grounding can cause intermittent
problems that are difficult to diagnose.
23-272
Connecting the Short Connectors
@ To avoid accident8l deploymont and pos-
5ibl6 iniury, slways insiall the protectiva short connec-
tor(s) on tho drivgr'3 and passengor's airbag connec.
tor(s) be{ore working noar any SRS wiring.
NOTE: The original radio has I coded theft protection
circuit. Be sure to get the customer's code number
before disconnecting the battery cables.
1. Disconnect the battery negative cable. then discon-
nect the Dositive cable.
2. Connect the short connector(s) {RED):
Driver's Side:
. Remove the access panel from the steering wheel.
then remove the short connector (RED) from the
Daner.
DRIVER'SAIRBAG
CONNECTORIREDI
Disconnect the 3-P connector between the driver's
airbag and cable reel, then connect the short connec-
tor {RED} to the airbag side oi the connector.

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

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

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

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.
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23-284

Supplemental Restraint System (SRS)
Troubleshooting (cont'd)
Modg C: Shon in one cowl son3ol, or open in both dash
sensors
Mode D: Open in ono da3h sensol
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 connector(s)
to the airbag(s) (see page 23'2721.
2. Connect Test Harness B between the SRS unit and
SRS main harness 18-P connector.
23-2AA
3. Measure the resistance between the left dash sen-
sor terminals 812 and 816, and between the right
dash sensor terminals 84 and 86.
lf resistance is more than 5 kO for eiiher set of
terminals, go to step 4.
lf resistance is less than 5 kO tor both sets of ter-
minals, the SRS unit is faulty. Substitute a
known-good SRS unit and recheck the voltages
according to the chart on page 23-283.

4.Connect T6st Harness D between the dash sensor
and SRS main harness 2-P connector.
Measure the resistance between the No. 1 terminal
and No. 2 terminal.
SBS MAINHARNESS2-P COI{NECTOR
TESTHARNESS DorlA:a - sl{tarx)
TEST HARI{ESS DOTLAZ - sl/to4{lo
lf resistance is more than 5 kO, the dash sensor is
faulty. Replace the dash sensor and recheck the
voltages according to the chart on page 23-283.
lf resistance is less than 5 kO, the SRS main har-
ness is faulty. Replace rhe SRS main harness and
recheck the voltages according to the chart onpage 23-283.
Mode E: Op€n in driver's airbag inflator or cable reel
NOTE: The original radio has a coded theft protection
circuit. Be sure to get the customer's code number
before disconnecting the baftery cables.
Disconnect the battery negative cable and then thepositive cable. Then connect the short connector(s)(RED)to the airbag(s) (see page 23-272).
Connect Test Harness I between the SRS unit and
SRS main harness l8-P connector.
sRs uNtt
Reconnect the driver's airbag connector, then mea-
sure the resistance between the 81 and the 87 ter,mr na ls.
TEST HARNESS Bo?MAZ - SP00500
lf resistance is more than 0.2 kO, go to step 4.
lf resistance is less than 0.2 kO, the SRS unit isfaulty. Substitute a known-good SRS unir andrecheck the voltages according to the chan onpage 23-283.
(cont'd)
23-289
; r.il M
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