Control Unit Input Test/Replacement

Remove the passenger's dashboard undercover (see GLOVE BOX DAMPER REPLACEMENT )
Remove the HFL control unit screws, then disconnect the 28P connector (A) from the HandsFreeLink control unit (B)

Fig 1: Identifying 28P Connector And Handsfreelink Control Unit
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Inspect the connector and socket terminals for a good pinfit to be sure they ate 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

POSSIBLE CAUSE RESULT REFERENCE

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 1 V	Poor ground (G401) An open in the wire
15	WHT	Under all conditions	Measure the voltage to ground There should be battery voltage	Blown No 15 (10 A) fuse in the under-hood fuse/relay box An open in the wire
16	PUR	Ignition switch in ACC (I) or ON (II)	Measure the voltage to ground There should be battery voltage	Blown No 18 (7 5 A) fuse in the driver's under-dash fuse/relay box An open in the wire

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

POSSIBLE CAUSE RESULT REFERENCE

Cavity	Wire	Test condition	Test Desired result	Possible cause if result is not obtained
17	BLU	Under all conditions	Check for continuity between No 17 terminal and the passenger's under-dash fuse/relay box connector D (28P) No 14 terminal There should be continuity	An open in the wire
17	BLU	Passenger's under-dash fuse/relay box connector D (28P) disconnected	Check for continuity to ground There should be no continuity	Short to ground
18	PNK	Under all conditions	Check for continuity between No 18 terminal and the passenger's under-dash fuse/relay box connector D (28P) No 13 terminal There should be continuity	An open in the wire
18	PNK	Passenger's under-dash fuse/relay box connector D (28P) disconnected	Check for continuity to ground There should be no continuity	Short to ground