1998 HONDA INTEGRA heater

Heater Door Positions
II Horfr coor
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t
IHEAT/VENTI
(cont'd)
VENT DOOR
21-3

Heater Door Positions
(cont'd)
fr seel
21-4

SYMPTOMREMEDY
Hot air tlow is low.Blower motor runs, but one or more
speeds are inoperative.
Follow the flowchart (see page 21-9).
Blower runs propetly.Check for the following:. Clogged heater duct
. Clogged heater outlet
. Incorrect door Position
No hot air tlowBlower motor does not run at all.Follow the flowchart {see page 21-11}
Blower motor runs.Check for the following:
. clogged heater duct
. Clogged blower outlet. Clogged heatet valve
. Faultv air mix door
. Heater valve cable adjustment lsee page 21-27].
. Air mix control cable adiustment {see page 21-27)
. Faulty thermostat (see section 10)
. Clogged evsporator (with air conditioning)
. Frozen evaDorator (with air conditioning)
Mode control motor does not run, or one or more mooes are
inoDeratave.
Follow the flowchart (see page 21-14).
Recirculation control door does not change between FRESH
and RECIRCULATE.
Follow the flowchart {see page 21-17).
Troubleshooting
Symptom Chart
NOTE: Check the engin€ coolant level and allow the engine to warm up before troubleshooting'
21-8
v

qrt
View from wire side
BLU/BLKBLU/WHT
1
To page 21- 1O
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BLU/YEL
l'r
Elowor motor runs, but one ormole speeds sr€ inoperative,
Turn the ignition switch ON lll),and the heater fan switch OFF.
Does the blower motor run?
Turn the ignition switch OFF.
Measure the resistance betweenthe No. 2 and No. 4 terminals ofthe blower resistor.
ls there approx. 2-3 ohms?
Remove the heater control panel(see page 21-25).
Turn the ignition switch ON (ll).
At the heater fan switch 6P con-nector, ground each of thesewires individually in the followingorder:. BLU wire. BLUMHT wire. BLU/YEL wire. BLU/BLK wire
To page 21 10
(cont'd)
21-9

Troubleshooting
Blower Motor Speed (cont'dl
From page 21-9
Does the blower motor run atprogressively higher speeds?Reolace the heat€r tan switch.
Repair open or cause of excessiveresistance in the approprialewi.e{s) betweon the heater fanswitch and the blower resistor.View from wire side
From page 21-9
View trom wire side
BLU
ilif
fril t
)ltBLU/WHT
ls there continuity?
BLU/BLK
BLU
' lz-
Turn the ignition switch OFF.
Remove the heater conlrol panel(see page 21 25).
Check each wire for continuity be-tween the heater fan switch 6Pconnector and body ground.. ELIJ wire. BLU/WHT wire. BLU/YEL wire. BLU/BLK wire
Replace the heat6r fan switch.
Bepair short in the wire(sl be-tween the heater fan switch andthe blow€r resistor.
If
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BLU/BLK
21-10

Troubleshooting
Blower Motor (cont'd)
From page 21-11\View from wire side
8LU/BLK( + I
Turn the ignition switch OFF.
Remove the heater control panel(see page 21-25).
Turn the ignition switch ON lll).
Measure the voltage between theBLU/BLK wire terminal {+) andbody ground (- ).
Repair open in the BLU/Bl-K wir6between the blowea motor andthe hoster lsn switch.ls there battery voltage?
Turn the ignition swirch OFF.
Check for continuity in the BLKwire between the heater fanswitch and body ground.
Check fo. an oDen in th6 8LK wirebotwo€n th€ haat€r tan switchand body ground. ll th6 whe isOK. check tor poor ground atG201 and 401.
Rsplac€ the heat€r fan switch.
ls there continuity?

II
JFrom page 21- 14
ls the mode control motor OK?
YES
NO
To page 21-16
View from wire side
BLU/WHT
GRNTYEL
(cont'dl
Check for continuily in the BLKwire between the mode controlmolor and body ground.
Check tor an oDen in the BLK wireb€twe€n the mode control motorand body ground. lf the wiro isOK, check for poor ground atG201 and G401.
Test the mode conlrol motor (seepage 21-281.
Remove the mode control motor(see page 21-28).
Remove the heater control panel
lsee page 21-25).Check the mode control linkageand doors for smooth movement,
Disconnect the heater controlpanel 14P connector.Ropair the modo contrcllinkag€ or doors.Do the mode control linkageand doors move smoothly?
Check each wire for continuity be-tween the mode control motorand body ground.. YEL/BLU wire. YEL wire. BLU/WHT wire. GRN/YEL wire' YEL/RED wire
ReDlace the mode conlrol molor.
Ropaii any short in the wiiolslbe-tw6€n the mod€ control motorand th€ heater control oan6l,
Check the same wires for voltaoe,
Ropair sho.t to power in theBLK/YEL wir€ betweon the mod€controlmotor and the hottor con-trol panel. (This damagos thgheater control oanel.)
ls there any voltage?
,.i:...
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21-15

Troubleshooting
Mode Control Motor (cont'd)
From page 21-15
View lrom wire side
No. 2 YEL
No. 1 BLU,4 THTNo. 3 YEL/BLU
No. 7
No. I GRN/YEL
Check each wire for continuity be-tween the mode control motorand the hoater control panel.. YEL/BLU wire. YEL wire. BLUMHT wire. GRN/YEL wire. YEL/RED wire
R6pair any open in th€ wirels) be-tween the modo control motoiand the heater control oan€|.
Replace the hsatar control panol.
View from wire side yEL
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21-16