Conditions for Setting the DTC

B1025 01, B1035 01, B1045 01, B1055 01 

The radio detects a short to voltage on the specified audio (+) or (-) circuit.

B1025 02, B1035 02, B1045 02, B1055 02 

The radio detects a short to ground on the specified audio (+) or (-) circuit.

B1025 04, B1035 04, B1045 04, B1055 04 

The radio detects an open on the specified audio (+) or (-) circuit.