1999 HONDA CIVIC Srs

Troubleshooting
SRS Unit ldentification
+: On '98 - 00 models, the troubleshooting procedures are different for each type of SRS unit. ldentifv the SRS unit in thevehicle using the chart below, then follow the proper flowchan in the following pages.
'98 - 00 Model SRS units
MAKERIDENTIFICATION
MARK*Remark
NECM1Driver's airbag only
M1Driver's & Passenger's airbags
KEIHINM2Driver's & Passenger's airbags
SIEMENSM3Driver's & Passenger's airbags
'96 - 97 Model SRS units
LABEL IIDENTIFICATION MARK)
MAKERPARTS NUMBERRemark
NEC77960-S04-C81Driver's airbag only
77960-S04-N81Driver's & Passenger's airbags
TAKATA77960-S04-N82Driver's & Passenger's airbags
SIEMENS77960-S02-A81Driver's & Passenger's airbags,'97 Model only
24-16
lr

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,

Troubleshooting
Diagnostic Trouble Code (DTCI Ghart -'96 - 97 Models (cont'd)
NOTE:* l: In case of an intermittent failure DTC g-1, it means there was an internal failure of the SRS unit or a faultv SRS indicator light circuit. Do the troubleshooting for intermittent failures (see page 24-15).*2: lt both DTC 9-2 and DTC 5-1 are indicated, do the troubleshooting for DTC g-2.*3: Apply to the '97 model coupe HX and DX.*4: DTC cannot be read with a Honda PGM Tester; check by jumping the SCS service connector.
24-18
.
Possiblg cause Cortestive action
5 3 I Internal failure of the SRS unitSRS unit
replacement
lnternal failure of the SRS unitSRS unit
replacement
Internal failure of the SRS unit
Internal failure of the SRS unitSRS unit
replacement
Internalfailure of the SRS unit ortwo failures at atime
8-6*3 Internalfailure ofthe SRS unit
Internal failure of the SRS unit
Faulty SRS power supply (VB line)
SRS unit replacement code (SRS unit must not
be used any longe.)
J

)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,

Troubleshooting
Diagnostic Trouble Code (DTC) Chart -'98 - 00 Models {cont'dl
NOTE:* 1: In case of an intermittent failure DTC 9-1, it means there was an internal failure of the SRS unit or a faulty SRS indica-
tor light circuit. Do the troubleshooting for intermittent failures (page 24-'15).*2: In case of an intermittent failure DTC 9-2, it means there was an internal failure of the power supply {VB line). Do the
troubleshooting for intermiftent failures.*3: DTC cannot be read with a Honda PGM Tester; check by jumping the SCS service connector.
24-20
\
SRS indicator lightDTCPossible causeCorrectiYe actionSee page
comes on
5-1lnternal failure of the SRS unitSRS unit
replacemenl24-765-4
6-1
lnternal failure of the SRS unitSRS unit
replacement24-7 66-2
o-5
6-4
7-1
lnternal failure of the SRS unitSRS unit
replacement24-76
7-3
8-1lnternal failure of the SRS unitSRS unit
reptacement24-7 68-2
8-6Internal failure of the SRS unit or two failures
at a trmeTroubleshooting24-62
g_1*r *3lnternal failure of the SRS unitSRS unit
replacement24-7 6
9-2+2 *3lnternal failure of the SRS unit5l|5 Untr
replacement24-76
10-1SRS airbags deployed (SRS unit must be
reDlaced)
SRS unit
replacement24-76

)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

Troubleshooting
Diagnostic Trouble Code (DTCI Ghart -'98 - 00 Models (cont'd)
NOTE:*l: In case of an intermittent failure DTC 9-1. it means there was an internal failure of the SRS unit or a faultv SRS indica-
tor light circuit. Do the troubleshooting for intermiftent failures (pa9e 24-15).*2: In case of an intermittent failure DTC 9-2, it means there was an internal failure of the power supply (VB line). Do thetroubleshooting for intermittent failures.*3: DTC cannot be read with a Honda PGM Tester; check by jumping the SCS service connector.
SRS indicator lightDTCPossible causeCorective actionSeo page
comes on
5-2
53
54
lnternal failure of the SRS unitSRS unit
replacement24-7 6
6-1
6-2
_
64
Internal failure of the SRS unitSRS unit
replacement24-16
n
-
8l
8S
9_1*r *3
Internal failure of the SRS unitSRS unit
reptacement24-76
Internal failure of the SRS unitSRS unit
replacement24-76
Internal failure of the SRS unitSRS unit
replacement24-76
Internal failure of the SBS unitSRS unit
reptacemenr24-76
10-1SRS airbags deployed (SRS unit must be
reDlaced)
SRS unit
replacement24-76
24-22

)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