Troubleshooting Grand Cherokee Turn Signals

Written by daniel valladares
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Troubleshooting Grand Cherokee Turn Signals
The Jeep Grand Cherokee uses 3157A bulbs for its front signals and 3157K bulbs for its rear signals. (Jupiterimages/Photos.com/Getty Images)

If the indicators on your Jeep Grand Cherokee go out, they should be fixed immediately. Not only do indicators help prevent against accidents, but driving with faulty indicators can result in a citation from the local authorities. The three most common issue with faulty indicators are loose wiring, a burnt out bulb, or a broken fuse. All three problems have simple solutions that only require a pair of clean gloves and a Torx screwdriver to perform.

Skill level:
Easy

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Things you need

  • Clean gloves
  • Replacement bulb
  • Replacement fuse
  • Torx screwdriver

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Instructions

    Front Indicators

  1. 1

    Open the Grand Cherokee's bonnet and turn off the engine. Put on the clean gloves. Reach into the vehicle and locate the turn signal bulb on the headlamp assembly. The turn signal bulb is the smallest bulb on the headlight assembly. Rotate the turn signal bulb one-quarter turn counterclockwise and pull it straight out of the housing.

  2. 2

    Pull on the electrical connector of the bulb. If it comes off, plug it onto the bulb firmly, making sure the tabs click into place. Put the bulb back into the assembly and test the turn signal lights. If they are still not working, you may need to replace the bulb.

  3. 3

    Pull the bulb back out of the assembly and squeeze the tabs on the electrical connector to remove it from the bulb. Place the electrical connector onto a replacement 3157A type bulb. Place the bulb into the headlamp assembly and rotate it clockwise to lock it into place. If the headlights are still malfunctioning, you may need to inspect the turn signal fuse.

  4. 4

    Open the bonnet and locate the power distribution centre, directly beneath the coolant tank. Remove the cover. Underneath the cover you will find a fuse puller and several spare fuses. Locate the fuses numbered "38" and "39." These are the left and right headlight fuses which also apply for the indicators. If either fuse is broken, pull it out with the fuse puller and replace it with a 20A yellow fuse. Do not use any other fuse. A fuse is broken if the metal inside of the fuse is broken. Place the cover back onto the power distribution centre and close the bonnet.

    Rear Indicators

  1. 1

    Raise the Grand Cherokee's tailgate and turn off the engine. Put on the clean gloves. Use the Torx screwdriver to remove the two Torx screws on the inside of the vehicle, directly behind the tail light assembly. Pull on the electrical connector. If it comes off, securely plug it in and test the turn signal lights. If they are not working, the bulb will need to be replaced.

  2. 2

    Squeeze the socket assembly tabs on the middle socket to remove it from the assembly. Pull the old bulb out and replace it with a 3157K type bulb. Place the socket back into the assembly until it clicks into place. Reattach the Torx screws and close the tailgate. If the lights are still malfunctioning, the fuse will need to be inspected.

  3. 3

    Open the bonnet and locate the integrated power module, directly underneath the power distribution centre. Remove the cover and locate the fuses numbered "19" and "21." These are the left and right tail lamp fuses. If either is broken, use one of the 20A yellow spare fuses found under the cover of the power distribution centre and the fuse puller to replace them. Place the cover back onto the integrated power module and close the bonnet.

Tips and warnings

  • If the indicators still do not work, consider taking your vehicle to a mechanic or certified technician, as there may be an issue with your electrical system.
  • Do not touch the new bulb with your fingers. Oil contamination will shorten bulb life.
  • If you accidentally touch the bulb with your bare hands, clean the bulb with rubbing alcohol.

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