Radio remote switch does not work properly

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

Test the radio remote switch (see RADIO REMOTE SWITCH TEST ).
Is the radio remote switch OK?
1. YES - Go to step 2.
2. NO - Replace the radio remote switch.
Check the audio unit operation (volume up, volume down, CH (-), CH (+), MODE).
Is the audio unit operation OK?
1. YES - Go to step 3.
2. NO - Replace the audio unit (see AUDIO UNIT REMOVAL/INSTALLATION ), and recheck.
Remove the audio unit (see AUDIO UNIT REMOVAL/INSTALLATION ).

Measure resistance between the audio unit connector (20P) A3 and A11 terminals as specified in the table shown in AUDIO UNIT CONNECTOR (20P) A3 AND A11 .

Fig 1: Measuring Resistance Between Audio Unit Connector (20P) A3 And A11 Terminals

Courtesy of AMERICAN HONDA MOTOR CO., INC.

AUDIO UNIT CONNECTOR (20P) A3 AND A11

Button held down	VOL DOWN	VOL UP	CH (-)	CH (+)	MODE	(NONE)
Resistance	about 100 ohm	about 370 ohm	about 770 ohm	about 1.7 Kohm	about 3.7 Kohm	10 k ohm

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 the No. 3 and No. 11 terminals of the audio unit connector A (20P) and body ground.

Fig 2: Checking Continuity Between No. 3 & 11 Terminals Audio Unit Connector A (20P) And Body Ground
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 ).