Sound Signal Circuit between Radio Receiver and Multi-display Controller: Wiring Diagram

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.

Fig 1: Radio Receiver And Multi-Display Controller Sound Signal Wiring Diagram

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - MULTI-DISPLAY CONTROLLER)

Disconnect the connectors from the multi-display controller and radio receiver.

Measure the resistance according to the values in the table below.

Standard resistance

RESISTANCE SPECIFIED CONDITION

Tester connection	Condition	Specified condition
CDR+ - R+	Always	Below 1 Ω
CDR- - R-	Always	Below 1 Ω
CDL+ - L+	Always	Below 1 Ω
CDL- - L-	Always	Below 1 Ω
R+ - Body ground	Always	10 kΩ or higher
R- - Body ground	Always	10 kΩ or higher
L+ - Body ground	Always	10 kΩ or higher
L- - Body ground	Always	10 kΩ or higher

Fig 2: Identifying Connectors From Multi-Display Controller And Radio Receiver

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step.

INSPECT MULTI-DISPLAY CONTROLLER

Reconnect the multi-display controller connector.

Fig 3: Identifying Multi-Display Controller Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check the waveform according to the conditions in the table below.

Standard

WAVEFORM SPECIFIED CONDITION

Tester connection	Condition	Specified condition
R+ - Body ground	Voice sound is being produced	A waveform synchronized with sound is output
R- - Body ground	Voice sound is being produced	A waveform synchronized with sound is output
L+ - Body ground	Voice sound is being produced	A waveform synchronized with sound is output
L- - Body ground	Voice sound is being produced	A waveform synchronized with sound is output

NG: REPLACE MULTI-DISPLAY CONTROLLER

OK: RETURN TO THE ORIGINAL INSPECTION FLOW BECAUSE THE CHECK RESULT IS NORMAL