Test I: Loud Popping Sound When Cycling The Ignition Switch - CDX6 And Navigation Audio Unit Only

PINPOINT TEST I: LOUD POPPING SOUND WHEN CYCLING THE IGNITION SWITCH - CDX6 AND NAVIGATION AUDIO UNIT ONLY

I1:

I1-I3:

I3-I5:

I5-I6:

Normal Operation
Voltage is sent to the audio unit for the start input through circuit 50-MD15 (GY/OG) when the key is placed in the START position. The audio unit then immediately mutes all speaker amplifier outputs and the subwoofer amplifier enable circuit to eliminate the possibility of speaker pops during engine cranking.

Possible Causes
- Fuse
- Circuit 7-MD12 (YE) short to voltage
- Circuit 7-MD19 (YE/RD) short to voltage
- Circuit 50-MD15 (GY/OG) open
- Audio unit
- Subwoofer amplifier
- Center imaging amplifier