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Home >> Chevrolet >> 2011 >> Volt >> Repair and Diagnosis >> External Pages >> Different car >> Section 14 (Lighting System) >> Diagnostic Information and Procedures >> DTC B2545 >> Circuit/System Testing
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Circuit/System Testing

WARNING: This page is about a different car, the 2012 Chevrolet Volt. However, it is still accessible from the selected car via links, so may be relevant.
  1. Vehicle OFF, disconnect the X5 harness connector at the K9 body control module, vehicle in Service Mode.
  2. Verify a test lamp illuminates between the B+ circuit terminal 4 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Vehicle OFF.
    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. Vehicle OFF.
    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.
    • If the test lamp illuminates 
  3. Vehicle OFF, connect the X5 harness connector at the K9 body control module.
  4. Vehicle OFF, exterior lamps OFF, disconnect the harness connector at the E5 backup lamp.
  5. Test for less than 5 Ω between the ground circuit terminal and ground.
    • If 5 Ω or greater 
    1. Vehicle 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.
    • If less than 5 Ω 
  6. Connect a test lamp between the control circuit terminal and ground, vehicle in Service Mode.
  7. Verify the test lamp turns ON and OFF when commanding the Backup Lamps ON and OFF with a scan tool.
    • If the test lamp is always OFF 
    1. Vehicle OFF, disconnect the X7 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.
    • If the test lamp is always ON 
    1. Vehicle OFF, disconnect the X7 harness connector at the K9 body control module, vehicle in Service Mode.
    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.
    • If the test lamp turns ON and OFF 
  8. Test or replace the E5 backup lamp.
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