Question about 2007 Chevrolet Uplander LT Minivan

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When my head lamps are on front signal wont work

When my head lamps are on my front signals wont flash what is the problem

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  • Chevrolet Master
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About the only thing that the headlights and turn signals use together is the ground circuit. They get power from two different circuits.
Could be a ground problem in the harness or one of the connectors.

Posted on Jan 11, 2013

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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MattZiggy
  • 7 Answers

SOURCE: 1997 Suburban

Well it sounds like you have a short circuit somewhere. it apperars to be messing with the relay that you replaced. have you checked all the fuses in your fuse-box? how about all the bulbs on the exterior of the vehicle? try those things then post back.

Posted on Jan 06, 2009

  • 196 Answers

SOURCE: electrical problem

Find the ground wire on one of the lights and add another ground wire to a good clean metal surface and see if that fixes the problem. It defently sounds like a ground problem at one of the lights.

Posted on Jan 07, 2009

  • 1118 Answers

SOURCE: Brake lights dont work, Turn Signals all goofy

First thing i would do is chg. the break light switch, and make sure to chk. all grounds around tailights, sometimes if there is a ground problem it will travel back thru the hot wire to get a ground, witch in turn makes everything go wackey.

Posted on Mar 10, 2009

  • 156 Answers

SOURCE: Rear lights work when turned on. No brake lights

if you're getting a more rapid flash in the front you have a possible blown relay to the back. Check fuses first and see if those are out.

Posted on Mar 23, 2009

  • 93 Answers

SOURCE: Turn signals won't flash

the flashing is genreally controlled by a relay switch in your car. probably the fuse for your relay is blown or your realy itsef might need to be replaed.

Posted on Aug 05, 2009

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The hazard back lights wont quit blinking when car is running even when i pull the fuse on a 2002 buick regal


What fuse are you pulling ?

Hazard Lamps
The hazard warning switch is part of the turn signal switch. The turn signal switch receives battery voltage at all times through the HAZARD SWITCH Fuse. When the hazard switch is placed in the HAZARD position, battery voltage is applied to the hazard lamp/turn signal lamp flasher. The hazard lamp/turn signal lamp flasher sends a turn signal flasher signal to the turn signal switch. The turn signal switch provides all of the turn lamps and turn indicators with the turn signal flasher signal, simultaneously flashing them on and off.

Turn Signal Lamps
The front turn signal lamps are made up of the front park/turn signal lamps and rear turn signal lamps. The front turn signal lamps flash with the rear turn signal lamps when a turn is initiated using the turn signal/multifunction lever. The turn signals will operate only with the ignition switch in the RUN position and will not operate during hazard flasher operation.
When the ignition is turned to the RUN position, battery voltage is supplied to the TURN SIGNAL Fuse. Battery voltage is then applied through the turn signal fuse circuit to the turn signal switch. When the turn signal switch is placed in the LH or RH position, voltage is supplied to the hazard lamp/turn signal lamp flasher. The hazard lamp/turn signal lamp flasher supplies a turn signal flasher signal to the turn signal switch. With the turn signal switch in the LH or RH position the corresponding turn signal indicator, rear turn signal, and front turn signal receive the turn signal switch signal and will flash. The front turn signals receive the turn signal switch signal from the turn signal switch via the BCM. The turn lamps are permanently grounded.

Replace the turn signal switch. Refer to Multifunction, Turn Signal, and Hazard Switch Replacement - On Vehicle in Steering Wheel and Column - Tilt.

