DESCRIPTION
Electrochromic day/night rearview mirror automatically changes reflectance to reduce glare from headlights. At night, as glare of headlights from behind increases, mirror will gradually become darker to absorb glare. During daylight or when gearshift lever is in Reverse, mirror will be clear and fully reflective. On some models, driver's side outside mirror will also be an electrochromic day/night mirror that is controlled by inside mirror. On some models, inside rearview mirrors also include a compass.
OPERATION
Day/night mirror(s) use a thin layer of electrochromic material between 2 plates of conductive glass. Two photocell sensors signal levels of light to a logic circuit. A forward-facing photocell sensor measures ambient light levels. A rear-facing photocell sensor measures glare from approaching vehicle headlights. When logic circuit senses more light from the headlight sensor than the ambient light sensor, the electrochromic drive circuit applies voltage to mirror(s). Approximately 1.15 volts is applied to mirror(s) when a large amount of glare is present, causing mirror(s) to darken. Voltage will be reduced to 0.01 volt when both photocells indicate the same light level.
When gearshift lever is put into Reverse, battery voltage is applied to mirror reset terminal. Mirror will gradually change to a clear state for better vision when backing up.
TESTING
Note. To identify connectors and wire colors, see WIRING DIAGRAMS .
DIAGNOSTIC SYSTEM CHECK
- Turn ignition switch to RUN position. Move gearshift lever into Park. Move mirror switch to maximum position, if necessary. Cover ambient light sensor (windshield side of mirror) with a dark cloth. Shine light on headlight sensor (on mirror side). Mirror should gradually darken.
- Move gearshift lever into Reverse. Mirror should gradually lighten to a clear state.
- Move gearshift lever into Park. Mirror should gradually darken.
- Remove cloth and light. Mirror should gradually lighten to a clear state.
- If vehicle is equipped with compass, turn on compass. Compass direction display should be on.
Note. Platform Zone Module (PZM) may also be referred to as Body Control Module (BCM).
AUTOMATIC DAY/NIGHT MIRROR DOES NOT LIGHTEN OR DARKEN PROPERLY
- If diagnostic system check was performed, go to next step. If diagnostic system check was not performed, go to «DIAGNOSTIC SYSTEM CHECK»(/cadillac/eldorado/x-1992-2002/remont/mirrors/#mirror-automatic-daynight__diagnostic-system-check) .
- Disconnect automatic day/night mirror connector. Turn ignition switch to RUN position. Using DVOM, check voltage between automatic day/night mirror harness connector terminal No. 1 (Yellow wire) and ground. If reading is about 12 volts, go to next step. If reading is not about 12 volts, go to step 5).
- Check voltage between automatic day/night mirror harness connector terminals No. 1 (Yellow wire) and No. 2 (Black wire). If reading is about 12 volts, go to next step. If reading is not about 12 volts, go to step 6).
- Replace automatic day/night mirror. See «REARVIEW MIRROR»(/cadillac/eldorado/x-1992-2002/remont/mirrors/#mirror-automatic-daynight__rearview-mirror) under REMOVAL & INSTALLATION. Perform «DIAGNOSTIC SYSTEM CHECK»(/cadillac/eldorado/x-1992-2002/remont/mirrors/#mirror-automatic-daynight__diagnostic-system-check) .
- Repair open or short to ground in Yellow wire between automatic day/night mirror and trunk compartment fuse block. Perform «DIAGNOSTIC SYSTEM CHECK»(/cadillac/eldorado/x-1992-2002/remont/mirrors/#mirror-automatic-daynight__diagnostic-system-check) .
- Repair open in Black wire between automatic day/night mirror and ground. Perform «DIAGNOSTIC SYSTEM CHECK»(/cadillac/eldorado/x-1992-2002/remont/mirrors/#mirror-automatic-daynight__diagnostic-system-check) .
IMPROPER OPERATION IN REVERSE
- If diagnostic system check was performed, go to next step. If diagnostic system check was not performed, go to «DIAGNOSTIC SYSTEM CHECK»(/cadillac/eldorado/x-1992-2002/remont/mirrors/#mirror-automatic-daynight__diagnostic-system-check) .
- Using test light, backprobe between reverse relay terminal D3 (Orange wire) and ground. Reverse relay is located in trunk compartment No. 5 micro relay center, attached to the electronics bay. Backprobe between reverse relay terminal D1 (Orange wire) and ground. If test light illuminates at both terminals, go to next step. If test light does not illuminate at both terminals, go to step 10).
- Remove reverse relay. Cover ambient light sensor (on windshield side of mirror) with a dark cloth. Shine an incandescent light on the headlight sensor (on mirror side). Mirror should gradually darken. Connect a fused jumper wire between reverse relay socket terminals D3 (Orange wire) and C1 (Light Green wire). If mirror returns to a clear state, go to next step. If mirror does not return to a clear state, go to step 8).
- Reinstall reverse relay. Using test light, backprobe between reverse relay terminal D1 (Orange wire) and C3 (Dark Green wire). Put gearshift lever in Reverse. If test light illuminates, go to next step. If test light does not illuminate, go to step 6).
- Replace reverse relay. Perform «DIAGNOSTIC SYSTEM CHECK»(/cadillac/eldorado/x-1992-2002/remont/mirrors/#mirror-automatic-daynight__diagnostic-system-check) .
- Check for open in Dark Green wire between reverse relay and Platform Zone Module (PZM). If circuit is okay, go to next step. If circuit is not okay, go to step 11).
