B1A88

B1A88-92-ULTRASONIC SENSOR CIRCUIT - PERFORMANCE OR INCORRECT OPERATION

For a complete wiring diagram, refer to the Wiring Information.

- When Monitored:
Continuously while the Vehicle Theft and Security System (VTSS) is armed.

- Set Condition:
If the Intrusion Transceiver Module (ITM) does not receive the correct message back from the Intrusion Sensors.





1. CHECK FOR AN ACTIVE DTC
1. Turn the ignition off and remove the key from the ignition.
2. Lock and close all doors to allow the VTSS to go from pre-arm to armed status and wait one minute.
3. Disarm the VTSS.
4. Turn the ignition on.
5. With the scan tool, read DTCs.

Does the scan tool display this DTC as active?

Yes

- Go To 2

No

- Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

2. CHECK THE INTRUSION MODULE SENSORS
1. Turn the ignition off.
2. Disconnect the Intrusion Module Sensors harness connector.
3. Using a volt/ohm meter set to measure capacitance, measure the capacitance of each sensor.

Is the capacitance range of each sensor between 1nF and 3nF?

Yes

- Replace the ITM. Intrusion Module - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Replace the Intrusion Module Sensors. Intrusion Module Sensor - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.