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Section 3 Audio System Inspection

I Troubleshooting

Symptom

Suspected Area

1.  Radio assembly circuit faulty

2.  Radio assembly

1.  Radio assembly backlight terminal

2.  Radio assembly

1.  Speaker circuit

2.  Radio assembly power circuit faulty

3.  Radio assembly

1.  Speaker circuit

2.  Radio assembly power circuit faulty

3.  Radio assembly

1.  Antenna circuit

2.  Radio assembly

1.  Tape

2.  Radio assembly power circuit faulty

3.  Radio assembly

1.  Tape

2.  Radio assembly

1.  Tape

2.  Radio assembly

1.  Tape

2.  Radio assembly

1.  Wire between CD box and  main unit 

2.  CD Player main unit power supply circuit fault

3.  CD box

4.  CD Player main unit

1.  Wire between CD box and main unit

2.  CD box

3.  CD

4.  CD Player main unit 

1.  Wire between CD box and main unit

2.  CD box

3.  CD

4.  CD PLAYER main uni t

1.  Wire between CD box and main unit

2.  CD box

1.  CD box

2.  CD box installation

Sound quality poor only when playing CD

(Volume faint)

CD sound jump

Tape jammed, malfunction with tape

speed or auto-reverse

CD could not be inserted or ejected after

inserted.

Power coming in, but CD player not

operating.

CD can not be taken out

Unable to receive radio broadcast (poor

reception)

The cassette could not be inserted or

played

Cassette tape will not be ejected

Sound quality poor only when playing

cassette tape

Radio not operating when power switch

turned to “ON”.

The radio backlight does not light up with

the illumination switch ON

Speaker soundless in all modes

Sound quality poor in all modes (Volume

faint)

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II. Inspection

1. Power switch system doesn't work

Wiring Diagram

(1) Check radio assembly (+B, ¬ACC, ¬GND)

1

Check the continuity between terminals under each operating condition as shown in the table below

Standard:

2

Check the voltage between terminals under each operating condition as shown in the table

Standard:

Normal:

Repair or replace wire harness, connector

Abnormal: Check or replace radio assembly

Main Fuse Box

Radio and CD

Battery

Fusible Link Box

Ignition Switch

Tester connection

Condition

Standard Status

GND

Constant Status

Continuity

Tester Connection

Condition

Standard Status

+B - GND

Constant Status

10～14V

ACC - GND

Ignition switch ACC or ON

10～14V

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2. The radio backlight does not light up with the illumination switch ON

Wiring Diagram

(1) Check radio assembly (TAIL)

Check the voltage between terminals under each operating condition as shown in the table below.

Standard:

Abnormal:

Repair or replace wire harness and connector

Normal: Check and replace radio assembly

Main Fuse Box

Radio and CD

Fusible Link Box

Battery

Light 

Control 

Switch

Battery

Tester Connection

Condition

Standard Status

TAIL - GND

Combined Switch (Light switch)

10～14V

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3. Speaker soundless in all modes

Wiring Diagram

(1) Check LCD (Liquid Crystal Display) illumination

1

Turn ignition switch to  ACC

2

Connect radio assembly continuity

3

Switch on position lamp

Standard: Radio assembly LCD light goes on

Abnormal:Go to Step (7)

Normal:Go to  Next Step

(2)  Control volume and adjust volume balance

Operate the radio assembly to adjust volume balance and find soundless speaker

Check and replace the radio assembly if all the speakers are soundless

Check and replace the soundless speakers if some of the speakers are soundless

Main Fuse Box

Radio and CD

Ignition switch

Fusible Link Box

Battery

Left Rear Speaker

Right Rear Speaker

Left tweeter Speaker

Right tweeter Speaker

Left Front Speaker

Right Front Speaker