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Gateway ECU Communication Error

IDENTIFY THE COMPONENT SHOWN BY THE SUB-CODE
1. Enter the diagnostic mode.
  
  Fig 1: Service Check Mode Communication Diagram - Detailed Information Mode
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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 sub-code in the example shown in the illustration.
- For details of the DTC display, refer to "DTC CHECK/CLEAR " .

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 TABLE

Component	Proceed to
Integration control & panel assembly (1D8)	INTEGRATION CONTROL & PANEL ASSEMBLY POWER SOURCE CIRCUIT
Stereo component amplifier (440)	STEREO COMPONENT AMPLIFIER POWER SOURCE CIRCUIT
Radio receiver (190)	RADIO RECEIVER POWER SOURCE CIRCUIT

INSPECT RADIO RECEIVER

Disconnect the radio receiver connectors.

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

Standard resistance

TESTER CONNECTION AND SPECIFIED CONDITION CHART

Tester connection	Condition	Specified condition
ATX+ - ATX-	Always	60 to 80Ω
TXM+ - TXM-	Always	60 to 80Ω
TX+ - TX-	Always	60 to 80Ω

Fig 2: Identifying Radio Receiver Connectors And Terminals

G04050162

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE RADIO RECEIVER

OK: Go to next step.

CHECK HARNESS AND CONNECTOR (GATEWAY ECU - 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 gateway ECU and the component shown by the sub-code.
  1. Disconnect all connectors between the gateway ECU and the component shown by sub-code.
  2. Check for an open or short in the AVC-LAN circuit between the gateway ECU and the component shown by the sub-code.
    OK: There is no open or short circuit.
Fig 3: 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 normal one and check if the same problem occurs again.
  OK: Same problem does not occur.
NG: REPLACE GATEWAY ECU

OK: END