Honda Civic Service Manual page 1396

Troubleshooting -'99 - 00 Models
Self-diagnosis Function
The heater control panel has a self-diagnosis function.
Running the Self-diagnosis Funqtion
Set the mode control dial to the Vent position, and turn the ignition switch ON fll). Within six seconds
after turnang the igni_
tion switch on. press the recirculation control switch the required number of times depending on
the recirculation indicator
light status:
. l f t h e i n d i c a t o r l i g h t i s O N , p r e s s t h e r e c i r c u l a t i o n c o n t r o l s w i t c h f i v e t r m e s .
. l f t h e i n d i c a t o r l i g h t i s O F F , p r e s s t h e r e c i r c u l a t i o n c o n t r o l
s w i t c h s i x r r m e s .
The recirculation indicator light will come on for two seconds. then blink the Diagnostic Trouble code
{DTc} to indicate a
faulty component. lf no DTc's are found, the indicator light will not blink after the initial two second
liqht.
DTC Indication Pattern (S6e DTC 2l:
Recirculation
indicato.
light on
Recirculation
indicator
light off
2 sec
,/
1.5 soc
t
' 0,3 sec
W i t h i n s i x s e c o n d s a t t e r t h e
ignition switch is turned ON (lll,
pross the recirculation control
switch the required number ot
times depending on the rocircu-
lation indicetor light status
0.3 sec
VENT POSITION
MODE CONTROL DIAL
RECIRCULATION
CONTROL SWTCH
DTC Troubleshooting Index
Diagnostic
trouble
code (DTCI
Rgcirculation
indicator light
Component with problem
Possible cause
See page
O n e b l i n k
Air mix control motor
Obstructed door, laulty motor
21-21
2
Two blinks
Air mix control motor
Open or short circuit
21-23
ln case of multiple problems, the recirculation indicator light will indicate only one DTc with the least number
of blinks.
Resetting the Self-diagnosis Function
Turning the ignition switch OFF will cancel the self-diagnosis function, After completing repair work, run the setf
diagnosis
function again to make sure that there are no other malfunctions.
21-20
@
At
V'