Entering the self-diagnostic function

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.

Before doing the self-diagnostic function, check the No. 7 (10 A) fuse and the No. 21 (7.5 A) fuse in the under-dash fuse/relay box.

Push and hold the SEL RESET button.
Turn the headlights ON.
Turn the ignition switch ON (II).
Within 5 sec, turn the headlights OFF, then ON and OFF again.
Within 5 sec, release the SELECT button, and then push and release the button three times repeatedly.
NOTE:
- While in the self-diagnostic mode, the dash lights brightness controller operates normally.
- While in the self-diagnostic mode, the SELECT button is used to start the Beeper Drive Circuit Test and the Gauge Drive Circuit Check.
- If the vehicle speed exceeds 1.2 mph (2 km/h) or the ignition switch is turned to LOCK (0), the self-diagnostic mode ends.
  
  Fig 1: Blinking Pattern - Ignition Switch (Self-Diagnostic Mode)
  Courtesy of AMERICAN HONDA MOTOR CO., INC.