Inspection Procedure

1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch ON, driver's door close and push the hand-held tester main SW ON.
3. Select the item "KEY REMND BUZZER" in the ACTIVE TEST, and operate the key reminder buzzer.
   1. OK: 
   2. Tuns Key reminder buzzer ON 

NG: Go to step   6 

OK: Go To Next Step 

1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch ON and push the hand-held tester main SW ON.
3. Select the item "KEY UNLK WRN SW" in the DATA LIST and read its value displayed on the hand-held tester.

   OK: 

   1. ON: The key is in the IG key cylinder 
   2. OFF: The key is not in the IG key cylinder 

OK: Go to  DOOR COURTESY SWITCH ASSY (FOR FRONT DOOR) CIRCUIT  

NG: Go To Next Step 

1. Remove the key unlock warning switch assy.
2. Inspect the key unlock warning switch assy continuity.
   1. Standard: 
   TERMINAL CONDITION
   
   

   Terminal No.	Condition	Specified condition
   1 <=> 2	Free	No continuity
   	Push	Continuity

NG: REPLACE UNLOCK WARNING SWITCH ASSY 

Fig 1: Identifying Unlock Warning Switch Assy

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go To Next Step 

1. Disconnect the B4 body ECU and U1 unlock warning switch connectors.
2. Check the continuity between the body ECU wire harness side connector and unlock warning switch wire harness side connector.
   Fig 2: Disconnecting Unlock Warning Switch Connector From B4 Body ECU

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Standard: 
   TERMINAL CONDITION
   
   

   Symbols (Terminal No.) (Body ECU <=> Unlock warning switch)	Condition	Specified condition
   KSW (B4-19) <=> (U1-2)	Constant	Continuity

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: Go To Next Step 

1. Disconnect the U1 unlock warning switch connector.
2. Check the continuity between terminal 1 and the body ground.
   1. Standard: 
   TERMINALS CONDITION
   
   

   Condition	Specified condition
   Constant	Continuity

   Fig 3: Identifying Unlock Warning Switch Connector (Wire Harness Side)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPLACE DRIVER SIDE JUNCTION BLOCK ASSY 

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

1. Disconnect the B4 body ECU and C8 meter ECU connectors.
2. Check the continuity between the body ECU wire harness side connector and the meter ECU wire harness side connector.
   Fig 4: Checking Continuity Between Body ECU Connector And Meter ECU Wire Harness Side Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Standard: 
   TERMINAL CONDITION
   
   

   Symbols (Terminal No.) <=>Body ECU <=> Meter ECU=>	Specified condition
   KW (B4-1) <=> KW (C8-15)	Continuity

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

OK: Go to  HOW TO PROCEED WITH TROUBLESHOOTING