Audio remote switch does not work properly (with navigation)

NOTE:

Check the vehicle battery condition first (see 12 VOLT BATTERY TEST ).
Check the connectors for poor connections or loose terminals.

Turn the ignition switch to ON (II).
Turn on the audio-navigation unit, and check the audio remote switch operation (volume up, volume down, CH +, CH -, MODE).
Is the audio-navigation unit operation OK?

YES -Intermittent failure, the audio remote switch is OK at this time. Check for loose connections.

NO -Go to step 3.
Go to the audio button, knob, and audio remote switch detection mode in the Self-Diagnostic Function (see HFL ).
Are the audio remote switch functions detected and functioning properly?

YES -Substitute a known-good audio-navigation unit (see AUDIO-NAVIGATION UNIT REMOVAL/INSTALLATION ), and recheck. If the symptom/indication goes away, replace the original audio-navigation unit (see AUDIO-NAVIGATION UNIT REMOVAL/INSTALLATION ).

NO -Go to step 4.
Turn the ignition switch to LOCK (0).
Do the AUDIO REMOTE SWITCH TEST .
Is the audio remote switch OK?

YES -Go to step 6.

NO -Replace the audio remote switch (see AUDIO REMOTE SWITCH REPLACEMENT ), and recheck.
Remove the audio-navigation unit (see AUDIO-NAVIGATION UNIT REMOVAL/INSTALLATION ).
NOTE:
- Eject all the discs before removing the audio-navigation unit to prevent damaging the CD player's load mechanism.
- Remove the PC card before removing the audio-navigation unit.
Disconnect audio-navigation unit connector A (24P).

Reconnect the audio remote switch, and measure the resistance between audio-navigation unit connector A (24P) terminals No. 11 and No. 22 as specified in the table.

Fig 1: Measuring Resistance Between Audio-Navigation Unit Connector A (24P) Terminals No. 11 And No. 22

Courtesy of AMERICAN HONDA MOTOR CO., INC.

AUDIO REMOTE SWITCH REFERENCE CHART

Position	VOL DOWN	VOL UP	CH (-)	CH (+)	MODE	No button pressed
Resistance	about 100 Ω	about 357 Ω	about 775 Ω	about 1.7 kΩ	about 3.7 kΩ	about 10 kΩ

Is the resistance OK?

YES -Go to step 9.

NO -Repair a short or open or high resistance in the circuit between the audio-navigation unit and the audio remote switch. If the wires are OK, replace the cable reel (see CABLE REEL REPLACEMENT ).

Check for continuity between body ground and audio-navigation unit connector A (24P) terminals No. 11 and No. 12 individually.

Fig 2: Checking Continuity Between Body Ground And Audio-Navigation Unit Connector A (24P) Terminals No. 11 And 12
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Repair a short to body ground in the circuit between the audio-navigation unit and the audio remote switch. If the wires are OK, replace the cable reel (see CABLE REEL REPLACEMENT ).

NO -Substitute a known-good audio-navigation unit (see AUDIO-NAVIGATION UNIT REMOVAL/INSTALLATION ), and recheck. If the symptom/indication goes away, replace the original audio-navigation unit (see AUDIO-NAVIGATION UNIT REMOVAL/INSTALLATION ).