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2005 gmc canyon dash lights not working

Dash lights not working have replaced bcm and headlamp switch & tested wiring-

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6ya6ya
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Posted on Jan 02, 2017

  • 375 Answers

SOURCE: ignition coil - 2005 gmc canyon

Just above each spark plug.

Posted on May 18, 2008

  • 1 Answer

SOURCE: brake light switch

In the 04 models there has been a recall on a part in the brake lights. You can look it up and it gives you a number to call GMC. If you truck is one of the affected models they will replace it for you.

Posted on Jan 28, 2009

  • 3 Answers

SOURCE: front turn signals no longer

have your plug ins changed they have had a lot of trouble out of them

Posted on Jun 18, 2009

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SOURCE: My 2005 GMC Canyons blower motor works only when

I believe your problem is a burned out dropping resistor. I don't know if you will find it under the hood near the heater, or behind the switch, but where ever it is this is most likely your trouble. It will be sometwhere in the line between the switch and the motor feed wire. I hope this helps you fix it.

Posted on Nov 07, 2009

ftw1952
  • 10319 Answers

SOURCE: how do I replace a 2006 gmc canyon brake light

yes you can.... it is a plunger style switch located near the brake pedal inside the car

Posted on Feb 28, 2010

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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

04 Grand Am - Dash and rear running lights do not work sporadically. The SES light comes on but no code generated.


Do you know how to do electrical testing ? How to read a wiring diagram ? The running light's and the dash lights are powered by headlamp switch . When you turn the headlamps to park or headlamps on B+ voltage is sent to the BCM . Check for lose connection at headlamp switch . http://www.bbbind.com/free_tsb.html You can find free wiring diagrams at bbbind.com ! Videos on youtube for basic automotive electrical testing . The headlamp switch is an input to the BCM - body control module , do you know what that is ?

Jan 09, 2017 | 2004 Pontiac Grand Am

1 Answer

99 GMC Sierra headlights & running lights won't work!


Headlights Circuit Description
The headlights are controlled by the body control module (BCM) via the AHL Relay when the headlamp and panel dimmer switch is the AUTO position. When in the AUTO mode, the BCM receives a signal, (voltage) from the ambient light sensor, based on the voltage of the signal of n the sensor the BCM turns the day time running lamp (DRL) lights OFF and the headlights ON. The headlights can also be turned on by placing the headlamp and panel dimmer switch in the head position.
The relay coil is fed by the headlamp and panel dimmer switch or the BCM and the battery B+ buss bar in the underhood bussed electrical center (UBEC). The BCM supplies current to the relay based on the input from the ambient light sensor via CKT 352.
The relay output feeds the LT HDLP and RT HDLP fuses to supply current to the low and high beam lamps on CKT 1340 and CKT 1240. The ground for both the low and high beam lamps is supplied via CKT 524 and CKT 525 to the dimmer switch. The dimmer switch uses CKT 1850 for a ground to G203.
Some circuits are monitored by the BCM, and upon failure may set a DTC.
Park/Side Marker and Tail Lamps
The park/side marker and tail lamps are split between the following 4 fuses:
?€¢
The FR PRK


?€¢
The LR PRK


?€¢
The RR PRK


?€¢
The TRL PRK

These fuses receive voltage from the park lamp relay. When the headlamp and panel dimmer switch is in the auto position, the body control module (BCM) controls the relay by grounding CKT 1080 based on the input of the ambient light sensor. The park LPS fuse supplies battery positive voltage (B+) to the relay at all times.
When the headlamp and panel dimmer switch is in the PARK position, the relay is by passed through the INT PRK fuse. Current flows from the PARK LPS fuse through the headlamp and panel dimmer switch to the INT PRK fuse in order to feed the following fuses:
?€¢
The FR PRK


?€¢
The LR PRK


?€¢
The RR PRK


?€¢
The TRL PRK


Park Lamps Inoperative

Step

Action

Value(s)

Yes

No

1

  1. Turn the ignition OFF.
  2. Connect a scan tool.
  3. Turn the ignition to the ON position.
  4. Using the scan tool, check for any DTCs in the body control module (BCM).

Does the scan tool show any DTCs ?
--
Go to Diagnostic System Check - Body Control System in Body Control System
Go to Step 2

2

  1. Turn the headlamp switch to the park position.
  2. Connect a test lamp from (back probe) terminal B of the headlamp and panel dimmer switch to ground.

Does the test lamp light?
--
Go to Step 4
Go to Step 3

3

Locate and repair the open in CKT 240 (ORN) between the switch and the mid bussed electrical center (MBEC).

Is the repair complete?
--
System OK
--

4

Connect a test lamp from (back probe) terminal A of the headlamp and panel dimmer switch to ground.

Does the test lamp light?
--
Go to Step 6
Go to Step 5

5

Replace the headlamp and panel dimmer switch. Refer to Headlamp Switch Replacement .

