The Video Entertainment System (VES) controls the operation of the rear speakers. The Auxiliary Video Module (AVM) has an audio amplifier, which is used to sound video audio through the rear speakers. The Interface Module (IM) senses when the radio is in use through circuit 145. When the radio is off, the IM allows the rear speakers to sound video audio. However, when the radio is turned on, the IM mutes the rear speakers; video audio is then available through the headphone jacks at the Second and Third Seat Audio (SSA/TSA) controls only. This action prevents two sources of audio to be heard at the same time (radio audio through the front speakers and video audio through the rear speakers.)

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 (SSA/TSA) controls, muting the rear speakers.

The Rear Seat Audio (RSA) control provides second row passengers access to the radio audio system. The RSA, when turned on, allows the user to listen to the radio, audio cassette, or compact disc (if equipped) through headphones. When the RSA is turned on, the RSA automatically mutes the rear speakers. The controls on the radio allow the driver and front passenger to adjust radio audio coming through the front speakers. At the same time, the second (and third row) passengers can listen to the audio cassette or CD while the front passengers are listening to the radio, and vice versa. The RSA provides volume controls, mode selection (radio/tape/cd), seek, among other features. The audio selected at the RSA controls is also routed to the SSA/TSA controls. The RSA headphone jacks do not provide access to the video audio channel; it is only available at the SSA/TSA controls.

The number(s) below refer to the step number(s) on the diagnostic table.

1. Checks for radio audio output coming from the radio and bussed through the IM.

3. Determines whether the fault is due to an open in the audio output channel(s) between the IM and the speaker, or the speaker is faulty.

6. Verifies repairs made to the VES.