Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Navigation Communication Line Circuit Troubleshooting (With Navigation)
2010 Acura TL FWD V6-3.5LSECTION Navigation Communication Line Circuit Troubleshooting (With Navigation)
Navigation Communication Line Circuit Troubleshooting
1. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
2. 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 Initial Inspection and Diagnostic Overview or with the climate control unit Initial Inspection and Diagnostic Overview.�
3. Do the System Links Navigation System Diagnostic Mode 1.
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 Symptom Troubleshooting.�
NO -
Go to step 10.
4. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
5. Disconnect audio-navigation unit connector D (20P).
6. Disconnect climate control unit connector C (20P).
7. Check for continuity between the following terminals of climate control unit connector C (20P) and audio-navigation unit connector D (20P).
Is there continuity?
YES -
Go to step 8.
NO -
Repair an open in the wire(s) between the climate control unit and the audio-navigation unit.�
8. Check for continuity between body ground and climate control unit connector terminals No. 4, 5, and 6 individually.
Is there continuity?
YES -
Repair a short to body ground in the wire(s) between the climate control unit and the audio-navigation unit.�
NO -
Go to step 9.
9. Reconnect climate control unit connector C (20P).
10. Connect audio-navigation unit connector D (20P) terminals No. 4, 5, and 14 with jumper wires.
11. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
12. Press and hold the AUTO button, then press and hold the OFF button.
Is the HEAT/VENT indicator solid with the remaining icons blinking?
YES -
Do the Unit Check with the navigation system Navigation System Diagnostic Mode 1.�
NO -
Substitute a known-good climate control unit, and recheck. If the symptom goes away, replace the original climate control unit Climate Control Unit Removal/Installation.�
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.