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Home >> Cadillac >> 2012 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1028 (Object Detection System) >> Diagnostic Information and Procedures >> DTC B0958, B0959, B0960, or B0961 >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector of the appropriate rear object sensor.
  2. Ignition OFF for 30 seconds, test for less than 5.0 ohms 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. If the circuit tests normal, replace the object alarm module.
  3. Ignition ON, transmission in REVERSE, test for 8.0-9.0 volts between the rear object sensor supply voltage circuit terminal 1 and ground.
    • If greater than the specified range, test the supply voltage circuit for a short to voltage. If the circuit tests normal, replace the object alarm module.
    • 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 object alarm module.
  4. Ignition OFF, connect the appropriate rear object sensor and disconnect X1 harness connector at the object alarm module.
  5. Ignition ON, test for less than 1.0V between signal circuit and ground of the appropriate rear object sensor listed below:
    • LR middle object sensor signal circuit terminal 3
    • LR corner object sensor signal circuit terminal 5
    • RR middle object sensor signal circuit terminal 2
    • RR corner object sensor signal circuit terminal 1
    • If greater than the specified range, test the signal circuit for a short to voltage.
  6. Ignition OFF, test for infinite resistance between signal circuit and ground of the appropriate rear object sensor listed below:
    • LR middle object sensor signal circuit terminal 3
    • LR corner object sensor signal circuit terminal 5
    • RR middle object sensor signal circuit terminal 2
    • RR corner object sensor signal circuit terminal 1
    • If less than the specified value, test the signal circuit for a short to ground.
  7. Test for less than 2 ohms between the sensor signal circuit terminal 3 and signal circuit of the appropriate rear object sensor listed below:
    • LR middle object sensor signal circuit terminal 3
    • LR corner object sensor signal circuit terminal 5
    • RR middle object sensor signal circuit terminal 2
    • RR corner object sensor signal circuit terminal 1
    • If greater than the specified range, test the signal circuit for an open/high resistance.
    8. IMPORTANT: Because the object alarm module does not update rear object sensor data when a DTC is set, the diagnostic can not determine whether the module or the sensor is causing the DTC to set.
  8. If all circuits test normal, test or replace the appropriate rear object alarm sensor and verify that the DTC does not reset.
    • If the DTC resets, replace object alarm module.
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