Memory Seat Module (MSMD)

U0019-CAN B BUS





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

- When Monitored:
Continuously

- Set Condition:
If the CAN B Bus (+) circuit or the CAN B Bus (-) circuit is open, shorted to voltage, shorted to ground, or shorted together.





1. TEST FOR INTERMITTENT CONDITION
1. Turn the ignition on.
2. Using a scan tool, read Memory Seat Module (MSM) DTCs.

Does the scan tool display active: U0019-CAN B BUS?

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.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

2. CHECK FOR ACTIVE CAN B BUS DTCs IN THE FRONT CONTROL MODULE (FCM)
1. Using a scan tool, read Front Control Module (FCM) DTCs.

Does the scan tool display any active CAN B BUS DTCs?

Yes

- Testing and Inspection Perform the appropriate diagnostic procedure.

No

- Go To 3

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




1. Turn the ignition off.
2. Disconnect the Memory Seat Module C1 connector.
3. Disconnect the Front Control Module C1 connector.
4. Measure the resistance of the (D54) CAN B Bus (-) circuit between the Front Control Module C1 connector and the Memory Seat Module C1 connector.

Is the resistance below 2.0 Ohms?

Yes

- Go To 4

No

- Repair the (D54) CAN B Bus (-) circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

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




1. Measure the resistance of the (D55) CAN B Bus (+) circuit between the Front Control Module C1 connector and the Memory Seat Module C1 connector.

Is the resistance below 2.0 Ohms?

Yes

- Replace the Memory Seat Module (MSM).
- Perform POWER SEAT SYSTEM VERIFICATION TEST. Power Seat System Verification Test.

No

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