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HEADLAMP RANGE CONTROL DEFECTIVE - 2011 Audi Q5

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2007 chev sub head lights wont turn on


Do you know anything about automotive electronics ? Electronic control modules .
Headlamp ON/OFF control is determined by the body control module (BCM) by a signal on the headlamp switch on input circuit when the headlamp switch is in the HEAD position. When the headlamp switch is in the AUTO position, the BCM determines headlamps ON/OFF by the voltage from the ambient light sensor.
If the headlight switch is left in the ON position, the inadvertent power control feature will turn OFF the headlights approximately 10 minutes after the ignition switch is turned to the OFF position. If the driver places the headlight switch in the ON 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 turned OFF or the battery runs dead.
The high beam indicator is illuminated when the instrument cluster receives a GMLAN serial data message from the BCM that the high beams are illuminated.
High Beams
The high beam headlamps receive voltage from the headlamp high relay located in the underhood fuse block. The BCM controls the relay on the headlamp high beam relay control circuit. High beam control is determined by a signal on the headlamp dimmer switch signal circuit from the multifunction switch. When the headlamp dimmer switch signal circuit is grounded, the BCM grounds the headlamp high beam relay control circuit, illuminating the high beam headlamps. The right and left high beam circuits are independent and are fused independently in the underhood fuse block.
Low Beams - Standard
The low beam headlamps receive voltage from the headlamp low beam relay located in the underhood fuse block. The BCM controls the relay on the headlamp low beam relay control circuit. Low beam control is determined by a signal on the headlamp dimmer switch signal circuit from the multifunction switch. When the headlamp dimmer switch signal circuit is open, the BCM grounds the headlamp low beam relay control circuit, illuminating the low beam headlamps. The right and left low beam circuits are independent are fused independently in the underhood fuse block.

Hooking up a factory scan tool an checking DTC'S - diagnostic trouble codes would be the very first step in trouble shooting this problem .
DTC B257A 00: Headlamp Switch Input Signal Mismatch
DTC 2575 00: Headlamp Control Circuit

Jun 30, 2017 | Cars & Trucks

2 Answers

My low beam headlights will not come on! My daylight running lights work during the day and I have high beams but at night I have nothing but high beams ???


Battery positive voltage (B+) is supplied through the LH underhood fuse block LCM/HDLP circuit breaker via CKT 242 (RED) at all times to the following components:
?€¢
Headlamp switch


?€¢
Lamp control module (LCM)


?€¢
Switch of the RH IP fuse block headlamp relay position J

When the headlamp switch is placed in the ON position, battery positive voltage (B+) is supplied via CKT 10 (YEL) to the coil of the headlamp relay position J. The coil is permanently grounded to G201 via CKT 1450 (BLK). The coil is energized and the contacts close providing battery positive voltage (B+) to the headlamp dimmer switch via CKT 1346 (LT BLU). When the headlamp dimmer switch is in the LOW position, battery positive voltage (B+) is supplied via CKT 12 (TAN) to the following components:
?€¢
Left low beam headlamp


?€¢
Right low beam headlamp The LCM provides battery positive voltage (B+) via CKT 1346 (LT BLU) through the headlamp dimmer switch to the 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.
Headlamps Inoperative - Low Beams (Oldsmobile)
This is a lengthy diagnostic flow chart .

1

Did you perform the headlights system check?
--
Go to Step 2
Go to Headlight System Check

2

  1. Disconnect the lamp control module (LCM) connector C1.
  2. Connect a DMM from the LCM connector C1 cavity E (RED) to ground.
Is the voltage within the specified range?
10-15V
Go to Step 3 yes
Go to Step 9 no

3

Use a test lamp in order to backprobe the headlamp switch connector from cavity D (RED) to ground.
Does the test lamp light?
--
Go to Step 4
Go to Step 10

