Sound Signal Circuit Between Navigation Receiver Assembly and Multi-media Interface ECU (from 12/2010)

NAVIGATION: NAVIGATION 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 USB audio sound signals and satellite radio sound signals to the navigation receiver assembly through this circuit.

The sound signal that has been sent is amplified by the stereo component amplifier assembly, and then is sent to the speakers.

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

(a) Disconnect the E53 navigation receiver assembly connector.

(b) Disconnect the E41 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 -- Continue to next step.

2. INSPECT MULTI-MEDIA INTERFACE ECU

(a) Reconnect the E41 multi-media interface ECU connector.





(b) Check the waveform according to the conditions in the table below.

Standard:





Text in Illustration





NG -- REPLACE MULTI-MEDIA INTERFACE ECU Removal (from 12/2010)

OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Problem Symptoms Table (from 12/2010)