1999 HONDA CIVIC wire

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Troubleshooting
t)
Self-diagnostic Procedures
The self-diagnostic function of the SRS system allows it to locate the causes of system problems and to store this informa' I
tion in memory. For easier troubleshooting, this data can be retrieved via a data link circuit l
. When you turn the ignition switch ON (ll), the SRS indicator will come on. ll it goes off after six seconds. the system is
norma l.
. lf there is an abnormality, the system locates and defines the problem, stores this information in memory, and turns
the sRS indicator light on. The data will remain in the memory even when the ignition switch is turned off or if the bat-
tery is disconnected.
o when you connect the scs service connector to the service check connector (2P), and turn the ignition switch oN (ll),
thesRsindicator|ightwi||indicatethediagnostictroub|ecode(DTC)bythenumberofb|inks.
. After reading and recording the DTC. proceed with the troubleshooting for this code'
Precauiions
.Useon|yadigita|mU|timetertocheckthesystem'|fit,snotaHondamu|timeter,makesureitsoutputisl0mA(0.01A)
or|esswhenSwitchedtothesma||estva|ueintheohmmeterrange,AtesterwithahigheroUtpUtcoulddamagethe
airbag circuit or cause accidental airbag deployment and possible injury'
r when-ever the ignition switch is oN (ll). or has been turned oFF for lessthan three minutes, be careful nottobumpthe
SRS unit; the airbags could accidentally deploy and cause damage or injuries
. Before you ,"n1ou" th" SRS main harness, disconnect the driver's airbag connector (and the front passenger's airbag
connector).
. Make sure the battery is sufficiently charged {see section 23}. lf the battery is dead or low, measuring valLles won t be
correct.
. Do not touch a tester probe to the terminals in the sRS unit or harness connectors, and do not connect the terminals
with a jumper wire. Use only the backprobe set or the special tools'
For backprobing spring-loaded lock type connectors, refer to page 24-9'
Reading the DTC
when the SRS indicator light is on, read the DTC using one of these methods:
A. Connect the Honda PGM Tester to the 16P Data Link Connector {DLC), and follow the tester's prompts lf the tester
indicatesnoDTc,DTcg-1orDTc9-2,doub|e-checkbyjumpingtheservicecheckconnectorandwatchingthesRS
indicator light (see next Page)
HONDA PGM TESTER
DATA LINK CONNECTOR Il6PI
l,
24-13

)Erasing the DTC Memory
To erase the DTC(s) from the SRS unit, use a Honda
PGM Tester (see the Honda PGM Tester SRS vehicle
System Supplement) or the following procedure
1. Make sure the ignition switch is OFF
2. Connect the SCS service connector to the MES con-
nector (2P). Do not use a jumper wlre.
]P,
&
.!--J
MEMORY ERASE
SIGNAL (MESI CONNECTOR I2PI
IGRY, GRYI or [GRN, GRNI
SCS SERVICE CONNECTORo?PAZ - 0010100
t
7.
Turn the ignition switch ON (ll).
The SRS indicator light comes on for about six sec-
onds and goes off. Remove the SCS service connec-
tor from the MES connector (2P) within four seconds
after the SRS indicator light went off.
The SRS indicator light comes on again. Reconnect
the SCS service connector to the lvlES connector
(2P) within the four seconds after the SRS indicator
light comes on.
The SRS indicator light goes off. Remove the SCS
service connector from the MES connector (2P)
within four seconds.
The SRS indicator light indicates that the memory is
erased by blinking two times.
Turn the ignition switch OFF, and wait for ten sec-
onos.
8.
SRS indictlorlighi
MESconncclottcaminals
CONNECTED
O,
DISCONI{ECTED
24-15
Troubleshooting Intermittent
Failures
lf there was a malfunction, but it doesn't recur, it will be
stored in the memory as an intermittent failure, and the
SRS indicator light comes on.
Afte. checking the DTC, troubleshoot as lollows:
1. Read rhe DTC {see "Reading the DTC"}.
Erase the DTC memory (see "Erasing the DTC
Memory").
With the shifi lever in neutral, turn the ignition switch
ON (ll), and lei the engine idle.
The SRS indicator light comes on for about six sec-
onds and goes off.
l*F
ON
tl-- -l
Shake the wire harness and the connector, take a test
drive (quick acceleration, quick braking, cornering),
and turn the steering wheel fully left and right, and
hold it there for five lo ten seconds to find the cause
of the intermittent failure.
lf the problem recurs, the SRS indicator light will
stay on.
-q 6a.c f'-
:q
Problem recurs, light stays on
3.
4.
6.lf vou can't duplicate the intermittent failure, the sys-
tem is OK at this time.

