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Home >> Saturn >> 2008 >> Astra XE, Automatic >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Shift Lock Control System >> Diagnostic Information and Procedures >> Transmission Control Lever Malfunction >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the automatic transmission park interlock relay.
  2. Ignition OFF, test for less than 1.0 ohm between the ground circuit terminal 2 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify that a test lamp illuminates between the relay ignition supply voltage circuit terminal 1 and ground.
    • If the test lamp does not illuminate, test for an open or short to ground in the ignition supply voltage circuit. If the circuit tests normal, test or replace the relay.
  4. Ignition ON, depress brake pedal, verify that a test lamp illuminates between the relay signal circuit terminal 5 and ground.
    • If the test lamp does not illuminate, test for an open or short to ground in the relay signal circuit or a short to ground in the automatic transmission shift lock control solenoid control circuit. If the circuits test normal, perform the automatic transmission shift lock solenoid component test. If the solenoid tests normal, replace the stoplamp switch.
  5. Ignition OFF, disconnect the harness connector at the automatic transmission shift lock control solenoid.
  6. Ignition OFF, test for less than 1.0 ohm between the ground circuit terminal 6 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  7. Ignition OFF, verify that a test lamp does not illuminate between the solenoid control circuit terminal 8 and ground.
    • If the test lamp illuminates, test the automatic transmission park interlock relay signal circuit and the automatic transmission shift lock control solenoid control circuits for a short to B+.
  8. Ignition OFF, depress the brake pedal, verify that a test lamp does not illuminate between the control circuit terminal 8 and ground.
    • If the test lamp illuminates, test for a short to B+ in the relay ignition supply voltage circuit. If the circuit tests normal, test or replace the automatic transmission park interlock relay.
  9. Ignition ON, brake pedal not depressed, verify that a test lamp does not illuminate between the control circuit terminal 8 and ground.
    • If the test lamp illuminates, test or replace the stoplamp switch.
  10. Test or replace the automatic transmission shift lock control solenoid.
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