Circuit/System Testing (with UGN)

Parking Assist Switch Malfunction

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S107 Parking Assist On/Off Switch. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 Ω between the ground circuit terminal 10 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 circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
   • If less than 10 Ω 
3. Ignition ON.
4. Verify the scan tool Park Assist Switch parameter is Inactive.
   • If not Inactive 
   1. Ignition OFF, disconnect the harness connector X1 at the K124 Active Safety Control Module.
   2. Test for infinite resistance between the signal circuit terminal 11 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K124 Active Safety Control Module.
   • If Inactive 
5. Install a 3 A fused jumper wire between the signal circuit terminal 5 and the ground circuit terminal 10.
6. Verify the scan tool Park Assist Switch parameter is Active.
   • If not Active 
   1. Ignition OFF, disconnect the harness connector at the K124 Active Safety Control Module, ignition ON.
   2. Test for less than 1 V between the signal circuit and ground.
      • 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 K124 Active Safety Control Module.
   • If Active 
7. Test or replace the S107 Parking Assist On/Off Switch.

Parking Assist Switch Indicator Malfunction

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S107 Parking Assist On/Off Switch. It may take up to 2 minutes for all vehicle systems to power down. Ignition ON, interior dimming set to full bright.
2. Verify a test lamp illuminates between the ignition circuit terminal 1 and ground.
   • If the test lamp does not illuminate 
   1. Ignition OFF.
   2. Test for less than 2 Ω in the ignition circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the short to ground in the circuit.
   • If the test lamp illuminates 
3. Connect a test lamp between the control circuit terminal 7 and the ignition circuit terminal 1.
4. Verify the lamp turns ON and OFF when commanding the Park Assist Switch Indicator ON and OFF with a scan tool.
   • If the test lamp is always OFF 
   1. Ignition OFF, disconnect the X1 harness connector at the K124 Active Safety 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
   3. Ignition OFF.
   4. 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 K124 Active Safety Control Module.
   • If the test lamp is always ON 
   1. Ignition OFF, disconnect the X1 harness connector at the K124 Active Safety 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, replace the K182 Parking Assist Control Module.
   • If the test lamp turns ON and OFF 
5. All OK.