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Which insturment cluster does your's have ? electronic instrument cluster or standard instrument cluster !
Standard insturment cluster - speedo / odometer Speedometer/Odometer
The speedometer and odometer provides speed information based on a speed/distance pulse signal from the vehicle speed sensor (VSS). The VSS is mounted on the speedometer driven gear in the transmission.
Could be the VSS is bad .
The horn system includes the following:
steering wheel control switch harness
steering wheel pad horn switch, which is part of the driver side air bag module. For additional information, refer to Section 501-20B .
The horn is located behind the front bumper mounted to the radiator support.
Is the air bag light lit on the insturment cluster ? If it is the clock spring could be the problem . If not lit check the circuits from the horn relay .
Which headlamps don't work ? Low beams , high beams , both ?
The high beams are inoperative
GO to Pinpoint Test C .
The low beams are inoperative
GO to Pinpoint Test D .
Principles of Operation NOTE: Due to varying wattage ratings and resulting current draw, certain aftermarket headlamp bulbs may cause the lighting control module (LCM) to shut down the short circuit protection, resulting in the low beams becoming inoperative. Verify that the headlamp bulbs meet Ford specifications.
The headlamp system consists of:
two aerodynamic halogen headlamp bulbs and retainers
lighting control module (LCM)
circuit wiring and circuit protection
In normal operation:
With the multifunction switch in the low beam position, power is supplied by the LCM to the low beam elements through the multifunction switch.
With the multifunction switch in the high beam position (forward detent), power is supplied to the high beam elements and to the high beam indicator in the instrument cluster.
When the multifunction switch is pulled toward the steering wheel, the flash-to-pass switch (part of the multifunction switch) is closed and power is supplied to the high beam elements. When the switch is released, they return to low beam operation.
The battery saver feature of the LCM will automatically turn off the courtesy lamps, demand lamps, headlamps, or parking lamps under the following conditions:
The ignition switch is in the OFF position.
The headlamp switch is in parking lamps ON or headlamps ON positions.
After 10 minutes.
The headlamp switch is a multi-position switch.
The positions include OFF, PARK, and HEAD.
With the headlamp switch in the PARK position (first detent), a signal is supplied to the LCM which powers the front parking lamps, the tail lamps, the side marker lamps, and the license lamp.
With the headlamp switch in the HEAD position, power is supplied to the headlamps through the LCM and the multifunction switch.
The panel dim switch (part of the headlamp switch) is located above the headlamp switch. The panel dim switch operates only with the parking lamps or headlamps on.
When the panel dim switch is held in the up position, the instrument panel lighting will progressively brighten.
When the panel dim switch is held in the down position, the instrument panel lighting will progressively dim.
For additional information, refer to Section 413-00 .
Headlamps On Warning Chime
If the headlamp switch is left in either the PARK or HEAD position and the driver door is opened, the LCM will sound a headlamps on reminder chime when the following conditions occur:
The ignition switch is OFF with the ignition key out.
The driver door is ajar.
For additional information, refer to Section 413-09 .
Inspection and Verification
Verify the customer concern by operating the system.
Visually inspect for obvious signs of mechanical and electrical damage.
The switch is bad >
Each headlamp is individually fused so that battery voltage is applied to the individual lamps at all times through circuit 1640 for the LH headlamps and through circuit 1740 for the RH headlamps. When the headlamp switch is in HEAD, the ground is applied directly to headlamp switch through circuit 1750. When the headlamp switch is placed in LOW, ground is applied to the low beam headlamps through circuit 1201. When the headlamp switch is placed in HIGH, ground is applied to the high beam lamps and to the high beam indicator through circuit 1200. The high beam indicator is fused so that battery voltage is applied at all times through circuit 640.
The box you hear the click in is the daytime running lights control module .
Do you know how to do electrical testing using a DVOM- digital volt ohm meter or a test light ?
Low and High Beams Headlamps Inoperative
Was the headlight system check performed?
YES - Go to Step 2
NO - Go to Headlight System Check
Does flash to pass function normally in the headlight system check?
YES - Go to Step 3
NO - Go to Step 7
Does the autolamps low and high beam operate normally?
YES - Go to Step 4
NO - Go to Step 6
Turn the headlamp switch to the Head position and the headlamp dimmer switch to Low position.
Using a test lamp, backprobe between connector C201 terminal W and ground.
Is the test lamp on?
YES - Go to Step 5
NO - Go to Step 6
Repair poor connection or open in circuit 1750 between connector C201 terminal W and S283.
Is the repair complete?
Go to Headlight System Check
Replace the headlamp switch. Refer to Multifunction Turn Signal Lever Replacement - On Vehicle for service procedure.
Is the repair complete?
Go to Headlight System Check
Repair poor connection or open in circuit 1750 between S283 and ground.
Is the repair complete?
Go to Headlight System Check
The headlamps ( high an low ) are controlled by the LCM lamp control module .
Headlamp Dimmer Switch
Under the left side of the IP, on the base of the steering column
Headlights Circuit Description (Buick)
Battery positive voltage (B+) is supplied at all times to the lamp control module (LCM) through the LH underhood fuse block LCM/HDLP circuit breaker via CKT 242 (RED). When the headlamp switch is placed in the ON position, the headlamp switch input to the LCM is grounded via CKT 103 (WHT). The LCM then supplies battery positive voltage (B+) via CKT 12 (TAN) to the following components:
• Left low beam headlamp
• Right low beam headlamp
When the headlamp dimmer switch is placed in the HIGH position, the LCM removes battery positive voltage (B+) from the low beam headlamps. The LCM supplies battery positive voltage (B+) via CKT 11 (LT GRN) to the following components:
• Left high beam headlamp
• Right high beam headlamp
The LCM provides battery positive voltage (B+) to the appropriate headlamps under the following conditions:
• The ignition switch is in the RUN position.