Feb 11, 2017 | Buick Cars & Trucks

2 Answers

My rear turn signals are not working. front turn signals work rear parking lights work brake lights work


In the diagram for rear lamp, the top wires are voltage, the bottom black wire is ground. The brown wire on either side should be tail lamps, goes hot when you turn on the headlamp switch. The other top wire on either should be for turn signal. With everything turned on, is there voltage on that wire?
Because the front works and the rear don't, possible wiring circuit problem? The voltage for turn signals comes from bcm. The bcm knows when you turn on turn signal switch, either side, then the bcm sends voltage to turn signal lamp at the rear and front.

rear-turn-signals-not-working-front-nrw1b5lbo1usuvcsnuvurzx3-3-0.jpg

Oct 17, 2016 | 2009 Chevrolet Chevrolet HHR LS

1 Answer

Passenger side turn signal flashes faster but dont work even at day runing light, comes on when head lights are on, replace bulb and socket because was melted but stilldoes the same


Turn Signal Lamps
The turn signal lamps may only be activated with the ignition switch in RUN or BULB TEST position. The T/SIG fuse supplies ignition voltage to the turn signal switch. When the turn signal switch is placed in either the left or right position, the turn signal switch sends an ignition voltage to the hazard lamp/turn signal flasher, which sends an on-off signal to the turn signal switch. When the turn signal switch receives the on-off signal it will send that signal to the following lamps on the LH or RH side:
?€¢
The Rear Turn Lamp


?€¢
The Turn Signal Indicator


?€¢
The Sidemarker Lamp


?€¢
The Sideview Mirror (Pontiac Thunder only)

The turn signal switch also sends a separate on-off signal to the Daytime Running Lamps (DRL) control module, which relays the signal to the appropriate front turn signal. The front turn signals are grounded at G101 and G102. The rear turn signals are grounded at G401. The sidemarker lamps are grounded through the corresponding front parklamp.
The sideview mirror turn signals are a bank of LEDs placed behind the mirror glass.
The hazard lamps operate on battery voltage. The HAZARD fuse supplies battery voltage to the turn signal switch. When the hazard switch is pressed, the turn signal switch sends battery voltage to the hazard lamp/turn signal flasher, which sends an on-off signal to the turn signal switch. The turn signal switch send the on-off signal to all the turn signal lamps, causing all the lamps to flash including both IPC turn signal indicators. The hazard lamp/turn signal flasher is grounded at G200.
When the parklamps are ON, the sidemarker lamps receive voltage from the park lamp supply voltage circuit and illuminate. The sidemarker lamp is grounded through the corresponding rear turn signal. When the turn signal switch is place in the left or right hand position, the rear turn signal illuminates and the sidemarker lamp will loose its ground, causing the sidemarker lamp to turn off when the turn signals are on and to illuminate again when the turn signal is off.
Which blub an socket did you replace ? check the other blub ? The switch and or the flasher module can cause this problem .
Replace the turn signal switch. Refer to Multifunction, Turn Signal, and Hazard Switch Replacement - On Vehicle in Steering Wheel and Column.
Did you complete the replacement?

Which

Oct 11, 2015 | 2001 Pontiac Montana

1 Answer

No turning signals


Turn Signal Lamps
The turn signal lamps are made up of the front park/turn signal lamps and rear turn signal lamps. The front turn signal lamps flash with the rear turn signal lamps when a turn is initiated using the turn signal/multifunction lever. The turn signals will operate only with the ignition switch in the RUN position and will not operate during hazard flasher operation.
When the ignition is turned to the RUN position, battery voltage is supplied to the TURN SIGNAL, CORN LPS Fuse. Battery voltage is then applied through the TURN SIGNAL, CORN LPS fuse circuit to the hazard warning switch. The hazard switch supplies a turn signal flasher signal to the turn signal switch. With the turn signal switch in the LH or RH position the corresponding turn signal indicator, rear turn signal, and front turn signal receive the turn signal switch signal and will flash. The front turn signals receive the turn signal switch signal from the turn signal switch via the body control module (BCM) . The front turn lamps are grounded at G101. The rear turn lamps are grounded at G301 and G302.
Turn Signal Lamps and/or Indicators Inoperative

2

  1. Turn the ignition switch to the ON position.
  2. Place the turn signal switch in the LH and RH on position.
Do the turn signals operate properly?
Go to Testing for Intermittent Conditions and Poor Connections yes
Go to Step 3 no

