Hyundai Elantra MD/UD: Troubleshooting

Fifth generation (MD/UD; 2011–2016) / Hyundai Elantra MD 2010-2015 Service manual / Body Electrical System / Audio / Troubleshooting

Troubleshooting

Symptom	Suspected area	Repairment
Pressing power switch does not turn on system	Radio receiver power source circuit	R-1
Pressing power switch does not turn on system	LCD module	R-1
Panel switch does not function	Steering pad switch circuit	R-3
	Audio H/U front pcb ass'y	R-1
	Radio receiver power source circuit	R-1
No sound can be heard from speakers	Radio receiver power source circuit	R-1
	Speaker ↔ H/U wiring	R-4
	Speaker input Waveform	R-5
Noise occurs	Proceed to "noise occurs"	R-7
Radio broadcast cannot be received <poor reception>	Proceed to "radio broadcast cannot be received (poor reception)"	R-6
Disc cannot be inserted or is ejected right after insertion	Radio receiver power source circuit	R-1
Disc cannot be inserted or is ejected right after insertion	Proceed to "Disc cannot be inserted or is ejected right after insertion"	R-12
Disc cannot be ejected.	Radio receiver power source circuit	R-1
CD sound skips	CD player	R-13
Illumination for radio receiver does not come on whth light control switch on.	Illumination circuit	R-8
	Head unit display	R-8
	Radio receiver power source circuit	R-1
Display does not dim with light control switch turned on	Illumination circuit	R-9
Power does not turn off	Audio H/U	R-1
Bluetooth voice recognition faulty	Audio H/U	R-1
Bluetooth voice recognition faulty	Mic input	R-10
USB I/F error	Audio H/U	R-1
	Usb device faulty	R-11
	Multimedia terminal connection	R-10
iPod I/F error	Audio H/U	R-1
	Ipod faulty	R-11
	Multimedia terminal connection	R-10
AUX connection error	Audio H/U	R-1
AUX connection error	Multimedia terminal connection	R-10

R-1 : Replace the audio head unit

Check the same problems after replaceing the audio head unit

OK	▶ If Audio is normal operating, replace the audio head unit
NG	▶ Check the vehicle wiring. (Refer to removal procedure. R-2)

R-2 : Check the power connection of audio head unit.

1.	Remove the audio head unit.

Check the specified condition of terminal.

Tester Connection	Condition	Specified Condition
CON-B11 ↔ GND	Always	9~12 V
CON-B12 ↔ GND	Always	9~12 V
CON-B24 ↔ GND	Always	Below 1Ω

▶ Check again after repairing or replacing the Cable harness or Connector.

R-3 : Check the steering wheel remote control

Check the steering wheel remote control connector specification (Refer to "Audio remote control - inspection")

OK	▶ Replace the audio head unit. (Refer to R-1)
NG	▶ Replace the steering wheel remote control switch.

R-4 : Check the wiring harness and connector

Remove the audio head unit

OK	▶ FOR PA-710S

Tester Connection	Condition	Specified Condition
CON-A1 ↔ RL SPK +	Always	Below 1Ω
CON-A10 ↔RL SPK -	Always	Below 1Ω
CON-A2 ↔ FL SPK +	Always	Below 1Ω
CON-A11 ↔ FL SPK -	Always	Below 1Ω
CONA3 ↔ FR SPK +	Always	Below 1Ω
CON-A12 ↔ FR SPK -	Always	Below 1Ω
CON-A4 ↔ RR SPK +	Always	Below 1Ω
CON-A13 ↔ RR SPK -	Always	Below 1Ω
CON-A1, 2, 3, 4, 10, 11, 12, 13 ↔ GND	Always	OPEN

R-5 : Check the wiring harness and connector

1.	Remove the audio head unit

Check the output of audio head unit using the oscilloscope.

