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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 127 (Sunroof) >> Diagnostic Information and Procedures >> DTC B3664 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE:

    It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector:A98 Front Overhead Console Assembly
  3. Test for less than 10 ohms between the test points:Low Reference circuit terminal 20@Component harness & Ground
    • If 10 ohms or greater 
    1. Disconnect the appropriate electrical connector:M69 Sunroof Motor
    2. Test for less than 2 ohms between the test points:Low Reference circuit terminal 20@Component harness & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Test or replace the component:M69 Sunroof Motor
    • Go to next step: If less than 10 ohms 
  4. Ignition - On / Vehicle - In Service Mode
  5. Test for 4.5 to 5.5 V between the test points:Signal circuit terminal 9@Component harness & Ground
    • If less than 4.5 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the appropriate electrical connector:M69 Sunroof Motor
    3. Test for infinite resistance between the test points:Signal circuit terminal 9@Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    4. Test for less than 2 ohms between the test points:Signal circuit terminal 9@Component harness & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component:M69 Sunroof Motor
    • If greater than 5.5 V 
    1. Ignition/Vehicle & All vehicle systems - Off
    2. Disconnect the appropriate electrical connector:M69 Sunroof Motor
    3. Test for less than 1 V between the test points:Signal circuit terminal 9@Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component:M69 Sunroof Motor
    • Go to next step: If between 4.5 and 5.5 V 
  6. Test or replace the component:A98 Front Overhead Console Assembly
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