NAVIGATION SYSTEM (for HDD) Sound Signal Circuit between Navigation Receiver Assembly and Multi-media Interface ECU

DESCRIPTION

The multi-media interface ECU sends USB audio sound signals to the navigation receiver assembly via this circuit.

The sound signal that has been sent is amplified by the navigation receiver 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 navigation receiver assembly or speakers.

WIRING DIAGRAM

A017ETRE04

INSPECTION PROCEDURE

PROCEDURE


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


    1. Disconnect the E23 navigation receiver assembly connector.

    2. Disconnect the E25 multi-media interface ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E23-1 (CSLD) - E25-1 (USD1) Always Below 1 Ω
      E23-2 (CDR+) - E25-2 (URO+) Always Below 1 Ω
      E23-3 (CDR-) - E25-3 (URO-) Always Below 1 Ω
      E23-4 (CDL+) - E25-4 (ULO+) Always Below 1 Ω
      E23-5 (CDL-) - E25-5 (ULO-) Always Below 1 Ω
      E23-2 (CDR+) - Body ground Always 10 kΩ or higher
      E23-3 (CDR-) - Body ground Always 10 kΩ or higher
      E23-4 (CDL+) - Body ground Always 10 kΩ or higher
      E23-5 (CDL-) - Body ground Always 10 kΩ or higher
      E23-1 (CSLD) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here