1999 HONDA CIVIC Power

Description
)
The sRS is a safety device which, when used in coniunction with the seat belt, is designed to help protect the driver land
front passenger) in a frontal impact exceeding a certain set limit. The system consists of the sRS unit {including safing
sensor and impact sensor), the cable reel, the driver's airbag (and front passenger's airbag)
FRONT PASSENGEB'SAIRAAG
DRIVER'S AIRBAG
CABLE REEL
SRS UNtT
t
Operation
The main circuit in the SRS unit senses and judges the force of impact and, if necessary, ignites the inflator charge(s) lf
battery voltage is too low or power is disconnected due to the impact, the voltage regulator and the back-up power clrcult
resoectivelv will keep voltage at a constant level.
For the SRS to operate:
(1) The impact sensor must activate. and send electric signals to the mlcroprocessor'
(2) The microprocessor must compute the signals' and must send signals to the airbag inflator(s)'
{3) The inflator(s) must ignite and deploy the airbag(s)'
_"-_-l
Ir3B!#h i
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Self-diagnosis System
A self-diagnosis circuit is built into the SRS unit; when the ignition switch is turned ON (ll), the SRS indicator light comes
on and goes off after about six seconds if the system is operating normally
lf the liglt does not come on, or does not go off after six seconds, or if it comes on while driving, it indicates an abnormal-
ity in the system. The system must be inspected and repaired as soon as possible
For better serviceability, the memory will store the cause of the malfunctlon, and the data link circuit passes on the infor-
mation from the memory to the data link connector (DLC). This intormation can be read with the Honda PGM Tesler con-
nected to the DLC (16P).
l,
24-5

Preca utions/Procedures
Spring-loaded Lock Connector
Some SRS system connectors have a spring-loaded lock.
Disconnecting
To release the lock, pull the spring-loaded sleeve towardthe stop while holding the opposite half of the connecror.Then pull the connector halves apart.
NOTE: Be sure to pull
connector half.
on the sleeve and not on the
SPRING-LOADEOSLEEVE
Do not pull on thishalf of the connector.
Connecting
1. Hold the pawl-side connector half, and press on theback of the sleeve-side connector half in the directionshown. As the two connector halves are pressed
together, the sleeve is pushed back by the pawl.
NOTE: Do not touch the sleeve.
When the connector halves are completely connected,the pawl is released, and the spring-loaded sleevelocks the connector.SPRING.LOADEDSLEEVE
24-10
Spring-loaded Lock Connector with
Built-in Short Contact
The driver's ajrbag (and front passenger,s) airbag has(have) a spring-loaded lock connector with a builr-inshort contact. When this connector is disconnected, thepower terminal and the ground terminal in the airbaaconnector are automatically shoned.
Connector halves disconnected:
SHORT CONTACT
Conneqtor halves connected:
GROUND TERMINAL
CABLE REEL CONNECTOR
GROUND TERMINAL

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