1998 HONDA CR-V ECU

Five-step Troubleshooting
1.
3.
Verify The Complaint
Turn on all the components in the problem circuit to
verify the customer complaint. Note the symptoms.
Do not begin disassembly or testing until you have
narrowed down the problem area.
Analyze The Schematic
Look up the schematic for the problem circuit.
Determine how the circuit is supposed to work by
tracing the current paths from the power feed
through the circuit components to ground. lf several
circuits fail at the same time, the fuse or ground is a
likely cause,
Based on the symptoms and your understanding of
the circuit operation, identify one or more possible
causes of the problem.
lsolate The Problem By Testing The Circuit
Make circuit tests to check the diagnosis you made
in step 2. Keep jn mind that a logical, simple proce-
dure is the key to efficient troubleshooting. Test for
the most likely cause of failure first. Try to make
tests at points that are easily accessible,
Fix The Problem
Once the specific problem is identified, make the
repair. Be sure to use proper tools and safe proce-
dures.
Make Sure The Circuit Works
Turn on all components in the repaired circuit in all
modes to make sure you've fixed the entire prob-
lem. lf the problem was a blown fuse, be sure to
test all of the circuits on the fuse. lvlake sure no new
problems turn up and the original problem does nol
recur.
4.
O
Wire Color Codes
The following abbreviations are used to identify wire
colors in the circuit schematics:
WHT ............................. White
YEL,.............................. Yellow
BLK ..........,................... Black
BLU .............................. Blue
GRN .............................Green
RED .............................. Red
ORN .............................Oran9e
PNK.....,........................ Pink
BRN .............................. Brown
GRY .............................. Gray
PUR .........,.................... Purple
LT BLU ..................,...... Light Blue
LT GRN ........................ Light Green
The wire insulation has one color or one color with
another color stripe. The second color is the stripe.
WHT/BLK
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Connector ldentification and Wire Harness Routing
Main Wire Harn€ss (left side of dash and floor branchesl {cont,dl
c401
c402
c403
c404
c404
c405
c406
c407
c408
c409
c410
c410
c411
c412
c413
c413
c414
c415
c416
c416
c417
c418
c419
c420
c420
c421
c422
c423
c424
c425
c42A
c426
c437
c438
c438
c439
c440
c441c442
5
20
20
24
't4
8
5
3
12
10'1
18
20'18
10
15
1
4
8
5
5
22
Behind left kick panel
Behind left kick panel
Behind left kick panel
Behind left kick panel
Behind left kick panel
Under left side of dashUnder left side of dashUnder left side of dashUnder left side of dashUnder left side of dashUnder left side of dashUnder left side of dash
Under left side of dashUnder left side of dashUnder left side of dash
Under left side of dash
Under left side of dashUnder left side of dashUnder left side of dashUnder left side of dashUnder left side of dashUnder left side of dashUnder left side of dashUnder left side of dash
Under left side of dashUnder left side of dashUnder left side of dashUnder middle of dashUnder middle of dashUnder middle of dashUnder middle of dashUnder middle of dash
Under left side of dashUnder left side of dash
Under left side of dashUnder left side of dashUnder left side of dashUnder left side of dashUnder left side of dash
Under left side of dash
Under left side of dashUnder left side of dashUnder left side of dashUnder left side of dash
Starter cut relay
Horn relay
Left side wire harness (C558)
Left side wire harness (C559)
Left side wire harness (C559)
Cruise control unitDaytime running lights control unitDaytime running lights control unitlgnition key light control unitInterior wire harness {C701)Cable reel
Cable reel
lgnition key switchlgnition key switch
Combination switch sub-harness {C753)
Combination switch sub-harness (C753)
SRS main harness (C803)
Dashboard wire harness (C503)
Dashboard wire harness (C501)
Dashboard wire harness {C501)Under-dash fuse/relay box (C922)
Under-dash fuse/relay box (C920)
Under-dash fuse/relay box (C919)
lntegrated control unit
