Remote switch will not lock or unlock vehicle.

Attach the battery cables to the correct positive and negative connections,close the hood,use your remote to lock and unlock the doors and the horn should stop.The vehicle may be in anti theft mode and locking and unlocking the doors with them closed should put the vehicle back into normal mode.
Your radio may show antitheft mode now and the code to return it to normal should be in your vehicle handbook in the glove compartment or attached on a sticker to the side of the glove compartment.It can also be had from a Honda dealer.DO NOT EVER REVERSE YOUR BATTERY CABLE CONNECTIONS.

Do any doors lock/unlock with remote keyless entry ?

• The doors do not lock/unlock using the remote transmitter

• Remote transmitter battery.
• Remote transmitter.
• Remote transmitter programming.
• Aftermarket system.
• High power devices.
• TV/radio transmission towers.
• Vehicle security module.

• Go To Pinpoint Test C .

Pinpoint Test C: The Doors Do Not Lock/Unlock Using The Remote Transmitter
Normal Operation
Remote locking and unlocking of the doors is accomplished by the vehicle security module receiving a command message from the remote transmitter. The vehicle security module processes the command and sends a signal directly to the door lock actuators.
All remote transmitters must be present to begin diagnosis of the remote keyless entry (RKE) system.
Aftermarket or dealer-installed systems may adversely effect the RKE system operation. These systems should be disconnected before diagnosing any RKE concerns.
Visual Inspection Chart Mechanical Electrical

• Latches

• Battery junction box (BJB) fuse(s):
  • 2 (30A)
  • 16 (15A)
  • 22 (20A)
  • 29 (60A)
• Central junction box (CJB) fuse 20 (5A)
• Circuitry
• Relays
• Remote transmitter
• Keyless entry keypad
• Vehicle security module

1. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.

1. If the cause is not visually evident, connect the diagnostic tool to the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:

• Check that the program card is correctly installed.
• Check the connections to the vehicle.
• Check the ignition switch position.

1. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool operating manual.

1. Carry out the diagnostic tool data link test. If the diagnostic tool responds with:
   • SCP+, SCP- OR UBP circuits fault; all electronic control units no response/not equipped, refer to Section 418-00 .
   • No response/not equipped for vehicle security module, refer to Section 418-00 .
   • System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs, and carry out the self-test diagnostics for the vehicle security module.

1. If the DTCs retrieved are related to the concern, go to the Vehicle Security Module Diagnostic Trouble Code (DTC) Index to continue diagnostics.

1. If DTCs are retrieved that are not found in the following Vehicle Security Module Diagnostic Trouble Code (DTC) Index, refer to the Master Vehicle Security Module Diagnostic Trouble Code (DTC) Index in Section 418-00 .

1. If no DTCs related to the concern are retrieved, proceed to the Symptom Chart to continue diagnostics.

their is a way to do it but recheck battery first sometimes the relearn process doesnt work or the fob itself is dead also if auto /remote start will need dealer to flash fob ---- 2002 santa fe and followed programming instructions and eventually was able to program the new remote. But, I did not realize I had to program my existing remote at the same time. Since, I have retried programming both remotes many times with no success--the new one works, but the old one won't. The instructions were: 1) Locate switch under dash, behind fuse box; 2) Turn ignition switch on, but don't start engine; 3) Wait 5 seconds, set memory switch to SET position; 4) Press remote LOCK button; press second remote transmitter LOCK button; 5) Set memory switch to OFF; 6) Switch ignition OFF. 7) Confirm programming by locking and unlocking vehicle.
Remote Key Programming Hyundai Forums Hyundai Forum

Sure you did put in a new battery? sure you did insert it correct? not the other way around? sure you did use the correct battery? like CR23 or AAA?
Sure all contacts in the battery compartment and on the battery are clean and shiny?
just a few things you could check.

I have a few ideas for you:

1) I know this sounds crazy, but try disconnecting the vehicle battery (both terminals) for at least 10 minutes, then reconnect them and try the remote again.

2) Replace the batteries in the key fob.

3) Take the circuit board out, wipe it down, and try again. Here is a video showing this process: How To Clean Your Key Fob Circuit Board

4) Reprogram the remote using these procedures:
1. Close all vehicle doors. 2. Insert the key into the ignition.
3. Hold down the power UNLOCK button on the driver?s door panel-continue to hold
down until instructed to release in step 9.
4. Perform steps 5 through 8 in fairly rapid succession.
5. Turn the ignition switch to the ON position (as far as you can go without starting the
engine).
6. Turn the ignition switch to the OFF position.
7. Turn the ignition switch to the ON position.
8. Turn the ignition switch to the OFF position.
9. Release the power unlock button on the door panel. The vehicle will lock and unlock
the doors automatically.
10. Hold down the LOCK and UNLOCK buttons on the transmitter simultaneously until
the door locks and unlocks.
This step may take up to 30 seconds.
11. Repeat step 10 NOW for each additional transmitter (including any existing
transmitters).
12. Turn the ignition switch to the ON position in order to exit the transmitter programming
mode.
5) Order a new remote from us online at https://www.keylessentryremotefob.com/Chevrolet-Suburban-Remotes-and-Keys-s/3679.htm

