Toyota Sienna Service Manual: Radio Receiver Communication Error

INSPECTION PROCEDURE

1 IDENTIFY THE COMPONENT SHOWN BY THE SUB-CODE

1. Enter the diagnostic mode

2. Press the preset switch "3" to change to "Detailed Information Mode".
3.  Identify the component shown by the sub-code.

HINT:

•  "190 (radio receiver)" is the component shown by the subcode in the example shown in the illustration.
• For details of the DTC display, refer to "DTC CHECK/ CLEAR"

2 CHECK POWER SOURCE CIRCUIT OF COMPONENT SHOWN BY SUB-CODE

1. Inspect the power source circuit of the component shown by the sub-code.

   If the power source circuit is operating normally, proceed to the next step.

Component Table:

3 INSPECT RADIO RECEIVER

1. Disconnect the radio receiver connectors.
2.  Measure the resistance according to the value(s) in the table below.

Standard resistance

*1: 10 Speaker System

4 CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - COMPONENT SHOWN BY SUB-CODE)

HINT:

•  Start the check from the circuit that is near the component shown by the sub-code first.
•  For details of the connectors, refer to the "TERMINALS OF ECU".

1.  Referring to the AVC-LAN wiring diagram below, check the AVC-LAN circuit between the radio receiver and the component shown by the sub-code.

1.  Disconnect all connectors between the radio receiver and the component shown by sub-code.
2. Check for an open or short in the AVC-LAN circuit between the radio receiver and the component shown by the sub-code.

OK: There is no open or short circuit.

5 REPLACE COMPONENT SHOWN BY SUB-CODE

1. Replace the component shown by the sub-code with a normal one and check if the same problem occurs again.

OK: Same problem does not occur.

END