Integrated control unitFront fog lights switchBrake switch
Interlock control unitReverse relay
Rear accessory socket relayRear accessory socket relayRear heated oxygen sensor sub-harness (C722)
Security control unitSecurity starter cut relay (for securityalarm system)
Junction connector (for interlock system)Security wire harnessSecurity wire harnessRear window wiper control unitCombination switch sub-harness (C760)
Combination switch sub-harness (C760)
Securlty indicatorSecurity valet switchClutch interlock switchClutch switch (for cruise control)
'97 model'98 - 00mooets
Canada
Canada'97 model
'97 model'98 - 00models
'97 - 98models'99 - 00
moqets
'97 model'98 - 00mooets
Optional
Optional
Optional
Optional
Optional'97 model
'97 - 98mooels'99 - 00models
OptionalOptional
Mfi
Mlr
Under left side of dashBody ground, via main wire harness
23-20
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Connector ldentification and Wire Harness Routing
Left Side Wire Harness
Connector oI
Terminal
Number of
CavitiesLocaiionConnects toNot6s
c551
c552
c554
c556
c558
c559
c559
c560
c562
c563
c563
c564
c565
c566
c568
c569
c570
c572
c573
c57 4
c575
c576
c578
c579
c580
c581
8
16
10
14'I
14
16
20
20
24
)
1
5
1
1
6
1
2
14
1
1
6
1
6
Behind under-dash fuse/relay box
Behind under-dash fuse/relay box
Left side of steering wheel
Left side of steering wheel
Left side of steering wheel
Above under-dash fuse/relay box
Above under-dash fuse/relay box
Driver's door
Behind left kick panel
Behind left kick panel
Behind left kick panel
Left side offloor
Left quaner panel
Fueltank
On left half of rear cross beam
On left half of rear cross beam
Left quarter panel
Left quarter panel
Left quarter panel
Left quarter panel
Left quarter panel
Left quarter panel
On left half of rear cross beam
Right quarter panel
Right quarter panel
Left quarter pillar
Left side of floor
Left B-piller
Left B-piller
Behind left kick panel
Behind left kick panel
Under left side of dash
Left B-piller
Fueltank
Left side of steering wheel
Under-dash fuse/relay box (C921)
Under-dash fuse/relay box (C923)
Power mirror switch
Power window master switch
Power window master switch
Dashboard wire harness {C505)
Dashboard wire harness 1C505)
Driver's door wire harness (C661)
Main wire harness (C403)
Main wire harness (C404)
Main wire harness (C404)
Driver's seat belt switch
Left rear door switch
Fuel unit
Left rear ABS wheel sensor
Left rear ABS wheel sensor
Rear accessory socket connector {+}
Rear accessory socket connector (-)
Rear bumper wire harness 1C641)
Trailer lighting connector
Tailgate door latch switch
Left rear speaker
Right rear ABS wheel sensor
Rear wire harness (C611)
Right rea. door switch
Left taillight
Parking brake switch
Left rear door wire harness (C681)
Driver's door switch
Select unlock relay (for security alarm
system)
Junction connector (for power door
locks)
SRS main harness (C807)
Driver's seat belt tensioner
Fuel tank pressure sensor sub-harness(c645)
Power window master switch
'97 - 98
mooets'99 - 00
models
'97 model'98 - 00
models
Optional
'97 model'98 - 00
models
'98 - 00
mooets'98 - 00
models'98 - 00
mooets'99 - 00
mooets
G551
G553
Behind left kick panel
Left side ot floor
Left quarter piller
Body ground, via left side wire harness
Body ground, via left side wire harness
Body ground, via left side wire harness
23-26
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JFront Seat Belt RePlacement
SRS components are located in this area. Review the SRS
component locations, precautions, and procedures in this
section (24) before performing repairs or service ('98 - 00
models).
CAUTION: Check the front seat bslts for damago. and
replaco thom if necessary. Be careful not to damage
them during removal and in3tallation'
Front scat bolt:
1. Make sure you have the anti-theft code for the
radio, then write down the frequencies for the pre-
set buttons.
2. Disconnect the negative battery cable, and wait at
least three minutes before beginning work.
3. Slide the front seat forward fully.
4. Bemove (see section 20):
. Center pillar lower trim Pane
. Kick oanel
. Front side trim
5. '97 model: Remove the upper anchor cover and the
lower anchor caP.'98 - oO models: Remove the upper anchor cover
and pull the lower anchor cover back.
