Inspection Procedure

1. Check the radio automatic station search function.
   1. Check the radio automatic station search function by activating it.

      OK: The radio automatic station search function works properly. 

NG: Go to step 2 

OK: REPLACE NAVIGATION RECEIVER ASSEMBLY  (See REMOVAL )

1. Check optional components (sun-shade film, telephone antenna, etc.).
   1. Check if any optional components that may decrease reception capacity, such as sunshade film or a telephone antenna, are installed.

      OK: Optional components are installed. 

      NOTE: Do not remove any optional components installed by the customer without his or her consent.

NG: Go to step 3 

OK: REMOVE OPTIONAL COMPONENTS AND CHECK AGAIN (SEE NOTICE ABOVE) 

1. Preparation for check
   1. Remove the antenna plug from the navigation receiver assembly.
2. Check for noise
   1. Turn the ignition switch to ACC with the navigation receiver assembly connector connected.
   2. Turn the radio on and tune into AM mode.
   3. Place a screwdriver, thin wire, or other metal object on the navigation receiver assembly antenna jack and check that noise can be heard from the speaker.
   Fig 1: Identifying Antenna Plug On Navigation Receiver Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: Noise occurs. 

NG: REPLACE NAVIGATION RECEIVER ASSEMBLY  (See REMOVAL )

OK: Go to next step 

1. Check for continuity of the antenna.

   HINT:

   Check for continuity at the center of each antenna wire as shown in the illustration.

   NOTE: When cleaning the glass, wipe it in the direction of the wire with a soft dry cloth. Take care not to damage the wire. Do not use detergents or glass cleaners with abrasive ingredients. When measuring resistance, wrap a piece of tin foil around the tip of the negative probe and press the foil against the wire with your finger, as shown in the illustration.

   OK: There is continuity in the antenna. 

NG: REPAIR GLASS ANTENNA  (See WINDOW GLASS ANTENNA WIRE )

Fig 2: Checking Continuity Of Antenna

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step 

1. Disconnect navigation receiver assembly connector.
2. Disconnect antenna amplifier connector.
3. Measure the resistance according to the value(s) in the table below.

Standard Resistance 

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 3: Identifying Navigation Receiver Assembly Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step 

1. Reconnect navigation receiver assembly connector.
2. Measure the voltage according to the value(s) in the table below.

Standard Voltage 

NG: REPLACE NAVIGATION RECEIVER ASSEMBLY  (See REMOVAL )

Fig 4: Identifying Antenna Amplifier Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next step 

1. Remove the antenna plug of the navigation receiver assembly and antenna.
2. Measure the resistance between the antenna and navigation receiver assembly to check for an open circuit in the antenna cord.

   Standard Resistance: Below 1 Ω 

3. Measure the resistance between the antenna cord and body ground to check for a short circuit in the antenna cord.

   Standard Resistance: 10 kΩ or higher 

NG: REPLACE ANTENNA CORD  (See REMOVAL )

OK: Go to next step 

1. Replace the antenna amplifier and check if radio broadcasts can be received normally (See REMOVAL ).

   OK: Radio broadcasts can be received. 

NG: REPLACE NAVIGATION RECEIVER ASSEMBLY  (See REMOVAL )

OK: NORMAL OPERATION