Heated Seat Module (HSM)

U0019-CAN B BUS







- When Monitored:
Continuously.

- Set Condition:
Whenever the Can B Bus (+) or B Bus (-) circuit is open, shorted to voltage or shorted to ground, this code will set.





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

Does the scan tool display this DTC as 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 TIPM DTCS
1. Using the scan tool, read TIPM DTCs

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

Yes

- Go To and perform 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 harness connector.
3. Disconnect the TIPM C5 harness connector.
4. Measure the resistance of the (D55) Can B Bus (+) circuit between the TIPM C5 harness connector and the Heated Seat Module harness 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 TIPM C5 harness connector and the Heated Seat Module harness 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.