Page 417 - Workshop Manual - Aumark (BJ1051)

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Diagnosis-audio system

Speaker tone quality is poor in all modes

Diagnostic Procedure

1. Checking audio unit settings
(a) Ignition switch: ON.
(b) Depress power switch of audio unit.
(c) Turn up audio unit to above 5 VOL.
(d) Set “BAS” (bass), “TRE” (treble), and “BAL” (balance) to their respective initial settings;
or set “BAS” and “TRE” to 0~3 and “BAL” to 0.
(e) Press “VOL” (volume control key) and hold for more than 2 seconds to enable loudness
function.
Check speakers for normal tone quality. 4
Yes > CD or MP3 audio unit settings are incorrect.
No > Go to step 2.
2. Checking speakers
(a) Ignition switch: OFF.
(b) Remove left and right speakers. (Refer to “Chapter 56 Audio System-Speaker,
Replacement”.)
(c) Check left and right speakers for foreign material absorption.
(d) Check left and right speaker cones for excessive dust accumulation inside.
(e) Check left and right speaker cones for breakage.
Resistance: 8Ω
(f) Use a multimeter to measure resistances
between connector pins 1 and 2 of left
and right speakers E002 and D002
respectively.

Are check results normal?
Yes > Go to step 3.
No > Clear foreign materials or dust, or replace speakers.

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