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The speed of a DC wiper motor is not controlled by the frequency of pulses. The speed is controlled by PWM which is completely different.
PWM adjusts the duty cycle of the pulses, not their frequency.
It could be an intermittent wiper speed control. Meaning it operates at a very low frequency (say, 1 pulse every 30 seconds minimum to 1 pulse every 2-3 seconds maximum). Each pulse triggers a single wipe cycle.
Looking at the R and C values at the 2nd 555 and doing some math, or running the circuit in LTSpice should give an idea of what frequencies are output at each of the decade counter's levels.
It could be an intermittent wiper speed control. Meaning it operates at a very low frequency (say, 1 pulse every 30 seconds minimum to 1 pulse every 2-3 seconds maximum). Each pulse triggers a single wipe cycle.
Looking at the R and C values at the 2nd 555 and doing some math, or running the circuit in LTSpice should give an idea of what frequencies are output at each of the decade counter's levels.