3

Are all of the turn signal lamps and indicators inoperative?
Go to Step 5 yes
Go to Step 4 no

4

Are only the turn signal indicators inoperative?
Go to Step 16 yes
Go to Step 9 no

5

Check the TURN SIGNALS CORN LPS fuse for an open.
Is the TURN SIGNALS CORN LPS fuse open?
Go to Step 25 yes
Go to Step 6 no

6

  1. Disconnect the hazard switch.
  2. Turn the ignition to the ON position, with the engine OFF.
  3. Connect a test lamp between the ignition positive 1 voltage circuit of the hazard switch and a good ground.
Does the test lamp illuminate?
Go to Step 7 yes
Go to Step 27 no

7

Connect a test lamp between the ignition 1 positive supply voltage circuit of the hazard switch and the ground circuit of the hazard switch .
Does the test lamp illuminate?
Go to Step 8 yes
Go to Step 23 no

8

  1. Install a fused jumper between the ignition 1 positive voltage circuit of the hazard switch and the turn signal flasher signal circuit of the hazard switch.
  2. Place the turn signal switch in the RH on position and the LH on position.
Do the turn signal lamps illuminate?
Go to Step 17 yes
Go to Step 15 no

9

Is a front turn signal inoperative?
Go to Step 10 yes
Go to Step 13 no

10

  1. Turn the ignition switch to the ON position.
  2. Disconnect the inoperative front turn signal lamp.
  3. Connect a test lamp between the supply voltage circuit of the inoperative front turn signal lamp and a good ground.
  4. Place the turn signal switch in the appropriate ON position.
Does the test lamp flash ON and OFF?
Go to Step 14 yes
Go to Step 11 no

11

  1. Disconnect the body control module (BCM) connector.
  2. Connect a test lamp between ground and the front turn signal switch signal circuit of the BCM.
  3. Place the turn signal switch in the appropriate ON position.
Does the test lamp flash ON and OFF?
Go to Step 12
Go to Step 22

12

Test for an open or for a high resistance in the supply voltage circuit of the inoperative front turn signal lamp. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?
Go to Step 34
Go to Step 21

13

  1. Turn the ignition switch to the ON position.
  2. Disconnect the inoperative rear turn signal lamp.
  3. Connect a test lamp between the supply voltage circuit of the inoperative turn signal lamp and a good ground.
  4. Place the turn signal switch in the appropriate ON position.
Does the test lamp flash ON and OFF?
Go to Step 14
Go to Step 28

14

Connect a test lamp between the ground circuit of the inoperative turn signal lamp and supply voltage circuit of the inoperative turn signal lamp.
Does the test lamp illuminate?
Go to Step 20
Go to Step 26

15

Test for an open or high resistance in the turn signal flasher signal circuit. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?
Go to Step 34
Go to Step 18

16

  1. Turn OFF the ignition.
  2. Disconnect the instrument panel cluster (IPC).
  3. Connect a test lamp between the supply voltage circuit of the inoperative turn signal indicator and the instrument panel cluster (IPC) ground circuit.
  4. Place the turn signal switch in the appropriate ON position.
Does the test lamp flash ON and OFF?
Go to Step 19
Go to Step 24

17

Inspect for poor connections at the harness connector of the hazard switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?
Go to Step 34
Go to Step 30

18

Inspect for poor connections at the turn signal switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?
Go to Step 34
Go to Step 29

19

Inspect for poor connections at the instrument panel cluster (IPC). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?
Go to Step 34
Go to Step 31

20

Inspect for poor connections at the inoperative turn signal lamp. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?
Go to Step 34
Go to Step 32

Sep 05, 2015 | 2001 Oldsmobile Intrigue

3 Answers

Turn signals not working


all else on car works perfectly (other shoe drops??????)
waring 1: no scan tool, you will fail (99%)
is battery fully charged to 12.6vdc rested or at 10v?
all 4 corners dead?
not working means dead?, flashes too fast/slow or dim? or they stick on? (5 modes to fail not counting L/R and haz)
do the hazards work? (prime evidence and not stated)
most cars before 2007 have fuse marked TURN.
but not this car... its not at all like older cars....
did you scan it first after the fuse tests? any PCM scan tool.?
2009 WK jeep
the FSM chapter 8L shows the huge list of errors the lamps can fail. DTC errors.
in fact 8 blinker codes, ! DTC errors,

there is no fuse, just for turns, (trailer lamps fuse 19)

read this excerpt from the FSM book.

