Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSJEEP1999WRANGLER L4-2.5L VIN PREPAIR AND DIAGNOSISBODY AND FRAMELOCKSKEYLESS ENTRYKEYLESS ENTRY TRANSMITTERSERVICE AND REPAIR
1999 Jeep Wrangler L4-2.5L VIN P
Keyless Entry Transmitter: Service and Repair
1999 Jeep Wrangler L4-2.5L VIN PSECTION Service and Repair
1. Obtain the additional Sentry Key transponder blank(s) that are to be programmed for the vehicle. Cut the additional Sentry Key transponder blanks to match the ignition lock cylinder mechanical key codes.
2. Insert one of the two valid Sentry Key transponders into the ignition switch and turn the ignition switch to the On position.
3. After the ignition switch has been in the On position for about 3 seconds, but no more than 15 seconds later, cycle the ignition switch back to the Off position. Replace the first valid Sentry Key in the ignition lock cylinder with the second valid Sentry Key and turn the ignition switch back to the On position.
4. About 10 seconds after the completion of Step 3, the SKIS indicator lamp will start to flash and a single audible chime tone will sound to indicate that the system has entered the Customer Learn programming mode.
5. Within about 50 seconds of entering the Customer Learn programming mode, turn the ignition switch to the Off position, replace the valid Sentry Key with a blank Sentry Key transponder, and turn the ignition switch back to the On position.
6. About 10 seconds after the completion of Step 5, a single audible chime tone will sound and the SKIS indicator lamp will stop flashing and stay on solid for about 3 seconds to indicate that the blank Sentry Key transponder has been successfully programmed. The SKIS will immediately return to normal system operation following exit from the Customer Learn programming mode.
7. Go back to Step 2 and repeat this process for each additional Sentry Key transponder blank to be programmed.
If any of the above steps is not completed in the proper sequence, or within the allotted time, the SKIS will automatically exit the Customer Learn programming mode. The SKIS will also automatically exit the Customer Learn programming mode if it sees a non-blank Sentry Key transponder when it should see a blank, if it has already programmed 8 valid Sentry Keys, or if the ignition switch is turned to the Off position for more than about 50 seconds.
2. Insert one of the two valid Sentry Key transponders into the ignition switch and turn the ignition switch to the On position.
3. After the ignition switch has been in the On position for about 3 seconds, but no more than 15 seconds later, cycle the ignition switch back to the Off position. Replace the first valid Sentry Key in the ignition lock cylinder with the second valid Sentry Key and turn the ignition switch back to the On position.
4. About 10 seconds after the completion of Step 3, the SKIS indicator lamp will start to flash and a single audible chime tone will sound to indicate that the system has entered the Customer Learn programming mode.
5. Within about 50 seconds of entering the Customer Learn programming mode, turn the ignition switch to the Off position, replace the valid Sentry Key with a blank Sentry Key transponder, and turn the ignition switch back to the On position.
6. About 10 seconds after the completion of Step 5, a single audible chime tone will sound and the SKIS indicator lamp will stop flashing and stay on solid for about 3 seconds to indicate that the blank Sentry Key transponder has been successfully programmed. The SKIS will immediately return to normal system operation following exit from the Customer Learn programming mode.
7. Go back to Step 2 and repeat this process for each additional Sentry Key transponder blank to be programmed.
If any of the above steps is not completed in the proper sequence, or within the allotted time, the SKIS will automatically exit the Customer Learn programming mode. The SKIS will also automatically exit the Customer Learn programming mode if it sees a non-blank Sentry Key transponder when it should see a blank, if it has already programmed 8 valid Sentry Keys, or if the ignition switch is turned to the Off position for more than about 50 seconds.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.