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Home >> Buick >> 2007 >> Allure CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 55 (Object Detection System) >> Diagnostic Information and Procedures >> Rear Parking Assist Inoperative - Red Indicator Flashes >> Circuit/System Testing >> Diagnostic Indicator Pattern 2, 3, 4 and 5

Diagnostic Indicator Pattern 2, 3, 4 and 5

WARNING: This page is about a different car, the 2008 Buick LaCrosse and 2008 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the suspect rear object sensor.
  2. Test for less than 1 ohm between the low reference circuit terminal 2 and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance.
  3. Ignition ON, with the transmission in reverse, test for 8.2-8.8V between the supply voltage circuit terminal 3 and the low reference circuit terminal 2.
    • If less than the specified range, test the supply voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the rear object sensor control module.
    • If greater than the specified range, test the supply voltage circuit for a short to battery. If all circuit tests normal, replace the rear object sensor control module.
  4. Ignition ON, with the transmission in reverse, test for 7.2-9.2V between the signal circuit terminal 1 and the object sensor low reference circuit terminal 2.
    • 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 rear object sensor control module.
    • If greater than the specified range, test the signal circuit for a short to battery. If all circuit tests normal, replace the rear object sensor control module.
  5. If all circuits test normal, test or replace the suspect rear object sensors.
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