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Home >> Mercury >> 2007 >> Montego Premier, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Cluster System And Panel Illumination >> Diagnostic Tests >> Instrument Cluster and Panel Illumination >> Pinpoint Tests >> Pinpoint Test H: The Keypad Switch Illumination Is Inoperative >> Normal Operation

Normal Operation

The smart junction box (SJB) sends a pulse-width modulated (PWM) voltage to the keypad switch, based on input received from the instrument panel dimmer switch, through circuit 66 (LB). Ground for the keypad switch is provided through circuit 1205 (BK).

Possible Causes

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