DTC B159E: No Response from Clock Device; DTC B1568: Clock Device Disconnected: 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.
   • These DTCs 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 DTC is output again.

   OK

   No DTCs are output.

NG → See step   4 

OK → END 

1. Disconnect the L38 clock assembly connector.
   Fig 1: Identifying L38 Clock Assembly Connector Terminals

   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
   L38-7 (E) - 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
   L38-8 (B) - L38-7 (E)	Engine switch off	11 to 14 V
   L38-4 (ACC) - L38-7 (E)	Engine switch on (ACC)	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view or wire harness connector (to Clock Assembly)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the L38 clock assembly connector.
2. Disconnect the L116 display and navigation module display connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   L38-6 (TX+1) - L116-9 (TX3+)	Always	Below 1 Ω
   L38-5 (TX-1) - L116-10 (TX3-)	Always	Below 1 Ω
   L38-6 (TX+1) - Body ground	Always	10 kΩ or higher
   L38-5 (TX-1) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Temporarily the clock assembly with new or normal functioning one. Refer to REMOVAL .
2. Clear the DTCs. Refer to DTC CHECK / CLEAR .
3. Recheck for DTCs and check if the same DTC is output again.

   OK

   No DTCs are output.

NG → See step   7 

OK → END