Audio remote switch does not work properly (without navigation)

WARNING: This page is about a different car, the 2011 Acura TL, 2010 Acura TL, and 2009 Acura TL. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

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

Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
Turn on the audio unit, and check the audio remote switch operation (volume up, volume down, CH (UP), CH (DOWN), MODE)
Is the audio system operation OK?

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

NO -Go to step 3
Test the audio remote switch (see Audio Remote Switch Test )
Is the audio remote switch OK?

YES -Go to step 4

NO -Replace the audio remote-HFL switch (see STEERING WHEEL DISASSEMBLY/REASSEMBLY )
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
Remove the audio unit (see AUDIO UNIT REMOVAL/INSTALLATION )
Disconnect audio unit connector A (24P)
NOTE: Eject all the CDs before disconnecting audio unit to prevent damaging the CD player's load mechanism

Reconnect the audio remote switch, and measure the resistance between audio unit connector A (24P) terminals No 5 and No 16 as specified in the table

Fig 1: Measuring Resistance Between Audio Unit Connector A (24P) Terminals No 5 And No 16

Courtesy of AMERICAN HONDA MOTOR CO., INC.

AUDIO REMOTE SWITCH TABLE

AUDIO REMOTE SWITCH REFERENCE CHART

Button held down	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 8

NO -Repair short or high resistance in the circuit between the audio unit and the audio remote switch If the wires are OK, replace the cable reel (see DISPOSAL OF DAMAGED COMPONENTS )

Disconnect the audio remote-HFL switch 12P connector
Check for continuity between body ground and terminals No 5 and No 16 of audio unit connector A (24P) individually

Fig 2: Checking Continuity Between Body Ground And Terminals No 5 And No 16 Of Audio Unit Connector A (24P)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

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

NO -Replace the audio unit (see AUDIO UNIT REMOVAL/INSTALLATION )