Dtc Troubleshooting - Honda Civic Service Manual

Heating and Air Conditioning
DTC Troubleshooting
DTC 7: An Open in the Air Mix Control Motor
Circuit
1. Test the air mix control motor {see page 2'l-341.
ls the air mix control motor OK?
YES-Go to step 2.
N O - R e p l a c e t h e a i r m i x c o n t r o l m o t o r . l
2. Disconnect the air mix control motor 5P connector.
3. Disconnect heater control panel connectors A {14P)
a n d B ( 2 2 P ) .
4. Check for continuity between the following
terminals of heater control panel connectors A
(14P) and B (22P) and the air mix control motor 5P
connector,
1 4 P : 5 P :
N o . 1 N o . 5
N o . 2
N o . 4
N o . 3
N o . 2
N o . 9 N o . 1
22P: 5P:
N o . 6 N o . 3
Wire side ol lem.letehi.6ls
ls there continuity?
YES-Check for loose wires or poor connections at
heater control oanel connectors A (14P) and B (22P)
and at the air mix control motor 5P connector. lf the
connections are good. substitute a known-good air
mix control motor, and recheck, lf the symptom/
indication goes away, replace the original air mix
control motor. lf the symptom/indication continues,
substitute a known-good heater control panel, and
recheck. lf the symptom/indication goes away,
replace the original heater control panel.l
N O R e p a i r a n y o p e n i n t h e w i r e ( s ) k e t w e e n t h e
heater control panel and the air mix control
motor.l
21-16
DTC 8: A Short in the Air Mix Control Motor
Circuit
1. Test the air mix control motor(see page 21-341.
ls the ait mix control motor OK?
YES-Go to step 2.
NO-Replace the air mix contorol motor.I
2. Disconnect the air mix control motor 5P connector.
3. Disconnect heater control panel connectors A (14P)
a n d B ( 2 2 P ) .
4. Check for continuity between body ground and
heater control panel connector A (14P) terminals
No. 1, 2, 3, and 9 individually, and between body
ground and heater control panel connector B (22P)
t e r m i n a l N o . 6 .
HEATERCONTROL PANEL CONNECTOR A {I4PI
HEATER CONTFOL PANELCONNECTOR B I22P1
ls therc continuity?
Y E S - R e p a i r a n y s h o r t t o b o d y g r o u n d l n t h e
wire(s) between the heater control panel and the air
mix control motor.l
N O - G o t o s t e p 5 .
W i r e s i d e o f f e m a l e t e r m i n a l s
W i r e s i d e o i l e m a e l e r m i n a l s