Inspection Procedure

1. Disconnect the antenna connector from the ECU.
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   TELEPHONE ANTENNA ASSEMBLY (GPS ANTENNA) AND ANTENNA CORD SUB-ASSEMBLY
   
   

   Tester Connection	Condition	Specified Condition
   1 (SIGNAL) - Body ground	Always	50 to 500 Ω

   Fig 1: Inspecting Telephone Antenna Assembly (GPS Antenna) And Antenna Cord Sub-Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to step   3 

NG: GO TO NEXT STEP 

1. Disconnect the antenna cord connector from the ECU.
2. Disconnect the antenna cord connector from the telephone antenna.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   ANTENNA CORD SUB-ASSEMBLY
   
   

   Tester Connection	Condition	Specified Condition
   1 (SIGNAL) -1	Always	Below 1 Ω
   Either terminal 1 - Body ground	Always	10 kΩ or higher

   Fig 2: Inspecting Antenna Cord Sub-Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE ANTENNA CORD SUB-ASSEMBLY THEN CLEAR HISTORIC DTC 

OK: GO TO NEXT STEP 

1. Temporarily replace the mayday ECU and mayday battery with a new one.
2. Check for the current DTC again (see DTC CHECK / CLEAR  ).

   OK: System operates normally (red LED off). 

   NG: Current DTC 3-1 exists. 

NG: REPLACE TELEPHONE ANTENNA ASSEMBLY (GPS ANTENNA) THEN CLEAR HISTORIC DTC 

OK: END (MAYDAY ECU IS FAULTY; PERFORM REGISTRATION)