UPPEN ANCHOR BOLT
7/1&20 UNF32 N.m (3.3 kgt'm.24 tbf.ft)
SHOULDERANCHORADJUSTER
Apply liquid threadlock.
9.8 N.m (1.0 kgt.m,?.2 tbtft)
UPPERCOVER
RETRACTORMOUNTING BOLTZ,,Gx1.0mm ./
SEAT BELTTENSIONER
{'98 - 0o modols)
REAR SIDE
ANCHORCOVERl'98 - 00 models)
ANCHORCAP('97 modell
RETRACTOR BOLT7/1&20 UNF32 N.m 13.3 kgt m,24 tbt.ft)
LOWER ANCHOR BOLT?,/1&20 UNF32 N.m {3.3 kgf.m, 2,1 lbf.ftl
o.Disconnect the seat belt tensiongr connector.
@ To avoid accidontal deployment and
possibte inlury, always disconnect the soat bsh ton-
sion€r connoctor bofore rsmoving th6 retractor l'98
- 00 modsls, se€ pa ge 21-231 .
Remove the uDDer and lower anchor boits, the
retractor bolt, the retractor mounting bolt, and
remove the front seat belt and retractor.
Remove the center pillar upper trim (see section 20).
Remove the shoulder anchor adjuster.
7.
9.
8.
I x 1.25 mm23 N.m 12.3 kgt.m,1? tbf.ft)
SHOULDERANCHORADJUSTER
10. lnstallation isthe reverse of the removal procedure.
NOTE:
Check that the retractor locking mechanism func-
tions as described on Page 24-9.
Assemble the washers, collar and bushing on the
uooer and lower anchor bolts as shown.
Eefore installing the anchor bolts, make sure there
are no twists or kinks in the front seat belt.
Make sure the seat belt tensioner connector ls
connected securelv.
Enter the anti-theft code for the radio, then enter
the customer's radio station presets
(cont'd)
24-3
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Seat Belts
Chifd Seat Tether Anchor Installation -,97 - 99 Models
Canada model:
Attachment points are provided for a rear sear mountedchild restraint system which uses a top tether. The attach_ment points are located on both rear corners of the head_liner, just behind the rear seat-back. When using a childseat with a top tether, install the child seat tether anchorsecurelv.
NOTE: To install a child seat on the rear seat, select theattachment point you want to use, and remove the plugcover from the attachment point of the headliner. Installthe child seat tether anchor securely.
ATTACHMENTPOINTS
PLUG COVERS
CHILO SEATTETHERANCHORTOOTHED WASHER
24-10
-4
NOTE:
. Do not remove the toothed washer from the child seattether anchor. Use the seat anchor with the toothedwasher attached to it.. When installing a child seat on the rear seat, followthe instructions of the manufacturer of the child seat.. Additional anchors are available.
-
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Description
J)
The SRS is a safety device which, when used in conjunction with the seat belt, is designed to help protect the driver and
front passenger in a frontal impact exceeding a certain set limit. The system consists of the SRS unit (including safing sen-
sor and impact sensor), the cable reel, the driver's airbag and front passenger's airbag.
Seat Bolt Tensioner {'98 - 00 models}
The seat belt tensioner is linked with the SRS airbags to further increase the effectiveness of the seat belt. In a front-end
collision, the tensioner instantly retracts the belt firmly to secure the occupants in their seats
FRONT PASSENGER'SAIREAGDRIVER'S AIRBAG
FRONT PASSENGER'SSEAT BELT TENSIONER{'98 - 00 modelsl
)
SRS UNITDRIVER'S SEAT BELTTENSIONER l'98 - 0O modeb)
Operation
The main circuit in the SRS unit senses and judges the force of impact and, if necessary, ignites the intlator charges. lf bat
tery voltage is too low or power is disconnected due to the impact, the voltage regulator and the back-up power circuit
respectively will keep voltage at a constant level.
For the SRS to operate:
(1) The impact sensor must activate, and send electric signals to the microprocessor.
(2) The microprocessor must compute the signals, and send them to the airbag inflators (and seat belt tensioners).
(3) The inflators must ignite and deploy the airbags (and activate the tensioners).
