Automatic Dimming Inside Mirror Acura ZDX I

Scheme 18

System Description

The automatic dimming inside mirror has a front-facing lux level sensor (A), rear-facing lux level sensor (B), and a control unit. The control unit receives signals from each sensor. Based on the difference between the two lux levels (the light outside the vehicle and the light from the headlights of the other vehicle, etc.), the control unit controls the electro-chromic gel to reduce glare. This dimming function is canceled when the transmission is in reverse, or when the automatic dimming off switch (C) is turned OFF and the indicator (D) goes off.

Scheme 19

Test

Rearview Mirror Without Rearview Camera Display (With Navigation)

Scheme 20

1. Check for obstructions (parking stickers, labels, etc.) over the front-facing lux level sensor (A).
2. Disconnect 7P connector (B).
3. Press the engine start/stop button to select the ON mode.
4. Measure the voltage between terminal No. 1 and body ground. If there is battery voltage, go to step 4. If there is no voltage, check for: Blown No. 16 (7.5 A) fuse in the driver's under-dash fuse/relay box. An open or high resistance in the wire.
5. 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. If there is no voltage, check for: An open or high resistance in the wire. Faulty driver's under-dash fuse/relay box. Faulty transmission range switch.
6. Press the engine start/stop button to select the OFF mode.
7. Reconnect the 7P connector (A).
8. Press the engine start/stop button to select the ON mode.
9. Measure the voltage between terminal No. 2 and body ground. If there is less than 0.2 V, replace the rearview mirror (see «REARVIEW MIRROR REPLACEMENT»(/acura/zdx/i-2009-2013/remont/mirrors/#mirrors) ). If there is voltage more than 0.2 V, check for: An open or high resistance in the ground wire. Poor ground (G402).

Rearview Mirror with Rearview Camera Display (Without Navigation)

Scheme 21

1. Remove the roof console (see «ROOF CONSOLE INPUT TEST/REPLACEMENT»(/acura/zdx/i-2009-2013/remont/interiorillumination-lights/#interior-lights) ).
2. Disconnect 12P connector (A) from the roof wire harness (B)
3. Turn the ignition switch to ON (II).
4. Measure the voltage between terminal No. 5 and body ground. If there is battery voltage, go to step 5. If there is no voltage, check for: Blown No. 16 (7.5 A) fuse in the driver's under-dash fuse/relay box. Faulty driver's under-dash fuse/relay box. An open or high resistance in the wire. Faulty IG2 cut relay.
5. Measure the voltage between terminal No. 6 and body ground with the transmission range switch in R position. If there is battery voltage, go to step 6. If there is no voltage, check for: Blown No. 12 (7.5 A) fuse in the driver's under-dash fuse/relay box. An open in or high resistance in the ground wire. Faulty driver's under-dash fuse/relay box. Faulty transmission range switch. Poor ground (G101).
6. Turn the ignition switch to LOCK (0).
7. Reconnect 12P connector, and then measure the voltage between terminal No. 12 and body ground in all ignition switch positions. If there is less than 0.2 V, replace the rearview mirror. If there is more than 0.2 V, check for: An open or high resistance in the ground wire. Poor ground (G401).

See also:
• REARVIEW MIRROR REPLACEMENT
• ROOF CONSOLE INPUT TEST/REPLACEMENT