1999 HONDA CIVIC ect

Troubleshooting -'99 - 00 Models
Recirculation Control Motor (cont'd)
Frcm page 21-27
HEATER CONTROL PANEL 8P CONNECTOR
Check for a short to power in the
1. Turn the ignition switch ON {ll).2. Disconnect the heater controlpanel 8P connector.3. Check for voltage between theNo.2 and No. 3 terminals oftheheater control panel 8P con,nector and body ground individually.
Repair 3hort to powe. in thewire{a) b.tween tho haetor con-trol panel and the recirculationGontrol moto.. This short alsodamagos the heate. controlpanel. Repair the short to powerb€tore .eplecing the h€ater con-trol panel.
ls there any voltage?
Check to. a short to ground:1. Turn the ignition switch OFF.2- Check the same terminals forcontinuity to ground.
Roprir lhon in tho wir.{s) b€tweothe horter control panel and theracircr alion conhol motoa.
Check for an open in the wires:1. Disconnect the recirculationcontrol motor 4P connector.2. Check for continuity betweenthe following terminals of therecirculation control motor 4Pconnector and the heater con,trol panel 8P connector.8P: 4PiNo.2 - No.2No.3 - No.4
Repair open in ths wirolsl betw€€nthe heate. co.rkol panol and therecirculation control motor .
Check lor loo3a wires or pootconn€ctions at the hoater controlpanel 8P connector and at theaecirculation control motor ilPconnector, It tho connections aregood. substitut€ e known-goodheatei control panel, and aecheck.lf th€ symptom/indication goesaway, replace the original hedtercontrcl Danel.
GRN/WHT
I1
GRN/RED
RECIRCULATION CONTROL MOTOR4P CONNECTORWire side of female terminals
21-28

BIower Motor Speed
To page 21 30
NOTE: lf the blower motor does not
run at all, refer to page 21-31.
POWEB TRANSISTOR 3P CONNECTOR
BLK
Wire side ol female terminals
JUMPERWIRE
HEATER CONTROL PANEL 2OP CONNECTOR
Wire side of female terminals
LT GRN/8LK
(cont'd)
21-29
Blower motor only runs on high
speed position; it does not run in
any other speed Positions
Check for an open in lhe wire:
1. Disconnect the power transis
tor 3P connector,2. Check for continuity between
the No. 3 terminal of thepower transistor 3P connector
and body ground.
Check tor an open in the wire
between the Power ttansistor
and body gtound. lf the wire is
OK, check for poor ground at
G401 and G402.
ls there continuity?
Check tor an open in the wire:
1. Connect the No. 1 and No 3
terminals of the Power tran_
sistor 3P connector wlth ajumper wire.2. Turn the ignition switch ON {ll)
Repair open in the wire belweenthe blower motor and the Powettranststor.
Check tor an open in the wire:
1. Turn the ignition switch OFF
2. Disconnect the iumPer wire.
3. Disconnect the heater controlpanel 20P connector.4. Check for continuity between
the No. 1 terminal of the
heater control panel 20P con-
nector and the No. 2 terminal
of the Power transistor 3P
Repair open in the wire between
the heater control Panel and tho
oower transistor,ls there continurty)
3
o

Troubleshooting -'99 - 00 Models
Blower Motor Speed (cont'dl
HEATER CONTROL PANEL 2OP CONNECTOR
Wire side oJ female terminals
Wire side ot female terminals
Frcm page 21.29
LT GRN/BLK
Check tor a short in the wi.a:Check for continuity between theNo. 1 terminal of the heater control panel 20P connector and bodyground.
Repair short in ths wire betwsenthe hoater control panel and theoower transastoa.
Check for an open in the wire:1. Disconnect the heater controlpanel 8P connector,2. Turn the ignjtion switch ON 1ll).3. Measure the voltage betweenthe No. 'l terminal of theheater control panel 8P connector and body ground.
Repeir open in the wiio betweenthe heater control panel and theblower motoa.
Check the power transistor:1. Turn the ignition switch OFF.2. Reconnect the heater controlpanel 8P and 20P connectors.3. Test the power transistor {seepage 21 50).
ls the power transistor OK?
Check for loos€ wiras or poor con-nections at the h€at€r controlpanel 8P and 20P connectols andat th6 power transistor 3P conn€c-tor. lf the connections are good,substituto a known-good hoatercontrol panel, and recheck. It thesymptom/indication goes away,replace the original heater controloanel,
HEATER CONTNOL PANEL 8P CONNECTOR
21-30

