Circuit/System Testing

Test A

1. Ignition OFF and all vehicle systems OFF. Disconnect the connector at the appropriate Suspension Position Sensor:
   • DTC C103C = B152LF Front Suspension Automatic Forward Lighting Position Sensor - Left
   • DTC C103D = B152LR Rear Suspension Automatic Forward Lighting Leveling Position Sensor - Left
   • DTC C103E = B11RF Front Suspension 4 Corner Leveling System Position Sensor - Right
   • DTC C103F = B11RR Rear Suspension 2 or 4 Corner Air Leveling Position Sensor - Right
2. Ignition ON.
3. Verify a test lamp illuminates between the low reference circuit terminal 2 and ground.
   • If test lamp does not illuminate 
   1. Test the appropriate circuit for an open/high resistance:
      • DTC C103C = Circuit 1206
      • DTC C103D = Circuit 1209
      • DTC C103E = Circuit 1212
      • DTC C103F = Circuit 1215
      • If an open/high resistance is found, repair the circuit fault.
      • Go to next step: If an open/high resistance is not found
   2. Replace the K5 Automatic Level Control Module.
   • Go to next step: If test lamp illuminates 
4. Test for 4.8 - 5.2 V between the 5 V reference circuit terminal 1 and ground.
   • If less than 4.8 V 
   1. Test the appropriate circuit for a short to ground:
      • DTC C103C = Circuit 1205
      • DTC C103D = Circuit 1208
      • DTC C103E = Circuit 1211
      • DTC C103F = Circuit 1214
      • If a short to ground is found, repair the circuit fault.
      • Go to next step: If a short to ground is not found
   2. Test the appropriate circuit for an open/high resistance:
      • DTC C103C = Circuit 1205
      • DTC C103D = Circuit 1208
      • DTC C103E = Circuit 1211
      • DTC C103F = Circuit 1214
      • If an open/high resistance is found, repair the circuit fault.
      • Go to next step: If an open/high resistance is not found
   3. Replace the K5 Automatic Level Control Module.
   • If greater than 5.2 V 
   1. Test the appropriate circuit for a short to voltage:
      • DTC C103C = Circuit 1205
      • DTC C103D = Circuit 1208
      • DTC C103E = Circuit 1211
      • DTC C103F = Circuit 1214
      • If a short to voltage is found, repair the circuit fault.
      • Go to next step: If a short to voltage is not found
   2. Replace the K5 Automatic Level Control Module.
   • Go to next step: If between 4.8 - 5.2 V 
5. Ignition OFF. Disconnect the connector at the K5 Automatic Level Control Module. Ignition ON.
6. Test for less than 1 V between the signal circuit terminal 3 and ground.
   • If 1 V or greater 

     Repair the short to voltage on the appropriate circuit.

   • Go to next step: If less than 1 V 
7. Ignition OFF.
8. Test for infinite resistance between signal circuit terminal 3 and ground.
   • If less than infinite resistance 

     Repair the short to ground on the circuit.

   • Go to next step: If infinite resistance 
9. Test for less than 2 Ω between signal circuit terminal 3 and the other end of the circuit.
   • If greater than 2 Ω 

     Repair the open/high resistance on the circuit.

   • Go to next step: If less than 2 Ω 
10. Test or replace the appropriate Suspension Position Sensor.
11. Operate vehicle under the Conditions for Running the DTC.
12. Verify DTCs C103C, C103D, C103E, or C103F do not set.
    • If any of the DTCs set 

      Replace the K5 Automatic Level Control Module.

    • Go to next step: If none of the DTCs set 
13. All OK.

Test B

1. Verify that all Suspension Position Sensors are installed properly and are not damaged.
   • If all sensors are not installed properly or damage is found 
   1. Reinstall Suspension Position Sensors properly or replace as necessary.
   2. Verify DTCs do not reset.
      • If DTCs reset, replace the K5 Automatic Level Control Module.
      • Go to next step: If DTCs do not reset
   3. All OK.
   • Go to next step: If all sensors are installed properly and no damage is found 
2. Clear DTCs and operate the vehicle under Condition for Running the DTC.
3. Verify DTCs do not reset.
   • If any DTCs reset 

     Replace the appropriate Suspension Position Sensor

   • Go to next step: If DTCs do not reset 
4. All OK.

Test C

1. Ignition ON.
2. Adjust vehicle ride height to within specification using Inflate/Deflate functions in scan tool. Refer to: Trim Height Inspection (AXK) , or Trim Height Inspection (AXP) , and Trim Height Specifications
3. Perform Automatic Level Control Trim Height Learn procedure. Refer to: Automatic Level Control Trim Height Learn 
4. Clear DTCs.
5. Verify DTCs do not reset.
   • If DTCs reset 

     Replace the K5 Automatic Level Control Module

   • Go to next step: If DTCs do not reset 
6. All OK.