4

  1. Remove the headlamp relay position J from the RH IP fuse block.
  2. Connect a DMM from the headlamp relay position J cavity 30 (RED) to ground.
Is the voltage within the specified range?
10-15V
Go to Step 5
Go to Step 11

5

  1. Place the headlamp switch in the HEAD position.
  2. Connect a DMM from the headlamp relay position J cavity 85 (YEL) to ground.
Is the voltage within the specified range?
10-15V
Go to Step 6 yes
Go to Step 12 no

6

Connect a DMM from the headlamp relay position J cavity 30 (RED) to cavity 86 (BLK).
Is the voltage within the specified range?
10-15V
Go to Step 7 yes
Go to Step 14 no

7

Connect a fused jumper from the headlamp relay position J cavity 30 (RED) to cavity 87 (LT BLU).
Do the low beam headlamps light?
--
Go to Step 15 yes
Go to Step 8 no

8

  1. Leave the fused jumper in place.
  2. Use a test lamp in order to backprobe the headlamp dimmer switch connector C202 from cavity C5 (LT BLU) to ground.
Does the test lamp light?
--
Go to Step 17 yes
Go to Step 16 no
Repair the open in CKT 242 (RED) between S201 and the LCM. Refer to Wiring Repairs in Wiring Systems.
Is the repair complete?
--
Go to Headlight System Check
--

10

Repair the open in CKT 242 (RED) between S201 and the headlamp switch. Refer to Wiring Repairs in Wiring Systems.
Is the repair complete?
--
Go to Headlight System Check
--

11

Repair the open in CKT 242 (RED) between S201 and the RH IP fuse block. Refer to Wiring Repairs in Wiring Systems.
Is the repair complete?
--
Go to Headlight System Check
--

12

Inspect for an open in CKT 10 (YEL) between the headlamp switch and the RH IP fuse block. Refer to Testing for Continuity in Wiring Systems.
Is CKT 10 OK?
--
Go to Step 13
Go to Step 19

13

Replace the headlamp switch. Refer to Instrument Cluster Trim Panel Replacement in Instrument Panel, Gauges and Console.
Is the repair complete?
--
Go to Headlight System Check
--

14

Repair the open in CKT 1450 (BLK) between the RH IP fuse block and S308. Refer to Wiring Repairs in Wiring Systems.
Is the repair complete?
--
Go to Headlight System Check
--

15

Replace the headlamp relay position J in the RH IP fuse block.
Is the repair complete?
--
Go to Headlight System Check
--

16

Repair the open in CKT 1346 (LT BLU) between the RH IP fuse block and the headlamp dimmer switch connector C202. Refer to

17

Inspect for an open in the CKT 12 (TAN) wiring between the headlamp dimmer switch connector C202 and S257. Refer to Testing for Continuity in Wiring Systems.
Is CKT 12 OK?
--
Go to Step 18
Go to Step 19

18

Replace the headlamp dimmer switch. Refer to Dimmer Switch Assembly - Disassemble - Off Vehicle and Dimmer Switch Assembly - Assemble - Off Vehicle in Steering and Column-Tilt.
Is the repair complete?
--
Go to Headlight System Check
--

19

Repair the suspect wiring. Refer to Wiring Repairs in Wiring Systems.
Is the repair complete?
--
Go to Headlight System Check



Sep 06, 2015 | 1998 Oldsmobile 88

1 Answer

Were is headlight low beam relay


It is located in the under hood fuse/relay box . It's non -replaceable ,if bad whole fuse box has to be replaced ! The low beam headlamps may be turned ON in 3 different ways:
?€¢
When the headlamp switch in the HEAD position for normal operations


?€¢
When the headlamp switch is in the AUTO position, for automatic lamp control (ALC)


?€¢
When the headlamp switch is placed in the AUTO position, with the windshield wipers ON in daylight conditions, after a 6 second delay