l
Diagnostic Trouble Code (DTG) Chart -'96 - 97 Models
t
SRS indicator lightDTCPossible causeCorrectiv6 actionSae page
doesn't come on
none(doesn't
come on)
Faulty SRS indicator light circuitTroubleshooting24-26
comes on
none *4
(doesn't
go off)
Faulty SRS indicator light circuit, internal
failure of SRS unit, faulty SRS power supply.
Troubleshooting
24-29
1-1Open in the driver's airbag inflator24-42
lncreased resistance in the driver's aarbag
inflator24-42
l-3Short to another wire in the driver's airbag
inflator or decreased resistance
Short to Dower in the driver's airbag inflator
Short to ground in the driver's airbag inflator
24-44
1-424-46
1-524-48
2-1
With front passenger's airbag:
Open in the passenger's airbag inflator
Without front Passenger's airbag:
ODen in the dummy resistor
24-50
24-54
With front passenger's airbag:
Increased resistance in the passenger's airbag
inflator
Without front Passenger's airbag:
lncreased resistance in the dummy resistor
24,50
24-54
2-3
With front passenger's airbag:
Shon to another wire in the passenger's
airbag inflator or decreased resistance
Without tront passenger's airbag: Troubleshooting
Short to another wire in the dummy resistor
or decreased resistance
24-52
24-59
2-4
With front passenger's airbag:
Short to power in the passenger's airbag
inJlator
Without front Passenger's airbag:
Short to power in the dummy resistor
24-54
24-60
With front passenger's airbag:
Short to ground in the passenger's aarbag
inflator
without front passenger's airbag:
Short to ground in the dummy resistor
24-56
24-61
(cont'd)
24-17
a,

)Diagnostic Trouble Code (DTC) Chart -'98 - 00 Models
NEC SRS Unit
Ir
SRS indicator lightDTCPossible causeCorrestive actionSee page
doesn't come on
none
(doesn't
come on)
Faulty SRS indicator light circuitTroubleshooting24-26
comes on
none*3
(doesn't
go off)
Faulty SRS indicator light circuit, internal
fallure of SRS unit, faulty SRS power supply
(VB line)
Troubleshooting24-34
No DTC*3(lis ht
comes on
after self-
diagnosis)
Faulty SRS power supply (VA linelTroubleshooting24-39
l-1Open in the driver's airbag inflator
Troubleshooting
24 42
Increased resistance in the driver's airbag
inflator24-42
Short to another wire in the driver's airbag
inflator or decreased resistance24-44
't -4Short to power in the driver's airbag inflator24-46
t-5Short to ground in the driver's airbag inflator24-48
With front passenger's airbag:
Open in the passenger's airbag inflator
Without front passenger's airbag:
Open in the dummv resistor
24-50
24-54
With front passenger's airbag:
Increased resistance in the passenger's airbag
inflator
Without front passenger's airbag:
Increased resistance in the dummy resistor
24-50
24-58
with front passenger's airbag:
Short to another wire in the passenger's
airbag inflator or decreased resistance
Without front passenger's airbag:
Short to another wire in the dummy resistor
or decreased resistance
Troubleshooting
24-52
24,59
2-4
With front passenger's airbag:
Short to power in the passenger's airbag
inflator
Without front passenger's airbag:
Shon to power in the dummy resistor
24-54
24-60
With front passenger's airbag:
Short to ground in the passenger's airbag
inflator
Without front passenger's airbag:
Short to ground in the dummy resistor
24-56
24-61
(cont'd)
24-19
l,

)r
l,.l
I
KEIHIN SRS Unit
SRS indicator lightDTCPossible cau3eCorrective astionSee page
doesn't come on
none
(doesn't
come on)
Faulty SRS indicator light circuitTroubleshooting24-26
comes on
none*3
(doesn't
go offl
Faulty sRs indicator light circuit, internal
failure of SRS unit, faulty SRS power supply
{VB line)
Troubleshooting24-34
Open in the driver's airbag inflator
Troubleshooting
24-42
1-2Increased resistance in the driver's airbag
inflator24-42
1-3Short to another wire in the driver's airbag
inflator or decreased resistance24-44
1-4Short to power in the driver's airbag inflator24-46
1-5Short to ground in the driver's airbag inflator24-44
2-1Open in the passenger's airbag inflator
Troubleshooting
24-50
Increased resistance in the passenger's airbag
inflator24-50
Short to another wire in the passenger's
airbag inflator or decreased resistance24-52
2-4Short to power in the passenger's airbag
inflator24-54
Short to ground in the passenger's airbag
inflator24-56
(cont'd)
24-21

