Recirculation Control Motor Circuit Troubleshooting

Check the No. 30(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. 30 (10 A) fuse circuit. ■
Disconnect the recirculation control motor 7P connector.
Turn the ignition switch to ON (II).
Measure the voltage between recirculation control motor 7P connector terminal No. 1 and body ground.

Fig 1: Measuring Voltage Between Recirculation Control Motor 7P Connector Terminal 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. 30 (10 A) fuse in the under-dash fuse/relay box and the recirculation control motor. ■
Turn the ignition switch to LOCK (0).
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. ■
Disconnect the HVAC control unit 30P connector.
Check for continuity between body ground and HVAC control unit 30P connector terminals No. 13 and No. 14 individually.

Fig 2: Checking Continuity Between Body Ground And HVAC Control Unit 30P Connector Terminals 13 And 14
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Repair short to body ground in the wire(s) between the HVAC control unit and the recirculation control motor. ■

NO -Go to step 9.
Turn the ignition switch to ON (II), and check the same terminals for voltage between the terminals and body ground.

Fig 3: Checking Voltage Between Terminals And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there any voltage?

YES -Repair short to power in the wire(s) between the HVAC control unit and the recirculation control motor. This short may also damage the HVAC control unit. Repair the short to power before replacing the HVAC control unit. ■

NO -Go to step 10.
Turn the ignition switch to LOCK (0).

Check for continuity between the following terminals of the HVAC control unit 30P connector and the recirculation control motor 7P connector.

30 Pin Connector Terminal No.	7 Pin Connector Terminal No.
13	7
14	5

Fig 4: Checking Terminals Of HVAC Control Unit 30P Connector And Recirculation Control Motor 7P Connector

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Check for loose wires or poor connections at the HVAC control unit 30P connector and the recirculation control motor 7P connector. If the connections are good, substitute a known-good HVAC control unit (see HVAC CONTROL UNIT REMOVAL/INSTALLATION ), and recheck. If the symptom/indication goes away, replace the original HVAC control unit. ■

NO -Repair open in the wire(s) between the HVAC control unit and the recirculation control motor. ■