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Audio-Navigation Unit Inputs and Outputs

WARNING: This page is about a different car, the 2013 Acura MDX, 2012 Acura MDX, 2011 Acura MDX, and 2010 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Audio-Navigation Unit Connector A (24P)
G08058072Courtesy of AMERICAN HONDA MOTOR CO., INC.
AUDIO-NAVIGATION UNIT CONNECTOR A (24P)

Terminal Number Wire Color Terminal Name Description Voltage (about) Symptom
4 LT GRN SCTY4 Security signal from navigation display unit 0V If open: The security system sets, and does not trip when navigation display unit is removed. If short to ground: The security system sets, and does not trip when navigation display unit is removed.
12 BLK GND (Ground) (G504) Ground for audio-navigation unit 0V If open: No effect on system. If short to ground: No effect on system.
14 PUR ACC (Accessory) Power source for accessories Battery voltage at ACCESSORY (I) If open: Display picture goes out (display back light still on).
If short to ground: Blows fuse No. 32 (10 A) in the under-dash fuse/relay box.
15 BLU VSP (Vehicle speed pulse) Vehicle speed pulse signal from PCM 0-5 V pulses average 2.5 V (Depending on bus traffic) If open: No vehicle speed pulses.
Diagnostic screen Car Status, VSP=0.
If short to ground: No vehicle speed pulses.
Diagnostic screen Car Status, VSP=0.
24 WHT + B (+ B Power source) Continuous power source Battery voltage If open: Navigation display picture goes out (display back light still on).
NOTE: System reboots to enter code screen.

If short to ground: Blows fuse No. 5 (10 A) in the under-dash fuse/relay box.


Fig 1: Identifying Audio-Navigation Unit Connector B (24P)
G08058073Courtesy of AMERICAN HONDA MOTOR CO., INC.
AUDIO-NAVIGATION UNIT CONNECTOR B (24P)

Terminal Number Wire Color Terminal Name Description Voltage (about) Symptom
18 RED GA-NET BUS B-(GA-Net bus negative) Data bus(-) GA-Net 0-5 V pulses average 2.5 V depends on bus traffic If open: GA-Net related system does not work. If short to ground: GA-Net related system does not work.
19 GRN GA-NET BUS B+ (GA-Net bus positive) Data bus (+) GA-Net 0-5 V pulses average 2.5 V depends on bus traffic If open: GA-Net related system does not work. If short to ground: GA-Net related system does not work.
22 BRN(1) GA-NET BUS B SH (GA-Net bus shield) Shield for display bus terminals No. 18, 19 0V 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 listed on the schematic.


Fig 1: Identifying Audio-Navigation Unit Connector C (28P)
G08058074Courtesy of AMERICAN HONDA MOTOR CO., INC.
AUDIO-NAVIGATION UNIT CONNECTOR C (28P)

Terminal Number Wire Color Terminal Name Description Voltage (about) Symptom
4 YEL ILL+ (Illumination positive) Parking light on signal Lights on: battery voltage, Lights off: 0 V If open: When brightness=Auto, night mode for the display is inoperative when lights on. If short to ground: No effect on system.
5 YEL DIAG-(Diagnostic negative) Ground for service check signal 0V If open: The system will not go into diagnostic mode when using the SCS jumper. If short to ground: No effect on system.
9 RED(2) HFL/HIP COMM2 (HFL communication 2) Communication signal for HFL 4.5 V DC(2) HFL icon in Navi System Link changes between red and green
WHT(3) ---
10 WHT(2) HFL/HIP COMM1 (HFL communication 1) Communication signal for HFL 5 V DC(2) HFL icon in Navi System Link changes between red and green
RED(3) ---
13 BRN(1) JOG SH (Interface dial Jog shield) Shield for interface dial signal --- ---
14 BRN(1) HFL MIC OUT SH (HFL mic signal shield) Shield for terminals No. 27, 28 0V If open: No effect on voice control. If short to ground: No effect on voice control.
18 GRY DIAG + (Diagnostic positive) Service check signal for navigation system 5-6 V If open: No effect on system. If short to ground: System goes into diagnostic mode at ACCESSORY (1) or ON (II).
20 BRN BACK LT (Back light or reverse signal) Reverse signal of select lever from MICU (Multiplex Integrated Control Unit) In reverse, battery voltage: Otherwise 0 V If open: Navigation never sees reverse. Diagnostic screen Car Status, Back=0. If short to ground: Check the backup light circuit.
22 BLK HFL/HIP COMM4 (HFL communication 4) Communication signal for HFL 4.5 V DC(2) Solid red HFL icon in Navi System Link
---
23 GRN HFL/HIP COMM3 (HFL communication 3) Communication signal for HFL 5 V DC(2) Solid red HFL icon in Navi System Link
---
24 GRY(1)(2) HFL/HIP COMM SH (shield HFL) Shield for terminals No. 9, 10, 22, 23 0V ---
BRN(1)(3)
26 WHT JOG BUS (Interface dial Jog) Interface dial operation signal 0-5 V pulses If open: You cannot operate navigation system If short to ground: You cannot operate navigation system.
27 LT BLU HFL MIC OUT-(HFL mic signal negative) Ground for microphone signal 0V If open: microphone signal shown as red in diagnostics: System Links and Functional Setup Mic Level. If short to ground: No effect on voice recognition.
28 PUR HFL MIC OUT+ (HFL mic signal positive) Microphone output signal positive 4-5V (TALK button pressed) If open: microphone signal shown as red in diagnostic screens: System Links and Functional Setup Mic Level.
If short to ground: microphone signal shown as red in diagnostic screens: System Links and Functional Setup Mic Level.
(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 listed on the schematic.
(2) With AcuraLink
(3) Without AcuraLink


