U110D

U110D-LOST COMMUNICATION WITH SECURITY SIREN





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

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

- Set Condition:
If the Intrusion Transceiver Module does not receive messages from the Siren.





1. CHECK FOR AN ACTIVE DTC
1. Turn the ignition on.
2. 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. (A414) FUSED B+




1. Gain access to the VTSS Siren.
2. Disconnect the Siren harness connector.
3. Using a 12-volt test light connected to ground, check the (A414) Fused B(+) circuit in the Siren harness connector.

Does the test light illuminate brightly?

Yes

- Go To 3

No

- Repair the (A414) Fused B+ circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

3. (Z909) GROUND CIRCUIT




1. Using a 12-volt test light connected to 12-volts, check the (Z909) Ground circuit at the siren harness connector.

Does the test light illuminate brightly?

Yes

- Go To 4

No

- Repair the (Z909) Ground circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

4. FAULTY SIREN




1. Use the DRBIII(R) and set up as follows:
2. Use the Scope input cable CH7058, Cable to Probe adapter CH7062, and the red and black test probes.
3. Connect the scope input cable to the channel one connector on the DRBIII(R). Attach the red and black leads and the cable to probe adapter to the scope input cable.
4. Select DRBIII(R) Stand-alone.
5. Select lab scope.
6. Select Live.
7. Select 12 volt square wave.
8. Press F2 for Scope.
9. Press F2 and use the down arrow to set voltage range to 20 volts. Press F2 again when complete.
10. Disconnect the Siren harness connector.
11. Connect the black lead to the chassis ground. Connect the red lead to the (D96) Siren Signal Control circuit in the Siren harness connector.
12. Close all doors and arm the VTSS.
13. Observe the voltage displayed on the DRBIII(R) Lab Scope.

Is there a voltage square wave present 1 to 2 seconds?

Yes

- Connect a known good siren and try to reset the DTC. If the DTC does not reset the original siren needs to be replaced. If the DTC does reset replace the Intrusion Transceiver Module.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 5

5. (D96) SIREN SIGNAL CONTROL CIRCUIT SHORT TO BATTERY




1. Disconnect the Siren harness connector.
2. Measure the voltage of the (D96) Siren Signal Control circuit.

Is there any voltage present?

Yes

- Repair the (D96) Siren Signal Control circuit for a short to voltage.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 6

6. (D96) SIREN SIGNAL CONTROL CIRCUIT SHORTED TO GROUND




1. Turn the ignition off.
2. Disconnect the Intrusion Transceiver Module harness connector.
3. Measure the resistance between ground and the (D96) Siren Signal Control circuit.

Is the resistance above 5.0 Ohms?

Yes

- Go To 7

No

- Repair the (D96) Siren Signal Control circuit for a short to ground.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

7. (D96) SIREN SIGNAL CONTROL CIRCUIT OPEN




1. Disconnect the Intrusion Transceiver Module harness connector.
2. Measure the resistance of the (D96) Siren Signal Control circuit between the Intrusion Transceiver Module and the Siren harness connector.

Is the resistance below 5.0 Ohms?

Yes

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

No

- Repair the (D96) Siren Signal Control circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test.