Control Unit Input Test/Replacement

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2014 Honda Ridgeline, 2013 Honda Ridgeline, 2012 Honda Ridgeline, 2011 Honda Ridgeline, and 2010 Honda Ridgeline. However, it is still accessible from the selected car via links, so may be relevant.

Remove the driver's console side trim (see DASHBOARD CENTER LOWER COVER REMOVAL/INSTALLATION ).
Remove the screws (A), then disconnect the 28P connector (B) from the HandsFreeLink control unit (C).

Fig 1: Identifying HFL Control Unit Screws, 28P Connector And Handsfreelink Control Unit Connector Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Inspect the connector and socket terminals for a good pinfit to be sure they are all making good contact.
- If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.
- If the terminals look OK, Go to step 4.

Reconnect the connector, and make these input tests at the connector.

If any test indicates a problem, find and correct the cause, then recheck the system.
If all the input tests prove OK, Go to step 5.

WIRE TEST CONDITION REFERENCE CHART

Cavity	Wire	Test condition	Test: Desired result	Possible cause if result is not obtained
1	BLK	Under all conditions	Measure the voltage to ground: There should be less than 0.2 V.	Poor ground (G402) An open in the wire
15	WHT	Under all conditions	Measure the voltage to ground: There should be battery voltage.	Blown No. 5 (20 P) fuse in the under-dash fuse/relay box An open in the wire
16	YEL/RED	Ignition switch in ACCESSORY (I) or ON (II)	Measure the voltage to ground: There should be battery voltage.	Blown No. 32 (7.5 A) fuse in the driver's under-dash fuse/relay box An open in the wire

Disconnect the 28P connector again, and make this input test at the connector.

If the test indicates a problem, find and correct the cause, then recheck the system.
If the input test proves OK, the HandsFreeLink control unit is faulty, replace it.

WIRE TEST CONDITION REFERENCE CHART

Cavity	Wire	Test condition	Test: Desired result	Possible cause if result is not obtained
18	YEL	Under all conditions	Check for continuity between terminal No. 18 and the passenger's under-dash fuse/relay box connector X (39P) terminal No. 18: There should be continuity.	An open in the wire
18	YEL	Under-dash fuse/relay box connector X (39P) disconnected	Check for continuity to ground: There should be no continuity.	Short to ground