DTC B1664

WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 2025 Honda Odyssey, 2024 Honda Odyssey, 2023 Honda Odyssey, 2022 Honda Odyssey, and 2021 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.

DTC B1664 : Rear Interior LF Antenna Circuit Open

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A .

DTC Description	DTC
B1664 Rear Interior LF Antenna Circuit Open

DTC (Keyless Access Control Unit)

Problem verification

-1. Clear the DTCs with the HDS.

-2. Select the KEYLESS ACCESS CONTROL UNIT from the ONE-PUSH START system select menu with the HDS, and enter the SELF CHECK.

-3. Do the SELF CHECK.

SELF CHECK

Check for DTCs with the HDS.

DTC Description	DTC
B1664 Rear Interior LF Antenna Circuit Open

Is DTC B1664 indicated?

YES

Go to step 2.

Intermittent failure, the system is OK at this time. Check for loose or poor connections.

EXT R+, EXT R- line output check

-1. Turn the vehicle to the OFF (LOCK) mode.

-2. Disconnect the following connector.

Rear interior LF antenna 2P connector

-3. Turn the vehicle to the ON mode.

-4. Measure the voltage between test points 1 and 2.

Test condition	Vehicle ON mode Rear interior LF antenna 2P connector: disconnected
Test point 1	Rear interior LF antenna 2P connector (female terminals) No. 1:
Test point 2	Rear interior LF antenna 2P connector (female terminals) No. 2:

Courtesy of HONDA, U.S.A., INC.

Is there voltage?

YES

Replace the rear interior LF antenna .

Go to step 3.

Open wire check (EXT R+, EXT R- lines)

-1. Turn the vehicle to the OFF (LOCK) mode.

-2. Connect terminals A and B with a jumper wire.

Terminal A	Rear interior LF antenna 2P connector (female terminals) No. 1:
Terminal B	Rear interior LF antenna 2P connector (female terminals) No. 2:

Courtesy of HONDA, U.S.A., INC.

-3. Disconnect the following connector.

Body control module connector F (36P)

-4. Check for continuity between test points 1 and 2.

Test condition	Vehicle OFF (LOCK) mode Body control module connector F (36P): disconnected Rear interior LF antenna 2P connector: disconnected Rear interior LF antenna 2P connector No. 1 and No. 2: jumped
Test point 1	Body control module connector F (36P) No. 17
Test point 2	Body control module connector F (36P) No. 35

Is there continuity?

YES

The EXT R+ and EXT R- wires are OK. Replace the body control module (Keyless Access Control Unit) .

Repair an open or high resistance in the wire.