Please refer to https://www.exchange-rates.org/history/PKR/USD/G/180 , the chart is self explanatory.
No doubt, our currency has devalued but the increase in car prices by Suzuki is not matching trend (as per my limited knowledge).
USD jumped from 105.9 - 111 PKR during 10-22 December, 2017 and it remained around 110-111 PKR for up to 20-03-2018, however, during this period, Pak Suzuki increased car prices for 02 times; first by January 2018 and then by March, 2018. By January, 2018 may seem justified, however, second increase in prices in March, 2018 seems unjustified as PKR did not devalue further during this period.
Similarly, USD jumped from 110.6 - 115.6 PKR during 20-22 March, 2018 and it's still around 115.6 - 116 PKR as of today. During past 2.5 months, it did not devalue further, however, prices have been increased for the 3rd time during this year, in June 2018.