Immobilizer indicator blinks

WARNING: This page is about a different car, the 2013 Acura MDX, 2012 Acura MDX, 2011 Acura MDX, and 2010 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" (see GENERAL CHECK BEFORE TROUBLESHOOTING ).

Turn the ignition switch to LOCK (0).
Connect the HDS, then turn the ignition switch to ON (II).
From the SYSTEM SELECTION MENU, enter IMMOBI, select IMMOBILIZER SETUP, then select SYSTEM CHECK, NUMBER OF KEYS, and STATUS LOG.
Select the SYSTEM CHECK.
Is SYSTEM CHECK or STATUS LOG indicated?

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

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 all the 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 immobilizer-keyless control unit 7P connector terminal No. 7 and PCM connector A (49P) terminal No. 41.1
Turn the ignition switch to ON (II).
Measure the voltage between immobilizer-keyless control unit 7P connector terminal No. 2 and body ground.

Fig 1: Identifying Immobilizer-Keyless Control Unit 7P Connector IG1 (BRN)
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 immobilizer-keyless control unit 7P connector terminal No. 7 and body ground.

Fig 2: Identifying Immobilizer-Keyless Control Unit 7P Connector LG (BRN)
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there less than 0.2 V?

YES -Replace the immobilizer-keyless control unit.

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