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Home >> Chevrolet >> 2012 >> Corvette Base, 2D Convertible, Automatic Trans >> Repair and Diagnosis >> Steering >> Steering Wheel And Steering Column >> Diagnostic Information and Procedures >> Steering Column Does Not Telescope In/Out >> Circuit/System Testing
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Circuit/System Testing

Telescope Switch Circuit Malfunction

  1. Ignition OFF, disconnect the harness connector at the telescope switch.
  2. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal C and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  3. Verify the all the scan tool telescope switch parameters are Inactive.
    • Telescope Forward Switch - signal circuit terminal B
    • Telescope Reverse Switch - signal circuit terminal A
    • If any of the parameters are not the specified value, test the appropriate signal circuit terminal for a short to voltage. If the circuit tests normal, replace the DDSA.
  4. Install a 3A fused jumper wire between the appropriate signal circuit terminal and the B+ circuit terminal C. Verify the appropriate scan tool telescope switch parameter is Active.
    • Telescope Forward Switch - signal circuit terminal B
    • Telescope Reverse Switch - signal circuit terminal A
    • If not the specified value, test the appropriate signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the DDSA.
  5. If all circuits test normal, test or replace the telescope switch.

Telescope Sensor Circuit Malfunction

  1. Ignition OFF, disconnect the harness connector at the appropriate telescope actuator.
  2. Ignition OFF, test for less than 2.0 ohms of resistance between the low reference circuit terminal E and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the MSM.
  3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal D and ground.
    • If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the MSM.
    • If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.
  4. Verify the appropriate scan tool telescope sensor parameter is less than 0.2 volts.
    • If greater than the specified range, test the signal circuit terminal C for a short to voltage. If the circuit tests normal, replace the MSM.
  5. Install a 3A fused jumper wire between the signal circuit terminal C and the 5-volt reference circuit terminal D. Verify the appropriate scan tool telescope sensor parameter is greater than 4.8 volts.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.
  6. If all circuits test normal, test or replace the appropriate telescope actuator.

Telescope Actuator Circuit Malfunction

  1. Ignition OFF, disconnect the harness connector at the telescope actuator.
  2. Install a test lamp between the control circuit terminal A and the control circuit terminal B.
  3. Command the column to telescope in and out using the telescope switch. The test lamp should illuminate with each command.
    • If the test lamp does not illuminate, test both control circuits for a short to ground or an open/high resistance. If the circuits test normal, replace the MSM.
  4. If all circuits test normal, test or replace the telescoping actuator.
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