DTC 1406: Audio Error 6 (Radio Error) (Display Audio) (2016-17)

NOTE: 

• Check the vehicle battery condition first .
• This audio DTC sets when Connection NG is indicated in the tuner unit diagnosis (the Remote Tuner icon is red in the System Links).
• Before you troubleshoot, make sure to follow the General Troubleshooting Information - Refer to: How to Troubleshoot the Audio System, or Audio System Self-Diagnostic Function (Without Navigation, Without Touch Screen), or Audio System Self-Diagnostic Function (Without Navigation, With Touch Screen), or How to Troubleshoot the Audio System (Display Audio) (2016-17) .

1. Problem verification

   -1. Clear the hard error codes.

   - 2. Turn the vehicle to the OFF (LOCK) mode, then the ON mode.

   - 3. Check for hard error codes.

   Is DTC 2612 indicated with DTC 1406?

   YES 

   The failure is duplicated, go to step 2.

   NO: Only DTC 1406 is indicated

   The failure is duplicated, go to step 7. Refer to:  7

   NO: DTC is not indicated

   Intermittent failure, the system is OK at this time.

2. Determine possible failure area (related unit, others)

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

   - 2. Disconnect the following connector.

   Multi-information display unit connector A (12P)

   - 3. Clear the hard error codes.

   - 4. Turn the vehicle to the ON mode.

   - 5. Go into the System Diagnostic Mode, and select the Error History icon from the System Links.

   Is DTC 1406 indicated?

   YES 

   Go to step 3.

   NO 

   Replace the multi-information display unit .

3. Shorted wire check (GA BUS+ line, GA BUS- line)

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

   - 2. Disconnect the following connectors.

   Audio unit connector D (12P)

   Tuner unit connector A (12P)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Audio unit connector D (12P): disconnected
   	Multi-information display unit connector A (12P): disconnected
   	Tuner unit connector A (12P): disconnected
   Test point 1	Tuner unit connector A (12P) No. 7 - Refer to: Tuner Unit Connector for Inputs and Outputs, or Tuner Unit Connector for Inputs and Outputs (Display Audio) (2016-17)
   Test point 2	Body ground

   Test point 1	Tuner unit connector A (12P) No. 1 - Refer to: Tuner Unit Connector for Inputs and Outputs, or Tuner Unit Connector for Inputs and Outputs (Display Audio) (2016-17)
   Test point 2	Body ground

   Is there continuity?

   YES 

   There is a short to body ground in the GA BUS wire (s). Replace the affected shielded harness.

   NO 

   The GA BUS+ and the GA BUS- wires are not shorted to ground. Go to step 4.

4. Shorted wire check (GA BUS+ line to GA BUS- line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Audio unit connector D (12P): disconnected
   	Multi-information display unit connector A (12P): disconnected
   	Tuner unit connector A (12P): disconnected
   Test point 1	Tuner unit connector A (12P) No. 7 - Refer to: Tuner Unit Connector for Inputs and Outputs, or Tuner Unit Connector for Inputs and Outputs (Display Audio) (2016-17)
   Test point 2	Tuner unit connector A (12P) No. 1 - Refer to: Tuner Unit Connector for Inputs and Outputs, or Tuner Unit Connector for Inputs and Outputs (Display Audio) (2016-17)

   Is there continuity?

   YES 

   There is a short in the GA BUS wires. Replace the affected shielded harness.

   NO 

   The GA BUS+ and the GA BUS- wires are not shorted. Go to step 5.

