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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 87 (Lighting System - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> DTC C10A1 >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect the connector at the B162R Vertical Body Acceleration Sensor - Rear, ignition ON.
  2. Verify a test lamp illuminates between low reference circuit terminal 2 and B+.
    • If the test lamp does not illuminate 
    1. Test circuit 2185 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found.
    2. Replace the E13LA Headlamp Assembly - Left.
    • Go to next step: If the test lamp illuminates 
  3. Test for 4.8 V - 5.2 V between the 5 V reference terminal 1 and ground.
    • If less than 4.8 V 
    1. Test circuit 2165 for a short to ground.
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found
    2. Test circuit 2165 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found.
    3. Replace the E13LA Headlamp Assembly - Left.
    • If greater than 5.2 V 
    1. Test circuit 2165 for a short to voltage.
      • If a short to voltage is found, repair the fault on the circuit.
      • Go to next step: If a short to voltage is not found.
    2. Replace the E13LA Headlamp Assembly - Left.
    • Go to next step: If 4.8 V - 5.2 V 
    1. Test circuit 2184 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found.
    2. Test circuit 2184 for a short to ground.
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found
    3. Test circuit 2184 for a short to voltage.
      • If a short to voltage is found, repair the fault on the circuit.
      • Go to next step: If a short to voltage is not found.
  4. Replace the B162R Vertical Body Acceleration Sensor - Rear.
  5. Verify the DTC does not set while operating the vehicle within the conditions for running the DTC.
    • If the DTC sets 

      Replace the E13LA Headlamp Assembly - Left

    • Go to next step: If the DTC does not set 
  6. All OK.
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