Honda Civic. Manual — part 738

and body ground.

Fig. 22: Measuring Voltage Between Blower Motor Relay 4P Socket
Terminal No 1 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES -Go to step 33.

NO -Replace the under-hood fuse/relay box (see REMOVAL AND
INSTALLATION ).

33. Turn the ignition switch ON (II).
34. Measure the voltage between the blower motor relay 4P socket terminal No. 3

and body ground.

Fig. 23: Measuring Voltage Between Blower Motor Relay 4P Socket
Terminal No 3 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

2008 Honda Civic EX

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

Is there battery voltage?

YES -Go to step 35.

NO -Repair open in the wire between the No. 36 (10 A) fuse in the under-dash
fuse/relay box and the blower motor relay.

35. Turn the ignition switch to LOCK (0).
36. Check for continuity between the blower motor relay 4P socket terminal No. 4

and body ground.

Fig. 24: Checking Continuity Between Blower Motor Relay 4P Socket
Terminal No 4 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Repair open in the WHT wire between the blower motor relay and the
blower motor.

NO -Check for an open in the wire between the blower motor relay and body
ground. If the wire is OK, check for poor ground at G301 (see CONNECTOR
TO HARNESS INDEX ).

DTC INDICATOR 7: HEATER CONTROL PANEL INTERNAL ERROR

NOTE:

Check the battery condition (see BATTERY TEST ) and the
charging system (see CHARGING SYSTEM INDICATOR
CIRCUIT TROUBLESHOOTING ).

2008 Honda Civic EX

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

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 7 indicated?

YES -The heater control panel is faulty, replace the heater control panel (see
HEATER CONTROL PANEL REMOVAL AND INSTALLATION ).

NO -Intermittent failure, the heater control panel is OK at this time.

RECIRCULATION CONTROL MOTOR CIRCUIT TROUBLESHOOTING

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

Is the fuse OK?

YES -Go to step 2.

NO -Replace the fuse, and recheck. If the fuse blows again, check for a short in
the No. 36 (10 A) fuse circuit.

2. Disconnect the recirculation control motor 7P connector.
3. Turn the ignition switch ON (II).
4. Measure the voltage between the recirculation control motor 7P connector

terminal No. 1 and body ground.

2008 Honda Civic EX

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

Fig. 25: Measuring Voltage Between Recirculation Control Motor 7P
Connector Terminal No 1 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES -Go to step 5.

NO -Repair open in the wire between the No. 36 (10 A) fuse in the under-dash
fuse/relay box and the recirculation control motor.

5. Turn the ignition switch to LOCK (0).
6. Test the recirculation control motor (see RECIRCULATION CONTROL

MOTOR TEST ).

Is the recirculation control motor OK?

YES -Go to step 7.

NO -Replace the recirculation control motor (see RECIRCULATION
CONTROL MOTOR TEST ), or repair the recirculation control linkage or
door.

7. Disconnect the heater control panel 24P connector.
8. Check for continuity between body ground and the heater control panel 24P

connector terminals No. 16 and No. 17 individually.

Fig. 26: Checking Continuity Between Body Ground And Heater Control
Panel 24P Connector Terminals No 16 And 17

2008 Honda Civic EX

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