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Circuit/System Testing

Hazard Warning Switch Malfunction

  1. Ignition OFF, scan tool disconnected, all doors closed, all accessories OFF, disconnect the harness connector at the S48A Multifunction Switch - Instrument Panel. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 15Ω between the ground circuit terminal 15 and ground.
    • If 15Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2Ω in the ground circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, repair the open/high resistance in the ground connection.
    • If less than 15Ω 
  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 signal circuit terminal 6 and ground.
      • 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 3A fused jumper wire between the signal circuit terminal 6 and ground.
  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 1V between the signal circuit terminal 6 and ground.
      • If 1V or greater, repair the short to voltage on the circuit.
      • If less than 1V
    3. Test for less than 2Ω in the signal circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, replace the K9 body Control Module.
    • If Active 
  7. Test or replace the S48A Multifunction Switch - Instrument Panel.

Hazard Warning Switch Backlighting Malfunction

  1. Ignition OFF, scan tool disconnected, all doors closed, all accessories OFF, disconnect the harness connector at the S48A Multifunction Switch - Instrument Panel. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 15Ω between the ground circuit terminal 15 and ground.
    • If 15Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2Ω in the ground circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, repair the open/high resistance in the ground connection.
    • If less than 15Ω 
  3. Connect a test lamp between the control circuit terminal 7 and ground, ignition ON.
  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 2Ω in the control circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, 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 1V between the control circuit terminal and ground.
      • If 1V or greater, repair the short to voltage on the circuit.
      • If less than 1V, replace the K9 body Control Module.
    • If the test lamp turns ON and OFF 
  5. Test or replace the S48A Multifunction Switch - Instrument Panel.
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