U1107

U1107-ECU IN SINGLE WIRE MODE





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

- When Monitored:
Continuously

- Set Condition:
This code sets if the (D55) Can B Bus (+) circuit or the (D54) Can B Bus (-) circuit is open.





1. VERIFY DTC U1107-ECU IN SINGLE WIRE MODE IS ACTIVE
1. Turn the ignition on.
2. With the scan tool, record and erase DTCs.
3. Cycle the ignition three times ending with the ignition on.
4. With the scan tool, read DTCs.

Is DTC U1107-ECU IN SINGLE WIRE MODE active?

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. Look for chafed, pierced, pinched, or partially broken wires and broken, bent, pushed out, spread, corroded, or contaminated terminals.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

2. CHECK FOR CAN B BUS RELATED DTCs IN FCM
1. With the scan tool, read FCM DTCs.

Are there any CAN B BUS related DTCs set in the FCM?

Yes

- Perform the appropriate diagnostic procedure. Testing and Inspection.

No

- Go To 3

3. CHECK (D55) CAN B BUS (+) CIRCUIT FOR AN OPEN




1. Turn the ignition off.
2. Disconnect the HSM connector.
3. Disconnect the FCM C1 connector.
4. Measure the resistance of the (D55) Can B Bus (+) circuit between the FCM C1 connector and the HSM connector.

Is the resistance below 2.0 Ohms?

Yes

- Go To 4

No

- Repair the (D55) Can B Bus (+) circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

4. CHECK (D54) CAN B BUS (-) CIRCUIT FOR AN OPEN




1. Measure the resistance of the (D54) Can B Bus (-) circuit between the FCM C1 connector and the HSM connector.

Is the resistance below 2.0 Ohms?

Yes

- Replace the Heated Seat Module (HSM).
- 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.