Diagnostic Test

WARNING: This page is about a different car, the 2010 Dodge Charger and 2010 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.

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 step 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. See DTC-Based Diagnostics/MODULE, Memory Seat (MSMD) - Standard Procedure .
(D55) CAN B BUS (+) CIRCUIT OPEN

Fig 1: Checking CAN B BUS (+) Circuit For 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 (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 in accordance with the Service Information.
  - Perform the POWER SEAT SYSTEM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Memory Seat (MSMD) - Standard Procedure .
  No
  - Repair the (D55) CAN B Bus (+) circuit for an open.
  - Perform the POWER SEAT SYSTEM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Memory Seat (MSMD) - Standard Procedure .
(D54) CAN B BUS (-) CIRCUIT OPEN

Fig 2: Checking CAN B BUS (-) Circuit For 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 the 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 the POWER SEAT SYSTEM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Memory Seat (MSMD) - Standard Procedure .