Navigation ECU Power Source Circuit

DESCRIPTION

This is the power source circuit to operate the navigation ECU.

WIRING DIAGRAM

INSPECTION PROCEDURE

1. INSPECT MULTI-DISPLAY

1. Disconnect the navigation ECU connector p2.

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

   Standard resistance:

   Tester connection	Condition	Specified condition
   GND1 - Body ground	Always	Below 1 Ω

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

   Standard voltage:

   Tester connection	Condition	Specified condition
   +B - GND1	Always	10 to 14 V
   ACC - GND1	Engine switch on (ACC)	10 to 14 V

NG	Go to step 2

OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

2. CHECK HARNESS AND CONNECTOR (NAVIGATION ECU - MULTI-DISPLAY)

1. Disconnect the navigation ECU connector p2 and multi-display connector p1.

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

   Standard resistance:

   Tester connection	Condition	Specified condition
   GND1 - GND2	Always	Below 1 Ω
   ACC - ACC2	Always	Below 1 Ω
   +B - +B	Always	Below 1 Ω
   GND1 - Body ground	Always	10 kΩ or higher
   ACC - Body ground	Always	10 kΩ or higher
   +B - Body ground	Always	10 kΩ or higher

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK
REPLACE MULTI-DISPLAY