Honda Civic. Manual — part 735

symptom/indication goes away, replace the original heater control panel.

DTC INDICATOR 4: AN OPEN OR SHORT IN THE MODE CONTROL MOTOR CIRCUIT

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 4 indicated?

YES -Go to step 5.

NO -Intermittent failure, check for loose wires or poor connections on the
mode control motor circuit.

5. Turn the ignition switch to LOCK (0).
6. Test the mode control motor (see MODE CONTROL MOTOR TEST ).

Is the mode control motor OK?

YES -Go to step 7.

NO -Replace the mode control motor (see MODE CONTROL MOTOR
TEST ).

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

panel 24P connector and the mode control motor 7P connector.

CONTINUITY CHECK INDEX

24P

7P

3

6

4

5

2008 Honda Civic EX

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

Fig. 11: Checking Continuity Between Heater Control Panel Connector &
Mode Control Motor Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to step 10.

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

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

connector terminals No. 3, 4, 5, 6, and 13 individually.

5

4

6

3

13

7

2008 Honda Civic EX

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

Fig. 12: 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 mode control motor.

NO -Go to step 11.

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

as follows.

TERMINALS REFERENCE

Is there continuity between any of the terminals?

From terminal

To terminals

3

4, 5, 6, 13

4

5, 6, 13

5

6, 13

6

13

2008 Honda Civic EX

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

YES -Repair the short in the wires.

NO -Go to step 12.

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

body ground. See Fig. 12.

Is there any voltage?

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

NO -Check for loose wires or poor connections at the heater control panel 24P
connector and at the mode control motor 7P connector. If the connections are
good, substitute a known-good heater control panel, and recheck. If the
symptom/indication goes away, replace the original heater control panel.

DTC INDICATOR 5: A PROBLEM IN THE MODE CONTROL LINKAGE, DOORS, 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 5 indicated?

YES -Go to step 5.

NO -Intermittent failure.

5. Turn the ignition switch to LOCK (0).
6. Test the mode control motor (see MODE CONTROL MOTOR TEST ).

Is the mode control motor OK?

YES -

2008 Honda Civic EX

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