Circuit/System Testing

Chevrolet/GMC

1. Ignition OFF and all vehicle systems 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 10 Ω between the ground circuit terminal 14 and ground.
   • If 10 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 ground circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
   • If less than 10 Ω 
3. Verify the scan tool Parking Assist Switch parameter is Inactive.
   • If the parameter is not Inactive 
   1. Ignition OFF, disconnect the X1 harness connector at the K41 Front and Rear Parking Assist Control Module.
   2. Test for infinite resistance between the signal circuit terminal 9 and ground.
      • If less than infinite resistance, repair the short to ground on the signal circuit.
      • lf infinite resistance, replace the K41 Front and Rear Parking Assist Control Module.
   • If the parameter is Inactive 
4. Connect a 3 A fused jumper wire between the signal circuit terminal 9 and ground.
5. Verify the scan tool Parking Assist Switch parameter is Active.
   • If the parameter is not Active 
   1. Ignition OFF, disconnect the X1 harness connector at the K41 Front and Rear Parking Assist Control Module, ignition ON.
   2. Test for less than 1 V between the control circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit
      • If less than 1 V, replace the K41 Front and Rear Parking Assist Control Module.
   3. Ignition OFF.
   4. 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 K41 Front and Rear Parking Assist Control Module.
   • If the parameter is Active 
6. Test or replace the S48A Multifunction Switch - Instrument Panel.