Inspection Procedure

WARNING: This page is about a different car, the 2007 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.

IDENTIFY COMPONENT SHOWN BY SUB-CODE
1. Enter the diagnostic mode.
2. Press the "LAN Mon" switch to change to "LAN Monitor" mode.
3. Identify the component shown by the sub-code.
  HINT:
  - "110 (multi-display)" is the component shown by the sub-code in the example shown in the illustration.
  - The sub-code will be indicated by its physical address.
  - For the component list, refer to "DIAGNOSIS DISPLAY DETAILED DESCRIPTION " .
    
    Fig 1: Gateway ECU Communication Error Screen Display
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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 REFERENCE CHART

Component	Proceed to
Radio receiver (190)	RADIO RECEIVER POWER SOURCE CIRCUIT
Stereo component amplifier (440)	STEREO COMPONENT AMPLIFIER POWER SOURCE CIRCUIT
Multi-display (110)	MULTI-DISPLAY POWER SOURCE CIRCUIT
Navigation ECU (178)	NAVIGATION ECU POWER SOURCE CIRCUIT

INSPECT RADIO RECEIVER ASSEMBLY

Disconnect the R5 and R6 receiver connectors.

Measure the resistance of the receiver.

Standard resistance

STANDARD RESISTANCE REFERENCE CHART

Tester Connection	Specified Condition
R6-5 (TX+) - R6-15 (TX-)	60 to 80 Ω
R5-9 (TX+) - R5-10 (TX-)	60 to 80 Ω

NG: REPLACE RADIO RECEIVER ASSEMBLY

Fig 2: Check Radio Receiver Assembly

OK: Go to Next Step

CHECK WIRE HARNESS (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 "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 AND 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