Blower HONDA CR-V 1999 RD1-RD3 / 1.G User Guide

Troubleshooting
Blower Motor Speed
Recirculation indicator light indicates Diagnostic Trouble Code (DTC) 2: A problem in the blower motor circuit
The speed of the blower motor is controlled by signals sent from the heater control panel
POWER TRANSISTOR 3P CONNECTOR
1
2)3
f
BLK
Wire side of female terminals
JUMPERWIRE
HEATER CONIROL PANEL 2OP CONNECTORWire side oI fgmale t€rminals
12,/1,/68I10
't112131ia't51611181920
LI GRN/BLK
o
LT GBN/BLK
Blower motol only runs on highspood position; h does not run inany othe. speod positions.
Self-diagnosis circuit check indi-cates a problem in the blowermotor circuit,
Chack lor.n open in the wire:1. Disconnect the power transis-tor 3P connector.2. Check for continuity betweenthe No.3 terminal and bodygro(1nd.
Chock for.n op.n in thc wirobotween ihe powa. transistorrnd body ground, It tho wir. is
OK, check for poor ground atG,O1 .nd G4o2.
ls there continuity?
Chsck for an opon in the wire:'1. Connect the No. 1 and No. 3t€rminals of the power tran-sistor 3P connector with ajumper ware.2. Turn the ignition switch ON {ll).
Repair op6n in the wiro betwoontho Dower transi3tol and theblowor motor.
Check tor an open in tho wire:1. Turn the ignition switch OFF.2. Disconnect the iumper wire.3. Remove the heater controlpanel (see page 22-46).4. Check for continuity botweenthe No. 20 terminal of theheater control panel 20P con-nector and the No.2 terminalof the power transistor 3Pconnectof,
R€pair opon in tho wire betwoenth6 oowor ttan3i3tor and th6hoatar control oanel.
NOTE: lf the blower motor doesrun at all, refer to page 22-16.
10 page 22-15
22-14
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From page 22-14
Chock for a short in the wire:Check tor continuity between theNo. 20 terminal of the heater con'trol panel 20P connector and bodyground,
R.p.ir short in the wire betwoenth. herter control Denel snd theoowor tranSastor.
Check to. an open in the wire:1. Turn the ignition swilch ON (ll).
2. Measure the voltage betweenthe No. I terminal of theheater control panel 8P con-nector and body ground.
Repair opan in the wire betwaentho heatsr cont.ol o.nel and theblower motor.ls there battery voltage?
Chock th6 power iransistor:1. Turn the ignition switch OFF.2. Reconnect the heater controlpanel 8P and 20P connectors.3. Test the power transistor (seepage 22 44).
ls the power transistor OK?
Chec* for loo3e wires or Door oon-neclions at the heater controlpanel 8P and 20P connoctors andat lhe power tran3istor 3P connec-tor. lf lhe connectiorc are good,substituta , known-good hoatercontrcl pan6l, and r€check. ll thesymptom/indication goes away.replecg th6 original heater controloanel.
HEATER CONTROL PANEL 2OP CONNECTOR
2,/1,/l/68910
1112131a151617181920
LT GRN/BLK
o
Wire side of female terminals
HEATER CONTROL PANEL 8P CONNECTOR
BLU/8LK
Wire side of female terminals
1
4678
22-15
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Troubleshooting
Blower Motor
Recirculation indicator light indicates Diagnostic Trouble Code (DTC) 2: A problem in the blower motor circuit.
The speed of the blower motor is controlled by signals sent from the heater control panel,
BLOWER MOTOR 2P CONNECTOR
JUMPEFw|RE
Wire side of lemale terminals
Blower motor do.3 not run at all.
Selt-diagnosis circuit check indi-cates a problem in the blowermotor circuit,
check rhe No. 55 (40 A) {use inthe under-hood fuse/relay box,and the No. 17 (7.5 A) fuse in theunder-dash fuse/relay box.
Replace th6 fuse(s), and rechalck.
Check tho blowe. motor inputand output cilcuh:1. Connect the No. 2 terminal ofthe blower motor 2P connec-tor to body ground with ajumper wrre.2. Turn the ignition switch ON (ll).
Does the blower motor run?
Chock the blower moto.:1. Disconnect the jumper wireand the blower motor 2P con-nector.2. Measure the voltage betweenthe No. l terminal and bodygrou nd.
Check tho blower motor rolay:1. Turn the ignition switch OFF.2. Romove the blower motorrelay from the under-hoodfuse/relay box, and test it (seepage 22 45l'.
fo page 22-11
fo page 22-19
22-16
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From page 22-16
Check lhe blower motor hightelay:1. Turn the ignition switch OFF,and disconnect the ju mper
2. Remove the blower motorhigh relay, and test it {seepage 22-45).
Check for rn opon in the wire:l. Connect the No. 1 terminal ofthe blower motor high relay4P connector to body ground
with a iumper wire.2. Turn the ignition switch ON (ll).
R6pair opcn in the wire botwoenthe blower motor and the blowermotoi high relry.Does the blower motor run?
Check tor an opon in the wire:'1. Turn the ignition switch OFF,and disconnect the iumper
2. Turn the ignition switch ON {ll).3. Meas0re the voltage betweenthe No. 2 terminal of theblower motor high relay 4Pconnector and body ground.
Repair opon in the wiro betweonthe No. 17 fuse and tho blowelmotor high relay.ls there battery voltage?
Check tor an open in the wire:'1. Turn the ignition switch OFF.2. Check lor continuity betweenthe No. 3 terminal ot theblower motor high relay 4Pconnector and body ground.