5. Shorted wire check (SH GA BUS line to another lines)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Audio unit connector D (12P): disconnected
   	Multi-information display unit connector A (12P): disconnected
   	Tuner unit connector A (12P): disconnected
   Test point 1	Tuner unit connector A (12P) No. 2 - Refer to: Tuner Unit Connector for Inputs and Outputs, or Tuner Unit Connector for Inputs and Outputs (Display Audio) (2016-17)
   Test point 2	Tuner unit connector A (12P) No. 7 - Refer to: Tuner Unit Connector for Inputs and Outputs, or Tuner Unit Connector for Inputs and Outputs (Display Audio) (2016-17)

   Test point 1	Tuner unit connector A (12P) No. 2 - Refer to: Tuner Unit Connector for Inputs and Outputs, or Tuner Unit Connector for Inputs and Outputs (Display Audio) (2016-17)
   Test point 2	Tuner unit connector A (12P) No. 1 - Refer to: Tuner Unit Connector for Inputs and Outputs, or Tuner Unit Connector for Inputs and Outputs (Display Audio) (2016-17)

   Is there continuity?

   YES 

   There is a short in the GA BUS wires. Replace the affected shielded harness.

   NO 

   The SH GA BUS wire is OK. Go to step 6.

6. Open wire check (GA BUS+ line, GA BUS- line)

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

   Test condition	Vehicle OFF (LOCK) mode
   	Audio unit connector D (12P): disconnected
   	Multi-information display unit connector A (12P): disconnected
   	Tuner unit connector A (12P): disconnected
   Test point 1	Audio unit connector D (12P) No. 7 - Refer to: Audio Unit Connector for Inputs and Outputs (Without Touch Screen) (2013), or Audio Unit Connector for Inputs and Outputs (With Touch Screen) (2013), or Audio Unit Connector for Inputs and Outputs (Without Touch Screen) (2014), or Audio Unit Connector for Inputs and Outputs (With Touch Screen) (2014), or Audio Unit Connector for Inputs and Outputs (With Touch Screen) (2015), or Audio Unit Connector for Inputs and Outputs (Without Touch Screen) (2015), or Audio Unit Connector for Inputs and Outputs (Display Audio) (2016-17), or Audio Unit Connector for Inputs and Outputs (Normal Audio) (2016-17)
   Test point 2	Tuner unit connector A (12P) No. 7 - Refer to: Tuner Unit Connector for Inputs and Outputs, or Tuner Unit Connector for Inputs and Outputs (Display Audio) (2016-17)

   Test point 1

   Audio unit connector D (12P) No. 1 - Refer to: Audio Unit Connector for Inputs and Outputs (Without Touch Screen) (2013), or Audio Unit Connector for Inputs and Outputs (With Touch Screen) (2013), or Audio Unit Connector for Inputs and Outputs (Without Touch Screen) (2014), or Audio Unit Connector for Inputs and Outputs (With Touch Screen) (2014), or Audio Unit Connector for Inputs and Outputs (With Touch Screen) (2015), or Audio Unit Connector for Inputs and Outputs (Without Touch Screen) (2015), or Audio Unit Connector for Inputs and Outputs (Display Audio) (2016-17), or Audio Unit Connector for Inputs and Outputs (Normal Audio) (2016-17)

   Test point 2

   Tuner unit connector A (12P) No. 1 - Refer to: Tuner Unit Connector for Inputs and Outputs, or Tuner Unit Connector for Inputs and Outputs (Display Audio) (2016-17)

   Is there continuity?

   YES 

   Replace the tuner unit .

   NO 

   There is an open in the wire (s) between the audio unit and the tuner unit. Replace the affected shielded harness.

7. Determine possible failure area (GA +B line, others)

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

   Test condition	Vehicle ON mode
   Test point 1	Tuner unit connector A (12P) No. 12 - Refer to: Tuner Unit Connector for Inputs and Outputs, or Tuner Unit Connector for Inputs and Outputs (Display Audio) (2016-17)
   Test point 2	Body ground

   Is there battery voltage?

   YES 

   The GA +B wire is OK. Go to step 8.

