Possible Causes
ATTEMPT TO COMMUNICATE WITH THE RADIO
GROUND CIRCUIT OPEN
FUSED B(+) CIRCUIT OPEN
FUSED ACCESSORY RELAY OUTPUT CIRCUIT OPEN
OPEN PCI BUS CIRCUIT
AMPLIFIER
ATTEMPT TO COMMUNICATE WITH THE RADIO
GROUND CIRCUIT OPEN
FUSED B(+) CIRCUIT OPEN
FUSED ACCESSORY RELAY OUTPUT CIRCUIT OPEN
OPEN PCI BUS CIRCUIT
AMPLIFIER