LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Acura >> 2014 >> TL Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Infotainment >> Navigation System >> System Description >> Navigation Unit Connector for Inputs and Outputs >> Audio-Navigation Unit Connector H (28P)
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Audio-Navigation Unit Connector H (28P)

Fig 1: Audio-Navigation Unit H (28P) Connector End View
G08071715Courtesy of AMERICAN HONDA MOTOR CO., INC.
AUDIO-NAVIGATION UNIT CONNECTOR H (28P)

Cavity Wire Color Terminal Name Description Voltage (about) Symptom
H5 YEL DIAG- (Diagnostic negative) Ground for service check signal 0 V If open: The system will not go into diagnostic mode when using the SCS service connector. If short to ground: No effect on system.
H9(2) BLK NAVI COMM4 (HFL communication 4) Communication signal for HFL 4.5 V DC Solid red HFL icon in Navi System Link. Phone icon in the Route To screen is grayed out.
H10(2) RED NAVI COMM2 (HFL communication 2) Communication signal for HFL 4.5 V DC HFL icon in Navi System Link changes between red and green. Phone icon in the Route To screen is grayed out.
H12 WHT F-CAN H (F-CAN high) F-CAN bus communication Pulses 2.5- 6 V average 2.5 V (depends on F-CAN communication traffic) If open:
  1. System Link Meter shown as red.
  2. F-CAN System Link = NG.
  3. Car status IGNITION = 0.

If short: Same diagnostic conditions as when open, and also sets U0029 (F-CAN BUS OFF).
H13 GRY(1) JOG SH (Interface dial Shield jog) Shield for terminal No. 26 - - - -
H14 GRY(1) MIC SIG SH (HFL mic signal shield) Shield for terminals No. 27 and No. 28 0 V If open: No effect on voice control. If short to ground: No effect on voice control.
(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 circuit diagram.
(2) USA models
AUDIO-NAVIGATION UNIT CONNECTOR H (28P)

Cavity Wire Color Terminal Name Description Voltage (about) Symptom
H18 RED DIAG + (Diagnostic positive) Service check signal for navigation system 5- 6V If open: No effect on system. If short to ground: System goes into diagnostic mode at ACC or ON mode.
H22(2) GRN NAVI COMM3 (HFL communication 3) Communication signal for HFL 5 V DC Solid red HFL icon in Navi System Link. Phone icon in the Route To screen is grayed out.
H23(2) WHT NAVI COM Ml (HFL communication 1) Communication signal for HFL 5 V DC HFL icon in Navi System Link changes between red and green. Phone icon in the Route To screen is grayed out.
H24(2) GRY(1) NAVI COMM SH (shield HFL) Shield for terminals No. 9, No. 10, No. 22, and No. 23 0 V - -
H25 BLK F-CAN L (F-CAN low) F-CAN bus communication Pulses 2.5- 6 V average 2.5 V (depends on F-CAN communication traffic) If open:
  1. System Link Meter shown as red.
  2. F-CAN System Link = NG.
  3. Car status IGNITION = 0.

If short: Same diagnostic conditions as when open, and also sets U0029 (F-CAN BUS OFF).
H26 BLU JOG (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.
H27 RED MIC SIG-(HFL mic signal negative) Ground for microphone signal 0 V If open: microphone signal shown as red in diagnostics: System Link and Functional Setup Mic Level. If short to ground: No effect on voice recognition.
H28 GRN MIC SIG + (HFL mic signal positive) Microphone output signal positive 4- 5 V (TALK button pressed) If open: microphone signal shown as red in diagnostic screens: System Link and Functional Setup Mic Level.
If short to ground: microphone signal shown as red in diagnostic screens: System Link 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 circuit diagram.
(2) USA models
scientia non olet · About LEMON Manuals