Audio

System Description

BASE SYSTEM
Refer to Owner's Manual for audio system operating instructions.

Power is supplied at all times
- through 15 A fuse [No. 37, located in the fuse and fusible link box]
- to audio unit terminal6.

With the ignition switch in the ACC or ON position, power is supplied
- through 10 A fuse [No. 6, located in the fuse block (J/B)]
- to audio unit terminal 10.

Ground is supplied through the case of the audio unit.
Audio unit and A/C and audio controller are connected by FPC (Flexible Print Circuit). A/C and audio controller integrates A/C switches and audio switches.

When A/C and audio controller is pushed to audio switch, it sends audio signal to audio unit. Then audio signals are supplied
- through audio unit terminals 1, 2, 3, 4, 13, 14, 15, and 16
- to terminals 1 and 2 of front door speaker LH and RH
- to terminals 1 and 2 of rear door speaker LH and RH
- to terminals 1 and 2 of tweeter LH and RH.

When one of steering wheel audio control switches is pushed to volume up, seek up, or power ON, resistance in steering switch circuit changes depending on which button is pushed. This will change voltage. Power is supplied
- from audio unit terminal 23
- through combination switch (spiral cable) terminal 26 and 16
- to steering wheel audio control switch.

Ground is supplied
- from steering wheel audio control switch
- through combination switch (spiral cable) terminal 17 and 31
- from audio unit terminal 25.

When one of steering wheel audio control switches is pushed to volume down, seek down, or mode ON, resistance in steering switch circuit changes depending on which button is pushed. This will change voltage.

Power is supplied
- from audio unit terminal 22
- through combination switch (spiral cable) terminal 34 and 20
- to steering wheel audio control switch.

Ground is supplied
- from steering wheel audio control switch
- through combination switch (spiral cable) terminal 17 and 31
- from audio unit terminal 25.

BOSE SYSTEM
Refer to Owner's Manual for audio system operating instructions.

Power is supplied at all times
- through 15 A fuse [No. 37, located in the fuse and fusible link box]
- to audio unit terminal 6, and
- to Bose speaker amp. terminal 11.
- through 15 A fuse [No. 17, located in the fuse block (J/B)]
- to woofer terminal 6.

With the ignition switch in the ACC or ON position, power is supplied
- through 10 A fuse [No. 6, located in the fuse block (J/B)]
- to audio unit terminal 10.

Ground is supplied through the case of the audio unit.

Ground is also supplied
- to Bose speaker amp. terminal 24, and
- to woofer terminal 5
- through body ground B5 and B29.
Audio unit and A/C and audio controller are connected by FPC (Flexible Print Circuit).

A/C and audio controller integrates A/C switches and audio switches.

When A/C and audio controller is pushed to audio switch, it send audio signal to audio unit.

Then audio signals are supplied
- through audio unit terminals 1, 2, 3, 4, 13, 14, 15, and 16
- to Bose speaker amp. terminals 4, 5, 6, 7, 17, 18, 19, and 20.

Audio signals are amplified by the Bose speaker amp.

The amplified audio signals are supplied
- through Bose speaker amp. terminals 1, 2, 8, 12, 13, 14, 15, 21, 25, and 26
- to terminals 1 and 2 of front door speaker LH and RH
- to terminals 1 and 2 of rear door speaker LH and RH
- to terminals 1 and 2 of tweeter LH and RH.
- to terminals 1 and 2 of woofer.

When one of steering wheel audio control switches is pushed to volume up, seek up, or power ON, resistance in steering switch circuit changes depending on which button is pushed. This will change voltage.

Power is supplied
- from audio unit terminal 22
- through combination switch (spiral cable) terminal 34 and 20
- to steering wheel audio control switch.

Ground is supplied
- from steering wheel audio control switch
- through combination switch (spiral cable) terminal 17 and 31
- to audio unit terminal 25.

When one of steering wheel audio control switches is pushed to volume down, seek down, or mode ON, resistance in steering switch circuit changes depending on which button is pushed. This will change voltage.

Power is supplied
- from audio unit terminal 22
- through combination switch (spiral cable) terminal 34 and 20
- to steering wheel audio control switch.

Ground is supplied
- from steering wheel audio control switch
- through combination switch (spiral cable) terminal 17 and 31
- to audio unit terminal 25.