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.
Auxiliary input sound is low or cannot be heard (With Navigation)
- Check the vehicle battery condition first - Refer to: Battery Test (2014 2015), or Battery Test (2016 2017 2018 2019 2020) .
- Use auxiliary stereo cables with 3.5 mm ends only.
- Auxiliary accessories may be played on the audio-navigation unit using the auxiliary input.
- Check the connectors for poor connections or loose terminals.
- Problem verification
-1. Turn the vehicle to the ON mode.
- 2. Turn on the audio system, and connect an auxiliary accessory to the auxiliary input jack.
- 3. Check the auxiliary audio source sound.
Is the sound normal?
YES
Intermittent failure, the system is OK at this time.
NO
The failure is duplicated, go to step 2.
- Determine possible failure area (volume level, others)
-1. Make sure the auxiliary accessory volume is set to high.
Is the volume set to high?
YES
Go to step 3.
NO
Raise the auxiliary accessory volume to high. Make sure the audio-navigation unit volume is turned down before rechecking.
- Determine possible failure area (auxiliary audio accessory, others)
-1. Substitute a known-good auxiliary audio accessory and/or auxiliary stereo cable, and recheck.
Does the auxiliary audio accessory operate properly?
YES
Original auxiliary audio accessory or auxiliary stereo cable is faulty.
NO
Go to step 4.
- Shorted wire check (AUX lines)
-1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Disconnect the following connectors.
Audio-navigation unit connector C (20P) Auxiliary jack assembly 5P connector - Refer to: Auxiliary Jack Assembly Removal and Installation (2014 2015 2016) or Auxiliary Jack Assembly Removal and Installation (2017 2018 2019 2020) - 3. Check for continuity between these test points and body ground individually.
Test condition Vehicle OFF (LOCK) mode Audio-navigation unit connector C (20P): disconnected Auxiliary jack assembly 5P connector: disconnected Connector Test circuit Terminal Audio-navigation unit connector C (20P) AUX SIG GND No. 8 (BLK) AUX R CH No. 17 (WHT) AUX L CH No. 18 (RED) Is there continuity?
YES
There is a short to body ground in the wire (s) between the audio-navigation unit and the auxiliary jack assembly. Repair or replace the affected harness.
NO
The AUX wires are not shorted to ground. Go to step 5.
- Shorted wire check (SH AUX line to another lines)
-1. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Audio-navigation unit connector C (20P): disconnected Auxiliary jack assembly 5P connector: disconnected Test circuit SH AUX, AUX L CH Test point 1 Audio-navigation unit connector C (20P) No. 7 (GRY) Test point 2 Audio-navigation unit connector C (20P) No. 18 (RED) Test circuit SH AUX, AUX R CH Test point 1 Audio-navigation unit connector C (20P) No. 7 (GRY) Test point 2 Audio-navigation unit connector C (20P) No. 17 (WHT) Is there continuity?
YES
There is a short in the wires between the audio-navigation unit and the auxiliary jack assembly. Replace the affected shielded harness.
NO
The SH AUX wire is OK. Go to step 6.
- Shorted wire check (AUX SIG GND line to another lines)
-1. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Audio-navigation unit connector C (20P): disconnected Auxiliary jack assembly 5P connector: disconnected Test circuit AUX SIG GND, AUX L CH Test point 1 Audio-navigation unit connector C (20P) No. 8 (BLK) Test point 2 Audio-navigation unit connector C (20P) No. 18 (RED) Test circuit AUX SIG GND, AUX R CH Test point 1 Audio-navigation unit connector C (20P) No. 8 (BLK) Test point 2 Audio-navigation unit connector C (20P) No. 17 (WHT) Is there continuity?
YES
There is a short in the wires between the audio-navigation unit and the auxiliary jack assembly. Replace the affected shielded harness.
NO
The AUX SIG GND wire is not shorted. Go to step 7.
- Open wire check (AUX lines)
-1. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Audio-navigation unit connector C (20P): disconnected Auxiliary jack assembly 5P connector: disconnected Test circuit Test point 1:Audio-navigation unit connector C (20P) Test point 2:Auxiliary jack assembly 5P connector AUX GND No. 6 (YEL) No. 4 (YEL) AUX SIG GND No. 8 (BLK) No. 3 (BLK) AUX DET No. 16 (PUR) No. 5 (PUR) AUX R CH No. 17 (WHT) No. 1 (WHT) AUX L CH No. 18 (RED) No. 2 (RED) Is there continuity?
YES
The AUX wires are OK. Go to step 8.
NO
There is an open in the wire (s) between the audio-navigation unit and the auxiliary jack assembly. Repair or replace the affected harness.
- Auxiliary jack assembly check (substitution)
-1. Substitute a known-good auxiliary jack assembly.
- 2. Reconnect all the connectors, and recheck.
Does the symptom go away?
YES
Replace the original auxiliary jack assembly - Refer to: Auxiliary Jack Assembly Removal and Installation (2014 2015 2016) or Auxiliary Jack Assembly Removal and Installation (2017 2018 2019 2020) .
NO
Replace the audio-navigation unit - Refer to: Audio-Navigation Unit Connector for Inputs and Outputs (2014 2015), or Audio-Navigation Unit Connector for Inputs and Outputs (2016), or Audio-Navigation Unit Connector for Inputs and Outputs (2017), or Audio-Navigation Unit Connector for Inputs and Outputs (2018 2019 2020) .
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.