DTC B1561: XM Tuner Disconnected (Command Line); DTC B159F: No Response from XM Tuner: Procedure

1. Check for optional components
   1. Check that optional components (including associated wiring) which generate radio waves are not installed.
      RESULT
      
      

      Result	Proceed to
      Optional components (including associated wiring) are installed.	A
      Optional components (including associated wiring) are not installed.	B

   HINT: 

   • Electrical noise from radio waves generated by optional components or the wiring for those components may affect AVC-LAN communication.
   • This DTC may be stored when an AVC-LAN communication error occurs due to electrical noise.

B → See step   3 

A: Go to next step 

1. Remove optional components (including associated wiring).
   NOTE:

   Do not remove optional components or associated wiring without the permission of the customer.

NEXT: Go to next step 

1. Clear the DTCs. Refer to DTC CHECK / CLEAR .
2. Check for DTCs and check if the same trouble occurs again.

   OK

   No DTCs are output.

NG → See step   4 

OK → END (STEREO COMPONENT TUNER ASSEMBLY IS FAULTY) 

1. Disconnect the L20 stereo component tuner assembly connector.
   Fig 1: Checking Harness And Connector (Stereo Component Tuner Power Source)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   L20-7 (GND) - Body ground	Always	Below 1 Ω

3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   L20-12 (+B) - Body ground	Always	11 to 14 V
   L20-11 (ACC) - Body ground	Ignition switch ACC	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Stereo Component Tuner Assembly)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the L20 stereo component tuner assembly connector.
2. Disconnect the D67 multi-media interface ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   L20-9 (TX+) - D67-4 (TX2+)	Always	Below 1 Ω
   L20-10 (TX-) - D67-5 (TX2-)	Always	Below 1 Ω
   L20-9 (TX+) - Body ground	Always	10 kΩ or higher
   L20-10 (TX-) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the D59 navigation receiver assembly connector.
2. Disconnect the D66 multi-media interface ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D59-9 (TXM+) - D66-9 (TX1+)	Always	Below 1 Ω
   D59-10 (TXM-) - D66-10 (TX1-)	Always	Below 1 Ω
   D59-9 (TXM+) - Body ground	Always	10 kΩ or higher
   D59-10 (TXM-) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Temporarily replace the stereo component tuner assembly with new or normally one. Refer to REMOVAL .
2. Clear the DTCs. Refer to DTC CHECK / CLEAR .
3. Recheck for DTCs and check if the same trouble occurs again.

   OK

   No DTCs are output.

NG → See step   8 

OK → END (STEREO COMPONENT TUNER ASSEMBLY IS FAULTY) 

1. Temporarily replace the multi-media interface ECU with new or normally one. Refer to REMOVAL .
2. Clear the DTCs. Refer to DTC CHECK / CLEAR .
3. Recheck for DTCs and check if the same trouble occurs again.

   OK

   No DTCs are output.

NG → See step   9 

OK → END (MULTI-MEDIA INTERFACE ECU IS FAULTY)