DTC B1780: HandsFreeLink steering wheel switch line short (with navigation)
WARNING: This page is about a different car, the 2013 Acura MDX, 2012 Acura MDX, 2011 Acura MDX, and 2010 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.
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 engine and turn the steering wheel from lock to lock several times.
- Check for DTCs with the HDS.
Is DTC B1780 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-navigation voice control switch (see VOICE CONTROL SWITCH REPLACEMENT ).
- Disconnect the HandsFreeLink control unit 28P connector (see step 2 under HANDSFREELINK CONTROL UNIT REMOVAL/INSTALLATION ).
- Disconnect the cable reel subharness 20P connector from the cable reel.
- Check for continuity between HandsFreeLink control unit 28P connector terminal No. 2 and body ground.Fig 1: Checking Continuity Between Handsfreelink Control Unit 28P Connector Terminal No. 2 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES -Go to step 10.
NO -Replace the HandsFreeLink control unit (see HANDSFREELINK CONTROL UNIT REMOVAL/INSTALLATION ).
- Disconnect the dashboard wire harness 20P connector from the cable reel.
- Check for continuity between HandsFreeLink control unit 28P connector terminal No. 2 and body ground.Fig 2: Checking Continuity Between Handsfreelink Control Unit 28P Connector Terminal No. 2 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES -Repair a short to body ground in the wire between the HandsFreeLink control unit and the cable reel.
NO -Replace the cable reel (see CABLE REEL REPLACEMENT ).