Blower Motor
BLOWER MOTOR 2P CONNECTOR
Wire side of lemale terminals
JUMPERWIRE
(cont'd)
21-31
Blower motor does not run at all.
Check the No. 55 (40 A) Iuse in
the under-hood fuse/relay box,
and the No. 17 (7.5 A){use in the
undeFdash fuse/relay box.
Boplace th€ fuse(3), and rechock.
Check th€ blow€r motor Powelsupply circuit:1. Disconnect the blower motor
2P connector.2. Turn the ignition switch ON {ll).
3, Measure the voltage between
the No. 1 terminal oI the blow
er motor 2P connector and
body ground.
ls there battery voltage?
Check tha blower motor:
1. Turn the ignition switch OFF
2. Reconnect the blower motor
2P connector.3. Connect the No.2 terminal o{
the blower motor 2P connector to bodv ground with a
tumper wire.4. Turn the ignition switch ON {ll}
Does the blower motor run?
fo page 21-32
To page 21-33

From page 21 31
ls there continuity?
YES
Check the blower motor highrelay:1. Turn the ignition switch OFF,and disconnect the iumPer
2. Remove the blower motor
high relay, and test it. {seepage 21 49).
Check lor an open in the wire:1. Connect the No. 1 terminal ofthe blower motor high relay4P connector to body ground
with a jumPer wire.2. Turn the ignition switch ON (ll).
Repair open in the wire belweenthe blower motor and the blowermotor high rolay.Does the blower motor run?
Check for an op6n in the wir6:1. Turn the ignition switch OFF,and disconnect the iumPer
2. Turn the ignition switch ON (ll).
3, Measure the voltage betweenthe No. 2 terminal of theblower motor high relay 4Pconnector and body ground.
Repair open in the wire betweenthe No. 17 fuse and the blowor
motor high relay.ls there battery voltage?
Check for an open in the wire:1. Turn the ignitaon switch OFF.2. Check for continuity betweenthe No.3 terminal of theblower motor high relay 4P
connector and body ground.
Ch6ck lor an op.n in the wirebotween the blower motor highrelay and body ground. ll the wireis OK, ch6ck for poot ground atG401 end G402.
To page 21 34
BLOWER MOTOR HIGH RELAY 4P CONNECTOR
JUMPERWIRE
Wire side of female terminals
(cont'd)
21-33

Troubleshooting -'99 - 00 Models
Blower Motor {cont'dl
BLOWER MOTOR HIGH RELAY 4P CONNECTORWire side of female terminals
BLU/BLK
BLU/ALK
HEATER OONTROL PANEL 8P CONNECTORwir€ sido ot f€male torminals
HEATER CONTROL PANCL 2OP CONNECTORWire side of female terminals
From page 21-33
Check tor an opgn in the wiro:1. Disconnect the heater controlpanel 8P connector.2. Check lor continuity betweenthe No. 1 terminal of theheater control panel 8P con-nector and the No. 1 terminalot the blower motor highrelay 4P connector.
Repsi. op€n in the wir. betw.enthe h..t.r contrcl p.ncl .nd thoblowar motor high rahy.
Ch€ck for an opon in the wir6:1. Disconnect the heater controlpanel 20P connector.2. Check for continuity betweenthe No. 13 terminal of theheater control panel 20P con-nector and the No. 4 terminalof the blower motor highrelay 4P connector.
Ropair opon in tho wiro botwoontha hartor cor rol pangl rnd thablower motor high .elay.
Ch.ck for looso wiros or poor
conn€dions at th6 heato. controlpanel 8P and 20P connectoB andat the blowol motor high relty4P connoctor. It tho connoctionsare good, substitute a known-good heatcr control panel, andrecheck. It the symptom/indica-tion goos away, rgplaco the oiigi-nal heater control oanol.
2
34
o
t2
a568
I23a5078I10
11121315,/1,/1,/m
ORN/WHT
o
12
34
OBN/WHT
21-34

