2019 Jeep Grand Cherokee — Bulb Sizes (Headlight, Tail, Fog)

Quick reference

Notes

• The 2019 Grand Cherokee was offered with two primary headlamp families: halogen projector (common on Laredo/Altitude/Limited) and HID/bi‑xenon projector with LED accents (common on Overland/Summit/SRT/Trackhawk). Always confirm by VIN or visual inspection before ordering.
• Many trims use factory LED fog lamps that are sealed modules; some base trims may have serviceable halogen PSX24W fog bulbs.

LED vs halogen upgrade considerations

• Headlights (9012/9005): The Grand Cherokee’s halogen circuits are PWM and CANBUS‑monitored. Use high‑quality, CANBUS‑ready LED kits and add anti‑flicker/decoder modules if you see strobing or bulb‑out warnings. Ensure the LED’s emitter placement matches the 9012/9005 filament geometry to preserve the projector/reflector beam pattern. Check dust‑cap clearance and heat management.
• HID (D3S): If equipped with OEM HID, stay with D3S capsules; “LED conversions” in HID projectors often scatter light and can trigger errors. Replace D3S bulbs in pairs and avoid mixing color temperatures. If you have no light or pink/green output, test the ballast/igniter as well.
• Fog lights: If your trim has sealed LED fogs, the whole lamp must be replaced to “upgrade.” If you have PSX24W halogen fogs, choose CANBUS‑compatible LEDs to avoid errors.
• Turn signals: Converting 7444/7440 to LED commonly causes hyperflash. Either use load‑resistor kits (approx. 6Ω/50W per corner) or premium CANBUS LED turns designed for FCA vehicles. Verify adequate ventilation—resistors get hot.
• DRL interaction: On halogen trims, the 9005 high beam doubles as DRL at reduced voltage. Many generic 9005 LEDs will flicker in DRL mode unless paired with proper decoders.
• Interior/license: Most 194/578 interior positions accept simple LED swaps; choose CANBUS‑friendly bulbs to prevent faint glowing when off.

How to replace each bulb

• Low beam (9012 halogen): Open hood, remove rear dust cap from the projector, press tab and rotate the 9012 counterclockwise to release. Avoid touching glass. Re‑seat O‑ring and replace cap.
• High beam/DRL (9005 halogen): Access from behind housing; twist 9005 counterclockwise. Verify connector is fully latched to avoid DRL dropout.
• HID D3S (if equipped): Disconnect battery negative. Remove dust cap, unlock the D3S retaining collar, pull capsule straight out. Do not touch arc tube. Refit and test before sealing.
• Fog light: From below or by loosening wheel‑well liner. For PSX24W, twist to remove. For sealed LED fogs, remove the lamp assembly (fasteners at bumper/fog bezel) and replace as a unit.
• Front turn (7444/7440): Access behind headlamp; quarter‑turn the socket, swap the amber bulb. Align tabs to prevent water intrusion.
• Rear turn (7440A) and reverse (921): Open liftgate, remove access panel on the inner trim or unbolt the lamp (depending on side). Quarter‑turn socket, replace bulb.
• Brake/tail/side marker (outer lamp LEDs): If an LED segment is out, replace the entire tail lamp assembly; no serviceable bulb.
• License plate (194): Remove two screws on the lens, pull housing down, twist socket, replace 194.
• Interior map (194): Pry the lens gently, pull wedge bulb straight out. Use plastic trim tools.
• Rear dome/cargo (578): Pry lens, spring‑clip the festoon out. Check polarity on LEDs.

Common lighting issues for this generation

• LED tail lamp failures: Partial LED strip outages or moisture inside the WK2 tail lamps are not uncommon; the cure is replacement of the assembly.
• Headlamp condensation: Ensure rear caps and vent tubes are seated; minor misting after washes is normal, pooling is not.
• HID aging: D3S bulbs shift color and dim around 5–7 years. Intermittent flicker can be capsule or ballast related.
• Hyperflash and bulb‑out warnings after LED swaps: Use proper CANBUS LEDs and/or load resistors; secure resistors to metal away from wiring.
• DRL flicker with LED high‑beam bulbs: Add anti‑flicker decoders compatible with PWM‑driven DRL circuits.
• Fog lamp wear: Pitted lenses or LED module failures require full lamp replacement on sealed units.

Always verify your housing type and build date; FCA made mid‑cycle changes. When in doubt, check your owner’s manual or inspect the part number on the lamp.

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