Navigation ECU Power Source Circuit: Wiring Diagram

WARNING: This page is about a different car, the 2006 Lexus GS 430 and 2006 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.

The wiring diagram is shown below.

Fig 1: Navigation ECU Power Source Circuit - Wiring Diagram (1 Of 2)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Navigation ECU Power Source Circuit - Wiring Diagram (2 Of 2)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

CHECK MULTI-DISPLAY POWER SOURCE CIRCUIT
Refer to MULTI-DISPLAY POWER SOURCE CIRCUIT .

If the power source circuit is operating normally, proceed to the next step.

NEXT

CHECK MULTI-DISPLAY

Measure the voltage of the connector.

Standard voltage

TESTER CONNECTION AND SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
h1-31 (+B) - Body ground	Always	10 to 14 V
h1-14 (ADET) - Body ground	Engine switch on (ACC)	10 to 14 V

Measure the resistance of the connector.

Standard resistance

TESTER CONNECTION AND SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
h1-2 (GND) - Body ground	Always	Below 1 Ω

NG : REPLACE MULTI-DISPLAY

Fig 3: Identifying Multi-Display

OK : REPLACE NAVIGATION ECU