DTC 01-DF Master Error: Description

DTC DETECTION CONDITION

DTC No.

DTC Detection Condition

Trouble Area

01-DF
⁽¹⁾

The device with a display fails and the master is switched to the audio device.
Also when a communication error between sub-master (audio) and master occurs, this code is stored.

Radio receiver power source circuit
AVC-LAN circuit between the radio receiver and the component which has stored this code
Radio receiver
Component which has stored this code

HINT:

⁽¹⁾	When 210 seconds have elapsed after disconnecting the power supply connector of the master component with the engine switch on (ACC or IG), this code is stored.

NOTE:

Before starting troubleshooting, be sure to clear DTCs to erase codes stored due to the reasons described in the HINT above. Then, check for DTCs and troubleshoot according to the output DTCs.
The radio receiver is the master unit.
Be sure to clear and recheck DTCs after the inspection is completed to confirm that no DTCs are output.

NOTE: Be sure to read DESCRIPTION before performing the following procedures.

CHECK RADIO RECEIVER POWER SOURCE CIRCUIT
Refer to the Radio Receiver Power Source Circuit .

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

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 80 Ω
TXM+ - TXM-	Always	60 to 80 Ω
TX+ - TX-	Always	60 to 80 Ω

Fig 1: Identifying Radio Receiver Connectors And Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE RADIO RECEIVER

OK: Go to next step.

IDENTIFY THE COMPONENT WHICH HAS STORED THIS CODE

Enter the diagnostic mode.

Fig 2: Service Check Mode Communication Diagram - Detailed Information Mode
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Press the preset switch "3" to change to "Detailed Information Mode ".
Identify the component which has stored this code.

Component Table:

COMPONENT TABLE

Component	Physical address
Gateway ECU	1C6
Stereo component amplifier	440
Integration control & panel assembly	1D8

HINT:

"440 (stereo component amplifier)" is the component which has stored this code in the example shown in the illustration.
For details of the DTC display, refer to the "DTC CHECK/CLEAR " .

CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - COMPONENT WHICH HAS STORED THIS CODE)
HINT:

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 which has stored this code.
  1. Disconnect all connectors between the radio receiver and the component which has stored this code.
  2. Check for an open or short in the AVC-LAN circuit between the radio receiver and the component which has stored this 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 RADIO RECEIVER
1. Replace the radio receiver with a normal one and check if the same problem occurs again.
  OK: Same problem does not occur.
NG: REPLACE COMPONENT WHICH HAS STORED THIS CODE

OK: END