Honda Civic. Manual — part 757

8. Check for continuity between body ground and the HVAC control panel 24P

connector terminals No. 19 and 20 individually.

Fig. 19: Checking Continuity Between Ground & HVAC Control Panel
Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

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

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

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

1. Clear the DTC (see CLEAR THE DTCS ).

2008 Honda Civic EX

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

2. Turn the ignition switch to LOCK (0), and then ON (II).
3. Do the self-diagnostic with the HVAC control unit (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 AIR MIX CONTROL MOTOR
REPLACEMENT ).

7. Disconnect the mode control motor 7P connector.
8. Disconnect the HVAC control unit 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

5

4

6

3

13

7

2008 Honda Civic EX

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

Fig. 20: Checking Continuity Between HVAC 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 HVAC 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.

2008 Honda Civic EX

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

Fig. 21: Checking Continuity Between Ground & HVAC 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 HVAC control
panel and the mode control motor.

NO -Go to step 11.

11. Check for continuity between the HVAC control unit 24P connector terminals

as follows.

HVAC CONTROL UNIT 24P CONNECTOR TERMINALS

Is there continuity between any of the terminals?

From terminal

To terminals

3

4, 5, 6, 13, 14

4

5, 6, 13, 14

5

6, 13, 14

6

13, 14

2008 Honda Civic EX

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