U0231

U0231-LOST COMMUNICATION WITH LIGHT RAIN SENSING MODULE





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

- When Monitored:
Continuously when the ignition is on.

Ignition Off Draw (IOD) fused installed.

- Set Condition:
Bus messages not received from the Rain Sensing Module for approximately two to five seconds.





1. VERIFY DTC IS ACTIVE

NOTE: Make sure the IOD fuse is installed and the battery is fully charged before proceeding.

1. With the scan tool, record and erase the WIN DTCs.
2. Cycle the ignition switch from on to off three times then back to on.
3. Start the engine and run for two minutes.
4. With the scan tool, read the active WIN DTCs.

Does the scan tool display: U0231-LOST COMMUNICATION WITH LIGHT RAIN SENSING MODULE?

Yes

- Go To 2

No

- Stored Lost Communication DTCs and perform the Stored Lost Communication DTCs diagnostic procedure.

2. (F981) FUSED IGNITION SWITCH OUTPUT OPEN





NOTE: Be sure the battery is fully charged before proceeding.

1. Turn the ignition off.
2. Disconnect the Rain Sensor harness connector.
3. Turn the ignition on.
4. Measure the voltage between ground and the (F981) Fused Ignition Switch Output circuit in the Rain Sensor harness connector.

Is the voltage above 12.0 volts?

Yes

- Go To 3

No

- Repair the (F981) Fused Ignition Switch Output circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

3. (Z919) GROUND CIRCUIT OPEN




1. Using the a 12 volt test light connected to 12 volts, check the (Z919) Ground circuit.

NOTE: The test light must illuminate brightly. Compare the brightness to that of a direct connection to the battery.

Does the test light illuminate brightly?

Yes

- Go To 4

No

- Repair the (Z919) Ground circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

4. CHECK THE VOLTAGE OF THE (D508) COM-LIN TIRE PRESSURE MONITOR LAN CIRCUIT




1. Measure the voltage between the (D508) COM-Lin Tire Pressure Monitor LAN circuit and ground in the Rain Sensor connector.

Is the voltage below 7.0 volts?

Yes

- Go To 5

No

- Replace the Rain Sensor. Light Rain Sensor Module (LRSM) - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

5. (D508) COM-LIN TIRE PRESSURE MONITOR LAN CIRCUIT OPEN




1. Turn the ignition off.
2. Disconnect the WIN Module harness connector.
3. Measure the resistance of the (D508) COM-Lin Tire Pressure Monitor LAN circuit between the WIN Module harness connector and the Rain Sensor harness connector.

Is the resistance below 2.0 Ohms?

Yes

- Replace and program the Wireless Ignition Node (WIN) in accordance with the Service Information. Wireless Ignition Node Receiver - Removal.
- Perform the WIN VERIFICATION TEST. Wireless Ignition Node (WIN) Verification Test.

No

- Repair the (D508) COM-Lin Tire Pressure Monitor LAN circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test.