Test E: Loud Popping Sound When Cycling The Ignition Switch

PINPOINT TEST E: LOUD POPPING SOUND WHEN CYCLING THE IGNITION SWITCH

E1-E3:

Normal Operation
Voltage is supplied to the audio unit through circuit 1000 (RD/BK) when the ignition switch is turned to the START position. When the audio unit receives this voltage, it mutes all speaker outputs and subwoofer amplifier enable circuits to eliminate the possibility of speaker pops during engine cranking.

Possible Causes
- Fuse
- Circuit 1000 (RD/BK) open
- Circuit 173 (DG/VT) short to voltage
- Circuit 174 (GY/BK) short to voltage
- Subwoofer amplifier
- Audio unit