Keyless Buzzer Circuit Troubleshooting
- 1. Open wire check (GND line):
- 1. Turn the vehicle to the OFF (LOCK) mode.
- 2. Disconnect the following connector.
Keyless buzzer 3P connector - 3. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Keyless buzzer 3P connector: disconnected
Test point 1 Keyless buzzer 3P connector No. 3 Test point 2 Body ground Is there continuity?
YES
The GND wire is OK. Go to step 2.
NO
Repair an open or high resistance in the ground wire or poor ground (G603).
- 2. Open wire check (SMART BUZZER line):
- 1. Disconnect the following connector.
Keyless access control unit connector B (28P) - 2. Connect terminals A and B with a jumper wire.
Terminal A Keyless buzzer 3P connector No. 2 Terminal B Body ground - 3. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Keyless buzzer 3P connector: disconnected
Keyless buzzer 3P connector: jumped to body ground
Keyless access control unit connector B (28P): disconnected
Test point 1 Keyless access control unit connector B (28P) No. 13 Test point 2 Body ground Is there continuity?
YES
The SMART BUZZER wire is not open. Go to step 3.
NO
Repair an open or high resistance in the wire.
- 3. Shorted wire check (SMART BUZZER line):
- 1. Remove the jumper wire.
- 2. Check for continuity between test points 1 and 2.
Test condition Vehicle OFF (LOCK) mode Keyless buzzer 3P connector: disconnected
Keyless access control unit connector B (228P): disconnected
Test point 1 Keyless access control unit connector B (28P) No. 13 Test point 2 Body ground Is there continuity?
YES
Repair a short to ground in the wire.
NO
The SMART BUZZER wire is OK. Go to step 4.
- 4. Keyless buzzer check (substitution):
- 1. Substitute a known-good keyless buzzer .
- 2. Check the keyless buzzer function.
Does the keyless buzzer sound?
YES
Replace the original keyless buzzer .
NO