Battery voltage is applied at all times to the coil and switch sides of the LOW BEAM PCB Relay located in the underhood fuse block. When the headlamp switch is placed in the HEAD position, ground from G202 is applied through headlamps ON switch signal circuit to the body control module (BCM), signaling the headlamps ON request. In response to this signal, the BCM applies ground through the headlamp low beam relay control circuit energizing the low beam relay. With the relay energized, battery voltage is applied through the switch side of the relay, the left and right low beam fuses, and the low beam supply voltage circuits illuminating the low beam headlamps. Ground for the left headlamp is provided at G101 and the right headlamp at G100.
Low Beam Relay Test

  1. Ignition OFF, disconnect the C2 harness connector at the underhood fuse block.
  2. Connect a test lamp between the control circuit terminal A5 and B+.
  3. Ignition ON, command the Low Beams ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
  4. ?‡'
    If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM.


    ?‡'
    If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.

  5. If all circuits test normal, replace the underhood fuse block.
  6. Ignition OFF, disconnect the harness connector at the inoperative low beam headlamp. Test for less than 5.0 ohms between the ground circuit terminal B and ground.
    ?‡'
    If greater than the specified range, test the ground circuit for an open/high resistance.

    Connect a test lamp between the supply voltage circuit terminal A and ground. Ignition ON, command the Low Beams ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    ?‡'
    If the test lamp is always ON, test the supply voltage circuit for a short to voltage. If the circuit tests normal, replace the underhood fuse block.


    ?‡'
    If the test lamp is always OFF, test the supply voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the underhood fuse block.

    If all circuits test normal, test or replace the low beam headlamp.

Jun 10, 2015 | 2006 Chevrolet Chevrolet Impala LS

1 Answer

How do I fix my 99 blazer the dome lights won't turn on and the 4 who drive won't light up or work


In the instrument panel fuse box fuse # 8 CTSY LP 10A ,that's for the dome lights, fuse panel is left side of IP. What are you talking about 4 who drive won't light up or work ? 4 wheel drive ? Do you have two speed automatic or two speed selectable ?
Switch Indicator Lamps Do Not Light - One or More ? Check fuse #15 IP fuse box 10A 4WD . This is for two speed auto !

Circuit Description

The indicator lamps circuits consist of 5 individual lamps contained inside the mode/range switch assembly, they are AUTO, 4WD, 2HI, 4HI, 4LO and NEUTRAL. The AUTO, 4WD, 2HI, 4HI, and 4LO lamps are contained inside their respective range button. When the ignition is ON, the transfer case shift control module illuminates the indicator lamp that corresponds to the current ATC gear position by providing a ground through a current limiting driver.
The transfer case shift control module flashes each indicator lamp after a shift has been requested and will continue to flash until the transfer case shift control module can complete the shift. After a shift to AUTO, 4WD, 2HI, 4HI, or 4LO is made, the transfer case shift control module will flash that indicator lamp until the transfer case shift control module receives a high voltage signal on CKT 1695 from the front axle switch.
A solid state circuit located inside the switch supplies ignition voltage to the lamps. The solid state circuit also receives voltage whenever the headlamp switch is in park or headlamp position. When the solid state circuit receives voltage from the headlamp switch it will reduce the voltage that it supplies to the indicator lamps, dimming the lamps when the headlamps are ON.

Feb 07, 2015 | Cars & Trucks

1 Answer

Fuse for the alarm system


Here is the full list of fuses for you! and for the car.

