The "bright" lights run, but the "low" beams do not. I have replaced all of the fuses and the Dimmer Relay. The Dimmer Relay makes a loud buzzing noise when the right side turn signal is engaged. The right turn signal indicator stays on. How do I solve this problem?
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Back lighting or warning lights ? check engine , ABS , air bags , seat belt , oil light etc... ?
Interior Lamps Dimming
The second group includes lamps which may be dimmed. This group may use a combination of vacuum fluorescent (VF) illumination and incandescent lamps.
• Power window switches
• HVAC control head assembly
• The instrument panel cluster (IPC)
When the ignition switch is turned to the ON position, the vacuum fluorescent (VF) display (radio) turns on at maximum brightness. When the park lamps are ON all incandescent back lighting turn ON at the dimming level indicated by the IP dimmer switch. At the same time all vacuum fluorescent (VF) displays dim to match the indicated dimming level. When the headlamp switch is placed in the PARK position, the park lamp supply voltage circuit provides an input to the body control module (BCM). The BCM then supplies voltage to the instrument panel dimmer switch through the instrument panel dimming lamps control circuit. The setting of the instrument panel dimmer switch determines the amount of voltage that the instrument panel dimmer switch supplies to the BCM through the instrument panel dimming lamps low reference circuit. The BCM then sends a pulse width modulated (PWM) voltage to all the interior lamps. All the vacuum florescent (VF) and incandescent back lighting lamps are provided a specific voltage and are then grounded. When the headlight switch is turned to the PARK or HEADLAMP position, all incandescent back lighting turn on at the dimming level indicated by the IP dimmer switch. When the IP dimmer switch is moved from MIN to MAX, all vacuum fluorescent (VF) displays, as well as all incandescent back lighting respond from Minimum intensity to maximum brightness in response to the IP dimmer switch.
I would have it checked for DTC'S - diagnostic trouble codes stored in the BCM !
DTC B2624 Display Dimming Input Range/Performance
The body control module (BCM) supplies voltage to the instrument panel dimmer switch through the instrument panel dimmer switch signal circuit. The dimmer switch varies the voltage and returns the new voltage to the BCM through the dimmer switch signal return circuit. The BCM uses this voltage to determine the illumination level of the instrument panel lamps.
DTC B2625 Display Dimming Pulse Width Modulation (PWM) Output Circuit Range/Performance
The body control module (BCM) receives a variable voltage from the instrument panel (I/P) lamp dimmer switch. The BCM uses this signal in order to vary the illumination level of the I/P lamps. The I/P dimming lamps output from the BCM is a pulse width modulated voltage supply used to light the I/P lamps. If a malfunction occurs in the I/P dimming lamps output circuit, this DTC is set.
DTC B2662 Park Lamp Switch Circuit Malfunction
The park lamps are controlled by the turn/headlamp switch. Positive battery voltage is supplied to the switch through the EXT LP fuse. When the turn/headlamp switch is placed in the park or head position, battery voltage is supplied to the park lamps. The body control module (BCM) is also connected to the park lamp circuit to sense whether or not the park lamps turn ON when the low beam or high beam headlamps are turned ON. The BCM also uses the parklamp battery positive voltage to power the instrument panel (I/P) dimmer output circuit. If the BCM senses that the low beam or high beam headlamps are ON and the park lamp input is not active, DTC B2662 sets.
Do the park lamps work ?
Where is the dimmer switch on a 02 ford expedition? You know how to change from low beams to high beams ????? Where you do that at is the dimmer switch . It wouldn't be the dimmer switch , both low beams would be out . Which fuse's did you check ? Did you check fuse #26 10amp ,location - central junction box - inside the vehicle fuse box. ? Do you have daytime running lamps ? 2018 02 trainer SAP version
Free wiring diagrams here http://www.bbbind.com/free-tsb Enter vehicle info. Year , make , model an engine . Under system click on lighting ,then under subsystem click on headlamps . Click the search the button then the blue link .
Did you check the bulb ?
The high and low beam lights use the same power source, so if the low beams work the high beams have power. There is a low and high beam relay controlled by the dimmer switch. If the low beams work and the high beams don't, and the bulbs are good, check the dimmer switch and the high beam relay.
Check the wire circuit for voltage and ground. The top wire is voltage, you can see the wire color, use a test lite, with lights on. The bottom black wire is ground for low beams, chassis ground. You can use test light to check ground, With test light touching voltage, touch ground wire terminal, if the light comes on, at least, the ground is good enough to lite the test light.
Before you do anything else, you should check fuse number 2 (7.5 amp) in your engine compartment fuse box. It is your dimmer relay fuse. Fuse number 1 (20 amp) is your left headlight and fuse number 3 (20 amp) is your right headlight.
If the number 2 fuse is blown, and you replace it, if it blows again, I would have the system checked.
Hope this helps you.