ac circuit HONDA INTEGRA 1994 4.G Service Manual

Dashboard
Replacement Precautions
SRS wife harnesses are routed near the dashboard and
steering column.
CAUTION:
a Alt SRS olectrical wiling harness€s ale covorad
with Yollow insulation.
a Botore disconnecting any part ot the SRS wiro
harness, connect ths short connscto6 (see page
23-2721.
a Roplac6 ih€ entiro aflectod SRS halnoss assem-
bly il it has an opon cilcuit or damagod wiling'
LEFT DASHSENSOR
Bstora lomoving the dashboaid:
!@@ To avord accioenlal dsployment and
""iUU inir.v, always install the plotoctive short
;onnectors on the driver's and tlont pass€ngel's air-
bag connectors bolors working near any SRS wiring'
1. Disconnect the battery negative cable, then discon-
necl the positive cable.
NOTE: The original radio has a coded theft protec
tion circuit. Be sure to get the customer's code num-
ber before- disconnecting the battery.
- removing the No 32 (7.5A) Iuse from the under-
hood fuse/relaY box'- removing the radio.
After service, reconnect power to the radio and turn
it on. When the word "CODE" is displayed, enter
the customer's 5 digit code to restore radlo
ooeration.
DRIVER'S AIREAG
SRS UNIT
20-136
DRIVER'S AIRBAG
2.lnstall the short connectors (RED)
Ddvar's:
Remove the access panel, then disconnect the con-
nector between the cable reel and driver's airbag'
Connect the short connector (RED) to the driver's
airbag connector lsee page 23-27 2l'
DRIVER'SAIRBAG CONNECTOB
CABLE REELCONNECTOR
SHORTCONNECTOR(RED)
Front passongor's:
Remove the glove box {see page 20-135}, then dis-
connect the connector between the tront pas'
senger's airbag and SRS main harness Connect the
short connector (RED) to the front passenger's air-
bag connector (see Page 23-273).
FROf{T PASSENGER'SAIRBAG
ACCESS PAI{EL
FRONT PASSET{GER'SAIRBAG CONNECTON
SHORTCONNECTOR(REDI
SBS MAIN HARNESS
CONNECTOR

Heater and Air Conditioning
Heater ........ 21-1
Air Conditioning .......... ..22-1
SUPPLEMENTAL RESTRAINT SYSTEM {SRS}
The Integra SRS includes a driver's airbag, located in the steering wheel hub. In addition. all models except the
RS model for Canada have a front passenge.'s airbag located in the dashboard above the glovs box. Information
necessary to safely service the SRS is included in this Service Manual. ltems msrk€d with an asterisk (') on the
conlents page include, or are located near, SRS components. Servicing, disassembling or,eplacing thes€ items
will require special precautions and tools, and should therefore be done by an authorized Acura dealer.
a To avoid r6nd6dng tho SRS inoporativo. which could lead to personal injury or dealh in tho svont ot a sevele
frontal collision, all SRS servica work musl b€ portormed by an authorized Acura dealer.
a lmpropor sorvico procaduro3, including incorrect romoval and installatlon of tho SRS, could load to porsonal iniu-
ry causod by uninlonlional activation of tho ailbag8.
a All SRS eloctdcal widng harnossos are covored with yollow in3ulation. Relatsd compononts a.o locatod in tha
stsering column, flont console, daehboard, and dashboafd low6r pan6l, and in lhe dsshboa.d above lh€ glove
box. Do not uao electdcal tost equipmont on theae circuhs.
NOTE: The original radio has a coded theft protection circuit. Be sure to get the customer's code number beto.e
- disconnecting the battery.- removing the No. 32 (7.5 A) luse from the under-hood fuse/relay box.- removing the radio.
After service, reconnect power to the radio and turn it on. When the word "CODE" is displayed, enter the cus-
tomer's 5-digit code to restore radio operation.

