Stereo Component Amplifier 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:

1. The "190 (radio receiver)" is the component shown by the sub-code in the example shown in the illustration.
   
2. For details of the DTC display, refer to the "DTC CHECK/CLEAR" (Click here).
   

NEXT

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 

   Component	Proceed to
   Gateway ECU (1C6)	Gateway ECU power source circuit (Click here)
   Radio receiver (190)	Radio receiver power source circuit (Click here)

NEXT

3. INSPECT RADIO RECEIVER

1. Disconnect the radio receiver connector.

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

   Resistance:

   Tester Connection	Condition	Specified Condition
   ATX+ (R2-5) - ATX- (R2-15)	Always	60 to 80 Ω
   TX+ (R3-9) - TX- (R3-10)	Always	60 to 80 Ω

NG	REPLACE RADIO RECEIVER

OK

4. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER - COMPONENT SHOWN BY SUB-CODE)

HINT:

1. Start the check from the circuit that is near the component shown by the sub-code first.
   
2. For details of the connectors, refer to the "Terminals of ECU" (Click here).
   

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

   1. Check for an open or short in the AVC-LAN circuit between the stereo component amplifier and the component shown by the sub-code.

      OK:

      There is no open or short circuit.
      

      
      

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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.
   

NG	REPLACE STEREO COMPONENT AMPLIFIER (STANDARD SYSTEM)
NG	REPLACE STEREO COMPONENT AMPLIFIER (MARK LEVINSON SYSTEM)

OK
END