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Home >> Cadillac >> 2018 >> Escalade ESV Platinum, RWD >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Lighting System - DTC B0655 To DTC B3951 >> Diagnostic Information And Procedures >> DTC B2625: Display Dimming Pulse Width Modulation Output Circuit >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connectors at the components listed below.
    NOTE:

    Each component with backlighting may need to be disconnected to isolate a short to voltage or short to ground. Use the schematics to identify the following:

    • Backlighting components the vehicle is equipped with
    • Each component's control and ground circuit terminals
    • Component locations on the backlighting control circuit
    • S13D Door Lock Switch - Driver (Z75)
    • S13P Door Lock Switch - Passenger (Z75)
    • S48A Multifunction Switch - Instrument Panel (X88/Z88)
    • S48D Multifunction Switch 2 - Instrument Panel (Z75)
    • S48C Multifunction Switch 1 - Instrument Panel (Z75)
    • S77 Transfer Case Shift Control Switch (NPO/NQH)
    • S79D Window Switch - Driver
    • S140 Media Disk Eject Switch (Z75)
    • S145 Center Console Compartment Cooler Switch (DCK)
  2. Ignition ON, place the dimmer switch in the HIGH position for high backlighting intensity.
  3. Verify a test lamp illuminates between each control circuit terminal listed below and ground.
    NOTE: The test lamp in the following step will illuminate at LOW intensity. This is normal circuit operation and does not indicate a circuit malfunction.
    • S13D Door Lock Switch - Driver terminal 5 (Z75)
    • S13P Door Lock Switch - Passenger terminal 5 (Z75)
    • S48A Multifunction Switch - Instrument Panel terminal 5 (X88/Z88)
    • S48D Multifunction Switch 2 - Instrument Panel terminal 3 (Z75)
    • S48C Multifunction Switch 1 - Instrument Panel terminal 3 (Z75)
    • S77 Transfer Case Shift Control Switch terminal 4 (NPO/NQH)
    • S79D Window Switch - Driver terminal 11
    • S140 Media Disk Eject Switch terminal 3 (Z75)
    • S145 Center Console Compartment Cooler Switch terminal 6 (DCK)
    • If the test lamp does not illuminate 
    1. Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K9 Body Control Module.
    • Go to next step: If the test lamp illuminates 
  4. Place the dimmer switch in the LOW position for low backlighting intensity.
  5. Verify a test lamp does not illuminate at FULL intensity between each control circuit terminal listed below and ground.
    • S13D Door Lock Switch - Driver terminal 5 (Z75)
    • S13P Door Lock Switch - Passenger terminal 5 (Z75)
    • S48A Multifunction Switch - Instrument Panel terminal 5 (X88/Z88)
    • S48D Multifunction Switch 2 - Instrument Panel terminal 3 (Z75)
    • S48C Multifunction Switch 1 - Instrument Panel terminal 3 (Z75)
    • S77 Transfer Case Shift Control Switch terminal 4 (NPO/NQH)
    • S79D Window Switch - Driver terminal 11
    • S140 Media Disk Eject Switch terminal 3 (Z75)
    • S145 Center Console Compartment Cooler Switch terminal 6 (DCK)
    • If the test lamp illuminates at full intensity 
    1. Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module, ignition ON.
    2. Test for less than 1 V between the control circuit terminal and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K9 Body Control Module.
    • Go to next step: If the test lamp does not illuminate at full intensity 
  6. Test or replace the inoperative component.
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