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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 B2545: Backup Lamps Circuit >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module, ignition ON.
  2. Verify a test lamp illuminates between the B+ circuit terminal 3 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF, disconnect the X2 harness connector at the X51L Fuse Block - Instrument Panel Left.
    2. Test for less than 2 Ω in the B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF, disconnect the X2 harness connector at the X51L Fuse Block - Instrument Panel Left.
    2. Test for infinite resistance between the B+ circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K9 Body Control Module.
    • Go to next step: If the test lamp illuminates 
  3. Ignition OFF, connect the X2 harness connector at the K9 Body Control Module.
  4. Ignition OFF, all vehicle systems OFF, disconnect the X2 Harness connector at the X50A Fuse Block - Underhood. It may take up to 2 min for all vehicle systems to power down.
  5. Test for less than 10 Ω between the ground circuit terminal F2 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 Ω 
  6. Ignition OFF, disconnect the X5 harness connector at the K9 Body Control Module.
  7. Connect a 3 A fused jumper between the control circuit terminal 26 and B+, ignition ON.
  8. Verify a test lamp illuminates between the F34UA Fuse test point and ground.
    • If the test lamp does not illuminate 
    1. Ignition OFF, remove the fused jumper wire
    2. Disconnect the X4 harness connector at the X50A Fuse Block - Underhood.
    3. 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.
    4. 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 X50A Fuse Block - Underhood.
    • Go to next step: If the test lamp illuminates 
  9. Ignition OFF, remove the fused jumper wire
  10. Ignition ON, verify the test lamp does not illuminate between the F34UA and ground
    • If the test lamp illuminates 
    1. Ignition OFF, disconnect the X4 harness connector at the X50A Fuse Block - Underhood.
    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 X50A Fuse Block - Underhood.
    • Go to next step: If the test lamp does not illuminate 
  11. Replace the K9 Body Control Module
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