Radio Broadcast cannot be Received or Poor Reception
AUDIO / VIDEO: AUDIO AND VISUAL SYSTEM (w/o Daytime Running Light): Radio Broadcast cannot be Received or Poor Reception
- Radio Broadcast cannot be Received or Poor Reception
INSPECTION PROCEDURE
PROCEDURE
1. CHECK NAVIGATION ECU SUB-ASSEMBLY
(a) Check the radio automatic station search function.
(1) Check the radio automatic station search function by activating it.
Result:
B -- REPLACE NAVIGATION ECU SUB-ASSEMBLY Removal
A -- Continue to next step.
2. CHECK OPTIONAL COMPONENTS
(a) 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 -- REMOVE OPTIONAL COMPONENTS AND CHECK AGAIN (SEE NOTICE ABOVE)
A -- Continue to next step.
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 navigation ECU sub-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 NAVIGATION ECU SUB-ASSEMBLY Removal
A -- Continue to next step.
4. CHECK NAVIGATION ECU SUB-ASSEMBLY
(a) Preparation for check
(1) Remove the antenna connector from the navigation ECU sub-assembly.
(b) Check for noise
(1) Turn the power switch on (ACC) with the navigation ECU sub-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 ECU sub-assembly antenna jack and check that noise can be heard from the speakers.
OK:
Noise can be heard from the speakers.
NG -- REPLACE NAVIGATION ECU SUB-ASSEMBLY Removal
OK -- Continue to next step.
5. INSPECT NAVIGATION ECU SUB-ASSEMBLY
(a) Disconnect the navigation ECU sub-assembly connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Text in Illustration
NG -- REPLACE NAVIGATION ECU SUB-ASSEMBLY Removal
OK -- Continue to next step.
6. REPLACE NO. 2 ANTENNA CORD SUB-ASSEMBLY
(a) Replace the No. 2 antenna cord sub-assembly and check if radio broadcasts can be received normally Removal.
OK:
Radio broadcasts can be received normally.
NG -- INSPECT NO. 4 ANTENNA CORD SUB-ASSEMBLY
OK -- NORMAL OPERATION
7. INSPECT NO. 4 ANTENNA CORD SUB-ASSEMBLY
(a) Disconnect the No. 4 antenna cord sub-assembly.
(b) Measure the resistance of the No. 4 antenna cord sub-assembly to check for an open circuit in the No. 4 antenna cord sub-assembly.
Standard Resistance:
Below 1 Ohms
(c) Measure the resistance between the No. 4 antenna cord sub-assembly and body ground to check for a short circuit in the No. 4 antenna cord sub-assembly.
Standard Resistance:
10 kOhms or higher
NG -- REPLACE NO. 4 ANTENNA CORD SUB-ASSEMBLY Removal
OK -- Continue to next step.
8. INSPECT NO. 5 ANTENNA CORD SUB-ASSEMBLY
(a) Disconnect the No. 5 antenna cord sub-assembly.
(b) Measure the resistance of the No. 5 antenna cord sub-assembly to check for an open circuit in the No. 5 antenna cord sub-assembly.
Standard Resistance:
Below 1 Ohms
(c) Measure the resistance between the No. 5 antenna cord sub-assembly and body ground to check for a short circuit in the No. 5 antenna cord sub-assembly.
Standard Resistance:
10 kOhms or higher
NG -- REPLACE NO. 5 ANTENNA CORD SUB-ASSEMBLY Removal
OK -- Continue to next step.
9. CHECK ROOF ANTENNA POLE SUB-ASSEMBLY
(a) Check that the roof antenna pole sub-assembly is securely installed Installation.
OK:
The roof antenna pole sub-assembly is installed properly.
NG -- CHECK AND REPLACE ROOF ANTENNA POLE SUB-ASSEMBLY Removal
OK -- Continue to next step.
10. REPLACE AMPLIFIER ANTENNA ASSEMBLY (for Roof)
(a) Replace the amplifier antenna assembly (for Roof) and check if radio broadcasts can be received normally Removal.
OK:
Radio broadcasts can be received normally.
NG -- REPLACE NAVIGATION ECU SUB-ASSEMBLY Removal
OK -- NORMAL OPERATION