Honda Civic. Manual — part 752

CLEAR THE DTCS

When the problem is repaired, DTCs will automatically clear.

1

An open in the air mix control motor circuit (see DTC
INDICATOR 1: AN OPEN IN THE AIR MIX
CONTROL MOTOR CIRCUIT )

2

A short in the air mix control motor circuit (see DTC
INDICATOR 2: A SHORT IN THE AIR MIX
CONTROL MOTOR CIRCUIT )

3

A problem in the air mix control linkage, door, or motor
(see DTC INDICATOR 3: A PROBLEM IN THE
AIR MIX CONTROL LINKAGE, DOOR, OR
MOTOR )

4

An open or short in the mode control motor circuit (see
DTC INDICATOR 4: AN OPEN OR SHORT IN
THE MODE CONTROL MOTOR CIRCUIT )

5

A problem in the mode control linkage, doors, or motor
(see DTC INDICATOR 5: A PROBLEM IN THE
MODE CONTROL LINKAGE, DOORS, OR
MOTOR )

6

A problem in the blower motor circuit (see DTC
INDICATOR 6: A PROBLEM IN THE BLOWER
MOTOR CIRCUIT )

7

HVAC control unit internal error (see DTC
INDICATOR 7: HVAC CONTROL UNIT
INTERNAL ERROR )

8

An open in the evaporator temperature sensor circuit (see
DTC INDICATOR 8: AN OPEN IN THE
EVAPORATOR TEMPERATURE SENSOR
CIRCUIT )

9

A short in the evaporator temperature sensor circuit (see
DTC INDICATOR 9: A SHORT IN THE
EVAPORATOR TEMPERATURE SENSOR
CIRCUIT )

2008 Honda Civic EX

2006-08 HVAC Heating/Air Conditioning - Civic (All Except Hybrid)

MAX COOL POSITION FUNCTION

When the mode control button is in the MAX A/C position, the HVAC control unit
will automatically select the recirculation mode and turn the A/C on. If the
recirculation switch is pressed when in MAX A/C, MAX A/C turns off. If A/C is
pressed when in MAX A/C, the A/C turns off.

SYMPTOM TROUBLESHOOTING INDEX

SYMPTOM TROUBLESHOOTING INDEX

Symptom

Diagnostic procedure

Also check for

Recirculation
control doors
do not change
between Fresh
and
Recirculate

Recirculation control motor
circuit troubleshooting (see
RECIRCULATION
CONTROL MOTOR
CIRCUIT
TROUBLESHOOTING )

HVAC DTCs (see
GENERAL
TROUBLESHOOTING
INFORMATION )

Blown fuse No. 36 (10 A)
in the under-dash
fuse/relay box

Cleanliness and tightness
of all terminals

Blower, heater
controls, and
A/C do not
work

HVAC control power and
ground circuit troubleshooting
(see HVAC CONTROL
POWER AND GROUND
CIRCUIT
TROUBLESHOOTING )

HVAC DTCs (see
GENERAL
TROUBLESHOOTING
INFORMATION )

Blown fuse No. 36 (10 A)
in the under-dash
fuse/relay box

Poor ground at G504 (see
CONNECTOR TO
HARNESS INDEX )

Cleanliness and tightness
of all terminals

HVAC DTCs (see
GENERAL

2008 Honda Civic EX

2006-08 HVAC Heating/Air Conditioning - Civic (All Except Hybrid)

Both fans do
not run at low
speed with the
A/C on (but
the A/C
compressor
runs with the
A/C on)

Radiator and A/C condenser
fan low speed circuit
troubleshooting (see
RADIATOR AND A/C
CONDENSER FAN LOW
SPEED CIRCUIT
TROUBLESHOOTING )

TROUBLESHOOTING
INFORMATION )

Blown fuse No. 7 (20 A:
M/T) or (30 A: A/T) in the
under-hood fuse/relay box,
and No. 36 (10 A) in the
under-dash fuse/relay box

Poor ground at G301 (see
CONNECTOR TO
HARNESS INDEX )

Cleanliness and tightness
of all terminals

The A/C
condenser fan
does not run at
high speed
(but both fans
run at low
speed and the
A/C
compressor
operates with
the A/C on)

A/C condenser fan high speed
circuit troubleshooting (see
A/C CONDENSER FAN
HIGH SPEED CIRCUIT
TROUBLESHOOTING )

HVAC DTCs (see
GENERAL
TROUBLESHOOTING
INFORMATION )

Blown fuse No. 6 (20 A)
and No. 15 (7.5 A) in the
under-hood fuse/relay box

Poor ground at G301 (see
CONNECTOR TO
HARNESS INDEX )

Cleanliness and tightness
of all terminals

A/C pressure sensor
troubleshooting (R18A1
engine): A/C pressure sensor
circuit low voltage (see DTC
P0532: A/C PRESSURE
SENSOR CIRCUIT LOW
VOLTAGE ), A/C pressure
sensor circuit high voltage (see
DTC P0533: A/C
PRESSURE SENSOR

2008 Honda Civic EX

2006-08 HVAC Heating/Air Conditioning - Civic (All Except Hybrid)

Both fans do
not run at high
speed with the
A/C on (but
both fans run
at low speed
and the A/C
compressor
operates with
the A/C on)

CIRCUIT HIGH
VOLTAGE )
A/C pressure sensor
troubleshooting (K20Z3
engine): A/C pressure sensor
circuit low voltage (see DTC
P0532: A/C PRESSURE
SENSOR CIRCUIT LOW
VOLTAGE ), A/C pressure
sensor circuit high voltage (see
DTC P0533: A/C
PRESSURE SENSOR
CIRCUIT HIGH
VOLTAGE )
ECT troubleshooting (R18A1
engine): ECT sensor 2 circuit
low voltage (see DTC P2184:
ECT SENSOR 2 CIRCUIT
LOW VOLTAGE ), ECT
sensor 2 circuit high voltage
(see DTC P2185: ECT
SENSOR 2 CIRCUIT HIGH
VOLTAGE )
ECT troubleshooting (K20Z3
engine): ECT sensor circuit
low voltage (see DTC P2184:
ECT SENSOR 2 CIRCUIT
LOW VOLTAGE ), ECT
sensor circuit high voltage (see
DTC P2185: ECT SENSOR 2
CIRCUIT HIGH
VOLTAGE )

Powertrain DTCs, R18A1
engine (see GENERAL
TROUBLESHOOTING
INFORMATION ),
K20Z3 engine (see
GENERAL
TROUBLESHOOTING
INFORMATION )

Cleanliness and tightness
of all terminals

The A/C

HVAC DTCs (see
GENERAL
TROUBLESHOOTING

2008 Honda Civic EX

2006-08 HVAC Heating/Air Conditioning - Civic (All Except Hybrid)