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Home >> Saab >> 2010 >> 9-5 >> Repair and Diagnosis (Single Page) >> Electrical >> Horns >> Lighting And Signaling Systems >> Fault diagnosis, fault codes >> DTC B257B: Lighting Control Switch Signal >> Circuit/System Verification

Circuit/System Verification

Ignition ON, switch ON exterior lighting, vary the interior backlight from dim to full bright by using the dimmer switch. The interior backlighting should dim and then become full bright.

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