Audio System - Audio power switch will not turn on (No information display and no sound) (Without Touch Screen) (2016 2017 2018)

Audio power switch will not turn on (No information display and no sound) 

NOTE: 

• Check the vehicle battery condition first .
• Check the connectors for poor connections or loose terminals.

1. Problem verification

   -1. Press the engine start/stop button to select the ON mode.

   -2. Press the VOLUME/POWER knob on to see if the audio unit turns on.

   Does the audio system operate properly, and does the audio sound normal?

   YES 

   Intermittent failure, the system is OK at this time.

   NO 

   The failure is duplicated, go to step 2.

2. Fuse check

   -1. Press the engine start/stop button to select the OFF mode.

   -2. Check the following fuses.

   Fuse	No. A29 (10 A)
   Location	Under-hood fuse/relay box

   Fuse	No. B19 (7.5 A)
   Location	Under-dash fuse/relay box

   Are the fuses OK?

   YES 

   Go to step 3.

   NO 

   Replace the fuse(s), and recheck. If the fuse(s) blows again, check for a short in the No. A29 (10 A) fuse (also check the GA+B line) and/or the No. B19 (7.5 A) fuse circuits.

3. Open wire check (+B BACK UP line)

   -1. Disconnect the following connector.

   NOTE:  Eject the disc before disconnecting the audio unit to prevent damaging the CD player's load mechanism.

   Audio unit connector A (24P)

   -2. Measure the voltage between test points 1 and 2.

   Test condition	OFF mode
   	Audio unit connector A (24P): disconnected
   Test circuit	+B BACK UP
   Test point 1	Audio unit connector A (24P) No. 3 (GRN)
   Test point 2	Body ground

   Courtesy of HONDA, U.S.A., INC.

   Is there battery voltage?

   YES 

   The +B BACK UP wire is OK. Go to step 4.

   NO 

   Repair an open in the wire between the No. A29 (10 A) fuse in the under-hood fuse/relay box and the audio unit.

4. Open wire check (ACC line)

   -1. Press the engine start/stop button to select the ON mode.

   -2. Measure the voltage between test points 1 and 2.

   Test condition	ON mode
   	Audio unit connector A (24P): disconnected
   Test circuit	ACC
   Test point 1	Audio unit connector A (24P) No. 24 (PUR)
   Test point 2	Body ground

   Courtesy of HONDA, U.S.A., INC.

   Is there battery voltage?

   YES 

   The ACC wire is OK. Go to step 5.

   NO 

   Repair an open in the wire between the No. B19 (7.5 A) fuse in the under-dash fuse/relay box and the audio unit.

5. Open wire check (GND line)

   -1. Press the engine start/stop button to select the OFF mode.

   -2. Reconnect audio unit connector A (24P).

   -3. Press the engine start/stop button to select the ON mode.

   -4. Measure the voltage between test points 1 and 2.

   Test condition	ON mode
   Test circuit	GND
   Test point 1	Audio unit connector A (24P) No. 1 (BLK)
   Test point 2	Body ground

   Courtesy of HONDA, U.S.A., INC.

   Is there less than 0.2 V?

   YES 

   The GND wire is OK. Go to step 6.

   NO 

   Repair an open or high resistance in the wire between the audio unit and body ground (G504).

6. Audio unit check

   -1. Press the engine start/stop button to select the OFF mode.

   -2. Substitute a known-good audio switch panel .

   -3. Reconnect all the connectors, and recheck.

   Does the symptom go away?

   YES 

   Replace the original audio switch panel.

   NO 

   Replace the audio unit .