DTC 01-DD: Master Reset; DTC 01-E1: Voice Processing Device ON Error: Procedure

CHECK MULTI-DISPLAY POWER SOURCE CIRCUIT
Refer to Multi-display Power Source Circuit .

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

NEXT: Go to next step

INSPECT RADIO RECEIVER

Disconnect the radio receiver connectors.

Fig 1: Identifying Radio Receiver Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard resistance

Tester Connection	Condition	Specified Condition
ATX+ (E69-5) - ATX- (E69-15)	Always	60 to 80 Ω
TX+ (E70-9) - TX- (E70-10)	Always	60 to 80 Ω

NG → REPLACE RADIO RECEIVER

OK: Go to next step

IDENTIFY THE COMPONENT WHICH HAS STORED THIS CODE

Enter the diagnostic mode.

Fig 2: View Of Diagnostic Tool Display - System Check Mode And LAN Monitor Screen
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Press the "LAN Mon" switch to change to "LAN Monitor" mode.

Identify the component which has stored this code.

COMPONENT TABLE:

Display	Component
AUDIO H/U	Radio receiver
DSP-AMP	Stereo component amplifier
NAVI	Navigation ECU

HINT:

"NAVI" is the component which has stored this code in the example shown in the illustration.

NEXT: Go to next step

CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY - COMPONENT WHICH HAS STORED THIS CODE)
HINT:

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 multi-display and the component which has stored this code.
  1. Disconnect all connectors between the multi-display and the component which has stored this code.
  2. Check for an open or short in the AVC-LAN circuit between the multi-display and the component which has stored this code.
    OK
    
    There is no open or short circuit.
    
    Fig 3: View Of AVC-LAN Wiring Diagram
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step
REPLACE MULTI-DISPLAY
1. Replace the multi-display 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