Radio Broadcast cannot be Received or Poor Reception
AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM: Radio Broadcast cannot be Received or Poor Reception
- Radio Broadcast cannot be Received or Poor Reception
INSPECTION PROCEDURE
PROCEDURE
1. CHECK RADIO RECEIVER ASSEMBLY
(a) Check the radio automatic station search function.
(1) Check the radio automatic station search function by activating it.
Result:
B -- CHECK OPTIONAL COMPONENTS
A -- REPLACE RADIO RECEIVER ASSEMBLY Removal
2. CHECK OPTIONAL COMPONENTS
(a) Check optional components (sunshade 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 RADIO ANTENNA
A -- REMOVE OPTIONAL COMPONENTS AND CHECK AGAIN (SEE NOTICE ABOVE)
3. CHECK RADIO ANTENNA
(a) Preparation for check
(1) Remove the roof antenna pole sub-assembly from the amplifier antenna assembly.
(b) Check for noise.
(1) Turn the power switch on (ACC) with the radio 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 amplifier antenna threaded installation portion for the roof antenna pole sub-assembly and check that noise can be heard from the speakers.
Result:
B -- REPLACE RADIO RECEIVER ASSEMBLY Removal
A -- Continue to next step.
4. CHECK RADIO RECEIVER ASSEMBLY
(a) Preparation for check
(1) Remove the antenna plug from the radio receiver assembly.
(b) Check for noise.
(1) Turn the power switch on (ACC) with the radio 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 radio receiver assembly antenna jack and check that noise can be heard from the speakers.
OK:
Noise can be heard from the speakers.
NG -- REPLACE RADIO RECEIVER ASSEMBLY Removal
OK -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - AMPLIFIER ANTENNA ASSEMBLY)
(a) Disconnect the radio receiver assembly and amplifier antenna assembly connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for 8 Speakers
except for 8 Speakers
Text in Illustration
*4: for 8 Speakers
*5: except for 8 Speakers
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
6. INSPECT RADIO RECEIVER ASSEMBLY
(a) Reconnect the radio receiver assembly connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Text in Illustration
NG -- REPLACE RADIO RECEIVER ASSEMBLY Removal
OK -- Continue to next step.
7. CHECK ANTENNA CORD
(a) Remove the antenna plug of the radio receiver assembly and antenna.
(b) Measure the resistance between the antenna and radio 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 AMPLIFIER ANTENNA ASSEMBLY
(a) Replace the amplifier antenna assembly and check if radio broadcasts can be received normally. Removal
OK:
Radio broadcasts can be received.
NG -- REPLACE RADIO RECEIVER ASSEMBLY Removal
OK -- NORMAL OPERATION