)r
l-J
SIEMENS SRS Unit
SRS indicator lightDTCPossible cause Corregtive astionSee page
doesn't come on
none(doesn't
come on)
FaulW SRS indicator light circuitTrou bleshooting24-26
comes on
none*3
(doesn't
go ofl)
Faulty SRS indicator light circuit, internal
failure of SRS unit, faulty SRS power supply
{VB line)
Troubleshooting24-34
1-1Open or increased resistance in the driver's
airbag inflator
Troubleshooting
24,42
1-3Short to another wire in the driver's airbag
inflator or decreased resistance24-44
1-4Short to power in the driver's airbag inflator24-46
Shon to ground in the driver's airbag inflator24 48
2-1Open or increased resistance in the passengers
airbag inflator
Troubleshooting
24-50
2-3Short to another wire in the passenger's
airbag inflator or decreased resistance24-52
2-4Short to power in the passenger's airbag
inflator24-54
2-5Short to ground in the passenger's airbag
inflator24-56
,-. ^
l) t (cont,d)
24-23
d

SRS Indicator Light Wire Connections
SRS Indicator Light Power Circuit
DASHBOARD WIRE HARNESS
To UNDER-DASHFUSE/RELAY BOX -
20P CONNECTOR
SRS Indicato. Light Control Circuit
To SRS UNIT
tI
SRS MAIN HARNESS
C41 1, C412 : Terminal sido of mdlo t6rminalsC501, C5O2, C508, C801. C802, C807 : Wi.6 sidc of fomalo t.rminals
MAIN WIBE HARNESS
BLU
C508 -+ To GAUGE ASSEMBLY
c41 1
To GAUGE ASSEMBLY
at
C501 : DASHBOARDWIRE HARNESS 2oP CONNECTORC508 : DASHBOARD wlRE HARNESS 5P CONNECTORC801 : SRS MAIN HARNESS 2P CONNECTORC807 : SRS MAIN HARNESS 18P CONNECTOR
C802 : SRS MAIN HARNESS 3P CONNECTORC412 : MAIN WIRE HARNESS 3P CONNECTORC41 1 : MAIN WIRE HARNESS 24P CONNECTORC502 : DASHBOARD WIRE HARNESS 24P CONNECTOR
GRY
OI
24-25

Troubleshooting
The SRS Indicator Light Doesn't Come On
CAUTION: Whonever ths ignition switch is ON {ll}, or
has been turned OFF tor less than three minutes. be
careful not to bump the SRS unit; the airbagls) could
accidentally deploy .nd caus6 damage or iniuri€s.
Check tho pow€r supply (fuse):
Turn the ignition switch ON (ll), and check whether the otherindicator lights come on (brake system, etc.).
Oo the other indicator liohts como on?
YESNO
Check th6 fuso:Check the No. 25 {7.5 A) fuse in the under-dash tuse/relayb"t
ls th6 tu36 OK?
NOYES
Check the bulb:Replace the No. 25 (7.5 A) fuse, and check that theSRS indicator light comes on.
Doos the SRS indicator liqhl come on7
I YES No
END
Check tho wire harns b€twecn fus6 and gauge aasambly:Check for an open in the wire harness between luseNo. 25 {7.5 A) and the gauge assembly, and repair. Checkthat the SRS indicator light comes on.
Doo. tho SRS indic.tor light como on?
I yEs No
I
END
Check tho SRS indicator light bulb:1. Turn the ignition switch OFF.2. Remove the gauge assembly.3. Check for blown SRS indicator light butb.
ls the SRS indicator light bulb OK?
NOYES
Ch.ck the SnS indicator liglrt circuit:Replace the bulb, and reconnect the gauge assemblyconnectors. Then turn the ignition switch ON {ll}.
Ooes th6 SRS indicato. llght come on?
I YEs No
:ND
lAl To page 24-27
24-26
lB'J fo page 24-27
))
No. 25 (7.5 Al FUSE