Pinpoint Test F: Most Network Final Upstream Tests

F1: MOST NETWORK FINAL UPSTREAM TEST 1 

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

Is red light present? 

YES:  The fault is in the MOST harness between the touch screen display and the succeeding control module. Install a new MOST harness as necessary

NO:  GO to F2  .

F2: MOST NETWORK FINAL UPSTREAM TEST 2 

1. Direct the MOST harness connector at a suitable surface and check for the presence of red light

Is red light present? 

YES:  GO to F3  .

NO:  GO to F4  .

F3: MOST NETWORK FINAL UPSTREAM TEST 3 

1. Reconnect the MOST harness connector to the touch screen display
2. Set the ignition switch to 'off'
3. Set the ignition switch to 'on'

Has the touch screen display operation been restored? 

YES:  Tests inconclusive. Repeat the tests from the beginning. GO to Pinpoint Test B .

NO:  Install a new touch screen display

F4: MOST NETWORK FINAL UPSTREAM TEST 4 

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

Is red light present? 

YES:  The fault is in the MOST harness between the audio head unit and the touch screen display. Install a new MOST harness as necessary

NO:  GO to Pinpoint Test H .