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Re: Turn signals stop working. front lights are on but...
Sounds like a wire has come lose on the back winkers...bet they dont flash as well!!....thats were i would look..for a lose wire..on the back winkers. could even be a earth!!!
hope this helps...Howard
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Circuit/System Description
Ground is applied at all times at G201 to the turn signal/multifunction switch. The turn signal lamps may only be activated with the ignition switch in the ON or START position. When the turn signal/multifunction switch is placed in either the TURN RIGHT or TURN LEFT position, ground is applied to the body control module (BCM) through either the right turn or left turn signal switch signal circuit. The BCM then applies a pulsating voltage to the front and rear turn signal lamps through their respective control circuits.
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Did you check the RT STOP TRN fuse 15amp insturment panel fuse box.
Fuse Block - I/P
Left of the I/P behind the side trim panel
If the fuse is good , you could have a wiring problem or the BCM is bad .
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 .
Looks can deceive you. If the front light comes on when the turn signal is on but there is no blink you need to find a burned out bulb on that side. Many cars have more than one bulb in the rear. One bulb out of the set can stop the blinking.
The circuit boards in Chevrolet tail lamps ar notorious for going bad. Dorman makes a replacement circuit board, part number 70006 . the same part number will fit either the left or right side of your Trailblazer.
It depends on if its the front or the rear bulb. In the front the screws are mostly on the out side of the car. The baco screwa ar in side the trunk inside of the truck liner. You have to remove the hole light fixture from the car and then turn the bulb holder out to change the bulb
Possible cause is the connector is disconnected and the bumper area. Main ground wire may be loose, check manual for ground location. Also the wiring loom may have been damaged between the rear lights and the front connector. The front lights will blink fast when the rear lights do not work. There could also be a problem with the turn signal switch. Check with the wiring schematics to see which wires to check for power.
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