Automatic Dimming Inside Mirror: Test

Without Rearview Mirror with Rearview Camera Display 

1. Check for obstructions (parking stickers, labels, etc.) over the front-facing lux level sensor (A).
   Fig 1: Identifying Front-Facing Lux Level Sensor And 7P Connector

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
2. Disconnect 7P connector (B).
3. Turn the ignition switch to ON (II).
4. Measure the voltage between terminal No. 1 and body ground.
   • If there is battery voltage, go to step 5.
   • If there is no voltage, check for:
     • A blown No. 30 (10 A) fuse in the under-dash fuse/relay box.
     • An open or high resistance in the wire.
     • Faulty IG2 cut relay.
     • Faulty under-dash fuse/relay box.
5. Turn the ignition switch to LOCK (0).
6. Reconnect the 7P connector.
7. Turn the ignition switch to ON (II).
8. Measure the voltage between terminal No. 2 and body ground.
   • If there is less than 0.2 V, go to step 9.
   • If there is more than 0.2 V, check for:
     • An open or high resistance in the ground wire.
     • Faulty under-dash fuse/relay box.
     • Poor ground (G601).
9. Measure the voltage between terminal No. 3 and body ground with the transmission range switch in R position.

• If there is battery voltage, replace the rearview mirror (see REARVIEW MIRROR REPLACEMENT ).
• If there is no voltage, check for:
  • A blown No. 21 (7.5 A) fuse in the under-dash fuse/relay box.
  • An open or high resistance in the wire.
  • Faulty under-dash fuse/relay box.
  • Faulty transmission range switch.
  • Poor ground (G101).

With Rearview Mirror with Rearview Camera Display 

1. Check for obstructions (parking stickers, labels, etc.) over the front-facing lux level sensor.
2. Remove the roof console (see ROOF CONSOLE INPUT TEST/REPLACEMENT ).
3. Disconnect 12P connector (A) from the roof wire harness (B)
   Fig 2: Identifying 12P Connector And Roof Wire Harness

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
4. Turn the ignition switch to ON (II).
5. Measure the voltage between terminal No. 5 and body ground.
   • If there is battery voltage, go to step 6.
   • If there is no voltage, check for:
     • A blown No. 30 (10 A) fuse in the under-dash fuse/relay box.
     • An open or high resistance in the wire.
     • Faulty IG2 cut relay.
     • Faulty under-dash fuse/relay box.
6. Turn the ignition switch to LOCK (0).
7. Reconnect the 7P connector.
8. Turn the ignition switch to ON (II).
9. Measure the voltage between terminal No. 12 and body ground.
   • If there is less than 0.2 V, go to step 10.
   • If there is more than 0.2 V, check for:
     • An open or high resistance in the ground wire.
     • Faulty under-dash fuse/relay box.
     • Poor ground (G601).
10. Measure the voltage between terminal No. 6 and body ground with the transmission range switch in R position.
    • If there is battery voltage, replace the rearview mirror (see REARVIEW MIRROR REPLACEMENT ).
    • If there is no voltage, check for:
      • A blown No. 21 (7.5 A) fuse in the under-dash fuse/relay box.
      • An open or high resistance in the wire.
      • Faulty under-dash fuse/relay box.
      • Faulty transmission range switch.
      • Poor ground (G101).