Pinpoint Test H: Audio Head Unit Tests

H1: AUDIO HEAD UNIT TEST 1 

1. Using the manufacturer approved diagnostic system, check the audio head unit for related DTCs

Is communication possible between the manufacturer approved diagnostic system and the audio head unit? 

YES:  Refer to the relevant DTC index

NO:  GO to H2  .

H2: AUDIO HEAD UNIT TEST 2 

1. Refer to the electrical circuit diagrams and test the audio head unit power and ground circuits for open circuit, high resistance

Are the power and ground circuits within specification? 

YES:  GO to H3  .

NO:  Repair the power and/or ground circuit

H3: AUDIO HEAD UNIT TEST 3 

1. Using the manufacturer approved diagnostic system, perform a CAN network integrity test. Refer to the electrical circuit diagrams and test the medium speed CAN bus circuit for short circuit to ground, short circuit to power, open circuit, high resistance

Is the medium speed CAN bus within specification? 

YES:  Install a new audio head unit

NO:  Repair the medium speed CAN bus circuit