Heater
lflustrated Index ............. .........21-2
Heater Door Positions .........,..,. 21-3
Circuit Diagram ....................... 21-6
Troubleshooting
Symptom Chart ............. ......21-8
Flowcharts
Blower Motor Speed ............................... 21 -9
Bfower Motor .........,..,,,,,.. 21-11
Mode Control Moto. ............ ................... 21 -14
Recircufation Control Motor ......,...,.,,,.,.... 21 -17
Heater Control Panel Input/
Output Signals ..............21-19
Blower Unit
Repfacoment ....................... 21-20
Overhaul .......21-21
+Heater Unit
Repfacement ....................... 21-22
Overhaul .......21-24
Def roster Door Adjustment ...,............. ......,, 21 -25
Heatel Control Panel
Repfacoment ....................... 21-25
Overhaul .......21-26
Heater Valve Cable
Adjustment ...21-27
Air Mix Control Cable
Adjustment ... 21-27
Mode Control Motol
Test .............. ..................... 21-2e
Repfacement ..,..............,,,,.. 21-28
Recirculation Control Motor
Test .............. ..................... 21-29
Repfacement ....................... 21-29
Relay
Test .............. ..................... 21-30
Heater Fan Switch
Test .............. ..................... 21-30
Mode Control Switch
Test .............. ..................... 21-31
Recilculation Control Switch
Test .............. ..................... 21 -31
*: Read SRS precautions before working in this area.

lllustrated Index
CAUTION:
a All SRS electrical wiling harnesses are covered with
y€llow insulation.
a Bafore disconnecting any pan of the SRS wile har-
ness. connect the sholt connectorlsl.
a Replace the sntire aflected SRS halness assembly if
it has an open circuit or damaged wiring.
NOTE: The original radio has a coded thelt protection
circuit. Be sure to get the customer's code number before- disconnecting the battery.- removing the No. 32 (7.5 Al fuse lrom the under-
hood fuse/relav box.- removing the radio.
After service, reconnect power to the radio and turn it
on. when the word "CODE" is displayed, enter the cus-
tomer's 5-digit code to restore radio operation.
BLOWER UNITReplacement, page 21-2OOverhaul, page 21-21HEATER UNITRepfacement, page 2l 22Overhaul, page 21-24
RECIRCULATION CONTROL MOTORTest, page 21-29Replacement, page 21 29I{EATER VAIVE CABLEAdjustment, page 21-27
BLOWEN RESISTORTest, page 21-9
AIR MIX CONTROLCABLEAd,ustment, page 21-27Replacement. page 21-26
a/c swrTcH(wirh A/clTest, page 22-20
RECIRCULATIONCONTROL SWITCHTest, page 21-31
HEATER FANswtTcHTest, page 2'l-3O
MODE CONTROL MOTORTest, page 21-28Repfacement, page 21'28
MODE CONTROL SWITCHTest, page 21'31
HEATER CONTROL PANELRepf acement, page 21 -25
Overhaul, page 21-26
TEMPERATURE CONTROLLEVER(Adjustmonl: See AIR MIXCONTROL CABLE}
SRS MAIN HARNESS
W,
21-2
I

UNOER - HOOO FUSE/REI.AY 8OX
Circuit Diagram
WtlT/BtK.+WtfT
UiIDEN - OASHFUSE/RETAY 8OX
RECIRCUI.ATIONcoMTBor- Moron
nrotG401
N0.13 (7.5A1
21-6
-]

Heater Unit
Replacement
CAUTION:
a All SRS electrical witing hame$os are covoed wlth
yollow insulation.
a Before disconnecting any patt of tho SRS wito har-
neas, connect tha shott connoctol(s|.
a Roplaco th€ enlire sffacted SRS harnosr a$smbly if
it has an opon cilcult or dsmaged wiring.
NOTE: The original radio h8s a coded theft protection
circuit. Be sure to get the customer's code number betors
- disconnecting the bafterY.
- removing the No. 32 (7.5 A) fuse from th€ under-
hood tuse/relav box.- removing the radio
After service. teconnect power to the radio and turn it
on, when the word "CODE" is displayed, enter the cus-
tomer's 5-digit code to restore radio operation.
1. When the engine is cool, dtain the engine coolant
from the radiator (see section 1O).
@@ oo not lomove tho radiator cap whan
the ongine is hol; tha ongino coolant is undot
pressure and could a€voralY tcald you.
2. Snap open the clamp and disconnect the heater
valve cable from the heater valve arm.
HEATER VALVE CABLE
21-22
CLAMFS
3. Disconnect the heater hoses from the heater unit'
CAUTIOII: Engino coobnt will damago paint. orick-
ly dnse any rpilled engine coolant from paintod
surfac63.
NOTE: Engine coolant will tun out when the hoses
are disconnected, drain it into a clean drip pan'
HEATER HOSES
Remove the mounting nut from the heater unit.
NOTE: When removing the mounting nut, take care
not to damage or bend the fuel pipes, brake pipes,
etc.
8 r 1,25 rn|n22 N.m 12.2 kgt.m, tO lbf'ftl
4.

