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Normal Operation

WARNING: This page is about a different car, the 2010 Mercury Mariner and 2010 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

The Smart Junction Box (SJB) sends voltage signals to the headlamp switch to monitor the OFF, PARKING LAMPS ON and HEADLAMPS ON positions. At any given time, the headlamp switch routes one of the input circuits to ground.

When the SJB  detects the headlamp switch in the HEADLAMPS ON position with the multifunction switch in the LOW BEAM position, the SJB  provides voltage to the LH and RH low beam headlamps.

DTC DESCRIPTION CHART

DTC Description Fault Trigger Conditions
  • B1472 - Lamp Headlamp Input Circuit Short to Ground
 An on-demand DTC that sets when the SJB  detects a short to ground from the headlamps on input circuit.
  • B2498 - Headlamp Switch Multiple Signals Input Active
 A continuous DTC that may set when the SJB  detects multiple headlamp switch inputs active at the same time.
  • B2A22 - Headlamp Off Circuit Open
 An on-demand DTC that sets when the SJB  detects an open from the headlamp switch off input circuit.
  • B2A2E - Right Front Lamp Low Beam Circuit Open
 An on-demand DTC that sets when the SJB  detects a short to voltage from the RH low beam output circuit.
  • B2A30 - Left Front Lamp Low Beam Circuit Open
 An on-demand DTC that sets when the SJB  detects a short to voltage from the LH low beam output circuit.

This pinpoint test is intended to diagnose the following: 

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