Keyfob Battery and Function Circuit Check

Keyfob Battery and Function Circuit Check

Description

The following functions are available when having and carrying electronic ID.

- Door lock/unlock
- Panic alarm

Remote control entry function and panic alarm function are available when operating the remote buttons.

Component Function Check

NOTE:

The Signal Tech II (J-50190) can be used to test the remote keyless entry keyfob relative signal strength. Refer to the Signal Tech II User Guide for additional information.

1. CHECK FUNCTION

With SDT

Check remote keyless entry receiver by pressing the keyfob lock and unlock buttons then monitoring "KEYLESS LOCK" and "KEYLESS UNLOCK" in data list mode "DOOR LOCK" with SDT.






Is the inspection result normal?
YES
Keyfob is OK.
NO
Refer to "Diagnosis Procedure".

Diagnosis Procedure

NOTE:

The Signal Tech II (J-50190) can be used to test the remote keyless entry keyfob relative signal strength. Refer to the Signal Tech II User Guide for additional information.

1. CHECK KEYFOB FUNCTION

Check keyfob function using Signal Tech II Tool J-50190 or Remote Keyless Entry Tester J-43241 (shown).






Does the test pass?
YES
Keyfob is OK.
NO
GO TO 2

2. CHECK KEYFOB COMPONENTS

1 Open the lid using a coin.






CAUTION:
- Do not touch the circuit board or battery terminal.
- The keyfob is water-resistant. However, if it does get wet, immediately wipe it dry.

2 Remove the keyfob battery.

CAUTION:
- Keep dirt, grease, and other foreign materials off the electrode contact area.

3 Visually inspect keyfob internal components.

Is the inspection result normal?
YES
GO TO 3
NO
Repair or replace malfunctioning parts.

3. CHECK KEYFOB BATTERY

Check by connecting a resistance (approximately 300ohms) so that the current value becomes about 10 mA.











Is the measurement value within specification?
YES
Keyfob battery is OK. Check remote keyless entry receiver. Refer to [Remote Keyless Entry Receiver Circuit Check] Remote Keyless Entry Receiver Circuit Check.
NO
GO TO 4.

4. REPLACE KEYFOB BATTERY

1 Replace the keyfob battery, positive side down.
2 Align the tips of the upper and lower parts, and then push them together until it is securely closed.






CAUTION:
- When replacing battery, keep dirt, grease, and other foreign materials off the electrode contact area.

3 After replacing the battery, check that all keyfob functions work properly.

Is the inspection result normal?
YES
Keyfob is OK.
NO
Check remote keyless entry receiver. Refer to [Remote Keyless Entry Receiver Circuit Check] Remote Keyless Entry Receiver Circuit Check.