U1179

U1179-LOST COMMUNICATION WITH INTRUSION SENSOR 3





For a complete wiring diagram Refer to Diagrams/Electrical


- When Monitored:
Continuously while the VTSS is armed.

- Set Condition:
If the Intrusion Transceiver Module does not receive messages from the Console Intrusion Sensor over the LIN bus.








Diagnostic Test


1. INTERMITTENT DTC
With the scan tool, erase the current Intrusion Transceiver Module DTC's.
Turn the ignition off.
Arm the VTSS and wait 1 minute.
Disarm the VTSS and turn the ignition on.
Using the scan tool, read ITM DTC(s).
Does the scan tool display the same DTC?

Yes


- Go To2


No


- The condition that caused this symptom is currently not present. Inspect the related wiring harness for a possible intermittent condition. Look for any chafed, pierced, pinched or partially broken wires.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test




2. (A412) FUSED B+ OPEN




Disconnect the Console Intrusion Sensor connector.
Using a 12-volt test light connected to ground, check the (A412) Fused B(+) circuit in the Console Intrusion Sensor connector.
Does the test light illuminate brightly?

Yes


- Go To3


No


- Repair the (A412) Fused B+ circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test




3. (Z910) GROUND CIRCUIT OPEN




Using a 12-volt test light connected to 12-volts, check the (Z910) Ground circuit at the Console Intrusion Sensor connector.
Does the test light illuminate brightly?

Yes


- Go To4


No


- Repair the (Z910) Ground circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test




4. LIN BUS VOLTAGE




Measure the voltage of the (D122) LIN Bus circuit at the Console Intrusion Sensor connector with the key on and off.
Observe the voltage displayed on the voltmeter.
Is the voltage between 1 and 12 volts?

Yes


- Replace the Console Intrusion Sensor.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test


No


- Go To5




5. (D122) LIN BUS CIRCUIT OPEN




Disconnect the Intrusion Transceiver Module harness connector.
Measure the resistance of the (D122) LIN Bus circuit between the Intrusion Transceiver Module and the Console Intrusion Sensor connector.
Is the resistance below 3.0 ohms?

Yes


- Replace the Intrusion Transceiver Module.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test


No


- Repair the (D122) LIN Bus circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test