Circuit HONDA CR-V 1999 RD1-RD3 / 1.G Workshop Manual

Troubleshooting
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-
tion in memory, For easier troubleshooting, this data can be retrieved via a data link circuit.
. When you turn the ignition switch ON (ll). the SRS indicator will come on. lf it goes off after six seconds, the system is
normal.
. lf there is 8n 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-
terv is disconnected.
. When you connect the SCS service connector to the service check connector (2P), and turn the ignition switch ON (ll),
the SRS indicator light will indicate the diagnostic trouble code (DTC) by the number of blinks.
. After reading and recording the DTC, proceed with the troubleshooting forthis code.
Precsutions
. Use only a digital multimeter to check the system. lf it's not a Honda multimeter. make sure its output is 10 mA (0.01 A)
or less when switched to the smallest value in the ohmmeter range. A tester with a higher output could damage the
airbag circuit or cause accidental airbag deployment and possible injury.
. Whenever the ignition switch isON (ll). or has been turned OFF for less than three minutes, be careful nottobumpthe
SRS unit; the airbags could accidentally deploy and cause damage or injuries.
. Before you remove the SRS main harness, disconnect the airbag and tensioner connectors (see page 24-23).
. Make sure the battery is sufficiently charged (see section 23). lf the battery is dead or low, measuring values 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 and the SCS service connector.
For backprobing spring-loaded lock type con nectors, .efet to page 24-22.
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
indicates no DTC, DTC 9-1 and DTC 9-2, double-check by jumping the service check connector (2P) and watching the
SRS indicator light (see next page).
HONDA PGM TESTER
DATA LINK CONNECIOR {DLCI {16P)
24-26
,1
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jIDiagnostic Trouble Code (DTG) Ghart -'97 model
SRS indicator lightDTCPos3ibls causeCorroctive actionSlc pago
doesn't come onnone(doesn't
come on)
Faulty SRS indicator light circuitTroubleshooting24-34
doesn't go off
none*'(doesn't
go off)
Faulty SRS indicator light circuit, internal
tailure of SRS unit, faulty SBS power supplyTroubleshooting24-37
Open in the driver's airbag inflator
Troubleshooting
24-50
Increased resistance in the driver's airbag
inflator24-50
Short to another wire in the driver's airbag
inflator or decreased resistance24-52
Short to power in the driver's airbag inflator24-54
Short to ground in the driver's airbag inflator24-56
Open in the passenger's airbag inflator
Troubleshooting
24-58
Increased resistance in the passenger's airbag
inflator24-54
Shon to another wire in the passenger's
airbag inflator or decreased resistance24-60
2-4Short to power in the passenger's airbag
inflator24-62
2-5Shon to ground in the passengar's airbag
inflator24-64
)r,(cont'd)
24-29
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Troubleshooting
Diagnostic Trouble Code (DTC) Chart -'97 model (cont'dl
*1: 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 intermittent failures {see page 24-28),*2: DTC cannot be read with a Honda PGM Tester; check by jumping the SCS service connector.
NOTE: Before troubleshooting DTCS 5-1 through 8-5, check battery/system voltage. lf voltage is low. repair the chargingsystem before troubleshooting the SRS system.
l*
SRS indicator lightDTCPossible causeCorrestive actionSee page
doesn't go off
Internal failure of the SRS unitSRS unit replace-
ment24-965-3
5-4
5-5
o-l
Internal failure of the SRS unitSRS unit replace-
ment24-966-2
6-4
lnternal failure of the SRS unitSRS unit replace-
ment24-967-2
7-3
8-1
Internal failure of the SBS unitSRS unit replace-
menr24-96a-2
8-5
8-6Internal failure of the SRS unit or two failures
at a timeTroubleshooting24-82
Internal failure of the SRS unitSRS unit replace-
menr24-96
9-2Faulty SRS power supply (VB line)Troubleshooting24-84
'10- 1SRS airbags deployed (SRS unit must be
replaced)
SRS unit replace-
ment24-96
24-30
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);Diagnostic Trouble Code (DTCI Chart -'98 - 00 models
SRS indicator lightDTCPossibls causeCorrectiva agtionSee page
doesn t come onnone
(doesn't
come on)
Faulty SRS indicator light circuitTroubleshooting24-34
doesn't go off
none*3
{doesn'tgo off)
No DTC
(light comes
on after self-
diagnosis)
Faulty SRS indicator light circuit. internal
failure of SRS unit, faulty SRS power supply
(VB line)
Troubleshooting24-42
Faulty SRS power supply (VA line)Troubleshooting24-47
1-1Open in the driver's airbag inflator
Troubleshooting
24-50
lncreased resistance in the driver's airbag
