1999 HONDA CR-V Air mix

Self-diagnosis Function
The heater control panel has a self-diagnosis function.
Running the Self-diagnosis Function'97 mod€l:
Turn the ignition switch ON {ll), then set the mode control dial to the Vent position, and the recirculation controt switch toRecirculate {recirculation indicator light comes on). Press and hold the recirculation control switch to Fresh (recirculation indi-cator light goes off). Continue to hold the switch; the recirculation indicator light will come on for two seconds. then it willblink the Diagnostic Trouble Code (DTC) to indicate a iaulty component. lf no DTC'S are found, the indicator liqht will notblink atter the initial two second light.
'98 - 00 models:
Set the mode control dial to the Vent position, and turn the ignition switch ON (ll). Within six seconds after turning the igni-tion switch on, press the recirculation control switch the required number of times depending on the recirculation indicatorlight status:
.lftheindicatorlightisON,presstherecirculationcontrol switch five times..lftheindicatorlightisOFF,presstherecirculationcontrol switch six I|mes.The recirculation indicator light will come on for two seconds, then blink the Diagnostic Trouble Code (DTC) to indicate afaulty component. lf no DTC'S are found, the indicator light will not blink after the initial two second liqht.
DTC Indicaiion Pattern {See DTC 3}:
Rocirculationindicatorlight on
Recirculrtionindicatorlighi off'97 model:P.ess and hold th6 recircul.tioncontrol switch'98 - 00 modek:Within six second3 atter theignition switch b turned ON (lll.Prass the rocirculation controlswitch the required number oltimes depending on the r6circu-lation indicator light striu3
,r*
/1.5 aaa 0.3 aac
RECIRCULANONINDICATOR LIGHT
In case of multiple problems, the recirculation indicator light indicate only one DTC that is the least number of blinks.
Resetiing the Solf.diagnosis Funqtion
Turning the ignition switch OFF will cancel the self-diagnosis function. After service work, run the self-diaqnosis functiononce again to check that there is no other Droblem.
MODE CONTROL OIAL
Diagnostic
trouble
code {DTCI
R6circulation
indicator lightComponent with problsmPossiblo causcSee page
'lOne blinkAir mix control molorOpen or short circuit, obstructed door,
faulty motor22-12
2Two blinksElower motorOpen or short circuit, faultv motor22-14,16
Three blinksEvaporator temperature sensorOpon or short circuit, faulty sensor22-20
t
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Troubleshooting
Air Mix Control Motor
Recirculation indicator light indicates Diagnostic Trouble Code (DTC) 1: A problem in the air mix control motor circuit.
The air mix control motor regulates the mixture of cool/hot air according to outputs from the heater control panel.
Selt-diagnosis circuit check indi-cates a Droblem in the air mixcontrol motor circuil.
Chock the air mix control moior:1. Disconnect the air mix controlmotor 5P connector,2, Test the air mix control motor(see page 22-43).
Check the air mix control linkagoand doors:1. Remove the air mix controlmotor (see page 22'43).2. Check the air mix control linkage and doors for smooth
ls the air mix control motor OK?
Do the air mix control linkage anddoors move smoothly?
Reolacelhe air mix conlrol motor.
Check Ior a short in the wires:1- Remove the heater controlpanel (see page 22-46).2. Check tor continuity betweenbody ground and the heatercontrol panel 20P connectorterminals No. 1, 6, 9, 17 and18 individually.
Ropair any short in the wire(s)betwoon th. heater co.rtrol panel
and the air mix conlrol motor.
HEATER CONTROL PANEL 2OP CONNECTOR
PNK/BLK
RED/BLU
Wire side of female terminals
To page 22-13
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Ftom page 22.12HEATER CONTROL PANEL 2OP CONNECTOR
Wire side ol female terminals
Check tor a short to poweriCheck the same terminals forvoltage.
Repair shon lo power in the wi.ebetween the heater control paneland the air mix control motor,(This damages the heater controlDanel.l
Check tor an open in the wires:Check for continuity between fol-lowing terminals of the heatercontrol panel 20P connector andthe air mix control motor 5P con-nector,zOPi 5P:No. 1 - No.3No.6 _ No. 4No.g _ No.2No. 17 _ No.5No. 18 _ No. 1
Repair any open in the wire{s)betweon the heater control panel
and air mix control motor.
Check toa loos€ wir63 or poorconnections rl the heater controlpanel 20P connector and st theair mix control motor 5P connsc-tor. lJ the connections aro good,substitute a known-good hoatercontrol panel, and rechock. I thesymptom/indication goes away,..pl.ce the original heater con-trol panel.
