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HOMESERVICE MANUALSACURA2023MDX BASEREPAIR AND DIAGNOSISENGINE PERFORMANCEENGINE CONTROL SYSTEMSBODY ELECTRICAL SYSTEM - SYSTEM DESCRIPTION - DTC TROUBLESHOOTING INDEXTESTSKEYLESS ACCESS SYSTEM STATUS LOG
2023 Acura MDX Base

Keyless Access System Status Log

2023 Acura MDX BaseSECTION Keyless Access System Status Log

If you suspect there is an immobilizer system problem, check the status log in the HDS.

1. Connect the HDS to the DLC

2. Turn the vehicle to the ON mode.

3. On the HDS screen, at SYSTEM SELECTION MENU, enter ONE-PUSH START, then select KEYLESS ACCESS CONTROL UNIT or BACKUP CONTROL UNIT.

NOTE:

If the HDS does not communicate, check the body control module power, ground, K-line, and L-line connectors.

4. At KEYLESS ACCESS CONTROL UNIT, enter KEYLESS ACCESS SYSTEM INFORMATION, then select KEYLESS ACCESS STATUS LOG.

5. At BACKUP CONTROL UNIT, enter SYSTEM INFORMATION, then select STATUS LOG. Check the STATUS LOG count. Troubleshoot the status with the highest count first. If no counts are listed, the immobilizer system is OK. Continue with normal symptom troubleshooting.

Status Log (Keyless Access Control Unit) 

Status Log No. Possible cause
B-1B-2
  • PCM was not registered correctly
  • Body control module was registered correctly
  • Poor connections or loose terminals between body control module and PCM
  • Poor connections or loose terminals in the IG1 line
  • Low 12 volt battery voltage
  • Electrical noise
C-1C-2
  • Poor connections or loose terminals in the IG1 line
  • Body control module was not registered
  • Low 12 volt battery voltage
  • Electrical noise
D-1D-2D-3
  • Poor connections or loose terminals between body control module and PCM
  • Low 12 volt battery voltage
  • Electrical noise
  • Blown fuse

Status Log (Backup Control Unit) 

Status Log No. Possible cause
A-1A-2A-3
  • Keyless remote was not registered correctly
  • Engine start/stop switch failure
B-1B-2
  • PCM was not registered correctly
  • Communication error between body control module and PCM
  • Low 12 volt battery voltage
  • Electrical noise
C-1C-2
  • Body control module was not registered correctly
  • Poor connections or loose terminals in the IG1 line
  • Low 12 volt battery voltage
  • Electrical noise
Status Log No. Possible cause
D-1D-2D-3
  • Poor connections or loose terminals between body control module and PCM
  • S-NET line short
  • Low 12 volt battery voltage
  • Electrical noise
  • Blown fuse
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.