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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.

Turn the ignition switch to LOCK (0).
Disconnect climate control unit connector B (20P) and audio unit connector D (20P).
Check for continuity between the following terminals of climate control unit connector B (20P) and audio unit connector D (20P).
20P: 20P:

No. 1: No. 7

No. 8: No. 6

Is there continuity?

YES - Go to step 4

NO - Repair open in the wire between the climate control unit and the audio unit. ■

Fig 1: Checking Continuity Between Terminals Of Climate Control Unit Connector B (20P) & Audio Unit Connector D (20P)
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Check for continuity between body ground and climate control unit connector B (20P) terminals No. 1 and No. 8 individually.
Is there continuity?

YES - Repair short to body ground in the wire(s) between the climate control unit and the audio unit. ■

NO - Go to step 5.

Fig 2: Checking Continuity Between Body Ground & Climate Control Unit Connector B (20P) Terminals No. 1 & No. 8
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Reconnect climate control unit connector B (20P).
Connect audio unit connector D (20P) terminals No. 6 and No. 7 with a jumper wire.
Turn the ignition switch to ON (II).
Press and hold the DEF button and FAN ON/OFF button.
Is the DEF button LED blinking?

YES - Audio unit is faulty, replace the audio unit (see AUDIO UNIT REMOVAL/INSTALLATION ). ■

NO - Climate control unit is faulty, replace the climate control unit (see CLIMATE CONTROL UNIT REMOVAL/INSTALLATION ). ■

Fig 3: Connecting Audio Unit Connector D (20P) Terminals No. 6 & No. 7 With Jumper Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.