Audio System Symptom Troubleshooting - Audio system information does not display on the multi-information display unit(With Normal Audio)

Audio system information does not display on the multi-information display unit 

NOTE: 

• Check the vehicle 12 volt battery condition first .
• Check the connectors for poor connections or loose terminals.

• 1. Determine possible failure area (audio system, others):

  - 1. Turn the vehicle to the ON mode.

  - 2. Check if any MID information appears on the multi-information display unit.

  Is there any information displayed?

  YES 

  Go to step 2.

  NO 

  Refer to Audio System Symptom Troubleshooting - Multi-information display unit does not work  .

• 2. Problem verification:

  - 1. Check if audio information appears on the multi-information display unit.

  Does the audio information display properly?

  YES 

  Intermittent failure, the system is OK at this time.

  NO 

  The failure is duplicated, go to step 3.

• 3. Determine possible failure area (DUET CONT line, others):

  - 1. Turn the vehicle to the OFF (LOCK) mode.

  - 2. Disconnect the following connector.

  Multi-information display unit connector A (32P)

  - 3. Turn the vehicle to the ON mode.

  - 4. Measure the voltage between test points 1 and 2.

  Test condition	Vehicle ON mode
  	Multi-information display unit connector A (32P): disconnected
  Test point 1	Multi-information display unit connector A (32P) No. 30
  Test point 2	Body ground

  Is there battery voltage?

  YES 

  The DUET CONT wire is OK. Go to step 4.

  NO 

  Go to step 9.

• 4. Shorted wire check (DUET TX line, DUET RX line):

  - 1. Turn the vehicle to the OFF (LOCK) mode.

  - 2. Disconnect the following connector.

  Audio unit connector B (20P)

  - 3. Check for continuity between test points 1 and 2.

  Test condition	Vehicle OFF (LOCK) mode
  	Multi-information display unit connector A (32P): disconnected
  	Audio unit connector B (20P): disconnected
  Test point 1	Audio unit connector B (20P) No. 5 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio) Audio Unit Connector for Inputs and Outputs(With Normal Audio)
  Test point 2	Body ground

  Test point 1	Audio unit connector B (20P) No. 4 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio) Audio Unit Connector for Inputs and Outputs(With Normal Audio)
  Test point 2	Body ground

  Is there continuity?

  YES 

  There is a short to body ground in the wire(s) between the audio unit and the multi-information display unit. Replace the affected shielded harness.

  NO 

  The DUET TX and the DUET RX wires are not shorted to ground. Go to step 5.

• 5. Shorted wire check (DUET TX line to DUET RX line):

  - 1. Check for continuity between test points 1 and 2.

  Test condition	Vehicle OFF (LOCK) mode
  	Multi-information display unit connector A (32P): disconnected
  	Audio unit connector B (20P): disconnected
  Test point 1	Audio unit connector B (20P) No. 5 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio) Audio Unit Connector for Inputs and Outputs(With Normal Audio)
  Test point 2	Audio unit connector B (20P) No. 4 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio) Audio Unit Connector for Inputs and Outputs(With Normal Audio)

  Is there continuity?

  YES 

  There is a short in the wires between the audio unit and the multi-information display unit. Replace the affected shielded harness.

  NO 

  The DUET TX and the DUET RX wires are not shorted. Go to step 6.

• 6. Shorted wire check (SH DUET line to another lines):

  - 1. Check for continuity between test points 1 and 2.

  Test condition	Vehicle OFF (LOCK) mode
  	Multi-information display unit connector A (32P): disconnected
  	Audio unit connector B (20P): disconnected
  Test point 1	Audio unit connector B (20P) No. 15 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio) Audio Unit Connector for Inputs and Outputs(With Normal Audio)
  Test point 2	Audio unit connector B (20P) No. 5 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio) Audio Unit Connector for Inputs and Outputs(With Normal Audio)

  Test point 1	Audio unit connector B (20P) No. 15 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio) Audio Unit Connector for Inputs and Outputs(With Normal Audio)
  Test point 2	Audio unit connector B (20P) No. 4 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio) Audio Unit Connector for Inputs and Outputs(With Normal Audio)

  Is there continuity?

  YES 

  There is a short in the wires between the audio unit and the multi-information display unit. Replace the affected shielded harness.

  NO 

  The SH DUET wire is OK. Go to step 7.

• 7. Open wire check (DUET TX line, DUET RX line):

  - 1. Check for continuity between test points 1 and 2.

  Test condition	Vehicle OFF (LOCK) mode
  	Multi-information display unit connector A (32P): disconnected
  	Audio unit connector B (20P): disconnected
  Test point 1	Audio unit connector B (20P) No. 5 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio) Audio Unit Connector for Inputs and Outputs(With Normal Audio)
  Test point 2	Multi-information display unit connector A (32P) No. 29

  Test point 1	Audio unit connector B (20P) No. 4 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio) Audio Unit Connector for Inputs and Outputs(With Normal Audio)
  Test point 2	Multi-information display unit connector A (32P) No. 13

  Is there continuity?

  YES 

  The DUET TX and the DUET RX wires are OK. Go to step 8.

  NO 

  There is an open in the wire(s) between the audio unit and the multi-information display unit. Replace affected shielded harness.

• 8. Multi-information display unit check (substitution):

  - 1. Substitute a known-good multi-information display unit .

  - 2. Reconnect all the connectors, and recheck.

  Does the symptom go away?

  YES 

  Replace the original multi-information display unit .

  NO 

  Replace the audio unit - Refer to: Audio Unit Removal and Installation(With Display Audio)Audio Unit Removal and Installation(With Normal Audio) .

• 9. Open wire check (DUET CONT line):

  - 1. Measure the voltage between test points 1 and 2.

  Test condition	Vehicle ON mode
  	Multi-information display unit connector A (32P): disconnected
  Test point 1	Audio unit connector B (20P) No. 14 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio) Audio Unit Connector for Inputs and Outputs(With Normal Audio)
  Test point 2	Body ground

  Is there battery voltage?

  YES 

  Repair an open in the wire between the audio unit and the multi-information display unit.

  NO 

  The DUET CONT wire is not open. Go to step 10.

• 10. Shorted wire check (DUET CONT line):

  - 1. Turn the vehicle to the OFF (LOCK) mode.

  - 2. Disconnect the following connector.

  Audio unit connector B (20P)

  - 3. Check for continuity between test points 1 and 2.

  Test condition	Vehicle OFF (LOCK) mode
  	Multi-information display unit connector A (32P): disconnected
  	Audio unit connector B (20P): disconnected
  Test point 1	Audio unit connector B (20P) No. 14 - Refer to: Audio Unit Connector for Inputs and Outputs(With Display Audio) Audio Unit Connector for Inputs and Outputs(With Normal Audio)
  Test point 2	Body ground

  Is there continuity?

  YES 

  Repair a short to body ground in the wire between the audio unit and the multi-information display unit.

  NO 

  Replace the audio unit - Refer to: Audio Unit Removal and Installation(With Display Audio)Audio Unit Removal and Installation(With Normal Audio) .