Selt-diagnosis System
A self-diagnosis circuit is built into the SRS uniU when the ignition switch is turned ON (ll), the SRS indicator Iight comes
on and goes off after about six seconds if the system is operating normally.
lf the light does not come on, does not go off after six seconds, or it comes on while driving, it indicates an abnormality in
the system. The system must be inspected and repaired as soon as possible.
For battery serviceability, the memory will store the cause of the malfunction, and the data link circuit passes on the infor
mation from the memory to the data link connector (DLC). This information can be read with the Honda PGM Tester con-
nected to the DLC {16P).
198
---__-l
TENSTO1En II
_-___J- 00 N4ode s)
24-17
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Precautions/Procedures
)General Precautions
Carefully inspect any SRS part before you install it.
Do not install any part that shows signs of being drop-
ped or improperly handled, such as dents, cracks or
deformation:
- Airbags- Cable reel- SRS unit- Seat belt tensioners
N
)-
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 acci-
dental deployment and possible injury.
Do not install used SRS Dans from another vehicle,
When making SRS repairs, use only new pans.
Except when performing electrical inspections,
always disconnect both the negative cable and posi-
tive cable from the batterv. and wait at least three
minutes before beginning work.
Replacement of the combination light and wiper/
washer switches and cruise control switch can be
done without removing the steering wheel:
- Combination light and wiper/washer switch replace-
ment {see section 231.- Cruise control sevresume switch replacement (see
section 41.
Whenever the ignition switch is ON {ll}, or has been
turned OFF for less than three minutes, be careful not
to bump the SRS unit; the airbags could accidentally
deploy and cause damage or injuries.
Whenever the airbag has been activated, replace the
SRS unit.
The original radio has a coded theft protection circuit.
Be sure to get the customer's code number before dis-
connecting the battery cables.
)
Airbag/Seat Belt Tensioner
Handling and Storage
Do not try to disassemble an airbag or a seat belt ten-
sioner. They have no serviceable parts. Once an airbag
or a seat belt tensioner have been deployed. they cannot
be repaired or reused.
For temporary storage of an airbag or a seat belt ten-
sioner during service, please observe the following pre-
cautons:
. Store the removed airbag with the pad surface up.
The driver's/front passenger's airbag connectors and
seat belt tensioner connectors have a built-in short
contact (see page 24-211.
@ r th€ airb.g is impropcrty stor€d face down,
accidental deployment could propel the unit with enough
forc€ to caus6 serious iniury,
Store the removed on a secure flat surface awav from
any high heat source (exceeding 212"F/100'C) and
free of any oil, grease. detergent or water.
lmproper handling or storage can internally damage
the airbag and seat belt tensioner. making them inop-
erative.
lf you suspect the airbag and seat belt tensioner have
been damaged, install new units and refer to the
Deploymenvoisposal Procedures for disposing of the
damaoed units.
AIRBAG CONNECTORS
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Precautions/Procedures
SRS Unit Precautions
Take extra care when painting or doing body work in
the area below the dashboard. Avoid direct exposure
of the SRS unit or wiring to heat guns, welding, or
spraying equipment.
Disconnect the driver's/front passenger's airbag con-
nectors and seat belt tensioner connectors before
working below the dashboard near the SRS unit.
After any degree of frontal body damage, or after a
collision without airbag deployment, inspect the SRS
unit for physical damage. lf it is dented, cracked, or
detormed, reolace it,
Be sure the SRS unit is installed securelv.
Do not disassemble the SRS unit.
Store the SRS unit in a cool {less than about
104"F/40"C) and dry {less than 80o/o humidity. no
moisture) place. Do not spill water or oil on the SRS
unit, and keep it awav from dust.
During installation or replacement, be careful not to
bump (impact wrench, hammer, etc.) the area a[ound
the SRS unit, The airbags could accidentally deploy
and cause damage or injury.
24-20
,..4
Inspection After Deployment
After a collision in which the airbags were deployed.
replace the SRS unit, and inspect the following:
1. Inspect all the SRS wire harnesses. Replace, don't
repair, any damaged harnesses
2. Inspect the cable reel for heat damage, lf there is any
damage. replace the cable reel.
3. After the vehicle is completely repaired, turn the
ignition switch on. lf the SRS indicator light comes
on for about six seconds and then goes off, the SRS
system is OK. lf the indicator light does not function
properly, go to SRS Troubleshooting.
rD
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