MKX AWD V6-3.5L (2007)
P5-P6
Normal Operation
The smart junction box (SJB) monitors the parking lamp request input from the headlamp switch through circuit CLS34 (GY). The SJB provides a
ground for the parking lamp relay coil (integrated into the SJB) when a request for the parking lamps is received. When the parking lamp relay is
energized, voltage is routed through circuit CLS30 (VT/WH) to the rear and front parking lamps.
DTC B1578 Lamp Park Input Circuit Short to Ground - is an on-demand DTC that sets when the SJB detects a short to ground in the parking lamps
on input circuit.
This pinpoint test is intended to diagnose the following:
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Wiring, terminals or connectors
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Headlamp switch
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SJB