Light Rain Sensor Module (LRSM)

U0019-CAN B BUS



- When Monitored:
With the ignition on.

- Set Condition:
If the Can B Bus (+) or B Bus (-) circuit is open, shorted to voltage, or shorted to ground.





1. CHECK FOR ACTIVE DIAGNOSTIC TROUBLE CODE (DTC) U0019-CAN B BUS
1. Turn the ignition on.
2. With the scan tool, record and erase any Rain Sensor Module DTCs.
3. Turn the ignition off, wait 30 seconds then turn the ignition on.
4. With the scan tool, read DTCs.

Is DTC U0019-CAN B BUS active?

Yes

- Go To 2

No

- The condition that caused this code to set is not present at this time. Check for an intermittent condition by inspecting the related wiring harness for chaffed, pierced, pinched, and partially broken wires. Also inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.
- Perform the BODY VERIFICATION TEST. Body Verification Test

2. CHECK FOR ACTIVE CAN B BUS RELATED DTCS IN THE FRONT CONTROL MODULE
1. With the scan tool, read Totally Integrated Power Module (TIPM) DTCs

Does the scan tool display any active CAN B BUS related DTCs?

Yes

- Diagnose and repair the DTCs.

No

- Go to 3

3. CHECK (D55) CAN B BUS (+) CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Disconnect the negative battery cable.
3. Disconnect the Rain Sensor Module harness connector.
4. Disconnect the Totally Integrated Power Module (TIPM) C1 harness connector.
5. Measure the resistance of the (D55) Can B Bus (+) circuit between the Totally Integrated Power Module (TIPM) C1 harness connector and the Rain Sensor Module harness connector.

Is the resistance below 5.0 ohms?

Yes

- Go To 4

No

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

4. CHECK THE (D54) CAN B BUS (-) CIRCUIT FOR AN OPEN
1. Measure the resistance of the (D54) Can B Bus (-) circuit between the Totally Integrated Power Module (TIPM) C1 harness connector and the Rain Sensor Module harness connector.

Is the resistance below 5.0 ohms?

Yes

- Replace the Rain Sensor Module.
- Perform the BODY VERIFICATION TEST. Body Verification Test

No

- Repair the Can B Bus (-) circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test