Sound Signal Circuit Between Navigation Receiver Assembly and Multi-media Interface ECU

NAVIGATION / MULTI INFO DISPLAY: NAVIGATION SYSTEM (w/ USB Audio System): Sound Signal Circuit between Navigation Receiver Assembly and Multi-media Interface ECU
- Sound Signal Circuit between Navigation Receiver Assembly and Multi-media Interface ECU

DESCRIPTION

The multi-media interface ECU sends sound signals to the navigation receiver assembly through this circuit. If there is an open or short in the circuit, sound cannot be heard from the speakers even if there is no malfunction in the stereo component amplifier assembly, navigation receiver assembly or speakers.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK NAVIGATION RECEIVER ASSEMBLY

(a) Using an oscilloscope, check the signal waveform between each terminal and the body ground according to the conditions, as shown in the chart below.





OK:





Text in Illustration





NG -- CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER - MULTI-MEDIA INTERFACE ECU)

OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Problem Symptoms Table

2. CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER - MULTI-MEDIA INTERFACE ECU)

(a) Disconnect the D59 navigation receiver assembly connector.

(b) Disconnect the D66 multi-media interface ECU connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE MULTI-MEDIA INTERFACE ECU Removal