Navigation Display Unit Inputs and Outputs

Fig 1: Identifying Navigation Display Unit Connector (A) (20P) Terminals

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Navigation Display Unit Connector (A) (20P)

VOLTAGE SPECIFICATION

Terminal Number

Wire Color

Terminal Name

Description

Voltage (about)

Symptom

WHT/RED

+B (+B power source)

Continuous power source

Battery voltage

If open: Screen completely off (no backlight visible).
If short to ground: Blows fuse No. 7 (7.5 A) in the under-dash fuse/relay box.

YEL/RED

ACC (Accessory)

Power source for accessory

Battery voltage at ACC (I)

If open: Display and buttons do not work.
If short to ground: Blows fuse No. 32 (7.5 A) in the under-dash fuse/relay box.

WHT

AUDIO BUS+ (GA-NET)

Data bus+ GA-NET

0-5 V pulses average 2.5 V (depends on bus traffic)

If open: XM radio, Navigation buttons and touch screen do not work.
If short to ground: XM radio, audio disc changer. Navigation buttons and touch screen do not work.

GRY⁽¹⁾

AUDIO BUS SH (Shield audio)

Shield for terminals No. 3, 13

0 V

If open: No change to display.
If short to ground: No change to display.

LT GRN

ECU BUS+ (GA-NET) (Display bus positive)

Data bus+ GA-NET

0-5 V pulses average 2.5 V (depends on bus traffic)

If open: XM radio. Navigation buttons and touch screen do not work.
If short to ground: XM radio, audio disc changer, Navigation buttons and touch screen do not work.

YEL

SECURITY+

Security signal to rear screen

0 V

If open: If security system set, it will not trip when screen is removed.
If short to ground: The security system set, it will not trip when screen is removed.

WHT

R SIG1 (Red signal)

Red color signal

0.2 V AC average in RGB color diagnostic mode

If open: Red color missing (see RGB Color diagnostic).
If short to ground: Red color missing (see RGB Color diagnostic).

RED

G SIG1 (Green signal)

Green color signal

0.2 VAC average in RGB color diagnostic mode

If open: Green color missing (see RGB Color diagnostic).
If short to ground: Green color missing (see RGB Color diagnostic).

BLK

GND (Ground) (G402)

Ground for display unit

0 V

If open: No change to display.
If short to ground: No change to display.

RED/BLK

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 fuse 7 in under-dash fuse/relay box.

RED

ILL CNT

Ground for illumination light

With full dash lights brightness, 0 V

If open: When brightness = Auto, night mode for the display is inoperative when lights on.
If short to ground: No change to display.

BLU/RED

AUDIO BUS-(GA-NET)

Data bus - GA-NET

0-5 V pulses average 2.5 V depends on bus traffic

If open: XM radio, Navigation buttons and touch screen do not work.
If short to ground: XM radio, audio disc changer, and the navigation hard and touch buttons work OK.

GRY⁽¹⁾

SH ECU BUS (GA-NET) (Shield display bus)

Shield for display bus terminal No. 5, 15

0 V

If open: No change to display.
If short to ground: No change to display.

PUR

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: XM radio, Navigation buttons and touch screen do not work.
If short to ground: XM radio, audio disc changer, and the navigation hard and touch buttons work OK.

GRN/WHT

SECURITY-

Security signal from audio disc changer

0 V

If open: The security system set, it will not trip when screen is removed.
If short to ground: If security system set, it will not trip when screen is removed.

BLU

GND SIG1 (Ground signal)

Ground for color signal

0 V

If open: No change to display.
If short to ground: No change to display.

YEL

B SIG1 (Blue signal)

Blue color signal

0.2 V AC average in RGB color diagnostic mode

If open: Blue color missing (see RGB Color diagnostic).
If short to ground: Blue color missing (see RGB Color diagnostic).

BRN

C SIG1 (Composite signal)

Composite video (vertical/horizontal) synchronizing signal

0.2 V AC average in RGB color diagnostic mode

If open: Picture rolls horizontally, colors still visible.
If short to ground: Picture rolls horizontally, colors still visible.

GRY⁽¹⁾

SH SIG1 (Shield signal)

Shield for terminals No. 8, 9, 17, 18, 19

0 V

If open: No change to display.
If short to ground: No change to display.

⁽¹⁾	The shielded wires have a heat-shrink 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 shown on the circuit diagram.

Fig 2: Identifying Navigation Display Unit Connector B (10P) Terminals

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Navigation Display Unit Connector B (TOP)

VOLTAGE SPECIFICATION

Terminal Number	Wire Color	Terminal Name	Description	Voltage (about)	Symptom
9	GRN	DISP OPEN	Display open/close signal	0-3.3 V	If open: CD Eject/Load function does not work. If short to ground: CD Eject/Load function works.
10	GRN/RED	CD EJECT	CD eject signal	0-3.3 V	If open: Display can be opened or closed. If short to ground: Display cannot be opened or closed.