REO/8LURED/YEL
RED/YEL
AIR MIX CONTROL MOTOR5P CONNECTORWire side of female terminals
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Troubleshooting
Heater Control Panel Input/Output Signals
HEATER CONTROL PANEL CONNECTORS
8P CONNECTOR
Wire side of female terminals
2OP CONNECTOR
8P CONNECTOR
Cavitylrvire cololSignalCavityWire cololSignal
'lBLK/TE LIG2 (POWER)INPUTREDDASH LIGHTS ERIGHT-
NESS CONTROLLERCUTPUT
2GRN/REDRECIRCULATEINPUTRE D/BLK
COMBINATION LIGHT
SWITCH (Via No. 30 (7.5 A)
fuse)
INPUT
GRN/VVHTFRESHINPUT1BLKGROUNDOUTPUT
BLUI/ELREAR WINDOW
DEFOGGER RELAYCUTPUT8BLU/BLKBLOWER FEEDBACKINPUT
20P CONNECTOR
CavityWire colorSignalCavityWire colorSignal
1GRYAIR MIX POTENTIAL +5VOUTPUT'llWHT/BLUBACK PU (POWER)INPUT
2GRNEVAPORATOR TEMPERA.
TURE SENSOROUTPUT12YELMODE HEAT/DEFINPUT
13BLU/BLKMODE HEATINPUT
14GRN/YELMODE HEAT/VENTINPUT
ICYEUREDMODE VENTINPUT
6PNI(BLKAIR MIX POTENTIALINPUTtoYEUBLUMODE DEFINPUT
717RED/BLUAIR MIX COOLOUTPUI
8ORNrur'HTBLOWER MOTOR HIGH
RELAYINPUT18RE D/VE LAIR MIX HOTOUTPUI
BRNSENSOR GROUNDINPUT'19BRNA/VHTIVIODE MOTOR GROUNDINPUT
10BLU,ryVHTA"/C PRESSURE SWITCHINPUT20T GRN/BLKPOWER TRANSISTOR BASECUTPUT
22-40
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Air Mix Gontrol Motor
Replacement
1. Disconnect the 5P connector from the air mix con-
trol motor. Remove the self-tapping screws, the air
mix control motor and the flange collar.
AIR MIXCONTROLMOTOR
A
6
Install in the reverse order of removal. After installa-
tion. make sure the air mix control motor runs
smoothlv.
5P CONNECTOR
22-43
Test
1.Disconnect the 5P connector from the air mix con-
trol motor.
Connect battery power to the No. I terminal of the
air mix control moto., and ground the No, 5 termi-
nal; the air mix control moto. should run, and stop
at MAX HOT. lf it doesn't, reverse the connections;
the air mix control motor should run, and stoo at
MAX COOL.
lf the air mix control motor does not run, remove
it, then check the air mix control linkage and
doors for smooth movement.
lf they move smoothly, replace the air mix con-
trol motor.
AIR MIX CONTROL MOTOR
4.
Measure the resistance between the No. 2 and No. 3
terminals. lt should be approximately 6 kO t 20%.
Measure the resistance between the No. 2 and No, 4
terminals, lt should be approximately 4.8 kO:t 20% at
MAX HOT and approximately '1.2 kO t 20% at lilAx
cooL.
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4. Disconnect the heater hoses from the heater unit.
Engine coolant will run out when the hoses are dis-
connected; drain in into a clean drip pan.
CAUTION: Engino coolant will damage p8int. Ouickly
rinse any spill€d engine coolant Itom painted sur-
faces.
HEATER HOSEIOUTLET SIDE)
Remove the mounting nut from the heater unit.
Take care not to damage or bend the fuel lines, the
brake lines. etc.
CLAMPS
13 N.m 11.3 kg{.m,9.4 lbtftl
22-51
7.
ll.
Remove the dashboard (see section 20).
Remove the evaporator (see page 22-48).
Disconnect the connectors from the mode control
motor and the air mix control motor, and remove the
wire harness clips and wire harness from the heater
unit. Remove the clip from the heater duct, then
remove the mounting nuts and the heater unit
6x1.0mm9,8 N.m (1.0 kgt m,7.2lblft)
qInstall in the reverse order of removal. Make note of
the following items.
a
a
a
a
Apply sealant to the grommets.
Do not interchange the inlet and outlet heater
hoses. Make sure that the clamps are secure.
Refill the cooling system with engine coolant
{see section 10).
