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Home >> Cadillac >> 2007 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1809 (Object Detection System - Park Assist System) >> Diagnostic Information and Procedures >> DTC B0958, B0959, B0960, or B0961 >> Circuit/System Testing
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Circuit/System Testing

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Single Object Alarm Sensor DTC Set

  1. Ignition OFF, disconnect the harness connector at the appropriate object alarm sensor.
  2. Ignition OFF for 30 seconds, test for less than 20 Ω 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 V between the voltage reference circuit terminal 1 and ground.
    • If greater than the specified range, test the voltage reference circuit for a short to voltage. If the circuit tests normal, replace the object alarm module.
    • If less than the specified range, test the voltage reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the object alarm module.
  4. Ignition OFF, remove the malfunctioning object alarm sensor and swap locations with another properly functioning object alarm sensor. Connect the harness connector at both sensors.
  5. Ignition ON, verify the DTC is set for the new location in which the malfunctioning object alarm sensor is installed.
    • If the DTC does not set for the new location, test the signal circuit terminal 3 for a short to voltage, short to ground, or an open/high resistance. If the circuit tests normal, replace the object alarm module.
  6. If the DTC sets for the new location in which the malfunctioning object alarm sensor is installed, replace the appropriate object alarm sensor.

Multiple Object Alarm Sensor DTCs Set

  1. Ignition OFF, disconnect the harness connector at each of the object alarm sensors.
  2. Ignition OFF for 30 seconds, test for less than 20 Ω 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 V between the voltage reference circuit terminal 1 and ground.
    • If greater than the specified range, test the voltage reference circuit for a short to voltage. If the circuit tests normal, replace the object alarm module.
    • If less than the specified range, test the voltage reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the object alarm module.
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