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1. Turn the ignition switch to LOCK (0).
2. Disconnect climate control unit connector B (20P) and audio unit connector D (20P).
3. 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. 11

   No. 8: No. 12

   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.
4. 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.
5. Reconnect climate control unit connector B (20P).
6. Connect audio unit connector D (20P) terminals No. 11 and No. 12 with a jumper wire.
   Fig 3: Connecting Audio Unit Connector D (20P) Terminals No. 11 & No. 12 With Jumper Wire

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
7. Turn the ignition switch to ON (II).
8. 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. ■