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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 44 (Lighting System - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Courtesy Lamps Malfunction >> 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 - Disconnect - Harness Connector @ A98 Front Overhead Console Assembly - Ignition - On / Vehicle - In Service Mode
  2. Verify a test lamp turns On between the test points:B+ circuit terminal 1 & Ground
    • If the test lamp does not turn On and the circuit fuse is OK 
    1. Ignition/Vehicle & All vehicle systems - Off - Remove - F30DA Fuse @ X51A Fuse Block - Instrument Panel -
    2. Test for less than 2 ohms between the test points:B+ circuit & Ground
      • If the test lamp does not turn On and the circuit fuse is open 
    3. Ignition/Vehicle & All vehicle systems - Off - Remove - F30DA Fuse @ X51A Fuse Block - Instrument Panel -
    4. Test for infinite resistance between the test points:B+ circuit & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistanceReplace the component:A98 Front Overhead Console Assembly
    • Go to next step: If the test lamp turns On 
  3. Ignition/Vehicle & All vehicle systems - Off - Connect the electrical connector: @ A98 Front Overhead Console Assembly
  4. Ignition/Vehicle & All vehicle systems - Off - Open and close the door.-Driver Door - Disconnect the appropriate electrical connector: @ Component = Inoperative - 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.
    • A98 Front Overhead Console Assembly
    • A3L Sunshade - Left
    • A3R Sunshade - Right
    • E37EL Dome/Reading Lamps - Front Overhead Console Left
    • E37ER Dome/Reading Lamps - Front Overhead Console Right
    • E37R Dome/Reading Lamps - Rear
  5. Test for less than 10 ohms between the test points:Ground circuit terminal @ InoperativeComponent & Chassis Ground
    • A98 Front Overhead Console Assembly
    • A3L Sunshade - Left
    • A3R Sunshade - Right
    • E37EL Dome/Reading Lamps - Front Overhead Console Left
    • E37ER Dome/Reading Lamps - Front Overhead Console Right
    • E37R Dome/Reading Lamps - Rear
    • If 10 ohms or greater 
    1. Ignition Off
    2. Test for less than 2 ohms between the test points:Ground circuit terminal @ Component harness & Ground
      • If 2 ohms or greaterRepair the open/high resistance in the circuit.
      • If less than 2 ohms - Repair the open/high resistance in the ground connection.
      • If less than 10 ohms 
  6. Connect a test lamp between the test points:Control circuit terminal @ Component harness & Ground - Ignition - On / Vehicle - In Service Mode
    • A98 Front Overhead Console Assembly
    • A3L Sunshade - Left
    • A3R Sunshade - Right
    • E37EL Dome/Reading Lamps - Front Overhead Console Left
    • E37ER Dome/Reading Lamps - Front Overhead Console Right
    • E37R Dome/Reading Lamps - Rear
  7. Perform the appropriate scan tool control function:Inadvertent Load Command - On/Off - Verify the test lamp turns On and Off.
    • If the test lamp is always Off 
    1. Ignition Off - Disconnect the electrical connector:x7 @ K9 Body Control ModuleGT
    2. Test for infinite resistance between the test points:Control Circuit & 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 ohms between the test points:Control circuit terminal @ Component harness & Control module harness
      • If 2 ohms or greaterRepair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component:K9 Body Control Module
      • If the test lamp is always On 
    4. Ignition Off - Disconnect the electrical connector :x7 @ K9 Body Control Module - Ignition - On / Vehicle - In Service Mode
    5. Test for less than 1 V between the test points:Control circuit terminal & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component:K9 Body Control Module
    • Go to next step: If the test lamp turns On and Off 
  8. Test or replace the component:Courtesy Lamp - InoperativeG
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