Toyota CH-R Service Manual: Radio Broadcast cannot be Received or Poor Reception

Toyota CH-R Service Manual / Audio / Video / Audio And Visual System(for Radio And Display Type) / Radio Broadcast cannot be Received or Poor Reception

WIRING DIAGRAM

for TMMT Made

for TMC Made

CAUTION / NOTICE / HINT

NOTICE:

  • Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Audio and Visual System.

    Click here

  • When replacing the radio and display receiver assembly, always replace it with a new one. If a radio and display receiver assembly which was installed to another vehicle is used, the following may occurs:
    • A communication malfunction DTC may be stored.
    • The radio and display receiver assembly may not operate normally.

PROCEDURE

1.

CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY

(a) Check the radio automatic station search function.

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

Result

Proceed to

Automatic station search function does not stop

A

Automatic station search function stops on a station

B
B

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

A

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

Proceed to

Optional components are not installed

A

Optional components are installed

B

NOTICE:

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

B

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

3.

CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY

(a) Preparation for check

(1) Disconnect the antenna connector from the radio and display receiver assembly.

(b) Check for noise

(1) Turn the ignition switch to ACC with the radio and display 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 and display 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 AND DISPLAY RECEIVER ASSEMBLY

OK

4.

INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY

(a) Disconnect the RA radio and display receiver assembly connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

RA-5 (ANT+) - Body ground

Ignition switch ACC

Radio switch on and FM or AM selected

11 to 14 V

*a

Component without harness connected

(Radio and Display Receiver Assembly)
NG

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

OK

5.

REPLACE ANTENNA CORD SUB-ASSEMBLY

(a) Replace the antenna cord sub-assembly with a new or known good one and check if radio broadcasts can be received normally.

Click here

OK:

Radio broadcasts can be received normally.

Result

Proceed to

OK

A

NG (for TMMT Made)

B

NG (for TMC Made)

C
A

END (ANTENNA CORD SUB-ASSEMBLY WAS DEFECTIVE)
C

GO TO STEP 9

B

6.

CHECK NO. 2 ANTENNA CORD SUB-ASSEMBLY

(a) Disconnect the No. 2 antenna cord sub-assembly connector from the antenna cord sub-assembly.

*a

Front view of wire harness connector

(to Antenna Cord Sub-assembly)

*b

Front view of wire harness connector

(to No. 3 Antenna Cord Sub-assembly)

(b) Disconnect the No. 2 antenna cord sub-assembly connector from the No. 3 antenna Cord sub-assembly.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

AB-5 - BC-5

Always

Below 1 Ω

AB-5a - BC-5a

Always

Below 1 Ω

AB-5 - Body ground

Always

10 kΩ or higher

AB-5a - Body ground

Always

10 kΩ or higher
NG

REPLACE NO. 2 ANTENNA CORD SUB-ASSEMBLY

OK

7.

CHECK NO. 3 ANTENNA CORD SUB-ASSEMBLY

(a) Disconnect the No. 3 antenna cord sub-assembly connector from the No. 2 antenna cord sub-assembly.

*a

Front view of wire harness connector

(to No. 2 Antenna Cord Sub-assembly)

*b

Front view of wire harness connector

(to Roof Antenna Assembly)

(b) Disconnect the No. 3 antenna cord sub-assembly connector from the roof antenna assembly.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

BC-5 - CD2

Always

Below 1 Ω

BC-5a - CD-2a

Always

Below 1 Ω

BC-5 - Body ground

Always

10 kΩ or higher

BC-5a - Body ground

Always

10 kΩ or higher
NG

REPLACE NO. 3 ANTENNA CORD SUB-ASSEMBLY

OK

8.

REPLACE ROOF ANTENNA ASSEMBLY

(a) Replace the roof antenna assembly with a new or known good one and check if radio broadcasts can be received normally.

Click here

OK:

Radio broadcasts can be received normally.

OK

END (ROOF ANTENNA ASSEMBLY WAS DEFECTIVE)
NG

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

9.

CHECK NO. 2 ANTENNA CORD SUB-ASSEMBLY

(a) Disconnect the No. 2 antenna cord sub-assembly connector from the antenna cord sub-assembly.

*a

Front view of wire harness connector

(to Antenna Cord Sub-assembly)

*b

Front view of wire harness connector

(to No. 3 Antenna Cord Sub-assembly)

(b) Disconnect the No. 2 antenna cord sub-assembly connector from the No. 3 antenna Cord sub-assembly.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

AB-1 - BC-1

Always

Below 1 Ω

AB-1a - BC-1a

Always

Below 1 Ω

AB-1 - Body ground

Always

10 kΩ or higher

AB-1a - Body ground

Always

10 kΩ or higher
NG

REPLACE NO. 2 ANTENNA CORD SUB-ASSEMBLY

OK

10.

CHECK NO. 3 ANTENNA CORD SUB-ASSEMBLY

(a) Disconnect the No. 3 antenna cord sub-assembly connector from the antenna cord sub-assembly.

*a

Front view of wire harness connector

(to No. 2 Antenna Cord Sub-assembly)

*b

Front view of wire harness connector

(to Roof Antenna Assembly)

(b) Disconnect the No. 3 antenna cord sub-assembly connector from the telephone antenna assembly.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

BC-1 - CD-2

Always

Below 1 Ω

BC-1a - CD-2a

Always

Below 1 Ω

BC-1 - Body ground

Always

10 kΩ or higher

BC-1a - Body ground

Always

10 kΩ or higher
NG

REPLACE NO. 3 ANTENNA CORD SUB-ASSEMBLY

OK

11.

REPLACE ROOF ANTENNA ASSEMBLY

(a) Replace the roof antenna assembly with a new or known good one and check if radio broadcasts can be received normally.

Click here

OK:

Radio broadcasts can be received normally.

OK

END (ROOF ANTENNA ASSEMBLY WAS DEFECTIVE)
NG

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

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