NAVIGATION / MULTI INFO DISPLAY: NAVIGATION SYSTEM: DESCRIPTION (2008 LX570)

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Last Modified: 11-27-2007		1.6 J
Service Category: Audio/Visual/Telematics	Section: Navigation/Multi Info Display
Model Year: 2008	Model: LX570	Doc ID: RM0000011F302CX
Title: NAVIGATION / MULTI INFO DISPLAY: NAVIGATION SYSTEM: DESCRIPTION (2008 LX570)

Parking Brake Switch Circuit

DESCRIPTION

This circuit is from the parking brake switch to the display and navigation module display.

1.	CHECK PARKING BRAKE (DISPLAY CHECK MODE)

(b) Check that the display changes between ON and OFF according to the parking brake operation.

OK:

Parking Brake Position	Display
Applied	ON
Released	OFF

HINT:

This display is updated once per second. As a result, it is normal for the display to lag behind the actual change in the switch.

2.	CHECK MAIN BODY ECU (PARKING BRAKE SIGNAL)

(a) Disconnect the F28 display connector.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
F28-23 (PKB) - Body ground	Engine switch on (IG), parking brake applied	11 to 14 V
F28-23 (PKB) - Body ground	Engine switch on (IG), parking brake released	Below 1 V

3.	CHECK HARNESS AND CONNECTOR (DISPLAY AND NAVIGATION MODULE DISPLAY - MAIN BODY ECU)

(a) Disconnect the F28 display connector.

(b) Disconnect the 2E ECU connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F28-23 (PKB) - 2E-2 (PKB)	Always	Below 1 Ω
F28-23 (PKB) - Body ground	Always	10 kΩ or higher

4.	REPLACE MAIN BODY ECU

(a) Temporarily replace the ECU with a new or normally functioning one.

(b) Check that the parking brake signal is displayed on the multi-display.

OK:

Parking brake signal is displayed on the multi-display.