NAVIGATION SYSTEM Sound Signal Circuit between Radio Receiver and Extension Module

DESCRIPTION

The navigation ECU sends the sound signal to the radio and display 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*1, radio and display receiver assembly, navigation ECU or speakers.


WIRING DIAGRAM

B00487XE02
*a Navigation ECU
*b Radio and Display Receiver Assembly

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - NAVIGATION ECU)


    1. Disconnect the z9 radio and display receiver assembly connector.

    2. Disconnect the z8 navigation ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      z9-2 (CDR+) - z8-13 (CDR+) Always Below 1 Ω
      z9-3 (CDR-) - z8-12 (CDR-) Always Below 1 Ω
      z9-4 (CDL+) - z8-15 (CDL+) Always Below 1 Ω
      z9-5 (CDL-) - z8-14 (CDL-) Always Below 1 Ω
      z9-2 (CDR+) - Body ground Always 10 kΩ or higher
      z9-3 (CDR-) - Body ground Always 10 kΩ or higher
      z9-4 (CDL+) - Body ground Always 10 kΩ or higher
      z9-5 (CDL-) - Body ground Always 10 kΩ or higher

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR