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

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
Mode Control Motor
NO
MODE CONTROL MOTOR 7P CONNECTOR
13I5
BLK/YEL
Wire side of female terminals
HEATER CONTROL PANEL 2OP CONNECTOR
BRN/WHT
Wire side of female terminals
Mode control motol does not run.or ono or more modes are inoD€aa-
Check the No. 17 {7.5 A) Iuse inthe under-dash fuse/relay box.
Replace the tus€, snd iecheck.
Chock tor an open in th€ wi.6:1. Disconnect the mode controlmotor 7P connector.2. Turn the ignition switch ON (ll).3. Measure the voltage betweenthe No. l terminal and bodyground.
Repair opon in the wire betwoontho No. 17 luse and tho modecontrol motor.
Check the mode control motor:1. Turn the ignition switch OFF.2. Test the mode control motorGee page 22 41') .
Chock th€ mode cont.ol link.geand doors:1. Remove the mode controlmotor (see page 22-41).2. Check the mode control linkageand doors for smooth move-ment,
ls lhe mode control motor OK?
Do the mode control linkageand doors move smoothly?
Replece the inod6 control motor.
Chock for s shon in the wir€s:1. Remove the heater controlpanel (see page 22'46).2. Check for continuity betweenthe No. 12, 13, 14, 15, 16 and 19terminals ol the heater controlpanel 20P connector and bodyground individuaily.
Repair any short in the wire(slbetween the mode control rnotoaand the h6ater control Danel.
ls there continuity?
2l,/1,/8I10
111213ta151617r81320
BLU
[E!r!
YEL/RED
Ii
To page 22-23
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Troubleshooting
Recirculation Gontrol Motor
YES
To page 22-25
REORCULATION CONTROL MOTOR,rP CONNESTOR
q?- T--- V-l
l1, lrl/l1lI BI.IUYEL(v)
+
Wire side of female terminals
Rocirculation control door do6snoi chango botw€en Fresh andReci.culate.
Check the No. 17 {7.5 A)tuse in theunder-dash f use/relay box.
Roplace the fu36, and rechock.
Check for .n open in the wire:1. Disconnect the recirculationcontrol motor 4P connector.2. Turn the ignition switch ON (ll).3. Measure the voltage betlveenthe No. l terminal and bodyground.
Repair op6n in the wire bdtweenthe No. 17 fuse and thc recircule-tion control motor.
Check the rocirculation controlmoior:1. Turn the ignition switch OFF.2. Test the recirculation controlmotor (see page 22-42).
Chock ths r.circulation controllinkag. end doori1. Remove the recirculation con-trol motor (see page 22,42).2. Check the recirculation controllinkage and door for smooth
Do the recirculation control linkage and door move smoothly?Boprir the recirculrtion controllinkag. or dooJ,
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Troubleshooting
Radiator Fan (cont'dl
From page 22-26
RADIATOR FAN RELAY 4P SOCKET
BLK/YEL
1
2
a
Chock for an open in the wire:'1. Disconnect the jurnper wire.2. Turn the ignition switch ON (ll).3. lleasure the voltage betweenthe No.4terrninal of the radia-tor fan relay 4P socket andbody ground.
R€pair open in th6 wire botwoonthe No. 17 fuso and the radiatolfan .elsy.
ls there battery voltage?
Rep.ir open in the GRN wirebotw€en lhe radiator tan relayand the PCM/ECM.
22-28
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Chock for an open in the wiro:1. Disconnect the iumper wire.2. Turn the ignition switch ON (ll).
3. Measure the voltage betweenthe No. 4 terminal oI the con-denser fan relay 4P socket andbody ground.
Repair opcn in tho wire betwoonthe No. 17 tuse and the con-densea fan relay,
Repair open in the GRN wirob6tw6en the cond.nser lan relayand rhe PcM/EcM,
Ftorn page 22-29
CONDENSER FAN RELAY 4P SOCKET
22-31
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Radiator Fan Switch
RADIATOB FAN SWITCH 2P CONNECTOR
1
'.r
GRN
Wire side of female terminals
Both tans (radiator and condenser)do not run fo. engine cooling, butthey both run with the A/C on.
Check lor rn open in the wire:1. Disconnect the radiator fanswitch 2P connector.2. Turn the ignition switch ON lll).3, Measure the voltage betlveenthe No.2 terminal and bodygrou nd.
Repair open in the wire betweenthe radiator tan relay, the con-densei lan .elay and the radiaiortan swhch.
ls there battery voltage?
Chock for an open in the wire:1. Turn the ignition switch OFF.2. Check for continuity betweenthe No. 1 terminal of the radi-ator fan switch 2P connectorand body ground.
Check for an open in the wirebetween the .adialor fan switchand body glound. I ths wire is OF;choc* tor poor g.ound at G'101.
ls there continuity?
ls the cooling system OK?
Replsce the radialor fan switch.
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Both Fans
RADIATOR FAN RELAY 'P SOCKET
BLK/YEL
PCM CONNECTOR A I32PI
'9? model:
PCM/ECM CONNECTOR A (32PI
'98 - 0O mod6ls:
Wire side of female terminals
* How to use the Backprobe SetsConnect the backprobe adapters to the stacking patch cords, and connect the cords to a multimeter. Using the wire insulation as a guide for the contoured tip of the backprobe adapter,gently slide the tip into the connector from the wire side until it comes in contact with the terminal end ofthe ware {see section l1).
Check the No. 17 (7.5 A) tuse inthe under-dash fuse/relay box.
Reolace the tuse. and recheck.
Check for an op€n in the wire:1. Remove the radiator fan relay.2. TLrrn the ignition switch ON (ll).
3. Measure the voltage betweenthe No.4 terminalofthe radiator fan relay 4P socket andbody ground.
Repair open in the wire betweenlhe No. 17 luse and the radiatortan relay.
Check for an open in the wire:1. Make sure the A/C switch isOFF.2. Using a *Backprobe Set {T/N07SAZ - 001000A), measurethe voltage between the No. 27I20l terminal ol the PCM/ECMconnector A (32P) and bodyground with the PCM/ECM con-nectors connected.[ ]: '98 - 00 models
Repair open in the wire b€tweenthe.adiator fan ralav, the con-denser tan rolay and the PCM/ECM.
Check tor loose wires or poor con-nodions at the PCM/ECM connoc-tor A (32P1. lf the connections arcgood, substitute a known-goodPCM/ECM, and recheck. It thesymptom/indicalion goes away,r.plrce the original PCM/ECM.
1
2
1
12461011
12t5t61718r9222321
GRN
Wire side oI female terminals
22-33
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