Fig 1: Identifying Audio-Navigation Unit Connector F (20P)
G08058075Courtesy of AMERICAN HONDA MOTOR CO., INC.
AUDIO-NAVIGATION UNIT CONNECTOR F (20P)

Terminal Number Wire Color Terminal Name Description Voltage (about) Symptom
4 YEL AC SI (Air conditioner serial in) Communication signal for climate control unit --- If open: Climate control unit cannot be controlled by the navigation system. If short to ground: Climate control unit cannot be controlled by the navigation system.
5 RED AC SO (Air conditioner serial out) Communication signal for climate control unit --- If open: Climate control unit cannot be controlled by the navigation system. If short to ground: Climate control unit cannot be controlled by the navigation system.
14 BLU AC CLK (Air conditioner clock) Check signal for climate control unit --- If open: Climate control unit cannot be controlled by the navigation system. If short to ground: Climate control unit cannot be controlled by the navigation system.
17 LT BLU RG GND (Route guidance ground) Ground for voice guidance, and Voice Recognition (VR) prompts 0V If open: No effect on voice output. If short to ground: No effect on voice output.
19 PUR RG L+ (Route guidance voice left positive) Left audio signal of voice guidance, and Voice Recognition (VR) prompts Audio signal 0.004-0.04 V If open: If voice activated, radio speakers buzz; if voice off, no effect. If short to ground: If voice activated, radio speakers buzz; if voice off, no effect.
20 BRN(1) RG SH (Route guidance shield) Shield for terminals No. 17, 19 0V If open: No effect on voice output. If short to ground: No effect on voice output.
(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 listed on the schematic.


Fig 1: Identifying Audio-Navigation Unit Connector G (8P)
G08058076Courtesy of AMERICAN HONDA MOTOR CO., INC.
AUDIO-NAVIGATION UNIT CONNECTOR G (8P)

Terminal Number Wire Color Terminal Name Description Voltage (about) Symptom
2 GRN 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.
3 RED G-SIG1 (Green signal) Green color signal 0.7 V AC average in RGB color diagnostic mode If open: Green color missing (see RGB Color diagnosis).
If short to ground: Green color missing (see RGB Color diagnosis).
4 BLK SIG1 GND (Ground signal) Ground for color signal 0V If open: No change to display.
If short to ground: No change to display.
6 BRN(1) SIG1 SH (Shield signal) Shield for terminals No. 2, 3, 4, 7, 8 0V If open: No change to display.
If short to ground: No change to display.
7 YEL B-SIG1 (Blue signal) Blue color signal 0.7 V AC average in RGB color diagnostic mode If open: Blue color missing (see RGB Color diagnosis). If short to ground: Blue color missing (see RGB Color diagnosis).
8 WHT R-SIG1 (Red signal) Red color signal 0.7 V AC average in RGB color diagnostic mode If open: Red color missing (see RGB Color diagnosis). If short to ground: Red color missing (see RGB Color diagnosis).
(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 listed on the schematic.


Fig 1: Identifying Audio-Navigation Unit Connector J (2P)
G08058077Courtesy of AMERICAN HONDA MOTOR CO., INC.
AUDIO-NAVIGATION UNIT CONNECTOR J (2P)

Terminal Number Wire Color Terminal Name Description Voltage (about) Symptom
1 --- GPS GPS signal 5V If open: GPS icon on screen is not shown, system links screen ANT shown as red.
If short to body ground: Same as open.
2 --- GND GPS Ground for GPS signal 0 V If open: GPS icon on screen is not shown, system links screen ANT shown as red.
If short to body ground: No effect on system.
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