Auto Dimming Mirror Inspection
1. Measure the voltage at each terminal.
If the voltage is not as specified in the Terminal Voltage Table (Reference), inspect the parts under “Inspection item (s)” and related wiring harnesses.
If the system does not work properly even though the inspection items or related wiring harnesses do not have any malfunction, replace the auto-dimming mirror.
Terminal |
Signal name |
Connected to |
Measured condition |
Voltage (V) |
Inspection item(s) |
A |
Power supply (IG1) |
|
Switch the ignition to ON |
B+ |
|
Switch the ignition to Off |
1.0 or less |
||||
B |
R position signal |
Back-up light switch/TR switch |
R position |
B+ |
|
Other than R position |
1.0 or less |
||||
D |
GND |
Body ground |
Under any condition |
1.0 or less |
|
Test yourself
A quick Mazda 3 quiz: every answer comes with an explanation and a link to the manual page.