Sound signals (VAZ-2101)

Two sound signals are installed on cars; one (C305) high with a pipe (C304) low tone. The sound signals are located in the engine compartment and are attached to a bracket attached to the left radiator shield.

Signals C304 and C305 are electromagnetic, noise type, creating sound of a fairly wide frequency range. The basic frequency of the low tone signal is 405-445 Hz, and the high tone is 470-495 Hz. The high and low tone signals differ only in the thickness of the membrane: the C304 signal has a thicker one than the C305. The current consumed by each signal is 4A. Therefore, they are switched on without auxiliary relays directly by the switch located on the steering wheel.

The reasons for malfunctions of sound signals may be the following:; the switch does not work or is stuck, or the sound signal itself is faulty. To detect the fault, check the reliability of the wire connection, the condition of the switch contacts. If necessary, clean the contacts. Replace the faulty switch or sound signal with a new one.

If the volume of the signal decreases or wheezing appears, adjust the signal. To do this, turn off the second signal and turn the adjustment screw on the signal body in one direction or another to achieve a loud and clear sound. If the adjustment does not eliminate the wheezing or if the signal works intermittently, then disassemble it and clean the contacts of the interrupter inside the signal. When assembling the signal, it is necessary to install the previous gasket between the membrane and its body so as not to disturb the gap (0.4±0.05) mm between the core and the anchor.

(The text is on the website VazBook)