Immobilizer indicator blinks

WARNING: This page is about a different car, the 2009 Acura MDX, 2008 Acura MDX, and 2007 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Before troubleshooting, check the items listed in "General Check before Troubleshooting".

Turn the ignition switch to LOCK (0).
Connect the HDS, then turn the ignition switch ON (II).
Enter the IMMOBILIZER, then select the IMMOBILIZER SETUP.
Check the SYSTEM CHECK and STATUS LOG information.
Is the SYSTEM CHECK indicated?

YES - Troubleshoot the immobilizer system according to the result of the SYSTEM CHECK/ STATUS LOG (see SYSTEM CHECK ).

NO - Go to step 5.
Turn the ignition switch to LOCK (0).
Enter the vehicle, and remove the ignition key from the ignition switch, then close the all doors.
Operate the keyless transmitter LOCK and UNLOCK several times in the vehicle.
Do the door lock actuators work normally?

YES - Go to step 8.

NO - Check for a poor ground (G101) and/or an open in the wire between the immobilizer-keyless control unit 7P connector No. 7 terminal and PCM connector A (49P) No. 41 terminal.
Turn the ignition switch ON (II).
Measure the voltage between the immobilizer-keyless control unit 7P connector No. 2 terminal and body ground.

Fig 1: Identifying Voltage Between Immobilizer-Keyless Control Unit 7P Connector No. 2 Terminal And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES - Go to step 10.

NO - Check No. 19 (20 A) fuse in the under-dash fuse/relay box or for an open in the BRN wire between the under-dash fuse-relay box and the immobilizer-keyless control unit.
Measure the voltage between the immobilizer-keyless control unit 7P connector No. 7 terminal and body ground.

Fig 2: Identifying Voltage Between Immobilizer-Keyless Control Unit 7P Connector No. 7 Terminal And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there less than 0.5 V?

YES - Replace the immobilizer-keyless control unit.

NO - Check for a poor ground (G101) and/or repair poor connection or open between the immobilizer-keyless control unit 7P connector No. 7 terminal and PCM connector A (49P) No. 41 terminal.