Both heater and A/C do nol work.
checkthe No.47 (7.5 A)fuse in the
under-hood fuse/relay box, and theNo. 17 {7.5 A) fuse in the under-
dash fuse/relay box.
ReDlace the tuse{s), and recheck.
Check lor an open in the wire:
1. Disconnect the heater controlpanel 8P connector,2. Turn the ignition switch ON (ll).
3. Measure the voltage between
the No. I terminal of the
heater control panel 8P con-
nector and body ground.
Repair open in the wire betweenthe No. '17 luse and th6 heatercontrol oanel,ls there battery voltage?
Check for an open in the wire:
1. Turn the ignition switch OFF.
2. Disconnect the heater controlpanel20P connector.3. Measure the voltage lletweenthe No. 10 terminal of theheater control Panel 20P con-nector and body ground.
Repair op6n in the wir€ between
the No. il7 tuse and the heater
controloanel,ls there battery voltage?
Check for an open in the wite:Check for continuity between theNo. 6 terminal of the heater con
trol panel 8P connector and bodyground.
Ch6ck tor an open in lhe wire
betwoen the heator control Paneland bodv ground. lf the wire isOK, check for poor ground atG401 and G402.
ls there continuity?
Check for looso wires or Poolconneciions at the heater controloanel 8P and 20P connectors. lf
the connections are good, substi'
tute a known-good heat€r con-trol Danel, and recheck. lI thesymptom/indication goes awaY,r6place the original h€ater con-troloanel.
HEATER CONTROL PANEL 8P CONNECTOR
BLK/YEL
Wire side of female terminals
HEATER CONTROL PANEL 2OP CONNECTOR
Wire side of temale terminals
I2
1578
BLK
o
1
4I
v

Troubleshooting -'99 - 00 Models
Heater Control Panel Input/Output Signals
HEATER CONTROL PANEL CONNECTORS
8P CONNECTOR2OP CONNECTOR12P CONNECTOR
Wire side of female terminals
8P CONNECTOR (O qn Circuit Diagram)
20P CONNECTOR {D on circuit Diagram}
*: with Ay'c
12P CONNECTOR (tr on Circuit Diagraml
CavityWire colorSignalCavilyWhe colorSignal
BLU/8LKBLOWER FEEDBACKINPUT5REDDASH LIGHTS BRIGHTNESSCONTROLLEROUTPUT
2GRN/lVHTFRESHINPUT6BLKGBOU N DOUTPUT
3GRN/REDRECIRCULATEINPUT7BLU/YELREAR WINDOW DEFOGGERRELAYOUTPUT
4RED/BLKCOMBINATION LIGHT SWITCH(Via No. 30 (7.5 A) fuse)INPUT88LfiELlG2 {Power)INPUT
CavityWire colorSignalCavityWire colorSignal
LTGRN/BLKPOWER TRANSISTOR EASEOUTPUT't1BLU/REDAy'C THERMOSTATINPUT
2BRNMHTMODE CONTROL MOTORGROUNDINPUT12BRNAIR MIX CONTROL MOTORGROU NDINPUT
3RE D/YELAIR MIX HOTOUTPUT13ORNAA/HTBLOWER MOTOR HIGHRELAYINPUT
RED,ryvHIAIR MIX COOLOUTPUT14
5YEUBLUMODE DEFINPUTPN K,/BLKAIR MIX POTENTIALOUTPUT
6YEUREDMODE VENTINPUT16
7GRNI/ELMODE HEAT/r'ENTINPUT11
IBLUAVHTMODE HEATINPUT18
9YELMODE HEAT/DEFINPUT19
10WHT/BLU+B (Power)INPUT20GRYAIR MIX POTENTIAL +5 VOUTPUT
CavityWilecolorSignalCavityWi.e cololSignal
lSWITCH LED COMMONOUTPUT1SWITCH LIGHTS +OUTPUT
2ISWITCH LIGHTS -INPUT
39SWITCH COMMONINPUT
4RECIRCULATION CONTROLSWITCH LEDINPUT10A,/C SWITCHOUTPUT
5A./C SWITCH LEDINPUT11RECIRCULATION CONTROLSWITCHOUTPUT
6REAR WINDOW DEFOGGERSWITCH LEDINPUT12REAR WINDOW DEFOGGEBSWITCHOUTPUT
21-36