Radio Remote Switch Does Not Work Properly

WARNING: This page is about a different car, the 2006 Acura MDX, 2005 Acura MDX, 2004 Acura MDX, and 2003 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.

Test the radio remote switch.
- '03-04 models (see RADIO REMOTE SWITCH TEST/REPLACEMENT )
- '05-06 models (see RADIO REMOTE SWITCH TEST/REPLACEMENT )
Is the radio remote switch OK?
1. YES - Go to step 2.
2. NO - Replace the radio remote switch.
Remove the audio unit (see AUDIO UNIT REMOVAL/INSTALLATION ).
Disconnect the audio unit connector A (20P).

Measure resistance between the audio unit connector A (20P) No. 3 and No. 11 terminals as specified in the check list.

Fig 1: Measuring Resistance Between Audio Unit Connector A (20P) Terminals 3 And 11

Courtesy of AMERICAN HONDA MOTOR CO., INC.

CHECK LIST

Button held down	VOL DOWN	VOL UP	CH	MODE	(NONE)
Resistance	about 47 ohm;	about 317 ohm;	about 1 kohm;	about 3.2 kohm;	10 kohm;

Is resistance OK?

YES - Go to step 5.
NO - Repair open or high resistance in the circuit between the audio unit and the radio remote switch. If the wires are OK, replace the cable reel (see CABLE REEL REPLACEMENT ).

Check for continuity between body ground and audio unit connector (20P) A3 and A11 terminals individually.

Fig 2: Checking Continuity Between Body Ground And Audio Unit Connector And Terminals A3 And A11
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?
1. YES - Repair the short to body ground in the circuit between the audio unit and the radio remote switch. If the wires are OK, replace the cable reel (see CABLE REEL REPLACEMENT ).
2. NO - Replace the audio unit (see AUDIO UNIT REMOVAL/INSTALLATION )