Keyless Buzzer Circuit Troubleshooting

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2020 Honda Fit, 2019 Honda Fit, 2018 Honda Fit, 2017 Honda Fit, and 2016 Honda Fit. However, it is still accessible from the selected car via links, so may be relevant.

Open wire check (GND line):

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

- 2. Disconnect the following connector.

Keyless buzzer 3P connector

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

Test condition	Vehicle OFF (LOCK) mode. Keyless buzzer 3P connector: disconnected.
Test point 1	Keyless buzzer 3P connector No. 3
Test point 2	Body ground

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

Is there continuity?

YES

The GND wire is OK. Go to step 2.

Repair an open or high resistance in the ground wire or poor ground (G503).

Open wire check (SMART BUZZER line):

- 1. Disconnect the following connector.

Under-dash fuse/relay box connector D (24P)

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

Terminal A	Keyless buzzer 3P connector No. 2
Terminal B	Body ground

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

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

Test condition

Vehicle OFF (LOCK) mode.
Keyless buzzer 3P connector: disconnected.
Keyless buzzer 3P connector: jumped to body ground
Under-dash fuse/relay box connector D (24P)

Test point 1	Under-dash fuse/relay box connector D (24P) No. 19
Test point 2	Body ground

Is there continuity?

YES

The SMART BUZZER wire is not open. Go to step 3.

Repair an open or high resistance in the wire.

Shorted wire check (SMART BUZZER line):

- 1. Remove the jumper wire.

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

Test condition

Vehicle OFF (LOCK) mode.
Keyless buzzer 3P connector: disconnected.
Under-dash fuse/relay box connector D (24P)

Test point 1	Under-dash fuse/relay box connector D (24P) No. 19
Test point 2	Body ground

Is there continuity?

YES

Repair a short to ground in the wire.

The SMART BUZZER wire is OK. Go to step 4.

Keyless buzzer check (substitution):
- 1. Substitute a known-good keyless buzzer .

- 2. Check the keyless buzzer function.

Does the keyless buzzer sound?

YES

Replace the original keyless buzzer .

NO

Faulty MICU, replace the under-dash fuse/relay box .