• The ambient light sensor indicates darkness.
The lamp control module (LCM) monitors the ambient light conditions through the ambient light sensor. The ambient light sensor is a variable resistor whose resistance changes as the surrounding ambient light level changes. As the ambient light decreases, the resistance of the ambient light sensor increases. The LCM measures the resistance across the ambient light sensor and determines whether it is day or night.
You can't turn them on manually with the switch . You have the switch set on auto ?
You can use the headlamps in two different ways.
• Place the headlamp switch in the ON position for normal operation.
• Place the headlamp switch in the OFF position for automatic lamp control (ALC). During ALC the high beam headlamps are On at reduced intensity for daytime running lamp (DRL) operation in daylight conditions, or low beam headlamps On in low light conditions.
The DRL/EXT LTS fuse and the EXT lamps fuse in the underhood junction block supply battery positive voltage at all times to both of low beam lamps and to the right high beam lamp. The low beam circuit continues to the high/low beam switch, then, depending on the position of the dimmer switch, connects to the normally-open headlamp relay switch contacts. Placing the headlamp switch in the HEAD position provides a ground path for the headlamp switch input of the Body Control Module (BCM). After receiving this input, the BCM energizes the headlamp relay. When the headlamp relay is energized, the low beam circuit is connected to ground G201. The high beam circuit is divided into a left and a right side circuit.
The DRL/EXT LTS fuse in the underhood ignition block supplies battery positive voltage to both the coil and to the normally-closed contact of the DRL relay switch circuit. During high beam operation, the left side current flow is through the closed contacts of the DRL relay, and to the left high beam lamp.
The EXT Lamps fuse in the top of the engine fuse block supplies battery positive voltage to the right high beam lamp. Both high beam circuits are then connected together, and continue to the dimmer switch. When the driver closes the high beam contacts of the dimmer switch, the circuit is grounded at G201.
Both the headlight switch and the BCM provide a ground, or control circuit, to the headlight relay coil circuit for manual or automatic headlamp operation. When you place the headlamp switch in the OFF position, and the ambient light sensor indicates low light conditions, the BCM energizes the headlamp relay for low beam operation. You may switch the headlights to high beam by pulling the dimmer switch handle toward you until the dimmer switch is activated. When the dimmer switch is placed in the HIGH position, the indicator lamp input to the BCM is pulled low. The BCM then sends a class 2 message to the instrument cluster in order to illuminate the high beam indicator lamp.
If the headlamp switch is left in the head position, the inadvertent power control feature will turn off the headlights 10 minutes after you turn the ignition switch to the OFF position. If you place the headlamp switch in the head position after the ignition switch has been turned OFF, or if the ignition switch is in the ACCY position, the headlights will remain ON until you turn them OFF or until the battery runs dead.
Both your low beam and your high beam is protected by the same fuse, so it makes sense that the fuse is OK if the high beam is working on the passenger side. There are 3 fuses for the headlamps. Fuse #13 in the Battery Junction Box (20 Amp). If this fuse is blown, the headlamp relay will not have any power and neither high nor low beam on either side will work (you will have no headlamps at all) Then there is Fuses #2 and #3 (15 Amp) in the Battery Junction Box. #2 goes to the left low and high beam and #3 goes to the right low and high beam.
The headlamp switch uses a SINGLE CIRCUIT to control BOTH sides at the same time, so if one side works, the switch cannot be the problem. The headlamp relay provides power for fuses #2 and #3 and we alreadyascertained that these fuses must have power since we have working lights on both sides, so the relay cannot be the problem. A replacement bulb has already been tried, so that pretty much leaves us with a bad lamp socket. (Most likely cause) or a bad connection at splice #S122, which is located in the main wiring harness near the breakout for the left headlamp. (RED/BLACK wire)
There could be a fuse for each low beam light either under the hood or under the dash. If not, then prob both low beams are bad.
If you have daytime run lights, the following may be of help.
There is a daytime running light module that controls both low beams and the daytime running lights. The low beam bulbs may be OK. The high beams will work fine as they are not controlled through the module.
It may be possible to disable the daytime run lights by cutting the yellow wire going into the module and then connecting it to ground. Tape off the other end. This will help. Thanks please keep updated.please do rate the solution positively .thank you for using fixya
If the low beam head light relay is fine,and the dimmer switch checks out fine,then look at the out put wire from the dimmer switch to the head light relay,check for voltage,then check the relay to see if it energizes.Then follow the wire(out put)from the relay to the head light.Now if power from the dimmer is getting to the relay,but the relay is not energizing,look for a bad relay,or bad relay ground wire.
in this case make sure you have voltage going to the low beam lights. 12 volts. you need a volt meter. if you do not have volatge you have to check and make sure power is going through the fuse. a bad fuse will be broke, but you can have a good fuse with no power going through it. if you have power going through the fuse you have a wiring open somewhere between fuse and whatever is between the headlight connecter.
plz check and get back i will keep checking on here on and off.