Display Brightness Does Not Change With Dimming Control
- Place ignition switch in ACC position. With headlights on, check dimming of other displays while rotating dimmer switch. If other displays dim, replace EIM. If no displays dim, go to next step.
- With headlights on, check dimming of tripminder while rotating dimmer switch. If tripminder dims, go to step 6). If not, check instrument panel fuse (No. 13). If fuse is okay, go to step 4). If not, go to next step.
- Before replacing fuse, turn ignition off. Using ohmmeter, check for short to ground in White/Light Blue wire (at fuse panel). If shorted, repair White/Light Blue wire. If not, replace fuse.
- Measure input voltage at instrument panel fuse (No. 13). If reading is greater than 10 volts, go to next step. If reading is less than 10 volts, repair White/Light Blue wire at headlight switch as required.
- Check parking light/taillight fuse (No. 4). If fuse is okay, go to step 6). If not, check for short to ground in Light Blue/Red wire. If shorted, repair Light Blue/Red wire. If not, replace fuse.
- Remove EIC/EIM from instrument panel. Disconnect harness connector. Measure rheostat voltage between Light Blue/Red wire (pin No. 2) and ground. Reading should be less than 3 volts with headlights off and greater than 5 volts with headlights on. Go to next step.
- Turn ignition off. Measure voltage changes between White/Light Blue wire (pin No. 16) and ground. With dimmer switch in full counterclockwise position, reading should be battery voltage. With dimmer switch in full clockwise position, reading should be 1/2 battery voltage. If readings are correct, replace EIM. If not, repair White/Light Blue wire between connector and headlight control switch.