Keyless Access System Symptom Troubleshooting Index

WARNING: This page is about a different car, the 2022 Honda Accord, 2021 Honda Accord, 2020 Honda Accord, 2019 Honda Accord, and 2018 Honda Accord. 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	Symptom troubleshooting	Check all the fuses associated with the system. Poor connections at the body control module Keyless remote Body control module Electric steering lock * Engine start/stop switch Harness/connections
Cannot select ON mode with keyless access, but can select ON mode with the keyless remote touching the engine start/stop switch	Symptom troubleshooting	Body control module LF antenna Keyless remote Low or weak keyless remote battery Harness/connections
Cannot select ON mode with the keyless remote touching the engine start/stop switch, but can select ON mode with keyless access	Check the body control module	Body control module is not registered Body control module MTR CONT line power short * ESL ID mismatch * MTR CONT line open/short * IGN TRX line open/short Harness/connections
The mode changes between ACCESSORY and ON, but it does not change to OFF	Check the body control module Check the TCM (A/T) Check the transmission range switch (CVT) Check the park pin switch (CVT) Check the clutch pedal position switch A (M/T)	Body control module ATP-P line open (A/T, CVT) P-PIN switch line open (CVT) CLUTCH SW (SA) line open (M/T)
The mode changes between ACCESSORY and ON, but it is difficult to change to OFF	Check the body control module Check the gauge control module Check the park pin switch (CVT) Check the clutch pedal position switch A (M/T)	Gauge control module Body control module PCM B-CAN communication line open/short F-CAN communication line open/short Speed signal line open P-PIN switch line open (CVT) CLUTCH SW (SA) line open (M/T)
Engine start/stop switch does not work	Check for DTCs. If any DTC is indicated, go to the DTC troubleshooting	ACC relay circuit Body control module Engine start/stop switch SS1 (+) line short SS2 (-) line short Harness/connections

Symptom	Diagnostic procedure	Also check for
Engine does not crank (power supply is normal)	Check the brake pedal position switch Check the body control module	Body control module STS line open/short Brake pedal position switch STOP SW line open/short
The engine starts but stalls immediately	Symptom troubleshooting	No power to PCM No power to body control module Body control module Gauge control module Electric steering lock * Harness/connections
Keyless access indicator does not go off or does not come on	Symptom troubleshooting	Gauge control module Body control module
Security indicator blinks	Symptom troubleshooting	Gauge control module Body control module PCM Harness/connections
All the doors will not lock and unlock	Symptom troubleshooting	Body control module LF antenna Driver's door lock knob switch Door outer handle touch sensor/lock sensor 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	Symptom troubleshooting	Keyless remote battery dead Keyless remote Body control module Harness/connections B-CAN communication line
The doors will not unlock or lock with the door outer handle touch sensor or lock sensor, but will unlock or lock with the keyless remote	Symptom troubleshooting	Door outer handle touch sensor/lock sensor Body control module Keyless remote Not registered Harness/connections

*: With electric steering lock