Rear Mode Control Motor Circuit Troubleshooting

WARNING: This page is about a different car, the 2011 Honda Pilot, 2010 Honda Pilot, and 2009 Honda Pilot. However, it is still accessible from the selected car via links, so may be relevant.

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

YES - Go to step 5.

NO - Replace the fuse, and recheck. If the fuse blows again, check for a short in the No. 36 (10A) fuse circuit. ■
Turn the ignition switch to ON (II).
Measure the voltage between rear mode control motor 7P connector terminal No. 1 and body ground.
Is there battery voltage?

YES - Go to step 4.

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

Fig 1: Measuring Voltage Between Rear Mode Control Motor 7P Connector Terminal No. 1 & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Turn the ignition switch to LOCK (0).
Disconnect the rear mode control motor 7P connector.
Test the rear mode control motor (see REAR AIR MIX CONTROL MOTOR REPLACEMENT ).
Is the rear mode control motor OK?

YES - Go to step 7.

NO - Replace the rear mode control motor (see REAR MODE CONTROL MOTOR REPLACEMENT ), or repair the rear mode control linkage or door. ■
Disconnect HVAC control unit connector A (24P).
Check for continuity between body ground and HVAC control unit connector A (24P) terminals No. 1 and No. 2 individually.
Is there continuity?

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

NO - Go to step 9.

Fig 2: Checking Continuity Between Body Ground & HVAC Control Unit Connector A (24P) Terminals No. 1 & No. 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Turn the ignition switch to ON (II), and check the same terminals for voltage to body ground.
Is there any voltage?

YES - Repair short to power in the wire(s) between the HVAC control unit and the rear mode 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.

Fig 3: Checking Continuity Between Body Ground & HVAC Control Unit Connector A (24P) Terminals No. 1 & No. 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Turn the ignition switch to LOCK (0).
Check for continuity between the following terminals of HVAC control unit connector A (24P) and the rear mode control motor 7P connector.
24P: 7P:

No. 1: No. 5

No. 2: No. 7

Is there continuity?

YES - Check for loose wires or poor connections at HVAC control unit connector A (24P) and at the rear mode control motor 7P connector. If the connections are good, substitute a known-good HVAC control unit, and recheck. If the symptom/indication goes away, replace the original HVAC control unit (see HVAC CONTROL UNIT REMOVAL/INSTALLATION ). ■

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

Fig 4: Checking Continuity Between Terminals Of HVAC Control Unit Connector A (24P) & Rear Mode Control Motor 7P Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.