Honda Accord: System Description
EX-L, EX-L PZEV models
The automatic dimming Inside mirror has a front-facing lux level sensor (A), rear-facing lux level sensors (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 button (C) Is turned OFF.

Circuit Diagram
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Test/Replacement
EX-L, EX-L PZEV models
1. Remove the cover (A), then disconnect BP connector
(B).
2. Turn the ignition switch to ON (II).
3. Measure the voltage between terminal No. 2 and
body ground.
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See also:
Region Setting
The audio system’s region setting will be lost when the battery is
disconnected or
goes dead.
If the Region Select screen appears, you need to set the region for
the audio
system. Follow th ...
Transmission Number
Transmission Type
88E5: 5-speed Manual
M91 A: 5-speed Automatic
B90A: 5-speed Automatic
Serial Number
1000001-: M91A, B90A
8000001-: 88E5 ...