Memory Seat Module (MSMD)

U0020-CAN B BUS OFF PERFORMANCE





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

- When Monitored:
Continuously.

- Set Condition:
The Memory Seat Module detects the (D55) CAN B Bus (+) circuit or (D54) CAN B Bus (-) circuit open.





1. TEST FOR INTERMITTENT CONDITION
1. Turn the ignition on.
2. Using the scan tool, record and erase the 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 the 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 POWER SEAT SYSTEM VERIFICATION TEST. Power Seat System Verification Test.

2. (D55) CAN B BUS (+) CIRCUIT OPEN




1. Turn the ignition off.
2. Disconnect the Memory Seat Module C1 harness connector.
3. Measure the voltage between the (D55) CAN B Bus (+) circuit and ground.

Is there any voltage present?

Yes

- Inspect the wiring and connectors for damage or shorted circuits. If OK, replace the Memory Seat Module.
- Perform the POWER SEAT SYSTEM VERIFICATION TEST. Power Seat System Verification Test.

No

- Repair the (D55) CAN B Bus (+) circuit for an open.
- Perform the POWER SEAT SYSTEM VERIFICATION TEST. Power Seat System Verification Test.

3. (D54) CAN B BUS (-) CIRCUIT OPEN




1. Turn the ignition off.
2. Disconnect the Memory Seat Module C1 harness connector.
3. Measure the voltage between the (D54) CAN B Bus (-) circuit and ground.

Is there any voltage present?

Yes

- Inspect the wiring and connectors for damage or shorted circuits. If OK, replace the Memory Seat Module.
- Perform the POWER SEAT SYSTEM VERIFICATION TEST. Power Seat System Verification Test.

No

- Repair the (D54) CAN B Bus (-) circuit for an open.
- Perform the POWER SEAT SYSTEM VERIFICATION TEST. Power Seat System Verification Test.