Navigation Display Unit Inputs and Output

Fig 1: Identifying Navigation Display Unit 20P Connector Terminals

Courtesy of AMERICAN HONDA MOTOR CO., INC.

VOLTAGE SPECIFICATION

Terminal Number	Wire Color	Terminal Name	Description	Voltage (about)	Symptom
1	GRN	+B (+B power source)	Continuous power source	Battery voltage	If open: Screen completely off (no backlight visible). If short to ground: Blows No. 23 (10 A) fuse in the under-hood fuse/relay box.
2	PUR	ACC (Accessory)	Power source for accessory	Battery voltage at ACC (I)	If open: Display and buttons do not work. If short to ground: Blows No. 35 (7.5 A) fuse in the under-dash fuse/relay box.
3	LT BLU	BUS (+) (GA-NET)	Data bus (+) GA-Net	0-5 V pulses average 2.5 V depends on bus traffic	If open: Navigation buttons and touch screen do not work. If short to ground: Navigation buttons do not work.
4	GRV	BUS SH (GA-NET)	Shield for No. 3,13 terminals	0 V	If open: No change to display. If short to ground: No change to display.
5	GRN	DISP BUS(+) (GA-NET) (Display bus positive)	Data bus (+) GA-Net	0-5 V pulses average 2.5 V depends on bus traffic	If open: Navigation buttons do not work. If short to ground: Navigation buttons do not work.
6	YEL	SECURITY (+)	Security signal to rear screen	0 V	If open: The security system will set, and will not trip when screen is removed. If short to ground: The security system will set, and will not trip when screen is removed.
8	WHT	R SIG 1 (Red signal)	Red color signal	0-1 VAC	If open: Red color missing (see "RGB Color" diagnostic). If short to ground: Red color missing (see "RGB Color" diagnostic).
9	RED	G SIG 1 (Green signal)	Green color signal	0-1 VAC	If open: Green color missing (see "RGB Color" diagnostic). If short to ground: Green color missing (see "RGB Color" diagnostic).
10	BLK	GND (Ground)	Ground for display unit	0 V	If open: No change to display. If short to around: No change to display.
11	GRY	ILL (+) (Illumination positive)	Parking light on signal from dash and console lights	Battery voltage if lights on: otherwise 0 V	If open: When brightness="Auto", night mode for the display is inoperative when lights on. If short to ground: Blows No. 14(7.5 A) fuse in the under-dash fuse/relay box.
13	PUR	BUS (-) (GA-NET)	Data bus (-) GA-Net	0-5 V pulses average 2.5 V depends on bus traffic	If open: Navigation buttons do not work. If short to ground: Hard buttons work OK.
14	GRV	SH DISP BUS (GA-NET) (Shield display bus)	Shield for display bus No. 5, 15 terminals	0 V	If open: No change to display. If short to ground: No change to display.
15	RED	ECU BUS (-) (GA-NET) (Display bus negative)	Data bus (-) GA-Net	0-5 V pulses average 2.5 V depends on bus traffic	If open: Navigation buttons and touch screen do not work. If short to ground: Hard and touch buttons work OK.
16	BRN	SECURITY (-)	Security signal from CD changer	0 V	If open: The security system will set, and will not trip when screen is removed. If short to ground: The security system will set, and will not trip when screen is removed.
17	BLU	GND SIG 1 (Ground signal)	Ground for color signal	0 V	If open: No change to display. If short to ground: No change to display.
18	YEL	B SIG 1 (Blue signal)	Blue color signal	0-1 VAC	If open: Blue color missing (see "RGB Color" diagnostic). If short to ground: Blue color missing (see "RGB Color" diagnostic).
19	BRN	C SIG 1 (Composite signal)	Composite video (vertical/horizontal) synchronizing signal	0.3 VAC	If open: Picture rolls horizontally, colors still visible. If short to ground: Picture rolls horizontally, colors still visible.
20	GRY	SH SIG 1 (Shield signal)	Shield for No. 8,9, 17,18,19 terminals	0 V	If open: No change to display. If short to ground: No change to display.
*: The shielded drain wires have a heat-shrunk tube insulating the outside of the wire. The color of the insulating tube, typically black or dark gray, may not match the color of the wire listed on the schematic.