- Replace PZM. See «BODY CONTROL MODULE»(/cadillac/eldorado/x-1992-2002/remont/body-cab-control-systems/#body-control-module) article. Perform «DIAGNOSTIC SYSTEM CHECK»(/cadillac/eldorado/x-1992-2002/remont/mirrors/#mirror-automatic-daynight__diagnostic-system-check) .
- Check for open in Light Green wire between reverse relay and automatic day/night mirror. If circuit is okay, go to next step. If circuit is not okay, go to step 11).
- Replace automatic day/night mirror. See «REARVIEW MIRROR»(/cadillac/eldorado/x-1992-2002/remont/mirrors/#mirror-automatic-daynight__rearview-mirror) under REMOVAL & INSTALLATION. Perform «DIAGNOSTIC SYSTEM CHECK»(/cadillac/eldorado/x-1992-2002/remont/mirrors/#mirror-automatic-daynight__diagnostic-system-check) .
- Repair open or short to ground in Orange wire between reverse relay and engine compartment fuse/relay center (located near left front strut tower). Perform «DIAGNOSTIC SYSTEM CHECK»(/cadillac/eldorado/x-1992-2002/remont/mirrors/#mirror-automatic-daynight__diagnostic-system-check) .
- Repair open in appropriate wire. Perform «DIAGNOSTIC SYSTEM CHECK»(/cadillac/eldorado/x-1992-2002/remont/mirrors/#mirror-automatic-daynight__diagnostic-system-check) .
LEFT OUTSIDE MIRROR DOES NOT FUNCTION PROPERLY
- If diagnostic system check was performed, go to next step. If diagnostic system check was not performed, go to «DIAGNOSTIC SYSTEM CHECK»(/cadillac/eldorado/x-1992-2002/remont/mirrors/#mirror-automatic-daynight__diagnostic-system-check) .
- Disconnect automatic day/night mirror connector. Disconnect left outside mirror connector. Using DVOM, check resistance between automatic day/night mirror harness connector terminal No. 4 (Gray wire) and left outside mirror connector C1 terminal "A" (Gray wire) on models without memory mirrors or terminal "E" (Gray wire) on models with memory mirrors. If resistance is 5 ohms or less, go to next step. If resistance is not 5 ohms or less, go to step 6).
- Check resistance between automatic day/night mirror harness connector terminal No. 5 (Pink/Black wire) and left outside mirror connector C1 terminal "B" (Pink wire) on models without memory mirrors or terminal "F" (Pink wire) on models with memory mirrors. If resistance is 5 ohms or less, go to next step. If resistance is not 5 ohms or less, go to step 7).
- Check resistance between automatic day/night mirror harness connector terminals No. 4 (Gray wire) and No. 5 (Pink/Black wire). If resistance is 5 ohms or less, go to next step. If resistance is not 5 ohms or less, go to step 8).
- Replace left outside mirror face. See «MIRRORS - POWER»(/cadillac/eldorado/x-1992-2002/remont/mirrors/#power-mirror-system) article. Perform «DIAGNOSTIC SYSTEM CHECK»(/cadillac/eldorado/x-1992-2002/remont/mirrors/#mirror-automatic-daynight__diagnostic-system-check) .
- Repair open in Gray wire between automatic day/night mirror and left outside mirror. Perform «DIAGNOSTIC SYSTEM CHECK»(/cadillac/eldorado/x-1992-2002/remont/mirrors/#mirror-automatic-daynight__diagnostic-system-check) .
- Repair open in Pink/Black or Pink wire between automatic day/night mirror and left outside mirror. Perform «DIAGNOSTIC SYSTEM CHECK»(/cadillac/eldorado/x-1992-2002/remont/mirrors/#mirror-automatic-daynight__diagnostic-system-check) .
- Repair short between Gray, Pink/Black and Pink wires between automatic day/night mirror and left outside mirror. Perform «DIAGNOSTIC SYSTEM CHECK»(/cadillac/eldorado/x-1992-2002/remont/mirrors/#mirror-automatic-daynight__diagnostic-system-check) .
REMOVAL & INSTALLATION
| CAUTION | Electrochromic material may irritate eyes and skin. In case of eye contact, rinse thoroughly with water. In case of skin contact, wash thoroughly with soap and water. If material is ingested, consult a physician or poison control center immediately. |
Note. Electrochromic mirror cannot be repaired, and must be replaced as an assembly. DO NOT use ammonia-based cleansers on electrochromic day/night mirrors. Spraying cleansers directly on mirrors is not recommended.
Note. For removal and installation procedure for outside mirror assemblies, see MIRRORS - POWER article.
REARVIEW MIRROR
Note. It is not necessary to use tools or other objects to pry mirror mount or mirror away from windshield. Use of tools may damage mirror, mirror mount or windshield.
Removal
Gain access to mirror wiring harness inside of headliner. Disconnect mirror harness connector. Adjust mirror to full-down position. Grasp mirror with left hand between mirror and windshield. With right hand positioned at other end of mirror, pull mirror away from support. (Scheme 3)
Installation
Center bottom of inside rearview mirror to top of mirror support. Slide mirror onto mirror support keeping mirror parallel to windshield. As mirror mount starts to grip, apply at least 20 lbs. of force to fully seat mirror onto mirror support. A click will be heard when mirror is fully seated. Connect mirror harness connector. Install harness and connector into headliner. (Scheme 3)