inflator24-50
1-3Short to another wire in the driver's airbag
inflator or decreased reslstance24-52
1-4Short to power in the driver's airbag inflator24-54
1-5Short to ground in the driver's airbag inflator24-56
2-1Open in the passenger's airbag inflator
Troubleshooting
24-54
Increased resistance in the passenger's airbag
inflator24-58
Shon to another wire in the passenger's
airbag inflator or decreased resistance24-60
2,4Short to power in the passenger's airbag
inflator24-62
Short to ground in the passenger's arrbag
inflator24-64
3-1Open in the driver's seat belt tensioner
Troubleshooting
24-66
3-2lncreased resistance in the driver's seat belt
tensroner24-66
Shon to another wire in the driver's seat belt
tensroner24-64
3-4Short to power in the driver's seat belt tensioner24-10
Short to ground in the driver's seat belt tensloner24-7 2
4-1Open in the passenger's seat belt tensioner
Troubleshooting
24-14
Increased resistance in the passenger's seat
belt tensioner24-7 4
4-3Short to another wire in the passenger's seat
belt tensioner24-7 6
4-4
4-5
Short to power in the passenger's seat belt ten-
sroner24-74
Shon to ground in the passenger's seat belt
tensroner24-AO
)-(cont'd)
24-31
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Troubleshooting
SRS indicator lightDTCPo$ibla causeCorroctive lctionSec pag€
doesn't go off
5-l
Internal failure of the SRS unitSRS unit replace-
ment24-96
5-4
6-1
lnternal failure of the SRS unitSRS unit replace-
ment24-966-3
6-4
Internal failure of the SRS unitSRS unit replace-
ment24-96
8-1
Internal failure of the SRS unitSRS unit replace-
ment24-96
8-2
8-3
8-4
8-6
Internal failure of the SRS unitSRS unit.eplace-
ment24-969_2*2*3
10- 1SRS unit replacement code (SRS unit must notbe used any longer)SRS unit replace-
ment24-96
Diagnostic Trouble Code (DTC) Chart -'98 - 00 modets (cont,dl
NOTE:*1: In case of an intermittent failure DTC g-1, it means there was an internal failure of the SRS unit or a faulw SRS indica-tor light circuit. Do the troubleshooting for intermittent failures (see page 2,+_2g),*2: In case of an intermiuent fairure DTc 9-2, it means there was an internar fairure of the power suppry (vB rine). Do thetroubleshooting for intermittent failures (see page 24-29).*3: DTC cannot be read with a Honda PGM Tester; check by jumping the SCS servic€ connector.
NOTE: Before troubleshooting DTCS 5-1 through g-6. check battery/system voltage. lf voltage is low, repair the charg_ing system before troubleshooting the SRS system.
l*-
1,.-
\f ..
24-32
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SRS Indicator Light Wire Connections
SRS Indicator Light Power Circuit
DASHBOARD WIRE HARNESS
YEL
BLK
To UNDER-DASHFUSE/RELAY BOX <_
20P CONNECTOR
To GAUGEcsog + assEMBLy
SRS Indicator Light Control Circuit
SRS MAIN HARNESS
)-MAIN WIRE HARNESS
VAIVBIt
To UNDER-DASHFUSE/BELAY BOX2P CONNECTOR
c414MAIN WIRE HARNESS 3P CONNECTORTerminal side of msle t€rminals
c415MAIN wlRE HARNESS 24P CONNECTORTerminal aide of male terminals
c502DASHBOARD WIRE HARNESS 2OP CONNECTORWire side of lemslo terminsls
c503OASHBOARD WIRE HARNESS 24P CONNECTORWire side of female t€rminal3
c509DASHBOABD WIRE HARNESS 5P CONNECTORWire sid€ ot lemale te.minals
c801SRS MAIN HARNESS 2P CONNECTORwire side ol f.male terminals
c803SRS MAIN HARNESS 3P CONNECTORWire side ol female terminals
c806SRS MAIN HARNESS T8P CONNECTORWire side of lomrle terminals
)
24-33
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Troubleshooting
The SRS Indicator Light Doesn't Come On
CAUTION: Whenever the ignition switch is ON D, orhas been turned OFF for less than three minutes, becareful not to bump the SRS unit; the airbags couldaccidentally deploy and cause damage or iniuries.
Ch6ck the power supply (fuse):Turn the ignition switch ON {ll), and check whether the otherindicator lights come on (brake system, e(c.r.
Do the other indicator liglrts com6 on?
Check the No. 25 (7.5 A) fuse in the under-dash tuse/relayDOX.
ls the tus€ oK?
NO
Check the bulb:Replace the No.25 (7.5 A) fuse, and check that theSRS indicator light comes on.
Does the SRS indicator liqht come on?
YESNO
END
YES
Check the wire h.rnesi kwe€n fus€.nd gauge .3sembly:Check for an open in the wire harness between fuseNo. 25 (7.5 Al and the gauge assembly, and repair. Checkthat lhe SRS indicato.lighi
Does the SRS indic.tor liqht com6 on?
END
YESNO
Check the SRS indicator light bulb:1. Turn the ignition switch OFF.2. Remove the gauge assembly.3. Check lor blown SRS indicator tight bulb.
ls the SRS indicator tight bulb OK?
YESNO
Check the SRS indicator light circuit:Replace the bulb, and reconnect the gauge assemblyconneclors. Then turn the ignition switch ON {ll).