Fuses on E-box, on left in Engine Compartment

Fuse 1 - Not assigned

Fuse 2 - 10/15A - Engine control unit

Fuse 3 - 5A - Radiator fan control unit

Fuse 4 - 5/10/15A - Lambda probe heater,
Lambda probe 1 heater after
catalytic converter

Fuse 5 - 10A, 20A - Lambda probe heater1,
Lambda probe 1 heater after
catalytic converter,
Fuel system diagnostic pump,
Charge pressure control solenoid
valve,
Exhaust gas recirculation cooler
change-over valve,
Crankcase breather heater element,
Vacuum pump for brakes

Fuse 6 - 5A, 10A,15A - Fuel system diagnostic pump,
Throttle valve module,
Activated charcoal filter system
solenoid valve 1,
Continued coolant circulation pump,
Auxiliary air heater heating element

Fuse 7 - 20A, 5A - Ignition transformer,
Fuel pressure regulating valve,
Fuel metering valve

Fuse 8 - 10A - Throttle valve module,
Activated charcoal filter system
solenoid valve 1

Fuse 9 - 5A - Automatic glow period control unit,
Electric fuel pump 2 relay,
Fuel pump relay

Fuse 10 - 5A - Speedometer sender,
Brake light switch

Fuse 11 - Not assigned

Fuse 12 - 5A - Coolant circulation pump

Fuse 13 - 5A - Water pump

Fuse 14 - 5A - Engine control unit

Fuse 15 - 30A - Voltage stabiliser

Fuse 16 - 30A - ABS control unit

Fuse 17 - 30A - Automatic gearbox control unit

Fuse 18 - 20A - Automatic gearbox control unit

Fuse 19 - 1A - Onboard supply control unit

Fuse 20 - 30A - Onboard supply control unit (AW0)
Automatic intermittent wash and
wipe relay (AW1)

Fuse 21 - 50A - Secondary air pump motor

Fuse 22 - Not assigned

Fuse 23 - 40A - ABS control unit

Fuse 24 - 50A - Trailer detector control unit

Fuse 25 - 50A - Terminal 15 voltage supply relay 2

Fuse 26 - 60A - Automatic glow period control unit

Fuse 27 - 60A - Radiator fan

Fuse 28 - 40A - Onboard supply control unit (AW1)

Fuse 29 - 40A - Onboard supply control unit (AW1)

Fuse 30 - 50A - Terminal 75 voltage supply relay 1

Fuse 31 - 30A - Amplifier

Fuse 32 - Not assigned

**************************************************

Fuse assignment - Interior Fuse Panel

Fuse 1 - Not used

Fuse 2 - 5A - Electronic steering column lock control module

Fuse 3 - 10A - Instrument cluster control module

Fuse 4 - Not used

Fuse 5 - Not used

Fuse 6 - 10A - Vehicle electrical system control module,
Interior ceiling lights,
Tail lights

Fuse 7 - 5A - Fog lamp relay,
Instrument panel and switch illumination dimmer switch,
License plate lamps,
Vehicle electrical system control module

Fuse 8 - 7.5A - Windshield and headlamp washer pump switch,
Windshield washer pump

Fuse 9 - 5A - Airbag control module

Fuse 10 - 10A - Right steering column switch

Fuse 11 - Not used

Fuse 12 - Not used

Fuse 13 - 5A - Automatic dimming interior rearview mirror,
Light recognition sensor,
Parking aid control module,
Air quality sensor,
High pressure sensor,
Climatronic control unit,
Tire pressure monitoring button,
Back-up lamp switch,
Left washer nozzle heater,
Right washer nozzle heater,
28-pin connector

Fuse 14 4- 10A - Left steering column switch,
ABS control module,
Light switch,
Airbag spiral spring/return spring with slip ring,
Fuel pump control module,
Data bus on board diagnostic interface

Fuse 15 - 10A - 16-pin connector (diagnostic connector),
Instrument panel and switch illumination dimmer switch,
Headlamp range control adjuster,
Auxiliary heater operation relay,
Mass airflow sensor,
Positive crankcase ventilation heating element,
Left front headlamp,
Left headlamp beam adjustment motor,
Right front headlamp,
Right headlamp beam adjustment motor,

Fuse 16 - 10A - Engine control module

Fuse 17 - Not used

Fuse 18 - 15A - Left front headlamp

Fuse 19 - 15A - Right front headlamp

Fuse 20 - 10A - Automatic transmission control module,
Selector lever sensor system control module,
Tiptronic switch,
Climatronic control unit,
Ignition/starter switch

