Radio Receiver Communication Error: Procedure

IDENTIFY COMPONENT SHOWN BY SUB-CODE
1. Enter diagnostic mode.
  
  Fig 1: Identifying Service Check Mode And Detailed Information Mode
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Press preset switch "2" to change the mode to "Detailed Information Mode".
3. Identify the component shown by the sub-code.
  HINT:
  - The sub-code "P190" shown in the above example indicates the radio receiver assembly.
  - For details of the DTC display, refer to DTC Check/Clear, refer to DTC CHECK / CLEAR .
NEXT: Go to next step

CHECK COMPONENT SHOWN BY SUB-CODE

Select the component shown by the sub-code.

HINT:

The satellite radio tuner is built into the radio receiver assembly. If there is a problem between the satellite radio tuner and radio receiver assembly, replace the radio receiver assembly.

COMPONENT TABLE

Component	Proceed to
Except satellite radio tuner	A
Satellite radio tuner (1F1)	B

B → See step 7

A: Go to next step

CHECK POWER SOURCE CIRCUIT OF COMPONENT SHOWN BY SUB-CODE

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

Component	Proceed to
Stereo component amplifier assembly (440)	Stereo component amplifier power source circuit, refer to Stereo Component Amplifier Power Source Circuit
Multi-media interface ECU (388)	Multi-media interface ECU power source circuit, refer to Multi-media Interface ECU Power Source Circuit

NEXT: Go to next step

INSPECT RADIO RECEIVER ASSEMBLY

Disconnect the radio receiver assembly connectors.

Fig 2: Inspecting Radio Receiver
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard Resistance

W/ BACK DOOR SPEAKER

Tester Connection	Condition	Specified Condition
E2-5 (ATX+) - E2-15 (ATX-)	Always	60 to 80 Ω
E16-9 (TXM+) - E16-10 (TXM-)	Always	60 to 80 Ω

W/O BACK DOOR SPEAKER

Tester Connection	Condition	Specified Condition
E16-9 (TXM+) - E16-10 (TXM-)	Always	60 to 80 Ω

TEXT IN ILLUSTRATION

*A	w/ Back Door Speaker
*a	Component without harness connected (Radio Receiver Assembly)

NG → See step 7

OK: Go to next step

CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - 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 Terminals of ECU, refer to TERMINALS OF ECU .
1. Referring to the following AVC-LAN wiring diagram, check the AVC-LAN circuit between the radio receiver assembly and the component shown by the sub-code.
  1. Disconnect all connectors between the radio receiver assembly and the component shown by the sub-code.
  2. Check for an open or short in the AVC-LAN circuit between the radio receiver assembly and the component shown by the sub-code.
    OK
    
    There is no open or short circuit.
    
    Fig 3: Identifying AVC-LAN Wiring Diagram
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step
REPLACE COMPONENT SHOWN BY SUB-CODE
1. Replace the component shown by the sub-code with a known good one and check if the same problem occurs again.
  OK
  
  Malfunction disappears.
NG → See step 7

OK → END
REPLACE RADIO RECEIVER ASSEMBLY. Refer to REMOVAL