Mode Control Motor Circuit Troubleshooting

Check the No. 16 (7.5 A) fuse in the under-dash fuse/relay box.
Is the fuse OK?
1. YES -Go to step 2.
2. NO -Replace the fuse, and recheck.
Disconnect the mode control motor 7P connector.
Turn the ignition switch ON (II).
Measure the voltage between the No. 1 terminal of the mode control motor 7P connector and body ground.

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

Is there battery voltage?
1. YES -Go to step 5.
2. NO -Repair open in the wire between the mode control motor and the No. 16 (7.5 A) fuse in the under-dash fuse/relay box.
Turn the ignition switch OFF.
Test the mode control motor (see MODE CONTROL MOTOR TEST ).
Is the mode control motor OK?
1. YES -Go to step 7.
2. NO -Go to step 12.
Disconnect heater control panel connector B (22P).
Check for continuity between the No. 6, 9,10, 20, 21, and No. 22 terminals of heater control panel connector B (22P) and body ground individually.

Fig 2: Checking For Continuity Between No. 6, 9,10, 20, 21, And No. 22 Terminals Of Heater
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. YES -Repair any short to body ground in the wire(s) between the heater control panel and the mode control motor.
2. NO -Go to step 9.
Turn the ignition switch ON (II), and check the same terminals for voltage.

Fig 3: Checking Terminals For Voltage
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there any voltage?
1. YES -Repair any short to power in the wire(s) 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.
2. NO -Go to step 10.
Turn the ignition switch OFF.

Check for continuity between the following terminals of heater control panel connector B (22P) and the mode control motor 7P connector.

TERMINALS FOR CONTINUITY CHECK

22P:	7P:
No. 6	No. 7
No. 9	No. 6
No. 10	No. 5
No. 20	No. 2
No. 21	No. 3
No. 22	No. 4

Fig 4: Checking For Continuity Between Terminals

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Check for loose wires or poor connections at heater control panel connector B (22P) and at 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.
NO -Repair any open in the wire(s) between the heater control panel and the mode control motor.

Remove the mode contol motor (see MODE CONTROL MOTOR TEST ).
Check the mode control linkage and doors for smooth movement.
Do the mode control linkage and doors move smoothly?
1. YES -Replace the mode control motor.
2. NO -Repair the mode control linkage or doors.