Inspection Procedure

CHECK NAVIGATION RECEIVER ASSEMBLY
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 )
CHECK OPTIONAL COMPONENTS
1. Check optional components (window tint film, telephone antenna, etc.).
  1. Check if any optional components that may decrease reception capacity, such as window tint 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 NOTE ABOVE)
CHECK NAVIGATION RECEIVER ASSEMBLY
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 speakers.
    
    Fig 1: Checking Navigation Receiver Assembly
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    OK: Noise occurs .
    
    NG: REPLACE NAVIGATION RECEIVER ASSEMBLY (See REMOVAL )
    
    OK: Go to Next Step
CHECK ROOF ANTENNA
1. Check that the roof antenna is securely installed.
  OK: The roof antenna is installed properly .
  
  NG: REINSTALL OR REPLACE ROOF ANTENNA (See REMOVAL )
  
  OK: Go to Next Step

CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - ANTENNA AMPLIFIER)

Disconnect the navigation receiver assembly connector.
Disconnect the antenna amplifier connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance

STANDARD RESISTANCE REFERENCE CHART

Tester Connection	Condition	Specified Condition
E1-8 (ANT) - E3-1 (B)	Always	Below 1 Ω
E1-8 (ANT) - Body ground	Always	10 kΩ or higher

Fig 2: Identifying E1 Navigation Receiver Assembly And E3 Antenna Amplifier Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

INSPECT NAVIGATION RECEIVER ASSEMBLY

Reconnect the navigation receiver assembly connector.

Measure the voltage according to the value(s) in the table below.

Standard Voltage

STANDARD VOLTAGE REFERENCE CHART

Tester Connection	Condition	Specified Condition
E3-1 (B) - Body ground	Ignition switch ON Radio switch ON	11 to 14 V

Fig 3: Identifying E3 Antenna Amplifier Connector

NG: REPLACE NAVIGATION RECEIVER ASSEMBLY (See REMOVAL )

OK: Go to Next Step

CHECK ANTENNA CORD
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
REPLACE ANTENNA AMPLIFIER
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