DTC 01-D6 No Master; DTC 01-D7 Connection Check Error: Description

WARNING: This page is about a different car, the 2006 Lexus RX 400h. However, it is still accessible from the selected car via links, so may be relevant.

DTC DETECTION CONDITION CHART

DTC No.	DTC Detection Condition	Trouble Area
01-D6 *1	When either of the following conditions is met: The component which has stored the code has (had) been disconnected when the ignition switch is in the ACC or ON position The master device has (had) been disconnected when this code is stored	Multi-display power source circuit Power source circuit of the component which has stored this code AVC-LAN circuit between the multi-display and the component which has stored this code Component which has stored this code Multi-display
01-D7 *2	When either of the following conditions is met: The component which has stored the code has (had) been disconnected after the engine starts (started) The master device has (had) been disconnected when this code is (was) stored
HINT: 1: Even if no failure is detected, a trouble code may be recorded depending on the battery condition or engine start voltage. 2: When 210 seconds have elapsed after disconnecting the power supply connector of the master component with the ignition switch in the ACC or ON position, 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 multi-display 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 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.

IDENTIFY THE COMPONENT WHICH HAS STORED THIS CODE

Enter the diagnostic mode.
Press the "LAN Mon" switch to change to "LAN Monitor" mode.

Identify the component which has stored this code.

Fig 1: System Check Mode - Display LAN Monitor

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Component Table

COMPONENT REFERENCE

Display	Component
AUDIO H/U	Radio receiver
DSP-AMP	Stereo component amplifier
G/W	Gateway ECU
NAVI	Navigation ECU
CAMERA	Television camera ECU
RSE	Multi-display controller

HINT:

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

CHECK POWER SOURCE CIRCUIT OF THE COMPONENT WHICH HAS STORED THIS CODE

Inspect the power source circuit of the component which has stored this code.

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

Component Table

COMPONENT REFERENCE

Component	Proceed to
Radio receiver (AUDIO H/U)	RADIO RECEIVER POWER SOURCE CIRCUIT
Stereo component amplifier (DSP-AMP)	STEREO COMPONENT AMPLIFIER POWER SOURCE CIRCUIT
Gateway ECU (G/W)	GATEWAY ECU POWER SOURCE CIRCUIT
NAVIGATION ECU POWER SOURCE CIRCUIT
Television camera ECU (CAMERA)	TELEVISION CAMERA ECU POWER SOURCE CIRCUIT
Multi-display controller (RSE)	MULTI-DISPLAY CONTROLLER POWER SOURCE CIRCUIT

CHECK RADIO RECEIVER

Disconnect the radio receiver connectors.

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

Resistance

ECU CONNECTOR TERMINAL RESISTANCE SPECIFICATION

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
TX+ (R4-9) - TX- (R4-10)	Always	60 to 80 Ω

NG: REPLACE RADIO RECEIVER

Fig 2: Identifying Radio Receiver Connectors Connector terminals

OK: GO TO NEXT STEP

CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY - COMPONENT WHICH HAS STORED THIS CODE)
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. 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.
    
    HINT:
    
    For details of the connectors, refer to "TERMINALS OF ECU " .
    
    Fig 3: AVC-LAN Communication - Wiring Diagram (With Rear Seat Entertainment System)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 4: AVC-LAN - Wiring Diagram (Without Rear Seat Entertainment System)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: GO TO NEXT STEP.
REPLACE COMPONENT WHICH HAS STORED THIS CODE
1. Replace the component which has stored this code with a normal one and check if the same problem occurs again.
  OK: Same problem does not occur.
NG: REPLACE MULTI-DISPLAY

OK: END