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Ultrasonic Sensor Input Test

  1. Carefully pry off the ultrasonic sensor cover (A) with a small screwdriver.
  1. Remove the mounting screws.
  1. Disconnect the 3P connector (B) from the ultrasonic sensor.
  1. Inspect the connector and socket terminals to be sure they are all making good contact.
    • If the terminals are bend, loose or corroded, repair them as necessary, and recheck the system.
    • If the terminals look OK, go to Step 5 .
  1. With the connector still disconnected, make these input tests at the connector.
    • If any test indicates a problem, find and correct the cause, then recheck the system.
    • If all the input tests prove OK, the ultrasonic sensor must be faulty, replace it.
    Test condition
    Test: Desired result
    Possible cause if desired result is not obtained
    Under all conditions
    Measure the voltage to ground: There should be battery voltage.
    • Blown No. 1 (10 A) fuse in the under-dash fuse/relay box
    • An open in the wire
    Alarm control siren 6P connector disconnected
    Check for continuity between the No. 2 terminal and No. 4 terminal of the alarm control siren: There should be continuity.
    An open in the wire
    Check for continuity to ground: There should be no continuity.
    A short to ground in the wire
    Under all conditions
    Check for continuity to ground: There should be continuity.
    • Poor ground (G602)
    • An open in the wire