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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 >> DTC B1480 >> 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 the appropriate component:
    • A98 Front Overhead Console Assembly
    • A3L Sunshade - Left - (DH6)
    • A3R Sunshade - Right - (DH6)
    • E37EL Dome/Reading Lamps - Front Overhead Console Left - (CF5)
    • E37ER Dome/Reading Lamps - Front Overhead Console Right - (CF5)
    • E37R Dome/Reading Lamps - Rear - Without (CF5)
  2. Connect a test lamp between the test points:Control circuit terminal @ Component & Ground - Ignition - On / Vehicle - In Service Mode
    • A98 Front Overhead Console Assembly
    • A3L Sunshade - Left - (DH6)
    • A3R Sunshade - Right - (DH6)
    • E37EL Dome/Reading Lamps - Front Overhead Console Left - (CF5)
    • E37ER Dome/Reading Lamps - Front Overhead Console Right - (CF5)
    • E37R Dome/Reading Lamps - Rear - Without CF5
  3. Perform the appropriate scan tool control function:Courtesy Lamps - 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 Module
    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 & 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: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 
  4. Test or replace the component:Courtesy Lamp - Inoperative G
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