Power Seats

U0020-CAN B BUS OFF PERFORMANCE





For a complete wiring diagram Refer to Diagrams/Electrical.

- When Monitored:

Continuously.

- Set Condition:

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





Diagnostic Test

1.TEST FOR INTERMITTENT CONDITION

Turn the ignition on.

With the scan tool, record and erase MSM DTC's

Cycle the ignition from on to off three times.

Turn the ignition on.

With the scan tool, read active MSM DTC's.

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.

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





Turn the ignition off.

Disconnect the Memory Seat Module C1 harness connector.

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 POWER SEAT SYSTEM VERIFICATION TEST - VER 1. Power Seat System Verification Test

No

- Repair the (D55) CAN B Bus (+) circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test

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





Turn the ignition off.

Disconnect the Memory Seat Module C1 harness connector.

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 POWER SEAT SYSTEM VERIFICATION TEST - VER 1. Power Seat System Verification Test

No

- Repair the (D54) CAN B Bus (-) circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test