Check NATS Antenna Amp. Built In Key Slot

For the circuit information of this diagnosis, refer to Engine Immobilizer System Circuit Diagram.

1. CHECK POWER SUPPLY CIRCUIT 
   1. Turn ignition switch OFF.
   2. Disconnect key slot connector.
   3. Check voltage between key slot connector and ground.
      TERMINAL VOLTAGE CHART
      
      

      Terminals			Voltage (V) (Approx.)
      (+)		(-)
      Key slot connector	Terminal
      M14	1	Ground	Battery voltage

   OK or NG 

   OK: GO TO 2.

   NG: Check key slot power supply circuit for open or short.

   Fig 1: Checking Voltage Between Key Slot Connector Terminal 1 And Ground

   
2. CHECK GROUND CIRCUIT 

   Check continuity between key slot connector and ground.

   TERMINAL CONTINUITY CHART
   
   

   Key slot connector	Terminal	Ground	Continuity
   M14	8		Yes

   OK or NG 

   OK: GO TO 3.

   NG: Repair or replace harness.

   Fig 2: Checking Continuity Between Key Slot Connector Terminal 8 And Ground

   
3. CHECK KEY SLOT SIGNAL 
   1. Connect key slot connector.
   2. Check voltage between key slot connector and ground.
      TERMINAL VOLTAGE CHART
      
      

      Terminals			Condition	Voltage (V) (Approx.)
      (+)		(-)
      Key slot connector	Terminal
      M14	6	Ground	Check the voltage just after the Intelligent Key is inserted into the key slot and the ignition switch is turned to START.	The pointer of the analog tester fluctuates.
      	7

   OK or NG 

   OK: Check the condition of harness and connector.

   NG: Repair or replace harness between BCM and key slot.

   Fig 3: Checking Voltage Between Key Slot Connector Terminals 6, 7 And Ground