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Home >> Chevrolet >> 2017 >> City Express LS >> Repair and Diagnosis >> Accessories & Equipment >> Drivers Assistance Systems - ADAS >> Object Detection And Pedestrian Protection System >> Diagnostic Information And Procedures >> Parking Assist System Malfunction >> Circuit/System Testing

Circuit/System Testing

NOTE:

Perform the Circuit/System Verification before proceeding with the Circuit/System Testing

Module Malfunction

  1. Ignition OFF, disconnect the harness connector at the K41R Rear Parking Assist Control Module. 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 3 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the K41R Rear Parking Assist Control Module.
    2. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K41R Rear Parking Assist Control Module.
    • Go to next step: If less than 10 Ω 
  3. Ignition ON.
  4. Verify a test lamp illuminates between the ignition circuit terminal 1 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    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, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the ignition circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the disconnected control module.
    • Go to next step: If the test lamp illuminates 
  5. Ignition ON, park brake applied, transmission in reverse, Verify a test lamp illuminates between the backup lamp supply circuit terminal 4 and ground.
    • If the test lamp does not illuminate 
    1. Verify the backup lamps illuminate
    2. Test for less than 2 Ω between the backup lamp supply circuit and splice J304.
      • If greater than 2 Ω, repair the open/high resistance on the circuit.
    • Go to next step: If the test lamp illuminates 
  6. Ignition OFF and all vehicle systems OFF, connect the K41R Rear Parking Assist Control Module.
  7. Disconnect the harness connector at the S107 Parking Assist ON/OFF Switch. It may take up to 2 min for all vehicle systems to power down.
  8. Test for less than 10 Ω between the control circuit terminal 3 and ground.
    • If greater than 10 Ω 
    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.
    • Go to next step: If less than 10 Ω 
  9. Ignition ON, wait 30s
    NOTE:

    When the ignition is turned ON, there is a voltage spike of B+ for a few seconds and then the voltage drops to about 5V.

  10. Test for 4 - 6V between the control circuit terminal 5 and ground.
    • If less than 4V 
    1. Ignition OFF, disconnect the harness connector at the K41R Rear Parking Assist Control Module.
    2. Test for infinite resistance between the 5V reference circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Test for less than 2 Ω in the 5V reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K41R Rear Parking Assist Control Module.
    • If greater than 6V 
    1. Ignition OFF, disconnect the harness connector at the K41R Rear Parking Assist Control Module, ignition ON.
    2. Test for less than 1V between the 5V reference circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1V, replace the K41R Rear Parking Assist Control Module.
    • Go to next step: If between 4 - 6V 
  11. Test or replace the S107 Parking Assist ON/OFF Switch.

Sensor Malfunction

  1. Ignition OFF and all vehicle systems OFF, disconnect the harness at the appropriate B78 Front Object Sensor. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the low reference circuit terminal 3 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the K41R Rear Parking Assist Control Module.
    2. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K41R Rear Parking Assist Control Module.
    • Go to next step: If less than 10 Ω 
  3. Ignition ON.
  4. Test for greater than 11 V between the 12 V reference circuit terminal 1 and ground.
    • If less than 11V 
    1. Ignition OFF, disconnect the harness connector at the K41R Rear Parking Assist Control Module.
    2. Test for infinite resistance between the 12V reference circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Test for less than 2 Ω in the 12 V reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K41R Rear Parking Assist Control Module.
    • Go to next step: If greater than 11 V 
  5. Test for less than 1 V between the signal circuit terminal 2 and ground.
    • If greater than 1 V 
    1. Ignition OFF, disconnect the harness connector at the K41R Rear Parking Assist Control Module, ignition ON.
    2. Test for less than 1 V between the signal circuit and ground.
      • If greater than 1 V, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K41R Rear Parking Assist Control Module
    • Go to next step: If the test lamp illuminates 
  6. Test for less than infinite resistance between the signal circuit terminal 2 and ground.
    • If less than infinite resistance 
    1. Ignition OFF, disconnect the harness connector at the K41R Rear Parking Assist Control Module.
    2. Test for infinite resistance between the 12 V reference circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K41R Rear Parking Assist Control Module.
    • Go to next step: If infinite resistance 
  7. Ignition OFF, disconnect the harness connector at the K41R Rear Parking Assist Control Module.
  8. Test for less than 2 Ω between the appropriate harness connector terminal listed below end to end.
    • B78G Rear Object Sensor - Left Outer terminal 2 and K41R Rear Parking Assist Control Module terminal 10.
    • B78E Rear Object Sensor - Left Middle terminal 2 and K41R Rear Parking Assist Control Module terminal 11.
    • B78F Rear Object Sensor - Right Middle terminal 2 and K41R Rear Parking Assist Control Module terminal 12.
    • B78H Rear Object Sensor - Right Outer terminal 2 and K41R Rear Parking Assist Control Module terminal 13.
    • If greater than 2 Ω 
    1. Ignition OFF, disconnect the X2 harness connector at the K41R Rear Parking Assist Control Module.
    2. Test for infinite resistance between the signal 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 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 K41R Rear Parking Assist Control Module.
    • Go to next step: If less than 2 Ω 
  9. Test or replace the B78 Rear Object Sensor.

Park Assist OFF Switch Signal Circuit 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 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the control circuit terminal 8 and ground.
    • If greater than 10 Ω 
    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.
    • Go to next step: If less than 10 Ω 
  3. Ignition ON.
  4. Verify a test lamp illuminates between the control circuit terminal 6 and ground.
    • If the test lamp does not illuminate 
    1. Ignition OFF, disconnect the harness connector at the K41R Rear Parking Assist 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.
      • Go to next step: If infinite resistance
    3. Test for less than 2 Ω in the 12V reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K41R Rear Parking Assist Control Module.
    • Go to next step: If the test lamp illuminates 
  5. Test or replace the S107 Parking Assist ON/OFF Switch.

Parking Assist OFF Indicator Circuit 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 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the control circuit terminal 3 and ground.
    • If greater than 10 Ω 
    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.
    • Go to next step: If less than 10 Ω 
  3. Ignition ON, wait 30 s
    NOTE:

    When the ignition is turned ON, there is a voltage spike of B+ for a few seconds and then the voltage drops to about 5 V.

  4. Test for 4 - 6 V between the control circuit terminal 5 and ground.
    • If less than 4 V 
    1. Ignition OFF, disconnect the harness connector at the K41R Rear Parking Assist Control Module.
    2. Test for infinite resistance between the 5 V reference circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Test for less than 2 Ω in the 5 V reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K41R Rear Parking Assist Control Module.
    • If greater than 6 V 
    1. Ignition OFF, disconnect the harness connector at the K41R Rear Parking Assist Control Module, ignition ON.
    2. Test for less than 1 V between the 5 V reference circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K41R Rear Parking Assist Control Module.
    • Go to next step: If between 4 - 6 V 
  5. Test or replace the S107 Parking Assist ON/OFF Switch.
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