AUTOMATIC DIMMING MIRRORS (WITH Auto High-Beam) (2016 2017 2018)

NOTE:  Before testing, check for B-CAN DTCs. If any B-CAN DTCs are indicated, troubleshoot the indicated B-CAN DTCs first.

1. Turn the vehicle to the ON mode.

2. Measure the voltage between terminal No. 1 and body ground.

• If there is battery voltage, go to step 3.
• If there is no voltage, check for:
• • Blown No. C23 (7.5 A) fuse in the under-dash fuse/relay box.
  • An open or high resistance in the wire.

Courtesy of HONDA, U.S.A., INC.

3. Measure the voltage between terminal No. 4 and body ground.

• If there is less than 0.2 V, replace the rearview mirror. Go to: Rearview Mirror - Removal and Installation .
• If there is voltage more than 0.2 V, check for:
• • An open or high resistance in the ground wire.
  • Poor ground (G501).