IV. Audio system component check
Fig. 4-108
1. Press down power switch, can not start audio system:
According to the circuit diagram Fig. 4-108, check the environment of CAB, for possible ①
features causing electrical short-circuit, and keep CAB dry and ventilative; ② Test the voltage
between audio system assembly connector terminal A7 and vehicle body, the voltage shall be
10-14V. ③ Test the resistance between audio system assembly connector terminal A8 and
vehicle body, the resistance shall be less than 1Ω. ④ Turn ignition switch to ACC, and test the
voltage between audio system assembly connector terminal A4 and vehicle body, the voltage shall
be 10~14V. If all above is normal, check and replace audio system assembly; if not, repair or
replace wiring and connector.
2. Audio system night illumination system can not work:
Turn the light control gears of light combination switch assembly to lamplet or fog light, test voltage
between audio system assembly connector terminal A5 and vehicle body according to the circuit
diagram Fig. 4-108, the voltage shall be 10~14V. If the voltage is normal, check and replace CD
player assembly; if not, repair and replace wiring and connector.
3. No speaker voice in all modes:
Check according to the circuit diagram Fig. 4-108, detailed steps as follows:
(1) Check display device
Turn ignition switch to ACC, make audio system in ON position, the display device is lightened. If
all above is normal, proceed to next step; if not, proceed to 5th step.
(2) Adjust volume controller and adjust sound balance
Operate audio system volume control knob and adjust sound balance to identify which speaker is
silent. If one specific speaker is silent, proceed to next step; if all the speakers are silent, check
and replace audio system.
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