Toyota CH-R Service Manual: Speaker Circuit

DESCRIPTION

If there is a short in a speaker circuit, the radio receiver assembly detects it and stops output to the speakers.

Thus sound cannot be heard from the speakers even if there is no malfunction in the radio receiver assembly or speakers.

WIRING DIAGRAM

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - SPEAKERS)

(a) Disconnect the F48 and F49 radio receiver assembly connectors.

(b) Disconnect the I1 and J1 front No. 1 speaker assembly connectors.

(c) Disconnect the F85 and F86 front No. 2 speaker assembly connectors.

(d) Disconnect the K4 and L4 rear speaker assembly connectors.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F48-1 (FR+) - F85-4 (TWR+)

Always

Below 1 Ω

F48-5 (FR-) - F85-2 (TWR-)

Always

Below 1 Ω

F85-3 (+) - I1-1

Always

Below 1 Ω

F85-1 (-) - I1-2

Always

Below 1 Ω

F48-2 (FL+) - F86-4 (TWL+)

Always

Below 1 Ω

F48-6 (FL-) - F86-2 (TWL-)

Always

Below 1 Ω

F86-3 (+) - J1-1

Always

Below 1 Ω

F86-1 (-) - J1-2

Always

Below 1 Ω

F49-1 (RR+) - K4-1

Always

Below 1 Ω

F49-3 (RR-) - K4-2

Always

Below 1 Ω

F49-2 (RL+) - L4-1

Always

Below 1 Ω

F49-6 (RL-) - L4-2

Always

Below 1 Ω

F48-1 (FR+) or F85-4 (TWR+) - Body ground

Always

10 kΩ or higher

F48-5 (FR-) or F85-2 (TWR-) - Body ground

Always

10 kΩ or higher

F85-3 (+) or I1-1 - Body ground

Always

10 kΩ or higher

F85-1 (-) or I1-2 - Body ground

Always

10 kΩ or higher

F48-2 (FL+) or F86-4 (TWL+) - Body ground

Always

10 kΩ or higher

F48-6 (FL-) or F86-2 (TWL-) - Body ground

Always

10 kΩ or higher

F86-3 (+) or J1-1 - Body ground

Always

10 kΩ or higher

F86-1 (-) or J1-2 - Body ground

Always

10 kΩ or higher

F49-1 (RR+) or K4-1 - Body ground

Always

10 kΩ or higher

F49-3 (RR-) or K4-2 - Body ground

Always

10 kΩ or higher

F49-2 (RL+) or L4-1 - Body ground

Always

10 kΩ or higher

F49-6 (RL-) or L4-2 - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2.

INSPECT FRONT NO. 1 SPEAKER ASSEMBLY

(a) Remove the front No. 1 speaker assembly.

Click here

(b) Inspect the front No. 1 speaker assembly.

Click here

NG

REPLACE FRONT NO. 1 SPEAKER ASSEMBLY

OK

3.

INSPECT FRONT NO. 2 SPEAKER ASSEMBLY

(a) Remove the front No. 2 speaker assembly.

Click here

(b) Inspect the front No. 2 speaker assembly.

Click here

NG

REPLACE FRONT NO. 2 SPEAKER ASSEMBLY

OK

4.

REPLACE FRONT NO. 2 SPEAKER ASSEMBLY

(a) Check that the malfunction disappears when a known good speaker is installed.

Click here

OK:

Malfunction disappears.

HINT:

  • Connect all the connectors to the front No. 2 speaker assemblies that were disconnected.
  • When there is a possibility that either the right or left front No. 2 speaker assembly is defective, inspect by interchanging the right one with the left one.
  • Perform the above inspection on both LH and RH sides.
OK

END (FRONT NO. 2 SPEAKER ASSEMBLY WAS DEFECTIVE)

NG

5.

INSPECT REAR SPEAKER ASSEMBLY

(a) Remove the rear speaker assembly.

Click here

(b) Inspect the rear speaker assembly.

Click here

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPLACE REAR SPEAKER ASSEMBLY

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