Rear Speaker Radio Audio INOP W/VES and RSA Off

Diagnostic Chart:

Schematic:

CIRCUIT DESCRIPTION
The radio outputs its rear speaker audio channels directly to the Rear Seat Audio (RSA) control. When the RSA is turned on, the RSA routes these audio channels to the headphone jacks, thus muting the rear speakers. When the RSA is turned off, the RSA routes the radio audio channels to the Interface Module (IM). When the Video Entertainment System (VES) is off, the IM routes the radio audio channels to the rear speakers. If the VES is on, then the IM routes radio audio channels to the second and third seat audio controls, and mutes the rear speakers.

DIAGNOSTIC AIDS
An intermittent failure may be very difficult to detect and to diagnose accurately. Faulty electrical connections or wiring causes most intermittent problems. When an intermittent condition is suspected, check the suspected circuits for the following conditions:
^ Poor mating of connector halves or backed out terminals.
^ Improperly formed or damaged terminals.
^ Wire chafing.
^ Poor wire to terminal connections.
^ Dirty or corroded terminals.
^ Damage to connector bodies.
^ Wire broken inside the insulation.

TEST DESCRIPTION
The number(s) below refer to the step number(s) on the diagnostic table.
8. Verifies repairs made to the VES.