Keyless Access System Symptom Troubleshooting Index (2013-15)

WARNING: This page is about a different car, the 2016 Acura RDX, 2015 Acura RDX, 2014 Acura RDX, and 2013 Acura RDX. 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 .	No. A29 (10 A) fuse in the under-hood fuse/relay box No. B4 (15 A) and No. B31 (10 A) fuses in the under-dash fuse/relay box Poor connections at the power control unit Gauge control module Power 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	Go to keyless access:Symptom Troubleshooting	No. A29 (10 A) fuse in the under-hood fuse/relay box No. B4 (15 A) and No. B31 (10 A) fuses in the under-dash fuse/relay box Keyless access control unit RF 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 backup control unit	Backup control unit is not registered Backup control unit registration 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
Engine does not crank (power supply is normal)	Check the brake pedal position switch Check the power control unit	Power control unit STS line open/short Brake pedal position switch Brake light line open/short
Engine starts but stalls immediately	SYMPTOM TROUBLESHOOTING	No power to PCM No power to MICU S-NET line open/short ESL SW B line open Electric steering lock Harness/fuses

Symptom	Diagnostic procedure	Also check for
All the doors and the tailgate will not lock and unlock	SYMPTOM TROUBLESHOOTING	Keyless access control unit RF 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 (lock is normal) with keyless access or with the keyless remote buttons, or the doors will not lock (unlock is normal) with keyless access or with the keyless remote buttons	SYMPTOM TROUBLESHOOTING	MICU Keyless remote Door outer handle touch sensor/lock switch Door switches
Keyless access indicator does not go off or does not come on	SYMPTOM TROUBLESHOOTING	Gauge control module Keyless access control unit Power control unit Backup control unit PCUKEY line open Harness
Immobilizer indicator does not go off or does not come on	Go to keyless access system:Symptom Troubleshooting	Gauge control module Keyless access control unit PCM
The key-in reminder does not sound	Go to keyless access system:Symptom Troubleshooting	Gauge control module Driver's door switch Keyless access control unit MICU PCUKEY line open Harness
The key-in reminder sounds when in vehicle OFF mode door is open	Go to keyless access system:Symptom Troubleshooting	MICU Power control unit Engine start/stop switch Harness
Engine start/stop switch does not work	Check for DTCs. If any DTC is indicated, go to the DTC troubleshooting	Accessory relay Power control unit Engine start/stop switch SS1 (+) line short SS2 (-) line short Harness
The mode changes between ACC and ON, but it does not change to OFF	Check the power control unit Check the park pin switch Check the transmission range switch	Power control unit ATP-P line open Transmission range switch Park pin switch

Symptom	Diagnostic procedure	Also check for
The mode changes between ACC and ON, but it is difficult to change to OFF	Check the power control unit Check the keyless access control unit Check the backup control unit Check the gauge control module Check the park pin switch	Gauge control module Keyless access control unit Backup control unit Power control unit PCM B-CAN communication line open/short F-CAN communication line open/short Speed signal line open Park pin switch
The doors will not unlock or lock with the keyless remote, but will unlock or lock with the door outer handles	Go to keyless access system:Symptom Troubleshooting	Keyless remote battery dead Keyless remote MICU RF unit Power control unit PCUKEY line short SS1 (+) line short SS2 (-) line short IG1A 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	Go to keyless access system:Symptom Troubleshooting	Door outer handles Keyless access control unit Keyless remote LF antenna MICU RF unit Not registered Harness/fuses