Is the repair complete?
--
System OK
--

6

Connect a test lamp from the INT PRK fuse, located in the left bussed electrical center (LBEC), to ground.

Does the test lamp light?
--
Go to Step 7
Go to Step 8

7

Locate and repair the open in CKT 74 (LT BLU) between the MBEC and the UBEC.

Is the repair complete?
--
System OK
--

8

Locate and repair the open in CKT 74 (LT BLU) between the headlamp and the panel dimmer switch and the LBEC.

Is the repair complete?
--
System OK

Aug 11, 2016 | GMC Sierra Cars & Trucks

1 Answer

2006 buick allure , automatic low beams do not come on when key starts car


Headlamps
You can use the headlamps two different ways.
?€¢
Place the headlamp switch in the HEAD position for normal operations


?€¢
Place the headlamp switch in the OFF position for automatic lamp control (ALC) operation. During ALC the low beam headlamps are ON for daytime running lamp (DRL) operation in daylight conditions at reduced intensity or low beam headlamps ON at full intensity with exterior park lamps ON in low light conditions. The ambient light sensor is a light-sensitive transistor that varies its voltage signal to the body control module (BCM) in response to changes in the outside (ambient) light level. When the BCM receives this signal the BCM turns ON just the low beam headlamps at reduced intensity for the daytime running lamp (DRL) operation. A resistor wire is used (CKT312) to reduced the voltage which reduces the light intensity for the DRL's function. The ambient light sensor can also turn ON the low beam headlamps and the exterior lamps for automatic lamp control (ALC). Any function or condition that turns ON the headlamps will cancel the DRL operation (this means no reduced voltage to the low beam lights). Thirty seconds after you start the engine with the headlamp switch in the OFF position, the DRL will perform one of two actions:
?€¢
Illuminate the low beam headlamps at reduced intensity in daylight conditions


?€¢
Illuminate the low beam headlamps and exterior park lamps for low light conditions

The DRL operates when the ignition switch is in the RUN position, the parking brake is not set and the transmission is not in the PARK position When these conditions are met and the DRL ambient light sensor indicates daylight conditions the DRL will illuminate
Should have BCM scanned for DTC'S - diagnostic trouble codes , could have DTC'S stored in memory !
DTC B2645 Ambient Light 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 voltage is between 1.75-4.9 volts, either the DRL will be commanded ON or the ALC will be commanded ON.

  1. Turn ON the headlamps.
  2. Ensure that the headlamp dimmer switch is in the LOW position.
Do both low beam headlamps illuminate?
Is only one low beam headlamp inoperative? YES / NO
IF no
  1. Disconnect the lamps switch assembly.
  2. Install a jumper between the headlamp switch headlamps ON signal circuit and ground.
Do the low beam headlamps illuminate?
Do the low beam headlamps illuminate?
Go to Step 18
Go to Step 7

7

  1. Remove the headlamp module.
  2. Install a fused jumper between battery positive voltage and the switched low beam voltage supply circuit.
Do the low beam headlamps illuminate?
Go to Step 8
Go to Step 11

8

Test for the following in the headlamp module control circuit:
?€¢
An open


?€¢
A poor connection


?€¢
A short to ground

Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?
Go to Step 19
Go to Step 10

9

Inspect for a poor connection at the harness connector of the lamp switch assembly. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?
Go to Step 19
Go to Step 14

10

Inspect for a poor connection at the headlamp module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?
Go to Step 19
Go to Step 15

11

Test for a short to ground in the low beam voltage supply circuit. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?
Go to Step 19
Go to Step 12

12

Inspect for a poor connection at the harness connector of the underhood fuse block. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?
Go to Step 19
Go to Step 17

13

Inspect the inoperative low beam headlamp voltage supply and ground circuit for a high resistance, a short to ground, or an open. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?
Go to Step 19
Go to Step 16

14

Replace the lamp switch assembly. Refer to Headlamp Switch Replacement .
Did you complete the replacement?
Go to Step 19
--

15

Replace the headlamp module. Refer to Relay Replacement in Wiring Systems.
Did you complete the replacement?
Go to Step 19
--

16

Replace the inoperative low beam headlamp. Refer to Headlamp Assembly or Headlamp Bulb Replacement .
Did you complete the replacement?
Go to Step 19
--

17

Replace the underhood fuse block. Refer to Testing for Intermittent Conditions and Poor Connections .
Did you complete the replacement?
Go to Step 19
--

18

Replace the BCM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?
Go to Step 19
--

19

Operate the system in order to verify the repair.
Did you correct the condition?
System OK
Go to Step 3

