Honda Civic Service Manual page 780

Heating and Air Conditioning
General Troubleshooting Information
How to Retrieve a DTC
The heater control panel has a self-diagnosis function. To run the self-diagnosis function, do the following:
1 . T u r n t h e f a n s w i t c h O F F .
2. Pressand holdthe recirculation control switch andthe rear window defoooer switch down.
3 . T u r n t h e i g n i t i o n s w i t c h o N { l l i .
4. Release both switches. The recirculation indicator and the rear window defogger indicator come on. The
recirculation indicator goes off 3 seconds later and the Ay'C indicator comes on. then the self-diagnosis will begin.
About 10 seconds later, the self-diagnosis will finish and the A,/C indicator goes off.
. l f a n y t r o u b l e i s f o u n d . t h e r e c i r c u l a t i o n i n d i c a t o r b l i n k s t h e d i a g n o s t i c t r o u b l e c o d e ( D T C ) t o i n d i c a t e a f a u l t y
circuil or comDonent.
. lf the system is OK, the recirculation indicator stays off.
atc
@ r
RECIRCULATION
CONTROL SWITCH
BECIRCULATION
INDICATOB
/A\
-:@
INOICATOR
REAR WINDOW
OEFOGGER INDICATOR
REAR WINDOW
DEFOGGER SWITCH
Examole of DTC indication Pattern IDTC 7)
DTC 7
Reseiting the Selt-diagnosis Function
Turn the ignition switch OFF to cancel the self-diagnosis function. After completing repair work, run the self-diagnosis
f u n c t i o n a o a i n t o m a k e s u r e t h a t t h e r e a r e n o o t h e r m a l f u n c t i o n s .
Recirculation +
indicatot
R e c i r c u l a t i o n +
indicalor
go6s oft
----->
21-8