Mute Signal Circuit between Navigation Assembly and Multi-display Controller: Procedure

1. Measure the voltage according to the value(s) in the table below.
   Fig 1: Identifying Multi-Display Selector

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   Standard Voltage

   Tester Connection	Condition	Specified Condition
   L23-6 (MUT5) - Body ground	Engine switch on (ACC), audio system is playing → changing modes	3.5 V or higher → Below 1 V

NG → See step   2 

OK → See step   3 

1. Disconnect the F34 navigation module display connector.
   Fig 2: Identifying F34 Navigation Module Display Connector And L23 Selector Connector Terminals

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2. Disconnect the L23 selector connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F34-8 (MUTE) - L23-6 (MUT5)	Always	Below 1 Ω
   F34-8 (MUTE) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   4