1999 HONDA CIVIC heater connections

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

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

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

Ftom page 22 18
Check tor an open in the wire:1. Turn the ignition switch OFF,then disconnect the iu mper
2. Remove the center dashboardlower cover lsee section 20),
and disconnect the heater con'
trol panel 14P connector.
3. Turn the ignition switch ON (ll).
4. Measure the voltage betweenthe No. 11 terminal and bodyground.
Repair op6n in the wire bstween
the A/C th€rmostat and th6 hoater
control panel.
Check lor an open in the wire:
1. Turn the ignition switch OFF.2. Disconnect the heater Ian
switch 6P connector,3. Check for continuity between
the No. 14 terminal of theheater control panel 14P con_nector and the No.6 terminalof the heater fan switch 6P con-nector.
Repair open in the wiro betweGnthe heal.r control Panel and theheater fan switch.
Check for an open in thG wire:Check for continuity between theNo. 1 terminal of the heater lanswatch 6P connector and bodYground.
Chock tor an open in tho wir€
between the heater lan switch
and body ground. lf the wire is OK,check for poor ground at G401 sndG402.
ls there continu;ty?
ReDlace the heater tan switch.ls the heater fan switch OK?
Check for loose wiaes or poor
connections at the heater controloanel 14P connoctor and hoetertan 3witch 5P conn€clor and atthe A/C thermostet 3P connec-tor. ll the connections are good,
raplace the heator control Panel.
r'oA - qe m^.lalal
HEATER CONTROL PANEL lilP CONNECTOR
tra6
7II'o lx't1121314
BLU/RED
Wire side of female terminals
HEATER CONTROL PANEL 1'P CONNECTOR
Wire side of female terrninals
HEATER FAN SW]TCH 6P CONNECTOR
Wire side of female terminals
(cont'd)
12;--?45
7I10X'll121314
GRN
123
a56GRN
22-19

Troubleshooting
('99 00 models)
From page 22 18
Check lor an open in the wire:1. Turn the ignition switch OFF,then disconnect the ju mper
2. Disconnect the heater controlpanel 20P connector.3. Turn the ;gnition switch ON{

i.4. Measure the voltage betweenthe No. 11 terminal of theheater control panel 20P con-nector and body ground.
Ropai. opan in tho wira batwaonthe A/C thermostat and thehoater control oanol.ls there battery voltage?
Check the push switch:1. Turn the ignition switch OFF.2. Disconnect the push switch12P connector.3. Check for continuity betweenthe No. I and No. 10 terminalsof the push switch 12P con-nector with the A/C switch ON.
Check for loose wi.es or poor
connections el the hgater controlpanel 20P connector and pushswitch 12P connector and at theA/C thermostat 3P connector. Ittha connections are good, substi-tute a known-good heatea con-trol pan€|, and recheck. lf thesymptom/indication goe3 away,replace lhe original healer con-trol oan€|,
HEATER CONTROL PANEL anP CONNECTOR
Wire side of temale terminals
PUSH SW]TCH 12P CONNECTOR
Wire side of female terminals
,/1,/156
7819t01112
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