Honda Civic. Manual — part 734

Fig. 8: Checking Continuity Between Ground & Heater Control Panel
Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Repair any short to body ground in the wires between the heater control
panel and the air mix control motor.

NO -Go to step 10.

10. Check for continuity between the heater control panel 24P connector terminals

as follows.

TERMINALS REFERENCE

Is there continuity between any of the terminals?

YES -Repair the short in the wires.

NO -Go to step 11.

From terminal

To terminals

1

13,18

13

18

2008 Honda Civic EX

2006-08 HVAC Heating - Civic (All Except Hybrid)

11. Turn the ignition switch ON (II), and check the same terminals for voltage to

body ground. See Fig. 8.

Is there battery voltage?

YES -Repair any short to power in the wires between the heater control panel
and the air mix control motor. This short may also damage the heater control
panel. Repair the short to power before replacing the heater control panel.

NO -Substitute a known-good heater control panel, and recheck. If the
symptom/indication goes away, replace the original heater control panel.

DTC INDICATOR 3: A PROBLEM IN THE AIR MIX CONTROL LINKAGE, DOOR, OR MOTOR

1. Clear the DTC (see CLEAR THE DTCS ).
2. Turn the ignition switch to LOCK (0), and then ON (II).
3. Do the self-diagnostic with the heater control panel (see HOW TO USE THE

SELF-DIAGNOSTIC FUNCTION ).

4. Check for DTCs.

Is DTC 3 indicated?

YES -Go to step 5.

NO -Intermittent failure.

5. Turn the ignition switch to LOCK (0).
6. Test the air mix control motor (see AIR MIX CONTROL MOTOR TEST ).

Is the air mix control motor OK?

YES -Substitute a known-good heater control panel, and recheck. If the
symptom/indication goes away, replace the original heater control panel.

NO -Replace the air mix control motor (see AIR MIX CONTROL MOTOR
TEST ), or repair the air mix control linkage or door.

2008 Honda Civic EX

2006-08 HVAC Heating - Civic (All Except Hybrid)

7. Disconnect the air mix control motor 7P connector.
8. Disconnect the heater control motor 24P connector.
9. Check for continuity between the following terminals of the heater control

panel 24P connector and the air mix control motor 7P connector.

CONTINUITY CHECK INDEX

Fig. 9: Checking Continuity Between Heater Control Panel Connector &
Air Mix Control Motor Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

24P

7P

19

2

20

1

2008 Honda Civic EX

2006-08 HVAC Heating - Civic (All Except Hybrid)

YES -Go to step 10.

NO -Repair any open in the wires between the heater control panel and the air
mix control motor.

10. Check for continuity between body ground and the heater control panel 24P

connector terminals No. 19 and 20 individually.

Fig. 10: Checking Continuity Between Ground & Heater Control Panel
Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Repair short to body ground in the wires between the heater control
panel and the air mix control motor.

NO -Substitute a known-good heater control panel, and recheck. If the

2008 Honda Civic EX

2006-08 HVAC Heating - Civic (All Except Hybrid)