Check for an open in the wirebetween the blowar motor highrel.y and body ground. lf the wiroi3 OK, check fo. poor ground atG{Ol .nd Gt|()2,
To page 22-18
BLOWER MOTOR HIGH BELAY itP CONNECTOR
BLU/BLK rF r.--1 1 2 )l|_#
.ruuee" I l31i
wrRE I
Wire side of female terminals
(cont'd)
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Troubleshooting
Blower Motor (cont'd)
BI-OWER MOTOR I{IGH RELAY 4P CONNECTORWire side of female terminals
HEATER CONTROL PANEL 8P CONNECTORWire side of female terminsls
I{EATER CONTROL PANEL 2OP CONNECTORWirc side ot female terminals
Ftom page 22-17
Check for an open in the wiro:1. Femove the heater controlpanel (see page 22-46).2. Check lor continuity betweenthe No. 8 terminal oI theheater control panel 8P con-nector and the No. 1 terminalof the blower motor highrelay 4P connector.
Ropair op6n in th€ wira betweentho heater control panol and thoblowgr motor high relay.
Check lor an op6n in the wire:Check lor continuity between theNo. 8 terminal oI the heater control panel 20P connector and theNo. 4 terminal of the blowermotor high relay 4P connector.
Repair open in the wire botweonthe heater control Danel and theblowel motor high r6lay.
ls there continuhy?
Check fo. looso wiles or ooolconnoctions at the haatea controlDanel 8P .nd 20P connectors andat the blower motor high relay4P connoctor. ll the conn€ctionsare good, substitutg a known-good h.at.r control panol, andr.check. lf the symptom/indice-tion goes away, replace thg origi-nal heater contrcl panel.
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Rcpbcc tho blower motor rolay.
Ch.ck th. under-hood tu.o/rolaybox:Measur6 the voltage between theNo. 3 terminal ofthe blower motorrelay 4P socket and body ground.
Chack tor an open in the wilo:1. Turn the ignition switch ON (ll).
2. Measure the voltage betweenthe No. 4 terminal of theblower motor relav ,[P socketand body ground.
Ropair opon in the wirs botwoonth. No. 17 fu3o and th. blow6rmotol lolay.ls thore battery voltage?
Chack tor an opon in tho wilo:1. Turn the ignition switch OFF.2. Check for continuity betweenthe No. 2 terminal ot theblower motor relay 4P socketand body ground.
Chock tor !n opan in the wilebstween tha blowar motor ralaY.nd body ground. It tho wilc isOK, chock fol poor ground atG/Ol and G402.
Ropair opon in th. BLU/WHTwira batwaan lho blowor motolrohy and tho blowe. motor.
Frcm page 22-16
BLOWER MOTOR RELAY 4P SOCKET
922-1
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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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Evaporator Temperature
SensorPower Transistor
Test
Dip the sensor in ice water, and measure the resistance
with a digital multimeter. Then pour hot water on the
sensor, and check lor change in resistance.
Compare the resistance reading between the No. | 8nd
No. 2 terminals of the evaporator temperature sensor
with the specifications shown in the following graph;
resistance should be within the specifications.
EVAPOBATOR TEMPERATURE SENSOB
Terminal side ol male terminals
4
RESISTANCEko
t0
50 68 86.F10 20 30'c
22-44
12V 1.2-3.1W
No. 2 ILT GRN/BLK)
No. I IBLU/BLK)
Test
1.Disconnect the 3P connector from the oower tran-
st$or.
Carefully release the lock tab on the No. 2 terminal in
the 3P connector, then remove the terminal and insu-
late it from body ground.
Connect a 1.2 - 3.4 W bulb between the No, 1 and
the No,2 cavity on the 3P connectol
Reconnect the 3P connector to the power transistor.
Turn the ignition switch ON (ll). and check that the
blower motor runs.
a lf the blower motor runs at half soeed the oower
transistor is OK, replace the heater control panel.
. lf ths blower motor does not run at half soeed,
reDlaca the Dower transistor.
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Relays
Test
There should be continuity between the No. 1 and No.3
terminals when power and ground are connected to the
No. 2 and No. 4 terminals, and there should be no conti-
nuity when power is disconnected.
3
o Blower motor relay
. Blower motor high relay
,I It)
In P
I)
There should be continuity between the No. 1 and No. 2
terminals when power and ground are connected to the
No. 3 and No. 4 terminals, and there should be no conti-
nuitv when oower is disconnected.
Rsdiator fan relay
Condenser fan relay
Compressor clutch relay
a
a
.I I
tr€
II
F)'"
,2-4.._.
22-45
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Heater Control PanelBlower Unit
Replacement
'1.Remove the center panel together with the heater
control panel and the audio unit (see section 20).
Remove the self-tapping screws and the heater con-
trol panel from the center panel.
3. lnstall in the reverse order of removal.
CENTER PANEL
22-46
1.
Replacement
Bemove the evaporator (see page 22-48),
Disconnect the connectors from the blower motor,
the blower motor high relay, the power transistor
and the recirculation control motor. Remove the
wire harness clio from the recirculation control
motor, and release the wire harness from the clamp
on the blower unit. Remove the mounting bolts, the
mounting nut and the blower unit.
6x1.0mm9.8 N.m (r,0 kgf.m, 7.2 lbl.ftl
9.E N.m 11.0 kgf.m,7.2lbtftl
lnstall in the reverse order of removal. Make sure
that there is no air leakage.
6x1.0mm
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