Diagnostic Test

TEST FOR INTERMITTENT CONDITION
1. Turn the ignition on.
2. With the scan tool, record and erase MSM DTC's
3. Cycle the ignition from on to off 3 times.
4. Turn the ignition on.
5. With the scan tool, read active MSM DTC's.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go to step 2
  No
  - The conditions that caused this code to set are not present at this time. Using the SYSTEM WIRING DIAGRAMS as a guide, inspect the wiring and connectors.
  - Perform BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .
(D54) CAN B BUS (-) CIRCUIT OPEN

Fig 1: Checking CAN B BUS (-) Circuit Open
Courtesy of CHRYSLER LLC
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 in accordance with the service information.
  - Perform POWER SEAT SYSTEM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Memory Seat (MSMD) - Standard Procedure .
  No
  - Repair the (D54) CAN B Bus (-) circuit for an open.
  - Perform BODY VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Front Control (FCM) - Standard Procedure .