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Home >> Acura >> 2017 >> ILX >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Anti-Theft Systems >> Security System / Keyless Entry System - Testing & Troubleshooting (Except Hybrid) >> Symptom Troubleshooting Index >> Keyless Access System (2016 2017 2018 2019 2020 2021 2022)
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Keyless Access System (2016 2017 2018 2019 2020 2021 2022)

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. A2-7 (30 A), No. A2-9 (30 A), and No. A29 (10 A) fuses 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 keyless access/TPMS control unit
  • Keyless remote
  • Keyless access/TPMS control unit
  • 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
  • No. A2-7 (30 A), No. A2-9 (30 A), and No. A29 (10 A) fuses 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/TPMS control unit
  • 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 keyless access/TPMS control unit
  • Keyless access control unit is not registered
  • Keyless access/TPMS control unit
  • Not registered
  • Harness/connections
  • IGN TRX line open/short
Engine does not crank (power supply is normal)
  • Check the brake pedal position switch
  • Check the keyless access/TPMS control unit
  • Keyless access/TPMS control unit
  • 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 MICU
  • Keyless access/TPMS control unit
  • Gauge control module
  • Harness/connections
All the doors and the trunk lid will not lock and unlock Symptom troubleshooting
  • Keyless access/TPMS 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

*: Mexico models

Symptom Diagnostic procedure Also check for
Keyless access indicator does not go off or does not come on Symptom troubleshooting
  • Gauge control module
  • Keyless access/TPMS control unit
  • Harness/connections
Immobilizer indicator does not go off or does not come on Symptom troubleshooting
  • Gauge control module
  • Keyless access/TPMS control unit
  • PCM
  • Harness/connections
Engine start/stop switch does not work Check for DTCs. If any DTC is indicated, go to the DTC troubleshooting
  • Accessory relay circuit
  • Keyless access/TPMS control unit
  • Engine start/stop switch
  • SS1 (+) line short
  • SS2 (-) line short
  • Harness/connections
The mode changes between ACC and ON, but it does not change to OFF
  • Check the keyless access/TPMS control unit
  • Check the park pin switch
  • Check the transmission range switch
  • Keyless access/TPMS control unit
  • ATP-P line open
  • Transmission range switch
  • Park pin switch
The mode changes between ACC and ON, but it is difficult to change to OFF
  • Check the keyless access/TPMS control unit
  • Check the gauge control module
  • Check the park pin switch
  • Keyless access/TPMS control unit
  • Gauge control module
  • 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 Symptom troubleshooting
  • Keyless remote battery dead
  • Keyless remote
  • MICU
  • Keyless access/TPMS control unit
  • Harness/connections
  • 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 Symptom troubleshooting
  • Door outer handle touch sensor/lock switch
  • Keyless access/TPMS control unit
  • Keyless remote
  • MICU
  • RF unit
  • Not registered
  • Harness/connections

*: Mexico models