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Home >> Chevrolet >> 2019 >> Sonic LS, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 44 (Lighting System) >> Diagnostic Information And Procedures >> DTC B2625 >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2018 Chevrolet Sonic. However, it is still accessible from the selected car via links, so may be relevant.
  1. Vehicle OFF, disconnect the harness connector at the appropriate component below.
    • K33 HVAC Control Module
    • P43 Collision Alert Indicator
    • S48E Multifunction Switch - Center Console
    • S70L Steering Wheel Controls Switch - Left
    2. 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.

  2. Vehicle in Service Mode, verify a test lamp illuminates between each control circuit terminal listed below and ground.
    • K33 HVAC Control Module terminal 9 - X2
    • P43 Collision Alert Indicator terminal 1
    • S48E Multifunction Switch - Center Console terminal 8
    • S70L Steering Wheel Controls Switch - Left terminal 5
    • If the test lamp does not illuminate 
    1. Vehicle 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.
      • Go to next step: 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 
  3. Verify a test lamp does not illuminate at FULL intensity between each control circuit terminal listed below and ground.
    • K33 HVAC Control Module terminal 9 - X2
    • P43 Collision Alert Indicator terminal 1
    • S48E Multifunction Switch - Center Console terminal 8
    • S70L Steering Wheel Controls Switch - Left terminal 5
    • If the test lamp illuminates at FULL intensity 
    1. Vehicle OFF, disconnect the X1 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.
    • Go to next step: If the test lamp does not illuminate at FULL intensity 
  4. Test or replace the component with the inoperative switch indicator.
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