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Circuit/System Testing

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  1. Ignition OFF, disconnect the harness connector at the B16 Backup Lamp Switch.
  2. Test for less than 5 Ω between the ground circuit terminal 2 and ground.
    • If 5 Ω or greater 
    1. 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.
    • Go to next step: If less than 5 Ω 
  3. Ignition ON, transmission in neutral position.
  4. Verify the scan tool Reverse Position Switch parameter is Off.
    • If the parameter ON 
    1. Disconnect the X1 harness connector at the K20 Engine Control Module.
    2. Test for infinite resistance between the signal circuit terminal 1 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K20 Engine Control Module.
    • Go to next step: If the parameter is OFF 
  5. Ignition ON, install a 3 A fused jumper wire between the signal circuit terminal 1 at the B16 Backup Lamp Switch harness connector and ground.
  6. Verify the scan tool Reverse Position Switch parameter is On.
    • If the parameter is Off 
    1. Disconnect the X1 harness connector at the K20 Engine Control Module.
    2. 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 K20 Engine Control Module.
    • Go to next step: If the parameter is On 
  7. Test or replace the B16 Backup Lamp Switch.
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