DTC B1792: HandsFreeLink Control Unit Internal Error

WARNING: This page is about a different car, the 2011 Honda Pilot, 2010 Honda Pilot, and 2009 Honda Pilot. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Check the vehicle battery condition first.

Connect the HDS to the DLC.
Clear the DTCs with the HDS.
Turn the ignition switch to LOCK (0), then back to ON (II).
Check for DTCs with the HDS.
Is DTC B1792 indicated?

YES - Go to step 5.

NO - Intermittent failure, the system is OK at this time. ■
Measure the voltage between HandsFreeLink control unit 28P connector terminals No. 15 and No. 16 individually.
Is there battery voltage?

YES - Go to step 6.

NO - If the +B wire does not have voltage, repair an open in the wire between the No. 23 (10 A) fuse in the under-hood fuse/relay box and the HandsFreeLink control unit. If the ACC wire does not have voltage, repair an open in the wire between the No. 35 (10 A) fuse in the under-dash fuse/ relay box and the HandsFreeLink control unit.
Measure the voltage between HandsFreeLink control unit 28P connector terminal No. 1 and body ground.
Is there 0.2 V or less?

YES - Replace the HandsFreeLink control unit (see HANDSFREELINK CONTROL UNIT REMOVAL/INSTALLATION ). ■

NO -Repair an open or high resistance in the wire between the HandsFreeLink control unit and body ground (G403) (see CONNECTOR TO HARNESS INDEX ). ■

Fig 1: Measuring Voltage Between Handsfreelink Control Unit 28P Connector Terminal No. 1 & Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.