Does the SRS indicator light come on?
I YEs No
:ND
(A) To page 24-35(B) To page 24 35
24-34
lr-
lu
-J
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Chock th6 SRS indic.lor light circuit:1. Disconnect the dashboard wire harness 5P connector
from the gauge assembly.2. Connect a voltmeter between the No l terminal (+) o{
the 5P connector and grouncl.
3. Turn the ignition switch ON {ll), and measure voltage
ls thero 8.5 V or lats for 3ix second! aflsr the ignition
switch ha3 bo€n turnod ON (ll)7
YESNO
Fdulty SRS indicator light cilctlit in ths gauge sssomblY;
replaco tho SRS printod circuit board in the gauge
aasombly,
Chock th6 wire harn.$ of the SRS indicstor light circuh (11:
1. Turn the ignition switch OFF.2. Disconnect the main wire harness 24P connector from
the dashboard wire harness-3. Connect a voltmeter between the No 5 terminal (+) of
the ma;n wire harness 24P connecior and ground
4. Turn the ignition ON {ll), and measure voltage.
ls there 8,5 V or l€r3 tor six s€cond3 efter the ignilion
switch has bssn turnod ON llll?
YESNO
Short to powor in the BLU wire of tho dashbosrd wire
harne3s; Epait the harne3.s.
To page 24-36
Jt)
From page 24 34(A)From page 24-34(8)DASHBOARD WIRE HARNESS
5P CONNECTOR
DASHBOARD WIRE HARI{ESS5P CONI{ECTOR
c509
Wire side ol femaleterminals
)_
DASHBOARO WIREHARNESS 24PCONNECfOR
(cont'd)
MAIN WIRE HARNESS
MAIN WIRE HARI{ESS 2/tP COI{ ECTOR
Terminal side of male terminals
24-35
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Troubleshooting
From page 24-35
Check lhe wire harness otthe SRS indicator light circuit l2l:L Turn the ignitjon switch OFF.2. Disconnect the SRS main harness 3p connector from themain wire harness.3. Connect a voltmeter between the No. I terminal (+) ofthe SRS main harness 3P connector and qround.4. Turn the ignition switch ON (ll), and measure voltaqe.
ls there 8.5 V o. less tor six seconds atter the ignitionswitch has been turned ON
Short to power in th€ BLU wire of the main wiro halno3s;
Check th€ wire hahess of th6 SRS indicator ci.cuit {31:1. Turn the ignition switch OFF.2. Disconnect the battery negative cable, then the positivecable, and wait three minutes.3. Disconnect the driver's and front passenger,s airbag con-nectors {and disconnect the seat belt tensioner connectors}(see page 24-23).4. Disconnect the SRS main harness 18p connector from
5. Reconnect the battery positive cable, then reconnect thenegative cable.6. Connect a voltmeter between the No. 6 terminal (+) ofthe SRS main harness 'l8P connector and ground.7. Turn the ignition switch ON (ll), and measure voltage. Thereshould be 0.5 V or less.
Short to power in the BLU wire oI the SRS main harngas;
The SRS Indicator Light Doesn't Come On (cont,dl
'97 modol:
J
MAIN WIRE HARNESS3P CONNECTOR
UNDER.DASHFUSE/RELAY BOX
'98 - 00 models:
SRS MAIN HARN€SS3P CONNECTOR
MAIN WIRE HARNESS3P CONNECTOR
SRS MAIN HARNESS3P CONNECTOR
SRS MAIN HARNESS3P COI{NECTOB
FUSE/RELAY BOX
c803
SRS MAIN HARNESS18P CONNECTOR
24-36
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Check lhe SRS indicalor circuit:
1. Turn the ignition switch OFF
2. Remove the gauge assembly Do not disconnect the
dashboard wire harness 5P connector from the gauge
assemoly.3. Turn the ignition switch ON (ll).
4. Connect tie dashboard wire harness 5P connector termi-
nals No. I and No 5 with a iumper wire.
Does the SRS indicator light 90 otn
Faulty SRS indicator light circuit in the 9aug6 a$embly;
reolace the SRS printod circuit boa.d in th' gauge
Check tor rn open in the SRS indicator light circuit:
1. Turn the ignition switch OFF
2. Disconnect the dashboard wire harness 5P connector
from the gauge assemblY.
3. Check res]sta-nce between the No. 6 terminal ol the SRS
main harness 18P connector and No l terminal ol the
dashboard wire harness 5P connector; there should be
From page 24-38{B)
DASHBOARD WIRE HARNESS5P CONNECTOR
DASHBOARD WIRE HARNESS5P CONI{ECTOR
)
Y;yfivvcsosffi
I BLU IYELWir6.side of femaleJUMPER WIRE lormrna|s
SRS MAI HAN ESSt8P CO I{ECTOR
DASHBOARD WIRE HARNESS5P COI{NECTOR
{D)To page 24-41
1E)To page 24-41
)(cont'd)
Wire side oI fsmale terminals
24-39
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