OK	▶ FOR PA-710S

Tester Connection	Condition	Specified Condition
CON-A1 ↔ GND	Audio sound is being produced	A waveform synchronized with sound is output
CON-A10 ↔ GND	Audio sound is being produced	A waveform synchronized with sound is output
CON-A2 ↔ GND	Audio sound is being produced	A waveform synchronized with sound is output
CON-A11 ↔ GND	Audio sound is being produced	A waveform synchronized with sound is output
CON-A3 ↔ GND	Audio sound is being produced	A waveform synchronized with sound is output
CON-A12 ↔ GND	Audio sound is being produced	A waveform synchronized with sound is output
CON-A4 ↔ GND	Audio sound is being produced	A waveform synchronized with sound is output
CON-A13 ↔ GND	Audio sound is being produced	A waveform synchronized with sound is output

R-6 : Radio Broadcast cannot be Received (Bad reception)

Check the radio broadcast reception after replacing the audio head unit

OK	▶ If Audio is normal operating, replace the audio head unit

NG	▶ Go to step 2

Check the antenna jack

NG	▶ Check again the radio broadcast reception after connecting the antenna jack

OK	▶ Go to step 3

Check the antenna amp input voltage (Refer to "Antenna - Glass antenna circuit inspection"

NG	▶ Check the antenna amp input voltage (Refer to "Antenna - Antenna cable"

OK	▶ Go to step 4

Check the feeder cable connection (Refer to "Antenna - Antenna cable")

NG	▶ Check again after repairing or replacing the antenna feeder cable.

OK	▶ Go to step 5

5.	Check and repair the glass antenna. (Refer to "Antenna - Glass antenna test")

R-7 : Check that speakers are installed tightly.

NG	▶ Install the speakers tightly.

OK	▶ Go to step 1

Noise source description

Condition in Which Noise Occurs

Noise Type

Depressing accelerator pedal increases noise, and stopping engine stops noise immediately

Generator nosie

When A/C or heater is operating

Blower motor noise

•	When rapidly accelerating on unpaved road

•	When engine switch is turned on (IG)

Fuel pump noise

•	When horn switch is pressed and released

•	When horn switch is pressed and held down

Horn noise

Running engine causes soft noise, and stopping engine stops noise immediately

Ignition noise

Noise occurs synchronously with turn signal flash

Flasher noise

Noise occurs during window washer operation

Washer noise

Running engine causes noise, but stopping engine does not stop noise

Engine coolant temperature sensor noise

When wiper is operating

Wiper noise

When brake pedal is depressed

Stop light switch noise

Other

Static electricity on vehicle

OK	▶ Check the noise source

NG	▶ Check again after replacing the audio head unit

2.	Repair or replace the noise source

R-8 : Check again after replacing the audio head unit

OK	▶ Remove the audio head unit

NG	▶ Go to step 1

Check the input signal of Illumination (+)

FOR PA-710S

Tester Connection	Condition	Specified Condition
CON-A8/H8 ↔ GND	Always	9~16 V
CON-C4 ↔ GND	Always	Below 1Ω

NG	▶ Check the vehicle wiring

OK	▶ Go to step 2

Check the illumination (-) input signal using the oscilloscope

FOR PA-710S

Tester Connection	Condition	Specified Condition
CON-A17/H17 ↔ GND	Always	Check the PWM waveform

NG	▶ Check the vehicle wiring and cluster PWM output.

OK	▶ Go to step 3

3.	Check the vehicle illumination control unit.

R-9: Test after replacing the audio head unit

OK	▶ Replace the audio head unit

NG	▶ Go to step 1

Check the illumination (-) input signal using the oscilloscope

FOR PA-710S

Tester Connection	Condition	Specified Condition
CON-A17/H17 ↔ GND	Always	Check the PWM waveform

Is PWM output waveform changed according to vehicle illumination control ?

NG	▶ Check the vehicle wiring and cluster PWM output module.

OK	▶ Go to step 2

Check the illumination detent input signal.

FOR PA-710S

Tester Connection	Condition	Specified Condition
CON-A9 ↔ GND	Always	LOW<BELOW 1V> : DETENT OFF

NG	▶ Check the vehicle wiring and cluster DETENT output signal

OK	▶ Go to step 3

3.	Check the vehicle illumination control unit.

R-10 : Check the mic input condition.

Tester Connection	Condition	Specified Condition
CON-B10/I10 ↔ MIC+	Always	Below 1Ω
CON-B22/I22 ↔ MIC-	Always	Below 1Ω
CON-B22/I22↔ GND	Always	OPEN

NG	▶ Check the vehicle wiring and B/T mic

OK	▶ Go to step 1

1.	Test again after replacing the B/T mic

R-11 : Test after replacing the audio head unit

OK	▶ Replace the audio head unit

NG	▶ Go to step 1

Test after replacing the multimedia jack.

OK	▶ Replace the multimedia jack .

NG	▶ Go to step 2

Check the multimedia jack connector.

Installation

1. Install the multimedia jack. 2. Connect the multimedia jack connector. 3. Install the console upper cover. ...

Multifunction switch

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