ECU HONDA CR-V 1998 RD1-RD3 / 1.G Workshop Manual

Troubleshooting
Heater Control Panel Input/Output Signals
HEATER CONTROL PANEL CONNECTORS
8P CONNECTOR
Wire side of female terminals
2OP CONNECTOR
8P CONNECTOR
Cavitylrvire cololSignalCavityWire cololSignal
'lBLK/TE LIG2 (POWER)INPUTREDDASH LIGHTS ERIGHT-
NESS CONTROLLERCUTPUT
2GRN/REDRECIRCULATEINPUTRE D/BLK
COMBINATION LIGHT
SWITCH (Via No. 30 (7.5 A)
fuse)
INPUT
GRN/VVHTFRESHINPUT1BLKGROUNDOUTPUT
BLUI/ELREAR WINDOW
DEFOGGER RELAYCUTPUT8BLU/BLKBLOWER FEEDBACKINPUT
20P CONNECTOR
CavityWire colorSignalCavityWire colorSignal
1GRYAIR MIX POTENTIAL +5VOUTPUT'llWHT/BLUBACK PU (POWER)INPUT
2GRNEVAPORATOR TEMPERA.
TURE SENSOROUTPUT12YELMODE HEAT/DEFINPUT
13BLU/BLKMODE HEATINPUT
14GRN/YELMODE HEAT/VENTINPUT
ICYEUREDMODE VENTINPUT
6PNI(BLKAIR MIX POTENTIALINPUTtoYEUBLUMODE DEFINPUT
717RED/BLUAIR MIX COOLOUTPUI
8ORNrur'HTBLOWER MOTOR HIGH
RELAYINPUT18RE D/VE LAIR MIX HOTOUTPUI
BRNSENSOR GROUNDINPUT'19BRNA/VHTIVIODE MOTOR GROUNDINPUT
10BLU,ryVHTA"/C PRESSURE SWITCHINPUT20T GRN/BLKPOWER TRANSISTOR BASECUTPUT
22-40
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4. Disconnect the heater hoses from the heater unit.
Engine coolant will run out when the hoses are dis-
connected; drain in into a clean drip pan.
CAUTION: Engino coolant will damage p8int. Ouickly
rinse any spill€d engine coolant Itom painted sur-
faces.
HEATER HOSEIOUTLET SIDE)
Remove the mounting nut from the heater unit.
Take care not to damage or bend the fuel lines, the
brake lines. etc.
CLAMPS
13 N.m 11.3 kg{.m,9.4 lbtftl
22-51
7.
ll.
Remove the dashboard (see section 20).
Remove the evaporator (see page 22-48).
Disconnect the connectors from the mode control
motor and the air mix control motor, and remove the
wire harness clips and wire harness from the heater
unit. Remove the clip from the heater duct, then
remove the mounting nuts and the heater unit
6x1.0mm9,8 N.m (1.0 kgt m,7.2lblft)
qInstall in the reverse order of removal. Make note of
the following items.
a
a
a
a
Apply sealant to the grommets.
Do not interchange the inlet and outlet heater
hoses. Make sure that the clamps are secure.
Refill the cooling system with engine coolant
{see section 10).
Adiust the heater valve cable (see page 22-53).
Make sure that there is no air leakage.
HEATER UNIT
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Gondenser
't.
Replacement
Recover the refrigerant with a recovery/recycling/
charging ststion (see page 22-59)
Remove the front grille (see section 20).
Remove the coolant reservoii, but do not discon-
nect the reservoir hose Jrom the coolant reservoir
and the radiator.
Remove the bolts and the suction line bracket as
shown. Remove the bolts and the upper mount
brsckets from the radiator.
UPPER MOUNTBRACKETS
Remove each bolt, then disconnect the discharge
and condenser lines from the condenser, Plug or
cap the lines immediately after disconnecting them
to avoid moisture and dust contamination.
6x1.0mm9.8 N.m 11,0 kgf.m, 7.2 lbfttl
t\,l/
ait- -:
i..
6x1.0mm
6xl.0mm9,8 N.m 11.0 kgf'm' 7.2lbf'ft)
22-70
DISCHARGE LINE
CONDENS€R LINE
6. Remove the mounting bolts, then remove the con-
denser by lifting it up as shown. Be careful not to
damage the radiator and condenser fins when
removing the condenser.
Install in the reverse order of removal. Make note of
the following items.
. lf you're installing a new condenser, add refriger-
ant oil (sP-10) (see page 22-54]..
o Replace the O-rings with new ones at each fit-
ting, and apply a thin coat of refrigerant oil
before installing them. Be sure to use the right
O-rings for HFC-134a (R-134a) to avoid leakage.
. Be careful not to damage the radiator and con-
denser fins when installing the condenser.
. Be sure to install the lower mount cushions of
condenser securely into the holes,
. Charge the system (see page 22-61), and test its
performance (see page 22-56).
7.
1,0 mm
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Troubleshooting
Tips and Precautions (cont'dl
Insen the connector all the way and make sure it is
securely Iocked.
Position wires so that the open end of the cover faces
down.
V
Faceopen end
Handling Wires and Harnesges
. Secure wires and wire harnesses to the frame with
their respective wire ties at the designated locations.
. Remove clips carefully; don't damage their locks.
Slip pliers under the clip base and through the hole at
an angle, then squeeze the expansion tabs to release the
clrD.
After installing harness clips, make sure the harness
doesn't interfere with any moving pans.
Keep wire harnesses away from exhaust pipes and
other hot parts, trom sharp edges of brackets and
holes. and from exoos€d screws and bolts.
NOT GOOD
A -M/
lr lr*
T€sting and Repairs
. Do not use wires or harnesses with broken insulation.
Replace them or repair them by wrapping the break
with electricaltape.
. After installing parts, make sure that no wires are
pinched under them.
. When using electrical test equipment, follow the
manufacturer's instructions and those described in
this manual.
. lf possible, insert the probe of the tester from the
wire side (except waterproof connector).
. Seat grommets in their grooves properly.
. Use a probe with a tapered tip.
Refer to the instructions in the Honda Terminal Kit for
identification and replacement of connector termi-
nals.
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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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