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Pinpoint Test D: Most Network Upstream Tests

D1: MOST NETWORK UPSTREAM TEST 1 

  1. Refer to the electrical circuit diagrams and identify the preceding control module on the MOST network

    2. Is this control module the touch screen display? 

    YES:  GO to Pinpoint Test F .

    NO:  GO to D2  .

D2: MOST NETWORK UPSTREAM TEST 2 

  1. Disconnect the MOST harness connector from the control module
  2. Direct the MOST harness connector at a suitable surface and check for the presence of red light

    3. Is red light present? 

    YES:  The MOST network fault is in the control module or the MOST harness to the succeeding control module. GO to D3  .

    NO:  The MOST network fault is located upstream of the disconnected control module. Reconnect the MOST harness connector to the control module. GO to D1  .

D3: MOST NETWORK UPSTREAM TEST 3 

NOTE: When connecting the MOST tester, use the 2+0 or 2+4 socket as appropriate and set the connector selector switch to match the socket in use
  1. Connect the MOST harness connector to the MOST tester
  2. Check the touch screen display for indication of a MOST network fault

    3. Has the MOST network been restored? 

    YES:  The disconnected control module is causing the MOST network fault. GO to Pinpoint Test E .

    NO:  The fault is in the MOST harness between the MOST tester and the succeeding control module. Install a new MOST harness as necessary

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