Automatic Dimming Inside Mirror: Test/Replacement

Remove the roof console (see INTERIOR LIGHT SWITCH TEST/REPLACEMENT ).
Disconnect the 3P connector (A) from the automatic dimming inside mirror (B).

Fig 1: Identifying 3P Connector From Automatic Dimming Inside Mirror
Check for continuity between No. 3 terminal and body ground.
- If there is continuity, go to step 4.
- If there is no continuity, check for:
  - An open in the wire.
  - Poor ground (G 503, G601).
Check for voltage between No. 1 terminal and body ground with the ignition switch ON (II).
- If there is battery voltage, go to step 5.
- If there is no voltage, check for:
  - Blown No. 20 (15 A) fuse in the under-dash fuse/relay box.
  - An open in the wire.
Check for voltage between No. 2 terminal and body ground with the ignition switch turned ON (II) and transmission range switch (A/T) or back-up light switch (M/T) in reverse.
- If there is battery voltage, replace the mirror assembly.
- If there is no voltage, check for:
  - An open in the wire.
  - Blown No. 21 (7.5 A) fuse in the under-dash fuse/relay box.
  - Faulty under-dash fuse/relay box.
  - Faulty transmission range switch (A/T) or backup light switch (M/T).