DTC B1779: HandsFreeLink steering wheel switch failure (without navigation)

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN system diagnosis test mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

Connect the HDS to the DLC (see HOW TO CHECK FOR DTCS WITH THE HDS ).
Clear the DTCs with the HDS.
Turn the ignition switch to LOCK (0), then start the vehicle and turn the steering wheel back and forth several times.
Check for DTCs with the HDS.
Is DTC B1779 indicated?

YES -Go to step 5.

NO -Intermittent failure, the system is OK at this time.
Turn the ignition switch to LOCK (0).
Do the HFL switch test (see HFL SWITCH TEST ).
Is the switch OK?

YES -Go to step 7.

NO -Replace the HFL switch (see HFL SWITCH REPLACEMENT ).
Disconnect the HandsFreeLink control unit 28P connector.
Disconnect the HFL switch 5P connector, then connect cable reel connector A (20P) and C (20P).
Turn the ignition switch to ON (II).
Measure the voltage between HFL switch 5P connector terminal No. 3 and body ground.

Fig 1: Measuring Voltage Between HFL Switch 5P Connector Terminal No. 3 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there voltage?

YES -Go to step 13.

NO -Go to step 11.
Turn the ignition switch to LOCK (0).
Check for continuity between HandsFreeLink control unit 28P connector terminal No. 13 and HFL switch 5P connector terminal No. 3.

Fig 2: Checking Continuity Between Handsfreelink Control Unit 28P Connector Terminal No. 13 And HFL Switch 5P Connector Terminal No. 3
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to step 15.

NO -Repair an open in the wire between the HFL switch, the cable reel, and the HandsFreeLink control unit.
Disconnect cable reel connector A (20P).
Measure the voltage between HandsFreeLink control unit 28P connector terminal No. 13 and body ground.

Fig 3: Measuring Voltage Between Handsfreelink Control Unit 28P Connector Terminal No. 13 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there voltage?

YES -Repair a short to power in the wire between the HandsFreeLink control unit and the cable reel.

NO -Replace the cable reel (see CABLE REEL REPLACEMENT ).
Remove the audio unit (see AUDIO UNIT REMOVAL/INSTALLATION ), and disconnect audio unit connector A (24P).
NOTE: Eject all the discs before removing the audio unit to prevent damaging the CD player's load mechanism.
Check for continuity between HFL switch 5P connector terminal No. 2 and audio unit connector A (24P) terminal No. 11.

Fig 4: Checking Continuity Between HFL Switch 5P Connector Terminal No. 2 And Audio Unit Connector A (24P) Terminal No. 11
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Replace the HandsFreeLink control unit (see CONTROL UNIT INPUT TEST/REPLACEMENT ).

NO -Go to step 17.
Substitute a known-good cable reel, and check for continuity between HFL switch 5P connector terminal No. 2 and audio unit connector A (24P) terminal No. 11.

Fig 5: Checking Continuity Between HFL Switch 5P Connector Terminal No. 2 And Audio Unit Connector A (24P) Terminal No. 11
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Replace the original cable reel (see CABLE REEL REPLACEMENT ).

NO -Repair an open in the wire between the audio remote, the HFL switch, and the audio unit.