Heated Seat Module (HSM)

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 DIAGNOSTIC TROUBLE CODE (DTC) U1107-ECU IN SINGLE WIRE MODE IS ACTIVE
1. Turn the ignition on.
2. Using a scan tool, record and erase DTCs.
3. Cycle the ignition three times ending with the ignition on.
4. Using a 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.
- Perform the BODY VERIFICATION TEST Body Verification Test.

2. CHECK FOR CAN B BUS RELATED DTCs IN TIPM
1. Using a scan tool, read TIPM DTCs.

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

Yes

- Perform the appropriate test. 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 TIPM C5 connector.
4. Measure the resistance of the (D55) CAN B Bus (+) circuit between the TIPM C5 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 TIPM C5 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.