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Circuit/System Testing

WARNING: This page is about a different car, the 2015 Chevrolet Trax and 2015 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.

Hazard Warning Switch Malfunction

  1. Ignition OFF, scan tool disconnected, all doors closed, all accessories OFF, disconnect the harness connector at the appropriate component listed below. It may take up to 2 min for all vehicle systems to power down.
    • S26 Hazard Warning Switch - Trax
    • S48C Multifunction Switch 1 - Instrument Panel - Encore
  2. Test for less than 5 Ω between the appropriate ground circuit terminal listed below and ground.
    • S26 Hazard Warning Switch terminal 3 - Trax
    • S48C Multifunction Switch 1 - Instrument Panel terminal 7 - Encore
    • If 5 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • If less than 5 Ω 
  3. Ignition ON.
  4. Verify the scan tool Hazard Lamps Switch parameter is Inactive.
    • If not Inactive 
    1. Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the appropriate signal circuit terminal listed below and ground.
      • S26 Hazard Warning Switch terminal 1 - Trax
      • S48C Multifunction Switch 1 - Instrument Panel terminal 10 - Encore
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K9 Body Control Module.
    • If Inactive 
  5. Install a 3 A fused jumper wire between the appropriate signal circuit terminal listed below and ground.
    • S26 Hazard Warning Switch terminal 1 - Trax
    • S48C Multifunction Switch 1 - Instrument Panel terminal 10 - Encore
  6. Verify the scan tool Hazard Lamps Switch parameter is Active.
    • If not Active 
    1. Ignition OFF, disconnect the X2 harness connector at the K9 Body Control Module, ignition ON.
    2. Test for less than 1 V between the appropriate signal circuit terminal listed below and ground.
      • S26 Hazard Warning Switch terminal 1 - Trax
      • S48C Multifunction Switch 1 - Instrument Panel terminal 10 - Encore
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V
    3. Test for less than 2 Ω in the signal 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.
    • If Active 
  7. Test or replace the appropriate hazard warning switch.

Hazard Warning Switch Backlighting Malfunction

  1. Ignition OFF, scan tool disconnected, all doors closed, all accessories OFF, disconnect the harness connector at the appropriate component listed below. It may take up to 2 min for all vehicle systems to power down.
    • S26 Hazard Warning Switch - Trax
    • S48C Multifunction Switch 1 - Instrument Panel - Encore
  2. Test for less than 5 Ω between the appropriate ground circuit terminal listed below and ground.
    • S26 Hazard Warning Switch terminal 3 - Trax
    • S48C Multifunction Switch 1 - Instrument Panel terminal 7 - Encore
    • If 5 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • If less than 5 Ω 
  3. Connect a test lamp between the appropriate control circuit terminal listed below and ground, ignition ON.
    • S26 Hazard Warning Switch terminal 2 - Trax
    • S48C Multifunction Switch 1 - Instrument Panel terminal 5 - Encore
  4. Verify the test lamp turns ON and OFF when commanding the Hazard Lamps Switch Backlight ON and OFF with a scan tool.
    • If the test lamp is always OFF 
    1. Ignition 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.
      • 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.
    • If the test lamp is always ON 
    1. Ignition OFF, disconnect the X1 harness connector at the K9 Body Control Module, ignition ON.
    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.
    • If the test lamp turns ON and OFF 
  5. Test or replace the appropriate hazard warning switch.
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