System operation
Pressing remote control lock button locks vehicle and activates system Fig. 1 . Indicators flash once. Pressing remote control unlock button unlocks vehicle and deactivates system Fig. 1 . Indicators flash twice.
Fig. 1
Synchronization
When
System malfunction. Remote control added or replaced.
How
Access alarm system control module located under driver's side lower fascia Fig. 2 . Set memory switch to SET position. Press remote control lock or unlock button. Set memory switch to OFF position. Confirm synchronization has been successful by locking and unlocking vehicle. Repeat procedure for second remote control. Synchronization can also be carried out using diagnostic equipment.
NOTE: A maximum of 2 remote controls can be programmed. NOTE: If remote control fails, system can be deactivated as detailed in the owner's handbook.

Make sure you have one working ignition key and all remotes for the vehicle.

1) Close all vehicle doors.
2) Insert the key into the ignition.
3) Hold down the power UNLOCK button on the driver’s door panel-continue to hold down until instructed to release in step 9.
4) Perform steps 5 through 8 in fairly rapid succession.
5) Turn the ignition switch to the ON position (as far as you can go without starting the engine).
6) Turn the ignition switch to the OFF position.
7) Turn the ignition switch to the ON position.
8) Turn the ignition switch to the OFF position.
9) Release the power unlock button on the door panel. The vehicle will lock and unlock the doors automatically.
10) Hold down the LOCK and UNLOCK buttons on the transmitter simultaneously until the door locks and unlocks. This step may take up to 30 seconds.
11) Repeat step 10 NOW for each additional transmitter (including any existing transmitters).
12) Turn the ignition switch OFF then to the ON position in order to exit the transmitter programming mode.

Synchronization
When
Key buttons operated repeatedly while vehicle out of range and system becomes inoperative.
How
Carry out the following within 1 minute: Press key lock or unlock button for approximately 1 second. Manually lock or unlock vehicle. System should now lock or unlock vehicle. If not, carry out programming procedure.
Programming
When
Key added or replaced. System malfunction.
How
Switch ignition ON. Insert key to be programmed into driver's door lock. Lock vehicle manually. Press lock or unlock button. Wait at least 1 second. Press lock or unlock button again. Vehicle horn sounds to indicate correct programming. Remote controls can also be programmed using diagnostic equipment.
NOTE: A maximum of 4 keys can be programmed

Depress lock or unlock button. Manually lock and unlock driver's door within 30 seconds. System should now lock or unlock vehicle. If not, carry out programming procedure.
Programming
When
Key added or replaced. System malfunction: Alarm LED in rear fog lamp switch illuminates for 30 seconds when vehicle is locked.
How
NOTE: A maximum of 4 keys can be programmed (one at a time).
As memory positions of existing keys are unlikely to be known: Obtain and reprogram all keys.
NOTE: Existing key memory positions will be overwritten.
Switch ignition ON. Use key not fitted with remote control. Manually lock vehicle using key. Using first key, press unlock button once (programs memory position 1). Alarm horn sounds once to indicate signal received. Wait 6 seconds. Press unlock button once to confirm programming. Vehicle unlocks. Programming mode deactivated. Switch ignition OFF. To program remaining keys into memory positions 2, 3 and 4. Carry out the complete procedure below for each key: Switch ignition ON. Use key not fitted with remote control. Manually lock vehicle using key. Press unlock button at 1 second intervals, as follows: Twice for memory position 2 (second key). Three times for memory position 3 (third key). Four times for memory position 4 (fourth key). Alarm horn sounds once every time unlock button is pressed, to indicate signal received. Wait 6 seconds. Press unlock button once to confirm programming. Vehicle unlocks. Programming mode deactivated. Switch ignition OFF.
NOTE: Ignition MUST be switched OFF between each key programming procedure

Close all the vehicle doors.
Insert the ignition key into the ignition lock cylinder.
Press and hold the DOOR unlock switch.
While holding the DOOR lock switch in the unlock position, cycle the ignition ON, OFF, ON, OFF.
Release the DOOR unlock switch. The doors will lock and unlock to confirm the program mode.
Press and hold the LOCK button and the UNLOCK button simultaneously on one keyless remote. After a delay of approximately 15 seconds , the doors will lock and unlock to confirm the programming of that transmitter.
Repeat the previous step to program up to four transmitters.
Turn the ignition switch to the RUN (one more click forward) position in order to exit the keyless entry transmitter mode.
Operate the transmitter functions in order to verify correct system operation