Fuse 21 - Not used

Fuse 22 - 10A - Ignition/starter switch,
Converter box,
Alarm horn,
Interior monitoring sensor,
Alarm horn relay,
Dual tone horn relay

Fuse 23 - 10A - Vehicle electrical system control module,
16-pin connector (diagnostic connector),
Light switch,
Rain/light recognition sensor,
Compass magnetic field sensor,

Fuse 24 - 10A - Vehicle electrical system control module,
Access/start authorization control module

Fuse 25 - 15A - Automatic transmission control module,
Selector lever sensor system control module,
Multifunction transmission range switch

Fuse 26 - 15A - Brake system vacuum pump

Fuse 27 - Not used

Fuse 28 - 40A - Auxiliary heater operation relay

Fuse 29 - 1A - Vehicle electrical system control module,

Fuse 30 - 20A - Cigarette lighter,
12 V socket,
12 V socket 2,
Blocking diode

Fuse 31 - 30A - Light switch

Fuse 32 - 20A - Light switch

Fuse 33 - 40A - Heater/heat output switch,
Fresh air blower relay,
A/C control module,
Fresh air blower switch

Fuse 34 - 15A - Left front headlamp,
Left front headlamp,
Instrument cluster control module

Fuse 35 - 10A - Steering column electronics control module,
Instrument cluster control module,
Signal horn activation,
Data bus on board diagnostic interface

Fuse 36 - 25A - Vehicle electrical system control module

Fuse 37 - 15A - Left front headlamp DRL

Fuse 38 - 15A - Right front headlamp DRL

Fuse 39 - 15A - Low beam relay

Fuse 40 - 15A - Towing recognition control module

Fuse 41 - 15A - Towing recognition control module

Fuse 42 - 20A - Towing recognition control module

Fuse 43 - 30A - Front passenger door control module

Fuse 44 - A25 - Rear window defogger relay,
Vehicle electrical system control module

Fuse 45 - 30A - Driver door control module,
Front passenger door control module

Fuse 46 - 30A - Left rear door control module,
Right rear door control module

Fuse 47 - 15A - Fuel pump control module,
Fuel pump relay,
Fuel primer relay

Fuse 48 - 20A - Vehicle electrical system control module,
Vehicle electrical system control module,
Vehicle electrical system control module,

Fuse 49 - 20A - Climatronic control unit,
A/C control module

Fuse 50 - 30A - Front seat heating control module

Fuse 51 - 30A - Power sunroof control module

Fuse 52 - 20A - Dual tone horn relay

Fuse 53 - 15A - Front seat heating control module

Fuse 54 - 15A - Fog lamp relay

Fuse 55 - 20A - Light switch,
Left steering column switch

Fuse 56 - Not used

Fuse 57 - 15A - Radio,
Radio/navigation display unit control module

Fuse 58 - 1A, 30A - Telephone transceiver
DC/AC converter with socket, 12V-230V

Fuse 59 - 30A - Amplifier

Fuse 60 - 30A - Auxiliary heater control module


Hope this helps

--N

May 31, 2014 | 2010 Volkswagen Jetta

1 Answer

Why The back lights wont turn on, is a 1997 Ford Explorer Eddie Bauer?


If by "back lights" you are referring to the backup lights and 10A FUSE 26 in the interior fuse panel checks OK, the transmission range switch may be defective.

If the park lamps are not working, the headlamp switch or the park lamp relay could be defective.

If the stop lamps are not working, the brake on/off switch could be defective.

May 01, 2014 | 1997 Ford Explorer AWD

2 Answers

Both of my headlights went off. is it the bulbs or fuse?


Well, with the choices you have presented I would have to choose bulbs. Fuses do not cause electrical problems, electrical problems cause blown fuses. So, that automatically eliminates the fuse as the possible cause of your problem.

