Security Alarm Ultrasonic Sensor Input Test
  1. Turn the map light switch off.
  1. Carefully pry off the map light lens (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 6 .
  1. 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, replace the ultrasonic sensor.
    Cavity
    Wire
    Test condition
    Test: Desired result
    Possible cause if result is not obtained
    1
    WHT
    Under all conditions
    Check for voltage to ground: There should be battery voltage.
    • Blown No. 16 (15 A) fuse in the under-hood fuse/relay box
    • An open in the wire
    2
    GRN
    Under all conditions
    Check for continuity between the No. 2 terminal and No. 2 terminal of the alarm control siren: There should be continuity.
    An open in the wire
    3
    BLK
    Under all conditions
    Check for continuity to ground: There should be continuity.
    • Poor ground (G501)
    • An open in the wire