IF

Sep 30, 2015 | Buick Cars & Trucks

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

Auto lights won't turn off on a 2011 Chevy Traverse even after 10 minutes


Well Jeni there are a few thing's that could be wrong , the headlamp switch , the BCM -body control module -a electronic control module . There are relays involved also ,but don't think there at fault . To be sure you need to do some electrical test to know for sure ! I suggest you take it to a ASE certified repair shop that has the knowledge , tools an service info - wiring diagrams etc.. ! Oh and a scan tool that can extract DTC'S from the BCM there could be a diagnostic trouble code pointing to the problem !
DTC B257A 00: Headlamp Switch Input Signal Mismatch
Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance
Headlamp Switch Off Signal
B257A 00
3
--
--
Park Lamp Switch On Signal
5
4
--
--
Headlamp Switch On Signal
B257A 00
2
--
--
Headlamp Ground
--
2, 3, 4
2
--

1. Headlamps Always On

2. Headlamps Inoperative From Switch

3. Unable To Turn OFF Automatic Headlamps

4. Park Lamps Inoperative From Switch

5. Park Lamps Always On
When the headlamp switch is in the OFF position, the body control module (BCM) receives a ground signal through the headlamp switch OFF circuit and an open signal on the park lamp ON circuit and headlamps ON circuit. When the headlamp switch is in the PARK or HEAD position, the BCM receives an open signal through the headlamp switch OFF circuit and a ground signal through the park lamp ON circuit or headlamp ON circuit.
Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the headlamp switch.
  2. Verify that a test lamp illuminates between the ground circuit terminal 8 and B+.
  3. ?‡'
    If the test lamp does not illuminate, test the ground circuit for an open/high resistance.

  4. Ignition ON, verify the scan tool Auto Hdlp. Disable Sw. parameter is Inactive.
  5. ?‡'
    If not the specified value, test the signal circuit terminal 3 for a short to ground. If the circuit tests normal, replace the BCM.

  6. Verify the scan tool Headlamp Switch parameter is Inactive.
  7. ?‡'
    If not the specified value, test the signal circuit terminal 1 for a short to ground. If the circuit tests normal, replace the BCM.

  8. Verify the scan tool Parklamp Switch parameter is Inactive.
  9. ?‡'
    If not the specified value, test the signal circuit terminal 2 for a short to ground. If the circuit tests normal, replace the BCM.

  10. If all circuits test normal, test or replace the headlamp switch.
If the BCM needs to be replaced , it has to be programmed . The dealer is pretty much the only place to have that done at ! There are other places ,you have to look in the phone book or inquire at local repair shops . Some towns ,city's have mobile repair guy's that do flash programming of modules etc... Good luck hope I gave you some insight on the problem ! I tell people these thing's an it's like they don't believe me , I see they repost the same question . I started working as a Technician in 1984 at a Chevy dealer ship an have worked at Cadillac , Pontiac , GMC dealer ships ! I see all to often people trying to fix these type of problems by just replacing parts not knowing what they are doing an wasting there money an later bring it to the shop anyway ! So I hope you make a good decision an take to a qualified repair person or shop !

Jul 05, 2015 | 2011 Chevrolet Traverse

1 Answer

How do i replace the PK Lamp fuse


In the instrument panel fuse block is a fuse marked PK LAMPS the fuse directly above is a 10 amp fuse ,this is the one you want to check. There is also a relay involved in making the park lights work and the Body control module .The relay is in the same fuse block as the PK LAMP fuse, marked PK LP . Not to sound like I'm talking down to you but do you know what a relay looks like ? The fuse block is Right side of the I/P, behind the access panel. Open the passenger door , at end of the Dash is a panel ,pull it off ,then you'll see fuse box .On the inside of the panel it tells what each fuse and relay is. I'm going add how the park lights work description.
The PARK LAMPS fuse in the instrument panel (I/P) fuse block applies battery positive voltage to both the coil and switch side of the PARK LAMP relay in the I/P fuse block. When the headlamp switch is placed in either the PARK or HEAD position, ground is applied from G202 to the headlamp switch. The headlamp switch then applies the ground through the park lamp switch ON signal circuit to the body control module (BCM). The BCM then applies a ground to the PARK LAMP relay enable circuit. This energizes the PARK LAMP relay, applying battery positive voltage to all the park, tail, marker and license lamps. The park, tail, marker and license lamps are also turned ON when the headlamps are commanded ON by the BCM for low light operation. Good luck !

Dec 23, 2014 | 2005 Pontiac Grand Prix

1 Answer

Dash light sometimes fail to come on at night


hello
you could have a bad light switch, and the rheostat that operates the dash lights may not always work if weak connection.also the wiring may have gotten hot and the contact to the wiring is intermittent, check close to the switch connector to see if the wiring has turned colors from heat ? if so then you will have to change the connector with the electrical ends and the light switch.

Jul 01, 2014 | 2005 GMC Canyon

1 Answer

99 GMC Jimmy DRL, headlights, and High beams not working amber lights work.


headlights control by headlamp driver module relay to the BCM and the light sensor on dash next to the winshield defrost vents.headlights also control by high beam relay.

Nov 18, 2013 | 1999 GMC Jimmy

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