On the other hand, your problem could be caused by anything from blown bulbs to a defective headlamp control switch to a malfunctioning multiplex control unit or a bad DRL module.

Personally, I would turn the light switch on and check for power and ground at the headlamp bulb connector. If there is power and ground, then the bulb is the cause of the problem. If there is no power and ground, then you must properly diagnose your headlamp circuits to locate the fault.

Dec 23, 2011 | 2002 Honda Accord

1 Answer

How to replace a headlight


please rate, thanks.

SECTION 417-01: Exterior Lighting 2000 Focus Workshop Manual REMOVAL AND INSTALLATION Procedure revision date: 03/6/2003
Headlamp Assembly Removal
All vehicles
  1. Remove the fender splash shield lower retaining screw.
    • Push the fender splash shield to one side.
    e0014434.jpg
  1. Remove the headlamp assembly lower retaining bolt.
    e0022745.jpg
  1. Remove the radiator grille.
    e0010551.jpg
Vehicles built up to 07/1999
  1. Remove the headlamp assembly.
    • Disconnect the headlamp assembly electrical connector.
    e0022744.jpg
Vehicles built 07/1999 onwards
  1. Remove the headlamp assembly.
    • Disconnect the headlamp assembly electrical connector.
    e0030083.jpg
Installation
Vehicles built up to 07/1999
NOTE: Procedure if there is a concern over the formation of condensation inside the plastic headlamp lens or if the plastic headlamp lens is split.
NOTE: It is normal for a small amount of condensation to form on the inside of the plastic headlamp lens, it will disappear when the headlamp is switched on. If the headlamp does NOT dry out after having been switched on for 15 minutes, check the build date of the headlamp. If the build date is between 01.08.98 and 30.09.98, install a new headlamp cover flap.
NOTE: If there is a concern, both headlamps must be removed. Defective headlamps must be renewed and reworking may be necessary. When the headlamp is installed, the number of mounting points must be reduced.
  1. If the headlamp assembly is defective, install a new one.
  1. NOTE: Sometimes the guide pin on the plastic headlamp lens is still present on a new headlamp assembly.
    Cut off the guide pin flush and de-burr as necessary.
    z9921164.jpg
  1. Remove the headlamp levelling motor from the faulty headlamp assembly and install it on the new headlamp assembly. For additional information, refer to Headlamp Leveling Motor - Vehicles Built Up To: 10/2001 in this section.
  1. NOTE: Sometimes there is no hole in the bracket of a new headlamp assembly.
    Do NOT install the retaining bolt any more.
    e0022746.jpg
All vehicles
  1. NOTE: Fix the headlamp assembly in place using the locating pin.
    Install the headlamp assembly upper retaining bolts.
    • Connect the headlamp assembly electrical connector.
    v9710258.jpg
  1. Install the radiator grille.
    e0010551.jpg
  1. NOTE: Fix the headlamp assembly in place using the locating pin.
    Install the headlamp assembly lower retaining bolt.
    v9610258.jpg
  1. Install the fender splash shield lower retaining screw.
    e0014434.jpg
  1. Adjust the headlamps. For additional information, refer to Headlamp Adjustment - in this section. For additional information, refer to Headlamp Adjustment - Vehicles With: High Intensity Discharge Headlamps in this section.

Dec 16, 2010 | 2000 Ford Focus

1 Answer

I own a new German Registered Range Rover SC and would like to take it to the UK. How does one adjust the headlamp beam for left hand drvining?


The auto headlamps can be adjusted in the menu. with vehicle running press the down arrow on the right side control button at the top right steering whell control
menu options will now show on the screen between speedo and tach, scroll to vehicle setup then to headlamp assist then creen comes up high beam assist on, drive on left and drive on right, select drive on left.

Nov 22, 2010 | 2010 Land Rover Range Rover

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