Keyless Access System Symptom Troubleshooting Index

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.

Symptom	Diagnostic procedure	Also check for
Cannot select ON mode with keyless access and with the keyless remote touching the engine start/stop switch	Cannot select ON mode with keyless access and with the keyless remote touching the engine start/stop switch (With Electric Steering Lock) or Cannot select ON mode with keyless access and with the keyless remote touching the engine start/stop switch (Without Electric Steering Lock)	Check the No. A1 (100 A) and No. A2 (70 A) fuses in the 12 volt battery terminal fuse box Check the No. B21 (15 A) and No. B29 (10 A) fuses in the under-hood fuse/relay box. Check the C32 (15 A) and C3 (10 A) fuses in the under-dash fuse/relay box. Check the No. D1-3 (50 A) fuse in the auxiliary under-dash fuse box. Poor connections at the keyless access control unit Gauge control module Keyless access control unit Electric steering lock^* Engine start/stop switch
Cannot select ON mode with keyless access, but can select ON mode with the keyless remote touching the engine start/stop switch	Cannot select ON mode with keyless access, but can select ON mode with the keyless remote touching the engine start/stop switch	Check the No. A1 (100 A) and No. A2 (70 A) fuses in the 12 volt battery terminal fuse box Check the No. B21 (15 A) and No. B29 (10 A) fuses in the under-hood fuse/relay box. Check the C32 (15 A) and C3 (10 A) fuses in the under-dash fuse/relay box. Check the No. D1-3 (50 A) fuse in the auxiliary under-dash fuse box. Keyless access control unit LF antenna Keyless remote Low or weak keyless remote battery MTR CONT line open/short^* IGN TRX line open/short^*
Cannot select ON mode with the keyless remote touching the engine start/stop switch, but can select ON mode with keyless access	Check the keyless access control unit	Keyless access control unit is not registered Keyless access control unit MTR CONT line power short^* ESLID mismatch^* MTR CONT line open/short^* IGN TRX line open/short^* Not registered Harness/connections

Symptom	Diagnostic procedure	Also check for
The mode changes between ACCESSORY mode and ON mode, but it does not change to OFF (LOCK) mode	Check the keyless access control unit Check the park pin switch Check the transmission range switch Check clutch pedal position switch	Keyless access control unit ATP-P line open Transmission range switch Park pin switch P-PIN SW line open Clutch pedal position switch
The mode changes between ACCESSORY mode and ON mode, but it is difficult to change to OFF (LOCK) mode	Check the keyless access control unit Check the gauge control module Check the park pin switch Check clutch pedal position switch	Gauge control module Keyless access control unit PCM B-CAN communication line open/short F-CAN communication line open/short Speed signal line open Park pin switch P-PIN SW line open Clutch pedal position switch
Engine start/stop switch does not work	Check for DTCs. If any DTC is indicated, go to the DTC troubleshooting	Accessory relay Keyless access control unit Engine start/stop switch SS1 (+) line short SS2 (-) line short Harness
Engine does not crank (power supply is normal)	Check the keyless access control unit Check the brake pedal position switch	Keyless access control unit STS line open/short Brake pedal position switch STOP LT line open/short
The engine starts, but stalls immediately	The engine starts but stalls immediately	No power to PCM No power to MICU S-NET line open/short ESL SW B line open^* Electric steering lock^* Harness/fuses
Keyless access indicator does not go off or does not come on	Keyless access indicator does not go off or does not come on	Gauge control module Keyless access control unit KEY SW line open Harness
Immobilizer indicator does not go off or does not come on	Immobilizer indicator does not go off or does not come on	Gauge control module Keyless access control unit PCM

Symptom	Diagnostic procedure	Also check for
All the doors and the tailgate will not lock and unlock	All the doors and the tailgate will not lock and unlock	Keyless access control unit LF antenna Driver's door lock knob switch Door outer handle touch sensor/lock switch Door lock actuators Keyless remote Low or weak keyless remote battery Not registered
The doors will not unlock or lock with the keyless remote, but will unlock or lock with the door outer handles	The doors will not unlock or lock with the keyless remote, but will unlock or lock with the door outer handles	Keyless remote battery dead Keyless remote MICU Keyless access control unit KEY SW line short SS1 (+) line short SS2 (-) line short IG1-A line short ACC line short B-CAN communication line
The doors will not unlock or lock with the door outer handle touch sensor or lock switch, but will unlock or lock with the keyless remote	The doors will not unlock or lock with the door outer handle touch sensor or lock switch, but will unlock or lock with the keyless remote	Door outer handle touch sensor/lock switch Keyless access control unit Keyless remote LF antenna MICU Not registered Harness/fuses
The key-in reminder does not sound	The key-in reminder does not sound	Gauge control module Driver's door switch Keyless access control unit MICU KEY SW line open Harness
The key-in reminder sounds when in Vehicle OFF (LOCK) mode door is open	The key-in reminder sounds in Vehicle OFF (LOCK) mode when door is open	MICU Keyless access control unit Engine start/stop switch Harness

*: With electric steering lock