I'm pretty sure that isn't the case.
US car companies seem to operate under this model, but in the rest of the world the financing income is seen as a useful supplement to income from selling cars.
For example, Tata's increase in profitability last year is attributed to increases sales of Jaguar and Landrover cars[1], not profits from financial services.
[1] http://www.industryweek.com/finance/tata-motors-profit-soars...
