Navigation Communication Line Circuit Troubleshooting

WARNING: This page is about a different car, the 2011 Acura TL, 2010 Acura TL, and 2009 Acura TL. However, it is still accessible from the selected car via links, so may be relevant.

Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
Operate the climate control system in several modes
Is the climate control system OK?

YES -Go to step 3

NO -Do the self-diagnostic function with the HDS (see HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITH THE HDS ) or the climate control unit (see HOW TO USE THE SELF-DIAGNOSTIC FUNCTION WITHOUT THE HDS )
Go into the SYSTEM DIAGNOSTIC MODE , and select the Self-Diagnosis Mode to check the System Link (see SYSTEM LINKS ).
Is the A/C or Mic icon red?

YES -
- If A/C icon is red, go to step 4
- If Mic icon is red, go to "voice control does not work/respond" in the navigation system symptom troubleshooting (see VOICE CONTROL DOES NOT WORK/RESPOND ).
NO -Go to step 10
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
Disconnect audio-navigation unit connector D (20P)
Disconnect climate control unit connector C (20P)
Check for continuity between the following terminals of climate control unit connector C (20P) and audio-navigation unit connector D (20P)
20P 20P

No 4 No 4

No 5 No 5

No 6 No 14

Fig 1: Checking Continuity Between Terminals Of Climate Control Unit Connector C (20P) And Audio-Navigation Unit Connector D (20P)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to step 8

NO -Repair open in the wire(s) between the climate control unit and the audio-navigation unit
Check for continuity between body ground and climate control unit connector terminals No 4,5, and 6 individually

Fig 2: Checking Continuity Between Body Ground And Climate Control Unit Connector Terminals 4, 5, And 6
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Repair short to body ground in the wire(s) between the climate control unit and the audio-navigation unit

NO -Go to step 9
Reconnect climate control unit connector C (20P)
Connect the audio-navigation unit connector D (20P) terminals No 4,5, and 14 with jumper wires

Fig 3: Connecting Audio-Navigation Unit Connector D (20P) Terminals No 4, 5, And 14 With Jumper Wires
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
Press and hold the AUTO button, then press and hold the OFF button

Fig 4: Identifying Press And Hold AUTO Button
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is the HEAT/VENT indicator solid with the remaining icons blinking?

YES -Do the Unit check with the navigation system (see UNIT CHECK (QUICK CHECK) )

NO -Substitute a known-good climate control unit, and recheck If the symptom goes away, replace the original climate control unit (see Climate Control Unit Removal/Installation )