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Home › Ford › 2007 › Mustang Base, 2D Convertible, Standard › Repair and Diagnosis › Accessories & Equipment › Communication Devices › Module Communications Network System › Diagnostic Tests › Communications Network › Inspection and Verification

Inspection and Verification

  1. Verify the customer concern.
  2. Visually inspect the following for obvious signs of electrical damage.
    VISUAL INSPECTION CHART

    Electrical
    • Bussed electrical center (BEC) fuse(s):
      • 42 (15A) (no communication with powertrain control module [PCM])
      • 44 (10A) (no communication with smart junction box [SJB])
      • 45 (10A) (no communication with PCM)
      • 56 (20A) (no communication with audio unit, satellite radio receiver)
      • 59 (30A) (no communication with SJB)
      • 62 (20A) (no communication with SJB)
      • 63 (30A) (no communication with SJB)
      • 65 (30A) (no communication with anti-lock brake system [ABS] module)
      • 67 (30A) (no communication with SJB)
    • Smart junction box (SJB) fuse(s):
      • 6 (5A) (no communication with audio unit)
      • 8 (10A) (no communication with instrument cluster, no power to scan tool)
      • 16 (5A) (no communication with instrument cluster)
      • 17 (10A) (no communication with restraints control module [RCM])
      • 18 (10A) (no communication with ABS)
      • 19 (5A) (no communication with instrument cluster, PCM)
    • Data link connector (DLC)
    • Wiring harness
    • Circuitry
  3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
    4. NOTE: Make sure to use the latest scan tool software release.
    NOTE: The vehicle communication module (VCM) LED prove-out confirms power and ground from the DLC are provided to the VCM.
  4. If the cause is not visually evident, connect the scan tool to the DLC.

    If the scan tool does not communicate with the VCM: 

    • Check the VCM connection to the vehicle.
    • Check the scan tool connection to the VCM.
    • Go to Pinpoint Test K , to diagnose no power to the scan tool.
    5. NOTE: During the network test, the scan tool will first attempt to communicate with the PCM, after establishing communication with the PCM, the scan tool will then attempt to communicate with all other modules on the vehicle.
  5. Carry out the network test.
    • If the network test passes, retrieve and record the continuous memory DTCs and proceed to Step 6.
    • If the network test fails, go to Symptom Chart  to identify the module not communicating.
  6. If the DTCs retrieved are related to the concern, go to the Communication Network Diagnostic Trouble Code (DTC) Index. For all other DTCs, refer to MULTIFUNCTION ELECTRONIC MODULES .
  7. If no DTCs related to the concern are retrieved, go to Symptom Chart .
NOTE: DTC U1900 will set in a module that is reporting a communication fault from another module on the data bus. The module that reports the fault is not the problem module.
COMMUNICATION NETWORK DIAGNOSTIC TROUBLE CODES (DTC) INDEX

DTC Description Source Action
U0073 Control Module Communication Bus Off Anti-lock brake system (ABS) module DTC U0073 indicates the module could not communicate on the network at a point in time. The fault is currently not present. CLEAR the DTC. REPEAT the network test with the scan tool.
U0073 Control Module Communication Bus Off Instrument cluster DTC U0073 indicates the module could not communicate on the network at a point in time. The fault is currently not present. CLEAR the DTC. REPEAT the network test with the scan tool.
U0073 Control Module Communication Bus Off Smart junction box (SJB) DTC U0073 indicates the module could not communicate on the network at a point in time. The fault is currently not present. CLEAR the DTC. REPEAT the network test with the scan tool.
U0140 Lost Communication With Body Control Module (GEM) Audio control module CLEAR the DTC. If the SJB failed the network test, go to Pinpoint Test D . Otherwise, DISREGARD the DTC.
U0155 Lost Communication With Instrument Panel Cluster (IC) Control Module Audio control module If the instrument cluster failed the network test, go to Pinpoint Test C . Otherwise, REFER to INSTRUMENT CLUSTER .
U0159 Lost Communication With Parking Assist Control Module (PAM) Audio control module DISREGARD this DTC.
U0184 Lost Communication With Radio Satellite digital audio receiver system (SDARS) If the audio unit fails the network test, go to Pinpoint Test E . Otherwise, REFER to INFORMATION AND ENTERTAINMENT SYSTEMS .
U0193 Lost Communication With Digital Audio Control Module (SDARS) Audio control module If the SDARS fails the network test, go to Pinpoint Test F .
U0196 Lost Communication With Entertainment Control Module - Rear (AUX) Audio control module REFER to INFORMATION AND ENTERTAINMENT SYSTEMS .
U0196 Lost Communication With Entertainment Control Module - Rear (AUX) SDARS REFER to INFORMATION AND ENTERTAINMENT SYSTEMS .
U0197 Lost Communication With Telephone Control Module Audio control module REFER to INFORMATION AND ENTERTAINMENT SYSTEMS .
U0197 Lost Communication With Telephone Control Module SDARS REFER to INFORMATION AND ENTERTAINMENT SYSTEMS .
U0238 Lost Communication With Digital Audio Control Module "D" Audio control module REFER to INFORMATION AND ENTERTAINMENT SYSTEMS .
U0249 Lost Communication With Entertainment Control Module - Rear "B" Audio control module REFER to INFORMATION AND ENTERTAINMENT SYSTEMS .
U0249 Lost Communication With Entertainment Control Module - Rear "B" SDARS REFER to INFORMATION AND ENTERTAINMENT SYSTEMS .
U1900 CAN Communication Bus Fault-Receive Error ABS module Go to Symptom Chart  for module that failed network test.
U1900 CAN Communication Bus Fault-Receive Error Audio unit Go to Symptom Chart  for module that failed network test.
U1900 CAN Communication Bus Fault-Receive Error Instrument cluster Go to Symptom Chart  for module that failed network test.
U1900 CAN Communication Bus Fault-Receive Error SJB Go to Symptom Chart  for module that failed network test.
U2011 Module Transmitted Invalid Data (Non SCP) ABS module RETRIEVE AND FOLLOW non-network DTCs from module with non-network fault code present. REFER to MULTIFUNCTION ELECTRONIC MODULES .
U2023 Fault Received From External Node Instrument cluster RETRIEVE AND FOLLOW non-network DTCs from module with non-network fault code present. REFER to MULTIFUNCTION ELECTRONIC MODULES .
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