Radio Broadcast Cannot be Received or Poor Reception

NAVIGATION: NAVIGATION SYSTEM: Radio Broadcast cannot be Received or Poor Reception
- Radio Broadcast cannot be Received or Poor Reception

INSPECTION PROCEDURE

PROCEDURE

1. CHECK NAVIGATION RECEIVER ASSEMBLY

(a) Check the radio automatic station search function.

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

Result:

B -- REPLACE NAVIGATION RECEIVER ASSEMBLY Removal
A -- Continue to next step.

2. CHECK OPTIONAL COMPONENTS

(a) 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.

Result:

NOTICE:
Do not remove optional components without the permission of the customer.

B -- CHECK NAVIGATION RECEIVER ASSEMBLY

A -- REMOVE OPTIONAL COMPONENTS AND CHECK AGAIN (SEE NOTICE ABOVE)

3. CHECK NAVIGATION RECEIVER ASSEMBLY

(a) Preparation for check

(1) Remove the antenna plug from the navigation receiver assembly.

(b) 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.

OK:

Noise occurs.

NG -- REPLACE NAVIGATION RECEIVER ASSEMBLY Removal
OK -- Continue to next step.

4. CHECK GLASS ANTENNA

(a) Check for continuity of the antenna.

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

NOTICE:
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 Service and Repair
OK -- Continue to next step.

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

(a) Disconnect the navigation receiver assembly connector (for 8 Speakers).

(b) Disconnect the navigation receiver assembly connector (for 6 Speakers).

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

Standard Resistance:

Text in Illustration

*4: for 8 Speakers

*5: for 6 Speakers

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

6. INSPECT NAVIGATION RECEIVER ASSEMBLY

(a) Reconnect the navigation receiver assembly connector.

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

Standard Voltage:

Text in Illustration

NG -- REPLACE NAVIGATION RECEIVER ASSEMBLY Removal
OK -- Continue to next step.

7. CHECK ANTENNA CORD

(a) Remove the antenna plug of the navigation receiver assembly and antenna.

(b) Measure the resistance between the antenna and navigation receiver assembly to check for an open circuit in the antenna cord.

Standard Resistance:

Below 1 Ohms

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

Standard Resistance:

10 kOhms or higher

NG -- REPLACE ANTENNA CORD Removal
OK -- Continue to next step.

8. REPLACE ANTENNA AMPLIFIER

(a) Replace the antenna amplifier and check if radio broadcasts can be received normally Removal.

OK:

Radio broadcasts can be received.

NG -- REPLACE NAVIGATION RECEIVER ASSEMBLY Removal

OK -- NORMAL OPERATION