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.

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HOMESERVICE MANUALSACURA2015RLXREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTENTERTAINMENT SYSTEMSAUDIO-NAVIGATION SYSTEM - DIAGNOSTICS (EXCEPT HYBRID)AUDIO-NAVIGATION SYSTEM DTC TROUBLESHOOTINGDTC 2705 (WITHOUT ACURALINK)

2015 Acura RLX

DTC 2705 (Without AcuraLink)

2015 Acura RLXSECTION DTC 2705 (Without AcuraLink)

DTC 2705 : HFL Diag

NOTE:

Check the vehicle battery condition first .
This navigation DTC sets when NG is indicated in the HFL diagnosis (the HFL icon is red in the System Links).
Check any official Honda service website for more service information about the navigation system.
Before you troubleshoot, make sure to follow the General Troubleshooting information .
Check the connectors for poor connections or loose terminals.

Problem verification
-1. Clear the hard error codes .

-2. Turn the vehicle to the OFF (LOCK) mode.

-3. Wait for at least 2 minutes.

-4. Check for hard error codes .

Is DTC 2705 indicated?

YES

The failure is duplicated, go to step 2.

NO

Intermittent failure, the system is OK at this time.
DTC check
-1. Check for hard error codes .

Is DTC 2601 indicated?

YES

Go to DTC 2601 troubleshooting .

NO

Go to step 3.
HFL diagnosis check
-1. Go into the System Diagnostic Mode, and select the HFL in the Unit Check menu, and check HFL, GA-NET, and USB status .

Are HFL OK, GA-NET OK, and USB OK indicated?

YES

Replace the audio-navigation unit .

NO: HFL B1792 is indicated

Go to DTC B1792 troubleshooting .

NO: HFL NG, GA-NET NG, and USB OK are indicated

Go to step 4.

NO: HFL NG, GA-NET NG and USB NG are indicated

Go to step 5.

Open wire check (GA BUS+ line, GA BUS- line)

-1. Turn the vehicle to the OFF (LOCK) mode.

-2. Disconnect the following connectors.

HandsFreeLink control unit connector A (32P)

Audio-navigation unit connector D (12P)

-3. Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	HandsFreeLink control unit connector A (32P): disconnected
	Audio-navigation unit connector D (12P): disconnected
Test circuit	GA BUS+
Test point 1	Audio-navigation unit connector D (12P) No. 7 (PNK)
Test point 2	HandsFreeLink control unit connector A (32P) No. 13 (PNK)

Test circuit	GA BUS-
Test point 1	Audio-navigation unit connector D (12P) No. 1 (BLU)
Test point 2	HandsFreeLink control unit connector A (32P) No. 12 (BLU)

Courtesy of HONDA, U.S.A., INC.

Is there continuity?

YES

Replace the HandsFreeLink control unit .

There is an open in the wire (s) between the audio-navigation unit and the HandsFreeLink control unit. Replace the affected shielded harness.

Determine possible failure area (GA+B line, others)

-1. Turn the vehicle to the OFF (LOCK) mode.

-2. Disconnect the following connector.

HandsFreeLink control unit connector A (32P)

-3. Measure the voltage between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	HandsFreeLink control unit connector A (32P): disconnected
Test circuit	GA+B
Test point 1	HandsFreeLink control unit connector A (32P) No. 32 (RED)
Test point 2	Body ground

Courtesy of HONDA, U.S.A., INC.

Is there battery voltage?

YES

The GA+B wire is OK. Go to step 8.

Go to step 6.

Open wire check (GA+B line)

-1. Measure the voltage between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	HandsFreeLink control unit connector A (32P): disconnected
Test circuit	GA+B
Test point 1	Audio-navigation unit connector D (12P) No. 12 (RED)
Test point 2	Body ground

Courtesy of HONDA, U.S.A., INC.

Is there battery voltage?

YES

Repair an open in the wire between the audio-navigation unit and the HandsFreeLink control unit.

The GA+B wire is not open. Go to step 7.

Shorted wire check (GA+B line)

-1. Disconnect the following connectors.

Audio-navigation unit connector D (12P)

Tuner unit connector A (12P)

XM receiver connector A (14P) (with XM)

-2. Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
	HandsFreeLink control unit connector A (32P): disconnected
	Audio-navigation unit connector D (12P): disconnected
	Tuner unit connector A (12P): disconnected
	XM receiver connector A (14P) (with XM): disconnected
Test circuit	GA+B
Test point 1	Audio-navigation unit connector D (12P) No. 12 (RED)
Test point 2	Body ground

Courtesy of HONDA, U.S.A., INC.

Is there continuity?

YES

Repair a short to body ground in the wire between the audio-navigation unit and the HandsFreeLink control unit.

Replace the audio-navigation unit .

Determine possible failure area (GA GND line, others)

-1. Reconnect HandsFreeLink control unit connector A (32P) .

-2. Turn the vehicle to the ON mode.

-3. Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
Test circuit	GA GND
Test point 1	HandsFreeLink control unit connector A (32P) No. 16 (BRN)
Test point 2	Body ground

Courtesy of HONDA, U.S.A., INC.

Is there less than 0.2 V?

YES

The GA GND wire is OK. Go to step 10.

Go to step 9.

Open wire check (GA GND line)

-1. Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode
Test circuit	GA GND
Test point 1	Audio-navigation unit connector D (12P) No. 6 (BRN)
Test point 2	Body ground

Courtesy of HONDA, U.S.A., INC.

Is there any voltage?

YES

Replace the audio-navigation unit .

Repair an open or high resistance in the wire between the audio-navigation unit and the HandsFreeLink control unit.

Determine possible failure area (GA SYS ON line, others)

-1. Turn the vehicle to the OFF (LOCK) mode.

-2. Measure the voltage between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode
Test circuit	GA SYS ON
Test point 1	HandsFreeLink control unit connector A (32P) No. 24 (WHT)
Test point 2	Body ground