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AUDIO AND VISUAL SYSTEM > Reverse Signal Circuit

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DESCRIPTION

The radio and display receiver assembly receives a reverse signal from the power management control ECU via the No. 1 integration relay.

WIRING DIAGRAM


E230082E05


INSPECTION PROCEDURE

1.CHECK HARNESS AND CONNECTOR (REVERSE SIGNAL)

  1. Disconnect the radio and display receiver assembly connector.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    L149-2 (REV) - Body ground
    		Power switch on (READY)
    Reverse (R) selected
    		11 to 15.5 V
    L149-2 (REV) - Body ground
    		Power switch on (READY)
    Except reverse (R) selected
    		Below 1 V



NG
Go to step 2
OK

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

2.CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - NO. 1 INTEGRATION RELAY)

  1. Disconnect the radio and display receiver assembly connector.

  1. Disconnect the No. 1 integration relay connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    L149-2 (REV) - 1G-4 (NAV)
    		Always
    		Below 1 Ω
    L149-2 (REV) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - POWER MANAGEMENT CONTROL ECU)

  1. Disconnect the No. 1 integration relay connector.

  1. Disconnect the power management control ECU connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1G-13 (BKUP) - A21-15 (BL)
    		Always
    		Below 1 Ω
    1G-13 (BKUP) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.REPLACE NO. 1 INTEGRATION RELAY

  1. Replace the No. 1 integration relay with a new or known good one (Click here).

  1. Check that the malfunction disappears.

    OK:
    Malfunction disappears.



NG
REPLACE POWER MANAGEMENT CONTROL ECU (Click here)
OK

END (NO. 1 INTEGRATION RELAY WAS DEFECTIVE)