U1105

U1105-CAN B SIGNAL MISSING







- When Monitored:
Continuously

- Set Condition:
When the CAN B Bus messages are not received within two seconds.





1. CHECK FOR ACTIVE DIAGNOSTIC TROUBLE CODE (DTC)S

NOTE: Check for any Technical Service Bulletins (TSBs) related to the condition. If a TSB applies, perform the procedure outlined in the TSB before continuing.

1. Using the scan tool, read the active DTCs.
2. Cycle the ignition switch from off to on at least 5 times, leaving the ignition on for a minimum of 90 seconds per cycle.
3. Using the scan tool, read the active DTCs.

Does the scan tool display this DTC as active?

Yes

- Go To 2

No

- If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out or corroded terminals.

2. CHECK MODULE FOR U0019 DTC
1. Using the scan tool, read the active DTCs on the module that set the U1105 DTC.

Does the scan tool display U0019 CAN B BUS - ACTIVE?

Yes

- Go To and perform the U0019 diagnostic procedure U0019.

No

- Go To 3

3. (D55) CAN B BUS (+) CIRCUIT OPEN




1. Turn the ignition off.
2. Disconnect the TIPM C3 harness connector.
3. Turn the ignition on.
4. Measure the voltage of the (D55) CAN B Bus (+) circuit.

Is any voltage present on this circuit?

Yes

- Go To 4

No

- Repair the (D55) 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 voltage of the (D54) CAN B Bus (-) circuit.

Is any voltage present on this circuit?

Yes

- Replace the module that set this DTC.
- Perform the appropriate verification test for the module being replaced. If there is no verification test for the associated module perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Repair the (D54) CAN B Bus (-) circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test.