Microphone Circuit between Multi-display and Navigation ECU: 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: Microphone Circuit Between Multi-Display And Navigation ECU - Wiring Diagram

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INSPECT NAVIGATION ECU

Disconnect the navigation ECU connector N6.

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

Resistance

ECU CONNECTOR TERMINAL RESISTANCE SPECIFICATION

Tester connection	Condition	Specified condition
SNSE - Body ground	Always	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 2: Identifying Navigation ECU Connector N6

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OK: GO TO NEXT STEP.

CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY - NAVIGATION ECU)

Disconnect the multi-display connector M4 and navigation ECU connector N6.

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

Resistance

ECU CONNECTOR TERMINAL RESISTANCE SPECIFICATION

Tester connection	Condition	Specified condition
MCO+ - MIC+	Always	Below 1 Ω
MCO- - MIC-	Always	Below 1 Ω
MCO+ - Body ground	Always	10 kΩ or higher
MCO- - Body ground	Always	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 3: Identifying Multi-Display Connector M4 And Navigation ECU Connector N6

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