Test G: Loud Popping Sound When Cycling The Ignition

PINPOINT TEST G: LOUD POPPING SOUND WHEN CYCLING THE IGNITION

G1:

G2-G4:

Normal Operation
Voltage is sent through the start input circuit CBP13 (GY/BN) to the audio unit with the key in START. Upon receiving this signal, the audio unit mutes all speaker outputs to eliminate the possibility of speaker pops during engine cranking.

Possible Causes
- Fuse
- Circuit CBP13 (GY/BN) open
- Subwoofer amplifier (Audiophile)
- Audio amplifier (THX(R))
- Audio unit