The turn signal system operates on battery current received on a fused ignition switch output (run) circuit so that the
turn signals will only operate with the ignition switch in the On position. The hazard warning system operates on
non-switched battery current received on a fused B(+) circuit so that the hazard warning remains operational regardless
of the ignition switch position. When the turn signal system is activated, the circuitry of the left multi-function
switch and the FCM will cause the selected (right or left) turn signal indicator, front park/turn signal lamp, front side
marker lamp and rear tail/stop/turn signal lamp to flash on and off. When the hazard warning system is activated,
the circuitry of the hazard warning switch and the FCM will cause both the right side and the left side turn signal
indicators, front park/turn signal lamps, front side marker lamps and rear tail/stop/turn signal lamps to flash on and
off. The Front Control Module (FCM) can also activate the hazard warning system lamps.
end quote)

the module front control MFC, runs this
and it uses fuse 18 , if 18 blows the module goes off line and vast things fail and huge numbers OF DTCs store.
and fuse 27 MFC
MFC needs these fuses good.
keep in mind nobody has MFC internal schematics...so........



this module drives left and right side front and rear.
electronic drivers, not fuses.
the MFC is here.
the fuses are 12,13,18, 20,27 that power MFC.


25812039-lb3yimx2pwhstnjl4tgwffiq-2-0.jpg ground this end.

Aug 07, 2015 | 2009 Jeep Grand Cherokee

2 Answers

02 Buick LeSabre Ltd. Rear flashers work (blinking rapidly), front bulbs stay on, inside indicators also flash rapidly. Replaced control module under the dash. Did not help. What else could it be?


Hi there., when flashers/indicators work rapidly on the dashboard you should check whether it is the same on the actual bulds. Fadt flashing is usually a sign of a bulb failure somewhere. If everything is functioning ok externally I would consult a competent technician for a diagnosis.

Jun 08, 2015 | 2002 Buick LeSabre

2 Answers

Corner lamps wont flash on1991 nissan stanza


Have you tested the Flashers for continuity?

May 10, 2014 | 1991 Nissan Stanza

1 Answer

None of the blinkers work on my 1996 dodge stratus, all bulbs are good as the park lights and flashers work. I have three dead ports in fusebox under hood.


Guessed it's a V6. Trying to sort this out. If setting the headlamp switch to PARK turns on the park filaments of the front park/turn signal lamp and the tail filaments of the rear tail/stop lamps and the separate tail lamps, the park light circuit is good. If 20A fuse 6 in the power distribution center is OK, the combination flasher in the multifunction switch is receiving power. Power is directed to the turn signal lamps by operation of the turn signal/hazard warning switch. If the turn signals are not flashing, the combination switch may have failed or the turn signal flasher part of the combination flasher may have failed. Finally, the hazard warning switch causes the turn signal elements of the front combination park/turn signal lamps and the rear turn lamps to flash.

Sep 14, 2012 | 1996 Dodge Stratus

1 Answer

I have a 99 Pontiac Sunfire, 2.2L and my turn signals quit working. I replaced the combination switch and the flasher/hazard relay, and still no joy. The problem was intermittent, and now it's just dead....


