Rear Mode Control Motor Circuit Troubleshooting

WARNING: This page is about a different car, the 2008 Honda Pilot, 2007 Honda Pilot, and 2006 Honda Pilot. However, it is still accessible from the selected car via links, so may be relevant.

Check the No. 3 (7.5 A) fuse in the driver's under-dash fuse/relay box.
Is the fuse OK?

YES - Go to step 2.

NO - Replace the fuse and recheck.
Turn the ignition switch ON (II).
Measure the voltage between the No. 2 terminal of the rear mode control motor 7P connector and body ground.

Fig 1: Measuring Voltage Between No. 2 Terminal Of Rear Mode Control Motor 7P Connector & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES - Go to step 4.

NO - Repair open in the wire between the No. 3 fuse in the driver's under-dash fuse/relay box and the rear mode control motor.
Turn the ignition switch OFF.
Disconnect rear heater-A/C control switch connectors A (7P) and B (10P).
Disconnect rear heater-A/C control switch connectors A (7P) and B (10P).
Check for continuity between the No. 1 terminal of the rear mode control motor 7P connector and body ground.

Fig 2: Checking For Continuity Between No. 1 Terminal Of Rear Mode Control Motor 7P Connector & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Go to step 8.

NO - Check for an open in the wire between the rear mode control motor and body ground. If the wire is OK, check for ground at G501.
Check for continuity between the No. 7 terminal of the rear heater-A/C control switch connector B (10P) and body ground.

Fig 3: Checking For Continuity Between No. 7 Terminal Of Rear Heater-A/C Control Switch Connector B (10P) & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Go to step 9.

NO - Check for an open in the wire between the rear heater-A/C control switch connector and body ground. If the wire is OK, check for ground at G501.
Test the rear mode control motor (see REAR MODE CONTROL MOTOR TEST ).
Is the rear mode control motor OK?

YES - Go to step 10.

NO - Replace the rear mode control motor (see REAR MODE CONTROL MOTOR REPLACEMENT ).
Check for continuity between body ground and rear heater-A/C control switch connector B (10P) terminals No. 1, 2, 3, 4, 5 and 6 individually.

Fig 4: Checking For Continuity Between Body Ground & Rear Heater-A/C Control Switch Connector B (10P) Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Repair any short to body ground in the wire(s) between the rear heater-A/C control switch and the mode control motor.

NO - Go to step 11.
Turn the ignition switch ON (II), and check the same terminals for voltage.

Fig 5: Checking Voltage Between Body Ground & Rear Heater-A/C Control Switch Connector B (10P) Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there any voltage?

YES - Repair any short to power in the wire(s) between the rear heater-A/C control switch and the mode control motor. This short may also damage the rear heater-A/C control switch. Repair the short to power before replacing the rear heater-A/C control switch.

NO - Go to step 12.
Turn the ignition switch OFF.
Check for continuity between the following terminals of rear heater-A/C control switch connector B (10P) and the rear mode control motor 7P connector.
10P: 7P:

No. 1 No. 7

No. 2 No. 7

No. 3 No. 7

No. 4 No. 4

No. 5 No. 3

No. 6 No. 3

Fig 6: Checking Continuity Between Terminals Of Rear Heater-A/C Control Switch Connector B (10P) & Rear Mode Control Motor 7P Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Check for loose wires or poor connections at rear heater-A/C control switch connector B (10P) and at the rear mode control motor 7P connector. If the connections are good, substitute a known-good rear heater-A/C control switch, and recheck. If the symptom/indication goes away, replace the original rear heater-A/C control switch.

NO - Repair any open in the wire(s) between the rear heater-A/C control switch and rear mode control motor.