Question about 1999 Pontiac Grand Am GT

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The DTC is b2575 wat is this - 1999 Pontiac Grand Am GT

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BCM code referring to the automatic headlight control module.

Posted on Feb 06, 2010

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Posted on Jan 02, 2017

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Head lights turns on 2hours after ignition is off 2005 Gmc envoy 4.2 l6


The headlamp driver module (HDM) is an electronic module that provides electrical power to the vehicle low beam headlamps. The HDM is controlled by a pulse width modulated (PWM) ground signal from the body control module (BCM). The BCM determines the desired lamp intensity using the ambient light sensor, multifunction switch and the park brake switch as inputs. In general, the HDM will operate in 1 of 3 modes:
Your best bet have it checked by a qualified repair shop ! May have DTC'S diagnostic trouble codes .
DTC B2575
DTC B2575 Headlamp Control Circuit
When the body control module (BCM) senses a request for headlamp or daytime running lamp (DRL) illumination, the BCM sends a pulse width modulated (PWM) ground signal to the low beam headlamp driver module through the low beam headlamp driver module control circuit. The low beam headlamp driver module will illuminate the headlamps, adjusting the intensity based on the PWM signal received.
DTC B2580 Headlamp High Beam Control Circuit
DTC B2645 Ambient Light Sensor Circuit
The body control module (BCM) monitors the ambient light sensor signal circuit in order to determine if the daytime running lights (DRL) or the auto headlights (ALC) should be turned ON in the AUTO mode. When the BCM senses the ambient light sensor signal voltage is between 1.75-4.9 volts, either the DRL will be commanded ON or the ALC will be commanded ON depending upon the amount of light received by the sensor.

Feb 04, 2017 | 2005 GMC Envoy

1 Answer

No low beam headlights, but high beams work.


Which do you have
Low Beams - High Intensity Discharge (HID) OR
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. I suggest you take an have it diagnosed by an ASE certified repair shop that has a scan tool that can communicate with the BCM .
DTC B2575 00: Headlamp Control Circuit

Mar 15, 2016 | 2008 Chevrolet Avalanche

1 Answer

Why won't the headlamps turn off?


Maybe a stuck relay or bad headlamp switch ! You may have a DTC - diagnostic trouble code stored in the BCM - body control module ! These codes do not turn on the check engine light ! There could be a yellow wrench symbol on the instrument cluster or a service vehicle soon light or a message in the message center if yours has one ! You would need a professional grade scan tool to check for codes in the BCM !
DTC B2578 Headlamp Relay Control Circuit High.
DTC B2577 Headlamp Control Circuit Low.
DTC B2575 Headlamp Control Circuit !
If no codes were found you would need to do some tests ,such as these .
If no codes Headlamp Low or High Beams Always On test

2

  1. Ensure that the ambient light sensor is receiving enough light to simulate daylight conditions.
  2. Place the headlamp switch in the OFF position.
  3. Turn ON the ignition, with the engine OFF.
  4. Turn OFF the ignition.
Do the headlamps operate normally?
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
Go to Step 3

3

Are the headlamps ON with the ignition key ON, and then turn OFF when the ignition key is placed in the OFF position?
Go to Step 4 yes
Go to Step 5 no

4

Test the headlamp relay control circuit of the body control module (BCM) for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 15 yes
Go to Step 10 no

5

Disconnect the headlamp relay. Refer to Relay Replacement in Wiring Systems.
Do the headlamps turn OFF?
Go to Step 8 yes
Go to Step 6 no

6

Disconnect the headlamp switch connector.
Do the headlamps turn OFF?
Go to Step 7 yes
Go to Step 11 no

7

Test the headlamp relay output circuit of the headlamp relay for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 15
Go to Step 9

8

Inspect for poor connections at the harness connector of the headlamp relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems?
Did you find and correct the condition?
Go to Step 15
Go to Step 12

9

Inspect for poor connections at the harness connector of the headlamp switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 15
Go to Step 13

10

Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 15
Go to Step 14
This mite be a problem you would want to leave to a ASE certified Technician who has the tools an knowledge ! Probably could be fix in less then an hour !

Jul 16, 2015 | 2005 Chevrolet Equinox

1 Answer

1998 Oldsmobile Bravada low beams always on


Where do you have the switch off or auto ? Turn them off !
2
Use the scan tool in order to read the body control module (BCM) current trouble codes.
Is DTC B2575, B2577, or B2600 set as a current code?
--
Go to Diagnostic System Check - Body Control System in Body Control System
Go to Step 3
3
Remove the DRL relay from the underhood bussed electrical center (UBEC).
Do the daytime running lamps remain ON??
--
Go to Step 4
Go to Step 5
Check the headlamp power relay in the underhood fuse / relay box !

May 27, 2017 | 1998 Oldsmobile Bravada

1 Answer

B2575


2. Locate and remove the ALC relay from the Underhood Electrical Center (UHEC) .

2. Identify pins 86 and 85 of the UHEC. Install a testlight across these 2 pins. Turn the key on, engine off. Using the scantool command the ALC on. Check the testlight for illumination. It should light.

3. Turn the key off. Using a suitable jumper identify and short together pins 30 and 87. With the headlight switch in the off position, the headlights should light and switch from high to low beam when toggled by the dimmer switch.

4. If the lights work, replace the ALC relay.

Jun 24, 2012 | Pontiac Grand Am Cars & Trucks

1 Answer

Wats the code p1000 on my 2002 jaguar x type


P1000 JAGUAR - On Board Diagnostic System Readiness Test Not Complete, this is known as the OBD2 drive cycle.


Possible causes - The vehicle is new from the factory.
- Battery or Powertrain Control Module (PCM) had recently been disconnected.
- An OBD monitor failure occurred before completion of an OBD drive cycle.
- PCM Detected Trouble Codes (DTC) have recently been cleared with a scan tool.
When is the code detected? If DTC P1000 is triggered after DTCs have been cleared, all engine management OBD diagnostic monitor drive cycles have not been cleared. P1000 JAGUAR Description The On Board Diagnostic (OBD) monitors are performed during the OBD Drive Cycle. P1000 is stored in continuous memory if any of the OBD monitors do not carry out their full diagnostic check.

Feb 18, 2011 | 1999 Jaguar XK8

1 Answer

2000 siversdo B1001 wat are the causes?


DTC B1001 Option Configuration Error

Check this TSB about this code: b1001.pdf

Hope helps (remember rated this).

Jul 13, 2010 | 2001 Chevrolet Silverado 3500

1 Answer

I cleared the three DTC codes previous asked, which were P0088, P0087,nad P2291, re-started the engine and getting a DTC Code P1000 can you tell me what this code is. The three previous codes started when...


P1000- on-board dianostic systems readiness test not complete, 1. obd monitors and drive cycle incomplete 2.keep alive memory(KAM) cleared, wat to do and try. remove power take off fuse(PTO) then cleared the code,disconnect pcm connector and visually check for corrosion

Jun 21, 2010 | 2008 Ford F 250 Super Duty 4WD

1 Answer

I have a landcruiser 2009 and it is giving me a DTC 0705 wat should i do


Call Toyota dealer and see if it is covered under warranty, since your car is a 2009. 0705 is a fault code for Transmission Range Sensor Circuit malfunction (PRNDL Input).

Apr 26, 2010 | 2009 Toyota Land Cruiser

1 Answer

4 wheel drive light in netural will not light up 2 wheel high, 4 wheel high or low


Start with the 4wd switch, replace it. The other alternative is to have it scanned for codes. B2575 will most likely come up. Its for the switch.

Aug 08, 2009 | 2003 Chevrolet Silverado 1500

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