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The sensor light for the turn signal is on - 2005 Jeep Wrangler

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Replace bulbs even if they look good. Check your ground wires from front and rear light sockets. The light should go off after replacing bulbs.:)

Posted on Sep 07, 2009

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Posted on Jan 02, 2017

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08 Buick lucerne cxl. Third brake light works as well as front signal lights. No rear brake lights or turn signals. Tail lights and headlights and third brake lights works. Bulbs good. Help


Stop Lamps
The brake pedal position sensor is used to sense the action of the driver application of the brake pedal. The body control module (BCM) provides a 5-volt reference voltage and low reference to the brake pedal position sensor. The position sensor provides an analog voltage signal back to the BCM that will increase as the brake pedal is applied. When the brake is applied, the BCM will then apply battery voltage to the left and right stop/turn signal lamp supply voltage circuits and the center high mounted stop lamp (CHMSL) supply voltage circuit illuminating the stop lamps. At the same time the BCM applies battery voltage through the signal circuit to the transmission control module (TCM) and the engine control module (ECM) indicating that the brakes are applied.
Ground for the stop lamps is supplied as follows:
• G402 provides ground for the left rear stop/tail/turn signal lamps
• G403 provides ground for the right rear stop/tail/turn signal lamps
• G301 provides ground for the CHMSL
The stop lamps on this vehicle will not illuminate unless the ignition is in the accessory, run, or crank positions. When the ignition is in the OFF position the stop lamps will not illuminate when the brake pedal is applied.
Battery voltage from the LT TRN/SIG and RT TRN/SIG fuses located in the rear fuse block is also used by the body control module (BCM) for stop lamp operation.

Turn Signal Lamps
Battery voltage supplied to the body control module (BCM) from the fuses listed below is used for turn signal and hazard lamp operation.
• LT TRN/SIG fuse for the left turn signals
• CTSY/RF TRN fuse for the right front turn signal
• RR TRN/SIG fuse for the right rear turn signal
When the turn signal switch is place in either the LEFT or RIGHT position, ground from G300 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. At the same time the BCM sends a GMLAN serial data message to the instrument panel cluster (IPC) to cycle the appropriate turn signal indicator ON and OFF.
Ground for the turn signal lamps is supplied as follows:
• G104 provides ground for the left and right front turn signal lamps
• G402 provides ground for the left rear stop/tail/turn signal lamps
• G403 provides ground for the right rear stop/tail/turn signal lamps

Do you have a factory scan tool (tech2) ? Your best bet , take it to the dealer .

Sep 08, 2017 | Buick Cars & Trucks

2 Answers

The indicator light flickers what does that mean


Could be a bad sensor or wiring problem.

Oct 27, 2015 | Cars & Trucks

1 Answer

2006 grand Prix the drl stay on and will not go off if they do go off the come back on with nobody around the car keeps running the battery dead ????? Ready to burn it


Daytime Running Lamps (DRL)
The ambient light sensor is used to monitor outside lighting conditions. The ambient light sensor provides a voltage signal that will vary between 0.2 and 4.9 volts depending on outside lighting conditions. The body control module (BCM) provides a 5-volt reference signal to the ambient light sensor. The ambient light sensor is permanently grounded at ground G202. The body control module (BCM) monitors the ambient light sensor signal circuit to determine if outside lighting conditions are correct for either daytime running lights (DRL) or automatic lamp control (ALC) when the headlamp switch is in the AUTO position. In daylight conditions the BCM will command the low beam headlamps ON at reduced intensityy. Any function or condition that turns on the headlamps will cancel DRL operation.
There could be a DTC stored in the BCM pointing to a problem !
DTC B2645 Ambient Light Circuit

2

Turn the headlamp switch to the OFF position.
Do the low and high beam headlamps remain OFF?
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
Go to Step 3

3

Remove the appropriate low or high relay.
Do the lamps turn OFF?
Go to Step 5
Go to Step 4

there could

Oct 26, 2015 | Cars & Trucks

1 Answer

Headlight sensor


I have seen the sensor fall out of the dash housing. When you put it back it should be good again.

Jun 10, 2017 | 2006 Buick Terraza

1 Answer

2009 Impala rear lights not working


Turn Signal Lamps
The LT T/SIG and RT T/SIG fuses located in the underhood fuse block supplies battery positive voltage to the body control module (BCM) for turn signal and hazard lamp operation. When the turn signal switch is place in either the LEFT or RIGHT position, ground from G202 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.
Ground for the turn signal lamps is supplied as follows:
• G101 provides ground for the left front turn signal lamp
• G100 provides ground for the right front turn signal lamp
• G302 provides ground for the left and right rear turn signal lamps

The LT T/SIG and RT T/SIG fuses located in the underhood fuse block are also used by the body control module (BCM) for stop lamp operation.
The brake pedal position sensor is used to sense the action of the driver application of the brake pedal. The body control module (BCM) provides both, a 5-volt reference voltage and low reference to the brake pedal position sensor. The position sensor provides an analog voltage signal back to the BCM that will increase as the brake pedal is applied. When the brake pedal is applied, the BCM will then apply battery voltage to the left and right stop lamp supply voltage circuits and the center high mounted stop lamp (CHMSL) supply voltage circuit illuminating the stop lamps. At the same time the BCM signals the transmission control module (TCM) and the engine control module (ECM) that the brakes are applied. Ground for all stop lamps is provided at G302.
The stop lamps on this vehicle will not illuminate unless the ignition is in the accessory, run, or crank positions. When the ignition is in the OFF position the stop lamps will not illuminate when the brake pedal is applied.

Did you check the fuse's. ? Wouldn't think it's a ground because right an left tail lamp Assembly's use same ground ! Did you check for B+ voltage at the bulb. with a volt meter ? Power is supplied by the BCM . Could be the tail lamp assembly

Jul 19, 2017 | Cars & Trucks

2 Answers

2002 Chevrolet Avalanche ABS and Brake Lights come on while driving. When truck is turned off, lights go out and do not come back on until I have restarted and have been driving for a while again. Brake...


ur gonna have to get ur abs system scanned for codes, possibly bad speed sensr at one of ur wheels, need to check ur computer parameters, to b able to pinpoint faulty sensor or sensors. anothr cause could b low brake fluid level,or ur third brake light bulb is out all of these can cause ur condition.. good luck

May 01, 2011 | Chevrolet Avalanche Cars & Trucks

1 Answer

My 98 ram's cab lights stay on and blink off and on while i am driving, also my front right turn signal light does not work, it is not the bulb? what do you think it is?


The reason ur cab lights go on and off is from the door sensors on the door frame are not sending the correct signal to the light. Ur turn signal is either ur turn signal switch on your steering column or your turn signal relay

Sep 22, 2010 | 1998 Dodge Ram 1500 4WD

1 Answer

THE CAR DISPLAYES ANTI-LOCK BRAKE LIGHT THEN SHUTS OFF IMMIDIATELY AFTER 91 FLEETWOOD CADILLAC , BROUGHAM


I am assuming this is while you are driving the vehicle? The light should come on and turn off at start up, as the ABS computer runs a self check. If the issue presents itself while driving, it is likely a wheel speed sensor that is starting to fail. If the computer looses the signal it will turn on the dash light, when it sees a signal again it will turn the light off. Could be a broken wire between the chassis and wheel speed sensor or a bad sensor. If you can, check the ABS codes, they should be stored.

Jan 19, 2010 | 1991 Cadillac Fleetwood

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