Question about 2008 Chevrolet Express

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I have 2008 chevy express, the turn signals flash fast, but not able to find a flasher unit. I have checked grounds, bulbs and fuses, all are good

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The BCM - body control module controls turn signals . There is no flasher unit . Your best bet would be to take your vehicle to the dealer !
Turn Signal Lamps
The BCM 3, BCM 5, and BCM 6 fuses located in the underhood fuse block supply battery voltage to the body control module (BCM) for turn signal, hazard lamp, and stop lamp operation. Voltage from the BCM 5 fuse used for the front and rear left turn signals, voltage from the BCM 3 for the right front turn signal, while voltage from the BCM 6 fuse is used for the right rear turn signal. When the turn signal switch is place in either the LEFT or RIGHT position, ground from G303 is applied through the turn signal switch signal circuit to the BCM indicating the turn signal request. In response to this signal, the BCM applies a pulsating voltage to the front and rear turn signal lamps supply voltage circuits cycling the lamps ON and OFF. The BCM also sends a message via GMLAN to the instrument panel cluster (IPC) to cycle the turn signal indicator ON and OFF depending on the position of the turn signal switch.

Ignition ON, observe the scan tool Left Turn Signal Switch parameter while using the turn signal/multifunction switch to turn the left turn signal ON and OFF. The reading should change between Active and Inactive.

Posted on Apr 08, 2017

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2004 chevy blazer . Problem is the horn does not work and turn signal flashes fast on both sides.


Do you know how to do automotive electrical testing ? Do you know what a relay is and how it works ? Turn signals flashing fast , could be aburnt bulb , flasher module .
VEHICLE RELAYS Operation Diagnosis
Turn Signal Lamps
The HAZ LP fuse in the underhood fuse block supplies battery positive voltage to the multifunction hazard switch assembly. The TURN fuse in the IP fuse block supplies Ignition positive voltage to the multifunction turn signal switch assembly. With the ignition switch in the RUN or START position, ignition positive voltage is connected through the multifunction turn signal and hazard switch assembly to the flasher module which is grounded at G205. When the turn signal switch is placed in either the left or right position, the circuit is complete from the flasher module to the turn signal lamps and to ground. The flasher module then sends an on-off voltage signal to either the left or right turn signals and their instrument panel cluster (IPC) indicator. When the hazard switch is activated, all turn signal lamps will flash including both IPC turn indicators. The front turn signals are grounded at G111 and G112. The rear turn signals are grounded at G475 and G422 on the pickup and G450 on the utility.

Aug 26, 2017 | Cars & Trucks

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I have a Chevrolet cobalt and the left turn signal will not work the inside light on dash flashes fast. I have changed the light bulb still doesn't work.


Fast flashing usually indicates that one of the exterior bulbs isn't functioning. You've checked front and rear signal lights, right? If the bulb is good, it could be corrosion in the socket, bad ground, broken wire, etc.

Oct 16, 2015 | 2006 Chevrolet Cobalt

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Tail lights not working


ck fuse for rear taillights tis under the dash lower left of steering wheel. or if you still have the manual look in there under fuses.
also look for a bad ground but i doubt that.. if it's both rear out.
fast flashing well here's a chart with all sorts of info.
Problem What To Do Turn signals light, but do not flash Replace the flasher No turn signals light on either side Check the fuse. Replace if defective.
Check the flasher by substitution.
Check for open circuit, short circuit or poor ground. Both turn signals on one side don't work Check for bad bulbs.
Check for bad ground In both housings. One turn signal light on one side doesn't work Check and/or replace bulb.
Check for corrosion in socket. Clean contacts.
Check for poor ground at socket. Turn signal flashes too fast or too slow Check any bulb on the side flashing too fast. A heavy-duty bulb is probably installed In place of a regular bulb
Check the bulb flashing too slow. A standard bulb was probably installed in place of a heavy-duty bulb
Check for loose connections or corrosion at the bulb socket Indicator lights don't work in either direction Check If the turn signals are working
Check the dash indicator lights
Check the flasher by substitution One Indicator light doesn't light On systems with 1 dash indicator:
- See if the lights work on the same side. Often the filaments have been reversed In systems combining stoplights with taillights and turn signals
- Check the flasher by substitution On systems with 2 Indicators:
- Check the bulbs on the same side
- Check the indicator light bulb
- Check the flasher by substitution
hope this helps. may want to print for future reference. :)
hope this helps.

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1 Answer

No brake, turn signal, or flashers at rear of 2006 chevy express 2500


Sounds like a bad turn signal switch. I bet if you wiggle the turn signal lever while you have your foot on the brake pedal the left and right brake lights ill intermittently work.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Apr 09, 2013 | 2006 Chevrolet Express Cargo

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1994 Chevy C1500 truck. No rear brake lights


Most likely this is a brake light switch issue. Replace switch.

If your emergency flashers don't work, all flasher bulbs are fine, but flashing too fast, then check and replace Hazard light switch.

Oct 29, 2012 | 1994 Chevrolet C1500

1 Answer

My saturn signal light work sometime than go off if it the flasher please tell me there it is in my car


IF TURN SIGNAL LIGHT DONT WORK SOME TIMES.CHECK FOR BLOWED OR LOOSE FUSE.CHECK TURN SIGNAL BULBS AND CHECK BULB SOCKETS FOR CORROSION.CHECK TURN SIGNAL FOR BAD GROUND.USE JUMPER WIRE BETWEEN GROUND SIDE OF THE TURN SIGNAL BULBS AND A GOOD CHASIS GROUND.IF ALL IS GOOD TURN SIGNAL SWITCH IS BAD OR FLASHERS GOING BAD.TURN SIGNAL FLASHER LOCATED ON CENTER CONSOLE SIDE PANEL GRASP THE FLASHER UNIT AND DETACH IT FROM THE FUSE BOX.IF YOU HAVE EARLY MODEL VECHICLE FLASHER UNIT LOCATED AT THE FRONT OF THE FUSE BLOCK.

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2 Answers

Left turn signal flasses real fast but the right is normal. All the bulbs are good. Could it be the flasher?


I think the socket for the light that is not flashing is slightly melted. the contacts are probably not touching the light bulb properly. you might be able to tug on the contacts to make better connect with the bulb

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2 Answers

Blinkers is flashing real fast. Cked fuses and that is not it . What else could it be?


check all the flasher bulbs if one is not working or is faulty the flasher will flash fast change one bulb at a time only,,,,if all the bulbs are good after testing them you need to change the flasher unit as its gone faulty

Aug 14, 2010 | 2007 Chevrolet Avalanche LTZ

1 Answer

Turning signals not working


The way the system works is:
The fuse supplies 12 volts to the flasher unit then leaves the flasher and goes to the turn-signal switch in the steering column.
When you set the turn-signal switch to turn right or left, the switch sends that 12 volts to the front and rear bulbs. The voltage goes through the bulb, lighting the bulb and goes to ground.
If any of these components are not good than the lights will not work.
Check the fuse and make sure it is good, the fuse will be located under the hood at the fuse center.
Let me know if you have a test light and we can proceed from there.
Regards,

May 09, 2009 | 2001 Chevrolet Blazer

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