Heated Seat Module (HSM)

U0019-CAN B BUS





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 shorted to Voltage or shorted to ground.





1. VERIFY DIAGNOSTIC TROUBLE CODE (DTC) U0019-CAN B BUS 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 U0019-CAN B BUS active?

Yes

- Go To 2

No

- The conditions that caused this code to set are not present at this time. Verify seat harness is routed correctly. 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. Attempt to reproduce condition by adjusting the seat.

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 A SHORT TO VOLTAGE




1. Turn the ignition off.
2. Disconnect the HSM connector.
3. Disconnect the TIPM C5 connector.

NOTE: Check connectors. Clean and repair as necessary.

4. Turn the ignition on.
5. Measure the Voltage of the (D55) CAN B Bus (+) circuit between the HSM connector and ground.

Is the Voltage above 10.0 Volts?

Yes

- Repair the (D55) CAN B Bus (+) circuit for a short to Voltage.
- Perform BODY VERIFICATION TEST Body Verification Test.

No

- Go To 4

4. CHECK (D54) CAN B BUS (-) CIRCUIT FOR A SHORT TO VOLTAGE




1. Measure the Voltage of the (D54) CAN B Bus (-) circuit between the HSM connector and ground.

Is the voltage above 10.0 Volts?

Yes

- Repair the (D54) CAN B Bus (-) circuit for a short to Voltage.
- Perform BODY VERIFICATION TEST Body Verification Test.

No

- Go To 5

5. CHECK (D55) CAN B BUS (+) CIRCUIT FOR A SHORT TO GROUND




1. Turn the ignition off.
2. Measure the resistance of the (D55) CAN B Bus (+) circuit between ground and the HSM connector.

Is the resistance below 1000.0 ohms?

Yes

- Repair the (D55) CAN B Bus (+) circuit for a short to ground.
- Perform BODY VERIFICATION TEST Body Verification Test.

No

- Go To 6

6. CHECK (D54) CAN B BUS (-) CIRCUIT FOR A SHORT TO GROUND




1. Measure the resistance of the (D54) CAN B Bus (-) circuit between ground and the HSM connector.

Is the resistance below 1000.0 ohms?

Yes

- Repair the (D54) CAN B Bus (-) circuit for a short to ground.
- Perform BODY VERIFICATION TEST Body Verification Test.

No

- Replace the Heated Seat Module (HSM).
- Perform BODY VERIFICATION TEST Body Verification Test.