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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 41 (Wiring Systems And Power Management - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC B2B0D or B2B0E >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector:X2 @ K56 Serial Data Gateway Module
  3. Test for less than 1 V between the test points: Ignition circuit terminal 23 & Ground
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • Go to next step: If less than 1 V 
  4. Ignition - On / Vehicle - In Service Mode
  5. Verify a test lamp turns On between the test points:Ignition circuit terminal 23 & Ground
    • If the test lamp does not turn On and the circuit fuse is OK 
    1. Ignition/Vehicle - Off
    2. Test for less than 2 ohms between the test points:Ignition circuit terminal 23 @ Component harness & Fuse
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Refer to:Power Mode Mismatch 
    • If the test lamp does not turn On and the circuit fuse is open 
    1. Ignition/Vehicle - Off
    2. Test for infinite resistance between the test points:Ignition circuit terminal 23 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
    • Go to next step: If the test lamp turns On 
  6. Verify voltage at each B+ circuit terminal is within 1 V of the C1 Battery voltage.
    • If not the specified value 

      Repair the high resistance on B+ circuit.

    • Go to next step: If the specified value 
  7. Verify voltage at each ignition circuit terminal is within 1 V of the C1 Battery voltage.
    • If not the specified value 

      Repair the high resistance on ignition circuit.

    • Go to next step: If the specified value 
  8. Replace the component:K56 Serial Data Gateway Module
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