LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Cadillac >> 2007 >> CTS Base, 3.6 7, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 164 (Object Detection System) >> Diagnostic Information and Procedures >> DTC B0958, B0959, B0960, or B0961 >> Circuit/System Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Circuit/System Testing

WARNING: This page is about a different car, the 2007 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector of the suspect rear object alarm sensor.
  2. Test for less than 1.0 ohm of resistance between the low reference circuit and ground.
    • If greater than 1.0 ohm, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the rear object alarm module.
  3. Ignition ON with the transmission in reverse, test for 8.2 V-8.8 V between the rear object alarm sensor supply voltage circuit and the low reference circuit.
    • If greater than 8.8 V, test the supply voltage circuit for a short to voltage. If the circuit tests normal, replace the object alarm module.
    • If less than 8.2 V, test the supply voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the rear 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:
    • Left Rear middle object sensor signal circuit terminal 3
    • Left Rear corner object sensor signal circuit terminal 5
    • Right Rear middle object sensor signal circuit terminal 2
    • Right Rear 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:
    • Left Rear middle object sensor signal circuit terminal 3
    • Left Rear corner object sensor signal circuit terminal 5
    • Right Rear middle object sensor signal circuit terminal 2
    • Right Rear 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:
    • Left Rear middle object sensor signal circuit terminal 3
    • Left Rear corner object sensor signal circuit terminal 5
    • Right Rear middle object sensor signal circuit terminal 2
    • Right Rear corner object sensor signal circuit terminal 1
    • If greater than the specified range, test the signal circuit for an open/high resistance.
    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.
scientia non olet · About LEMON Manuals