U1107

U1107-ECU IN SINGLE-WIRE MODE





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

- When Monitored:
Continuously.

- Set Condition:
This code will set if either the Can B Bus (+) or (-) circuits are open.





1. TEST FOR INTERMITTENT CONDITION
1. Turn the ignition on.
2. With the scan tool, record and erase DTCs
3. Cycle the ignition from on to off three times.
4. Turn the ignition on.
5. With the scan tool, read DTCs.

Does the scan tool display U1107 ECU IN SINGLE-WIRE MODE?

Yes

- Go To 2

No

- The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
- Perform the BODY VERIFICATION TEST Body Verification Test.

2. CHECK FRONT CONTROL MODULE DTCs
1. With the scan tool, read Front Control Module DTC's

Does the scan tool display any CAN B BUS DTCs - ACTIVE?

Yes

- Refer to the appropriate diagnostic procedure, Testing and Inspection.

No

- Go to 3

3. CAN B BUS (+) CIRCUIT OPEN




1. Turn the ignition off.
2. Disconnect the Heated Seat Module connector.
3. Disconnect the Front Control Module C1 connector.
4. Measure the resistance of the (D55) Can B Bus (+) circuit between the Front Control Module C1 connector and the Heated Seat Module 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. CAN B BUS (-) CIRCUIT OPEN




1. Measure the resistance of the (D54) Can B Bus (-) circuit between the Front Control Module C1 connector and the Heated Seat Module connector.

Is the resistance below 2.0 ohms?

Yes

- Replace the Heated Seat 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.