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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.