Adiust the heater valve cable (see page 22-53).
Make sure that there is no air leakage.
HEATER UNIT
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Temperature Control
Adjustment
l. From under the hood, open the cable clamp, then
disconnect the heater valve cable from the heater
vatve arm.
From under the dash, disconnect the heater valve
cable housing from the cable clamp. and disconnect
the heater valve cable from the air mix contlol arm
Set the temperature control dial on MAX COOL with
the ignition switch ON (ll).
Attach the heater valve cable to the air mix control
arm as shown above. Hold the end of the heater
valve cable housing against the stop, then snap the
heater valve cable housing into the cable clamp.
HEATER VALVE ARM
HEATER VALVE CABLE
5. From under the hood. turn the heater valve arm to
the fullv closed position as shown, and hold it.
Attach the heater valve cable to the heater valve
arm, and gently pull on the heater valve cable hous-
ing to take up any slack, then install the heate. valve
cable housing into the cable clamp.
HEATER VALVE ARM
HEATER VALVE CABLE
22-53
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A/C Service Tips and Precautions
The air conditioner system uses HFC-'134a (R-134a) refrigerant and polyalkyleneglycol {PAG) refrigerant oil*, which are not
compatible with CFC-12 (R-12) refrigerant and mineral oil. Do not use R-12 refrigerant or mineral oil in this system, and do
not attempt to use R-12 servicing equipmenu damage to the air conditioner system or your servicing equipment will
resutr.
*KEIHIN SP-10:
. P/N 38897 - Pl3 - A01AH: 120 m{ (4 fl.oz, il.2 lmp.oz)
. P/N 38899 - Pl3 - A01: 40 mf 11113tl.oz,1.4 lmp.oz)
Use only service equipment that is U.L.-listed and is certified to meet the requirements of SAE J2210 to remove R-134a
from the air conditioner system,
CAUTION: Exposure to air conditioner refrigerant and lubricant vapor or misl can irritats eyes, nose and throat. Avoid
breathing the air conditioner refrigerant and lubricant vapor or mist,
lf accidental system discharge occurs, ventilate work area before resuming service.
R 134a service equipment or vehicle air conditioner systems should not be pressure tested or leak tested with compressed
air.
E@ Some mixtures of air and R-13,1a have been shown to be combustible at elevat€d pressures and can result
in fire or explosion causing iniury or property damage. Never use complessed air to pressure test R-l3,[a service equip-
ment or vehicle air conditioner systems.
Additional health and safety information may be obtained from the refrigerant and lubricant manufacturers.
1. Always disconnect the negative cable from the battery whenever replacing air conditioning parts.
2. Keep moisture and dust out of the system. When disconnecting any lines, plug or cap the fittings immediately; don't
remove the caps or plugs until just before you reconnect each line.
3. Before connecting any hose or line. apply a few drops of refrigerant oilto the O-ring,
4. When tightening or loosening a fitting, use a second wrench to support the matching fitting.
5. When discharging the system, use a R l34a refrigerant recovery/recycling/charging station; don't release refrigerant
into the atmosphere.
6. Add refrigerant oil after replacing the following parts.
Note these items when handling refrigerant oil:
o To avoid contamination, do not return the oil to the container once dispensed, and never mix it with other refriger-
ant oils.
. lmmediately after using the oil, replace the cap on the container, and seal it to avoid moisture absorption.
. Do not spill the refrigerant oil on the vehicle; it may damage the painu if the refrigerant oil contacts the paint, wash
it off immediately.
Condenser . 25 ml (5/6 tl.oz, 0.9 lmp.oz)
Evaporator.,................................40 m/ 11 113ll.oz,l.4 lmp.ozl
Line or hose ........... 10 ml (1/3 fl.oz, 0.4 lmp.oz)
Receiver/Dryer....... 10 ml (1/3 fl.oz, 0.4 lmp.oz)
Leakage repair............................ 25 m/ (5/6 ll.oz, 0.9 lmp.oz)
Compressor.......,..., For compressor replacement, subtract the volumg ol oil drained from the removed
compressor from 130 m{ (4 113 tl.oz, 1,6lmp.ozl, and drain the calculatsd volume of
oif from the now comprossor: 130 ml (,1 113 tl,oz, 1.6lmp'ozl - Volume of removed
compressor = Volume to drain from new compressor.
NOTE: Even if no oil is drained trom the removed compressor, don't drain more than
50mt 11 213ll,oz,1.8 lmp.oz) from the newcompressor.
22-54I
rso m r rr:0.o., r.s r-o.o.t
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