Description
U1300 is indicated when a communication signal malfunction occurs. U1300 is indicated along with DTCs that identify components connected to the AV control unit through communication lines. Determine the possible malfunction cause from the table below.
SELF-DIAGNOSIS RESULTS DISPLAY ITEM

U1255 satellite radio tuner
U1310 AV control unitRoof link assembly
Removal and Installation
Removal
Remove the sunshade. Refer to RF-153, "Removal and Installation".
Remove the wind deflector. Refer to RF-168, "Removal and Installation".
Remove the glass lid assembly. Refer to RF-150, "Removal and
Installation".
Remove the sunroof motor. Refer to RF-1 ...
Communication signal circuit
SATELLITE RADIO TUNER
SATELLITE RADIO TUNER : Description
Communication signals are exchanged between the AV control unit and satellite
radio tuner using the communication
circuits.
SATELLITE RADIO TUNER : Diagnosis Procedure
1.CHECK HARNESS - 1
Turn ignition switch OFF.
Disconnect ...
System description
CAN COMMUNICATION SYSTEM
CAN System Specification Chart
Determine CAN system type from the following specification chart.
NOTE:
Refer to LAN-15, "Trouble Diagnosis Procedure" for how to use CAN
system specification chart.
VEHICLE EQUIPMENT IDENTIFICATION INFORMATION
NOTE:
Check CAN system ...