It will turn on when I hit the button and the turn signals do work. All of this has led to my ABS lights to come on as well. ??????????? Your best bet , take it to a qualified repair shop or learn to do better explanation's ! Or lean to do automotive electrical testing .
Basic Electricity for Service Techs Ohm law Current Flow Opens Shorts
Electric Testing Techniques You Need to Know

How to Use Multimeter to Troubleshoot Common Problems

Do you know what a wiring diagram is ? How to use a DVOM - digital volt ohm meter ? Free wiring diagrams here http://www.bbbind.com/free_tsb.html Enter vehicle info. year make ,model and engine size. Under system click on lighting ,then under subsystem click on turn signals . Click the search button then the blue links .Check power an ground circuits ! This is how we diagnose electrical faults , not just replacing parts .

Turn Lamps
Voltage is applied through the TURN fuse and the turn/hazard flasher when the ignition switch is in the following positions:
• RUN
• BULB TEST
• START
The voltage travels to the contact in the hazard switch. The hazard switch is located in the turn/hazard-headlamp switch assembly. This contact is normally closed.
When the left turn signal is turned on, voltage is applied to the following components.
• The left turn indicator
• The left front park/turn lamp circuit 14
• The left rear turn lamp circuit 18
The turn lamps turn on immediately. The current flow heats up the timing element. The timing element is located in the turn/hazard flasher. The timing element repeatedly opens and closes the circuit. This action causes the turn lamps to begin flashing.
The voltage that is applied to the left front park/turn lamp is also applied to the left front marker lamp. If the headlamp switch is in the OFF position, the left front marker lamp will find a path to ground through one of the following lamps. The following lamps provide low resistance paths to ground:
• The right front marker lamp
• The right turn indicator
• The right front park/turn lamps
• The left front park/turn lamps
The left front marker lamp flashes with the turn lamps. The voltage drop across the marker lamp is much higher than the voltage drop across the other lamps. The lamps that are used for the ground path will not flash.
When the headlamp switch is in either the PARK or HEAD positions, voltage is applied through the following components:
• The EXT LP fuse
• The marker lamps
• The park lamps
When the left turn signal is turned on, the left marker lamp will have voltage at both connections. The left marker lamp does not light. When the turn/hazard flasher stops the voltage to the turn lamps, the marker lamp is grounded through the turn lamp. The marker lamp does not go on. The left front marker lamp flashes in the following manner:
• The left front marker lamp flashes on when the turn filament of the left front park/turn lamp goes off.
• The left front marker lamp flashes off when the turn filament of the left front park/turn lamp goes on.
Voltage is applied to the right lamps in the same manner, when the right turn signal is turned on.
Hazard Lamps
Voltage is applied at all times through the following components to the normally open contact of the hazard switch in the turn/hazard-headlamp switch assembly:
• The STOP HAZ fuse
• The turn/hazard flasher
When the hazard switch is turned on, voltage is applied to the following components:
• The front turn lamps
• The rear turn lamps
The following lamps flash on and off:
• All of the turn lamps
• Both of the turn indicators
The front marker lamps flash with the hazard lamps on, just as the front marker lamps flash when the turn lamps are on. If the headlamp switch is in the OFF position, the front marker lamps flash on when the hazard lamps are on. The front marker lights will flash on when the hazard lamps are on if the headlamp switch is in one of the following positions:
• PARK
• HEAD
When the hazard lamps are on, the following conditions apply:
• The turn circuit is always open.
• The turn/hazard flasher controls the lamp.
Park/Marker Lamps
Voltage is applied through the EXT LP fuse, to the headlamp switch at all times. Voltage is applied to the park lamps and the marker lamps when the headlamp switch is in the following positions:
• PARK
• HEAD
The front marker lamps are grounded through the turn filament of the respective front park/turn lamp. The front marker lamps light as a result.
Stop Lamps
Voltage is applied through the STOP HAZ fuse to the brake switch at all times. When the brake pedal is depressed, the brake switch closes. This action applies voltage through the turn/hazard-headlamp switch assembly to the following lamps:
• The high mounted stop lamp assembly
• The left tail/stop-turn lamps
• The right tail/stop-turn lamps


Jun 30, 2017 | 1999 Pontiac Sunfire

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