Mode Control Motor
Test
Connect batterY power to the No. 4 terminsl of the
mode control motor and connect ground to the No'
8 terminal.
Using a jumper wire, short the No. 8 terminsl in-
dividually to the No. 1, 2, 3. 6 and 7 terminals, in
that order.
a Each time the short circuit is mad€, the mode con-
trol motor should run smoothly and stop.
NOTE: ll the mode control motor does not run when
shorting the tirst terminsl, short that t€rminal again
after shorting the other terminals.
The mode control motor is no.mal it it runs when
shorting the tirst terminal again.
lf the mode control motor does not run in step 2, re'
move it, and check ths mode control linkage 8nd
doors for smooth movement. It the mod€ control
linkage and doors move smoothly, replace th€ mod€
control motor.
Disconnoct ths mode control motot 8P connector,
and remove it from lhe heater unit.
Remove the two sclsws, mode control motot, and
flango coll8,.
MODE CONTROLiioroR
3. lnst8ll in tho rsvsrse order of removal. After inst8l-
lstion, make sur€ the modo control motor runs
smoothlv.
Replacement
21-28

lllustrated Index
CAUTION:
. All SRS electrical wiring harnossos are cover€d withyellow insulation.
. B€fors disconnacting any part of the SRS wire har-ness, connsct the 3hort connsctor(s).. Replace the entirs affscted SRS harness assembly itit has an open circuit or damaged wiring.
NOTE; The original radio has a coded theft protection
circuit. Be sure to get the customer's code number
before- disconnecting the battery.- removing the No.32 (7.5 A) fuse from the under-
hood fuse/relay box.- removing the radio.
After service, reconnect Dower to the radio and turn it
on. When the word "CODE" is displayed, enter the cus-
tomer's 5-digit code to restore radio operation.
SRS MAIN HARNESSlcover€d with yellow insulationl
EVAPORATORReplacement, page 22-26Ovethaul. Oase 22.27
SERVICE VALVE(LOW PRESSURE SIDEI
SERVICE VALVEIHIGH PRESSURE SIDE)
RECEIVER/DRYER
CONDENSERReplacement, page 22,37
A/C PRESSURE SWITCHCOMPRESSORReplacement, page 22-30When the refrigerant pressure is below 200 kpa (2.0kqflcm,,28 psi) due to refrigerant leakage or above 3]OOkPa (32 kgf/cm,, 460 psi) due to coolant btockage, the A,/Cpressure switch opens the circuit to the A"/C switch andstops the air conditionang to protect the compressor.
22-3

Circuit Diagram
N0.41 l10oAl No.39 {5OAlNo.1317,5A)
MOIATOR
REI.AY
22-5

Evaporator
Replacement
CATION:
. All SRS eloctrical wiring harnesses are coverod with
yollow in3ulation.
. B€tore disconnocting 8ny part of tho SRS wire har-
nsss, conngqt th€ 3hort connestor{sl.
. Roplaca ths entire aftected SRS harness a$embly if
it has an op€n circuit or damaged wiring.
lcove.ed with yellow insulation)
Recover the refrigerant with a Recovery/Recycling/
Charging System lsee page 22-22]-.
Femove the bolts, and disconnect the receiver line
and the suction line from the evaporator.
NOTE: Plug or cap the lines immediately after dis-
connecting to avoid moisture and dust contamina-
tion into the svstem.
2.
L
6x1.0mm9.8 N.m {1.019f.m,1.2 tbl.ttl
SUCTION LINE
RECEIVEB LINE
3.Remove the glove box (see section 20).
Remove the four bolts and the glove box frame.
Disconnect the connector from the Ay'C thermostat,
and remove the wire harness clips from the evapo-
rator.
Remove the four self-tapping screws, mounting bolt
and the mounting nut.
Disconnect the drain hose, and remove the evapo-
rator.
1.
6x1.0mmAPORATOR9.8Nm{1.0kg{.m,7.2 tbtft)
a
a
8. Install in the reverse order of removal. and:
it you're installing a new evaporator, add refrig-
erant oil (ND-OIL 8: P/N 38899 - PR7 - A01) (see
page 22-2'll.
replace the O-rings with new ones at each fitting.
and apply a thin coat of refrigerant oil (ND-OlL 8:
P/N 38899 - PR7 - A01l before installing them.
NOTE: Be sure to use the right o-rings for HFC-
134a {R-134a} to avoid leakage.
apply sealant to the grommets.
make sure that there is no air leakage.
charge the system (see page 22-39) and test its
performance (see page 22-241.
22-26