   NO 

   Go to step 11. Refer to:  11

8. Determine possible failure area (GA GND line, others)

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

   Test condition	Vehicle ON mode
   Test point 1	Tuner unit connector A (12P) No. 6 - Refer to: Tuner Unit Connector for Inputs and Outputs, or Tuner Unit Connector for Inputs and Outputs (Display Audio) (2016-17)
   Test point 2	Body ground

   Is there less than 0.2 V?

   YES 

   The GA GND wire is OK. Go to step 9.

   NO 

   Go to step 13. Refer to:  13

9. Determine possible failure area (GA SYS ON line, others)

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

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

   Test condition	Vehicle OFF (LOCK) mode
   Test point 1	Tuner unit connector A (12P) No. 8 - Refer to: Tuner Unit Connector for Inputs and Outputs, or Tuner Unit Connector for Inputs and Outputs (Display Audio) (2016-17)
   Test point 2	Body ground

   Is there battery voltage?

   YES 

   The GA SYS ON wire is OK. Go to step 10.

   NO 

   Go to step 14. Refer to:  14

10. Open wire check (GA BUS+ line, GA BUS- line)

    -1. Disconnect the following connectors.

    Audio unit connector D (12P)

    Tuner unit connector A (12P)

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

    Test condition	Vehicle OFF (LOCK) mode
    	Audio unit connector D (12P): disconnected
    	Tuner unit connector A (12P): disconnected
    Test point 1	Audio unit connector D (12P) No. 7 - Refer to: Audio Unit Connector for Inputs and Outputs (Without Touch Screen) (2013), or Audio Unit Connector for Inputs and Outputs (With Touch Screen) (2013), or Audio Unit Connector for Inputs and Outputs (Without Touch Screen) (2014), or Audio Unit Connector for Inputs and Outputs (With Touch Screen) (2014), or Audio Unit Connector for Inputs and Outputs (With Touch Screen) (2015), or Audio Unit Connector for Inputs and Outputs (Without Touch Screen) (2015), or Audio Unit Connector for Inputs and Outputs (Display Audio) (2016-17), or Audio Unit Connector for Inputs and Outputs (Normal Audio) (2016-17)
    Test point 2	Tuner unit connector A (12P) No. 7 - Refer to: Tuner Unit Connector for Inputs and Outputs, or Tuner Unit Connector for Inputs and Outputs (Display Audio) (2016-17)

    Test point 1

    Audio unit connector D (12P) No. 1 - Refer to: Audio Unit Connector for Inputs and Outputs (Without Touch Screen) (2013), or Audio Unit Connector for Inputs and Outputs (With Touch Screen) (2013), or Audio Unit Connector for Inputs and Outputs (Without Touch Screen) (2014), or Audio Unit Connector for Inputs and Outputs (With Touch Screen) (2014), or Audio Unit Connector for Inputs and Outputs (With Touch Screen) (2015), or Audio Unit Connector for Inputs and Outputs (Without Touch Screen) (2015), or Audio Unit Connector for Inputs and Outputs (Display Audio) (2016-17), or Audio Unit Connector for Inputs and Outputs (Normal Audio) (2016-17)

    Test point 2

    Tuner unit connector A (12P) No. 1 - Refer to: Tuner Unit Connector for Inputs and Outputs, or Tuner Unit Connector for Inputs and Outputs (Display Audio) (2016-17)

    Is there continuity?

    YES 

    Replace the tuner unit .

    NO 

    There is an open in the wire (s) between the audio unit and the tuner unit. Replace the affected shielded harness.

11. Open wire check (GA +B line)

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

    Test condition	Vehicle ON mode
    Test point 1	Audio unit connector D (12P) No. 12 - Refer to: Audio Unit Connector for Inputs and Outputs (Without Touch Screen) (2013), or Audio Unit Connector for Inputs and Outputs (With Touch Screen) (2013), or Audio Unit Connector for Inputs and Outputs (Without Touch Screen) (2014), or Audio Unit Connector for Inputs and Outputs (With Touch Screen) (2014), or Audio Unit Connector for Inputs and Outputs (With Touch Screen) (2015), or Audio Unit Connector for Inputs and Outputs (Without Touch Screen) (2015), or Audio Unit Connector for Inputs and Outputs (Display Audio) (2016-17), or Audio Unit Connector for Inputs and Outputs (Normal Audio) (2016-17)
    Test point 2	Body ground

    Is there battery voltage?

