Automatic Dimming Inside Mirror Acura TL IV

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Scheme 22

System Description

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 the glare This dimming function is canceled when the transmission is in reverse, or when the automatic dimming off switch (C) is turned OFF

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Scheme 24

1. Remove the cover (A), then disconnect 7P connector (B)
2. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
3. Measure the voltage between terminal No 2 and body ground If there is less than 0 2 V, go to step 4 If there is more than 0 2 V, check for Open or high resistance in the wire Poor ground (G 401)
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 Blown No 12 (7.5 A) fuse in the driver's under-dash fuse/relay box Open in the wire
5. Measure the voltage between terminal No 3 and body ground with the shift lever in R (reverse) position

1. If there is battery voltage, replace the mirror assembly
2. If there is no voltage, check for

1. Open in the wire
2. Faulty driver's under-dash fuse/relay box
3. Faulty transmission range switch
4. A faulty back-up light switch (M/T)