Cabin Compartment Node (CCN)
U0019-CAN B BUS
For a complete wiring diagram, refer to the Wiring Information Electrical Diagrams.
- When Monitored:
With the Instrument Cluster awake.
- Set Condition:
Whenever the Can B Bus (+) or B Bus (-) circuit is open, shorted to voltage or shorted to ground, this code will set.
1. CHECK FOR AN ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, record and erase DTCs.
3. Cycle the ignition from on to off 3 times.
4. Turn the ignition on.
5. With the scan tool, read DTCs.
Is the DTC 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 chafed, 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 FRONT CONTROL MODULE DTCs
1. With the scan tool, read Front Control Module DTCs.
Does the scan tool display the U0019-CAN B BUS DTC?
Yes
- Diagnose and Repair the DTC's. . Communications - Verbose Codes
No
- Go To 3
3. (D55) CAN B BUS (+) CIRCUIT OPEN
1. Turn the ignition off.
2. Disconnect the negative battery cable.
3. Disconnect the Instrument Cluster C3 harness connector.
4. Disconnect the Front Control Module C1 harness connector.
5. Measure the resistance of the (D55) Can B Bus (+) circuit between the Front Control Module C1 harness connector and the Instrument Cluster C3 harness connector.
Is the resistance below 2.0 ohms?
Yes
- Go To 4
No
- Repair the Can B Bus (+) circuit for an open.
- Perform the BODY VERIFICATION TEST Body Verification Test.
4. (D54) CAN B BUS (-) CIRCUIT OPEN
1. Measure the resistance of the (D54) Can B Bus (-) circuit between the Front Control Module C1 harness connector and the Instrument Cluster C3 harness connector.
Is the resistance below 2.0 ohms?
Yes
- Replace the Instrument Cluster.
- 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.