    YES 

    Repair an open in the wire between the audio unit and the tuner unit.

    NO 

    The GA +B wire is not open. Go to step 12.

12. Shorted wire check (GA +B line)

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

    - 2. Disconnect the following connectors.

    Audio unit connector D (12P)

    Tuner unit connector A (12P)

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

    Test condition	Vehicle OFF (LOCK) mode
    	Audio unit connector D (12P): disconnected
    	Tuner unit connector A (12P): disconnected
    Test point 1	Tuner unit connector A (12P) No. 12 - Refer to: Tuner Unit Connector for Inputs and Outputs, or Tuner Unit Connector for Inputs and Outputs (Display Audio) (2016-17)
    Test point 2	Body ground

    Is there continuity?

    YES 

    Repair a short to body ground in the wire between the audio unit and the tuner unit.

    NO 

    Replace the audio unit - Refer to: Audio Unit Removal and Installation (Without Touch Screen), or Audio Unit Removal and Installation (With Touch Screen), or Audio Unit Removal and Installation (Display Audio) (2016-17) .

13. Open wire check (GA GND line)

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

    Test condition	Vehicle ON mode
    Test point 1	Audio unit connector D (12P) No. 6 - Refer to: Audio Unit Connector for Inputs and Outputs (Without Touch Screen) (2013), or Audio Unit Connector for Inputs and Outputs (With Touch Screen) (2013), or Audio Unit Connector for Inputs and Outputs (Without Touch Screen) (2014), or Audio Unit Connector for Inputs and Outputs (With Touch Screen) (2014), or Audio Unit Connector for Inputs and Outputs (With Touch Screen) (2015), or Audio Unit Connector for Inputs and Outputs (Without Touch Screen) (2015), or Audio Unit Connector for Inputs and Outputs (Display Audio) (2016-17), or Audio Unit Connector for Inputs and Outputs (Normal Audio) (2016-17)
    Test point 2	Body ground

    Is there any voltage?

    YES 

    Replace the audio unit - Refer to: Audio Unit Removal and Installation (Without Touch Screen), or Audio Unit Removal and Installation (With Touch Screen), or Audio Unit Removal and Installation (Display Audio) (2016-17) .

    NO 

    Repair an open or high resistance in the wire between the audio unit and the tuner unit.

14. Open wire check (GA SYS ON line)

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

    Test condition	Vehicle OFF (LOCK) mode
    Test point 1	Audio unit connector D (12P) No. 8 - Refer to: Audio Unit Connector for Inputs and Outputs (Without Touch Screen) (2013), or Audio Unit Connector for Inputs and Outputs (With Touch Screen) (2013), or Audio Unit Connector for Inputs and Outputs (Without Touch Screen) (2014), or Audio Unit Connector for Inputs and Outputs (With Touch Screen) (2014), or Audio Unit Connector for Inputs and Outputs (With Touch Screen) (2015), or Audio Unit Connector for Inputs and Outputs (Without Touch Screen) (2015), or Audio Unit Connector for Inputs and Outputs (Display Audio) (2016-17), or Audio Unit Connector for Inputs and Outputs (Normal Audio) (2016-17)
    Test point 2	Body ground

    Is there battery voltage?

    YES 

    Repair an open in the wire between the audio unit and the tuner unit.

    NO 

    Replace the audio unit - Refer to: Audio Unit Removal and Installation (Without Touch Screen), or Audio Unit Removal and Installation (With Touch Screen), or Audio Unit Removal and Installation (Display Audio) (2016-17) .