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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 >> Inspection and Verification

Inspection and Verification

  1. Verify the customer concern.
  2. Visually inspect the following for obvious signs of electrical damage.
    VISUAL INSPECTION CHART

    Electrical
    • Smart junction box (SJB) fuse 15 (10A)
    • Bulb(s)
    • Circuitry
    • Manual temperature control
    • Steering wheel controls
    • PRNDL display
    • Adjustable pedal switch (if equipped)
    • Center stack switches (includes the hazard, traction control [if equipped], and parking aid disable switches [if equipped])
    • Analog clock (if equipped)
    • Decklid release switch (if equipped)
    • Auxiliary climate control switches (if equipped)
    • Door lock control switches
    • Window control switches
    • Headlamp switch
    • Electronic automatic temperature control (EATC) module and switches
    • Audio unit
    • SJB
    • Instrument cluster
  3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
    4. NOTE: Make sure to use the latest scan tool software release.
  4. If the cause is not visually evident, connect the scan tool to the data link connector (DLC).
    5. NOTE: The vehicle communication module (VCM) LED prove-out confirms power and ground from the DLC are provided to the VCM.
  5. If the scan tool does not communicate with the VCM:
    • Check the VCM connection to the vehicle.
    • Check the scan tool connection to the VCM.
    • Refer to MODULE COMMUNICATIONS NETWORK article, No Power To The Scan Tool, to diagnose no communication with the scan tool.
  6. If the scan tool does not communicate with the vehicle:
    • Verify the ignition key is in the ON position.
    • Verify the scan tool operation with a known good vehicle.
    • Refer to MODULE COMMUNICATIONS NETWORK article to diagnose no response from the powertrain control module (PCM).
  7. Carry out the network test:
    • If the scan tool responds with no communication for one or more modules, refer to MODULE COMMUNICATIONS NETWORK article.
    • If the network test passes, retrieve and record the continuous memory DTCs.
  8. Clear the continuous DTCs and carry out the self-test diagnostics for the SJB.
  9. If the DTCs retrieved are related to the concern, go to the Smart Junction Box (SJB) Diagnostic Trouble Code (DTC) Index. For all other DTCs, refer to MULTIFUNCTION ELECTRONIC MODULES article.
  10. If no DTCs related to the concern are retrieved, go to Symptom Chart .
SMART JUNCTION BOX (SJB) DIAGNOSTIC TROUBLE CODE (DTC) INDEX

DTC Description Action
B1247 Panel Dim Switch Circuit Open Go to Pinpoint Test F .
B2026 Incandescent Backlighting Output Circuit Failure Go to Pinpoint Test D .
B2027 LED Backlighting Output Circuit Failure Go to Pinpoint Test D .
All other DTCs - REFER to MULTIFUNCTION ELECTRONIC MODULES article.
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