WIS Document: 4032

| | Glass breakage sensor Fault symptom Grass breakage sensor does not trip the alarm. Diagnostic procedure 1 Check the operation of the glass breakage sensor | - | Connect the ISAT scan tool. | - | Select "READ VALUES". | - | Select "GLASS BREAK SENSOR". | - | Jingle a bunch of keys or the like near the sensor. The ISAT scan tool display should show a reading of between 10 and 255. Is ISAT indicating the correct value? | yes Continue with point 6. | no Continue with point 2. 2 Check the operation of the glass breakage sensor | - | Disconnect the glass breakage sensor by unplugging the 4-pin connector. | - | Select "READ VALUES". | - | Select "GLASS BREAK SENSOR". If the connector remains open, the ISAT scan tool display should show "0". Connect a jumper lead between pins 1 and 2 of the connector. The scan tool display should now show a reading of 255. Is ISAT indicating the correct value? | yes Change the glass breakage sensor. | no Continue with point 3. 3 Check the operation of the electronic control module | - | Unplug connector H10-4. | - | Select "READ VALUES". | - | With the connector open, the ISAT scan tool display should show "0". With a jumper lead connected between pins 2 and 3 of connector H10-4, the scan tool display should show a reading of 255. Is ISAT indicating the correct value? | yes Continue with point 5. | no Continue with point 4. 4 Check the wiring connected to the electronic control module Conduct a continuity test on the cable assembly between | - | connector H10-4, pin 2 and the control module, pin 7. | - | connector H10-4, pin 3 and the control module, pin 5. The resistance should be < 1 ohm. Is the resistance correct? | yes Continue with point 6. | no Repair or replace the wiring harness. 5 Check the wiring connected to the glass breakage sensor Conduct a continuity test on the cable assembly between | - | connector H10-4 (pin 2) and the glass breakage sensor (pin 1). | - | connector H10-4 (pin 3) and the glass breakage sensor (pin 2). The resistance should be < 1 ohm. Is the resistance correct? | yes Carry out a visual inspection of the sensor and connector. | no Repair or replace the wiring harness. If nothing can be found that can be corrected, change the glass breakage sensor. 6 Final check | - | Disconnect the ISAT scan tool. | - | Close all doors. | - | Arm the alarm and wait until the LED flashes at the rate of 1 flash every 2 seconds. | - | Jingle a bunch of keys close to the sensor. Does the alarm go off? | yes The remedial measures taken were correct or the fault is of intermittent nature. | no See "Before replacing a control module".