Toyota 4Runner: Speaker Circuit

Toyota 4Runner Service Manual / Audio / Visual / Telematics / Audio / Video / Audio And Visual System / Speaker Circuit

DESCRIPTION

If there is a short in a speaker circuit, the radio and display 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 and display receiver assembly or speakers.

If a short is detected in a speaker circuit, no sound can be heard from the speakers.

WIRING DIAGRAM

PROCEDURE

1.	CHECK SPEAKER (OPERATION CHECK)

(a) Enter the "System Check Mode" screen. Refer to Check Speaker in Operation Check (See page ).

(b) Perform the operation check above and determine the speaker that is not operating.

Not Operating Speaker	Proceed to
Front No. 1 speaker assembly or front No. 2 speaker assembly	A
Rear speaker assembly or rear No. 2 speaker assembly	B

HINT:

If sound cannot be heard from any speaker, inspect all of them.

GO TO STEP 5

2.	CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER - FRONT NO. 1 SPEAKER - FRONT NO. 2 SPEAKER)

(a) Disconnect the G48 radio and display receiver assembly connector.

(b) Disconnect the H1 and I1 front No. 1 speaker assembly connectors.

(d) Measure the resistance between each of the front No. 2 speaker assemblies and the radio and display receiver assembly to check for an open circuit in the wire harness.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G48-1 (FR+) - G10-1 (+)	Always	Below 1 Ω
G48-2 (FL+) - G1-1 (+)	Always	Below 1 Ω
G48-5 (FR-) - G10-3 (-)	Always	Below 1 Ω
G48-6 (FL-) - G1-3 (-)	Always	Below 1 Ω

(e) Measure the resistance between each of the front No. 1 speaker assemblies and the front No. 2 speaker assemblies to check for an open circuit in the wire harness.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G1-2 (TWL+) - I1-1	Always	Below 1 Ω
G1-4 (TWL-) - I1-2	Always	Below 1 Ω
G10-2 (TWR+) - H1-1	Always	Below 1 Ω
G10-4 (TWR-) - H1-2	Always	Below 1 Ω

(f) Measure the resistance between the radio and display receiver assembly and body ground to check for a short circuit in the wire harness.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G48-1 (FR+) - Body ground	Always	10 kΩ or higher
G48-2 (FL+) - Body ground	Always	10 kΩ or higher
G48-5 (FR-) - Body ground	Always	10 kΩ or higher
G48-6 (FL-) - Body ground	Always	10 kΩ or higher

(g) Measure the resistance between each of the front No. 2 speaker assemblies and body ground to check for a short circuit in the wire harness.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G1-2 (TWL+) - Body ground	Always	10 kΩ or higher
G1-4 (TWL-) - Body ground	Always	10 kΩ or higher
G10-2 (TWR+) - Body ground	Always	10 kΩ or higher
G10-4 (TWR-) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT FRONT NO. 1 SPEAKER ASSEMBLY

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
H1-1 - H1-2	Always	4 Ω
I1-1 - I1-2	Always	4 Ω

Text in Illustration

Component without harness connected

(Front No. 1 Speaker Assembly)

for RH

for LH

REPLACE FRONT NO. 1 SPEAKER ASSEMBLY

4.	REPLACE FRONT NO. 2 SPEAKER ASSEMBLY

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

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 speaker is defective, inspect by interchanging the right one with the left one.
Perform the above inspection on both LH and RH sides.

END (FRONT NO. 2 SPEAKER ASSEMBLY WAS DEFECTIVE)

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

5.	CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER - REAR SPEAKER - REAR NO. 2 SPEAKER)

(a) Disconnect the G47 radio and display receiver assembly connector.

(b) Disconnect the J1 and K1 rear speaker assembly connectors.

(d) Measure the resistance between each of the rear speaker assemblies and the radio and display receiver assembly, the rear No. 2 speaker assemblies and the display receiver assembly, and the rear speaker assemblies and the rear No. 2 speaker assemblies to check for an open circuit in the wire harness.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G47-1 (RR+) - J1-1	Always	Below 1 Ω
G47-2 (RL+) -K1-1	Always	Below 1 Ω
G47-3 (RR-) - W5-2	Always	Below 1 Ω
G47-6 (RL-) -W6-2	Always	Below 1 Ω
J1-2 - W5-1	Always	Below 1 Ω
K1-2 - W6-1	Always	Below 1 Ω

(e) Measure the resistance between the radio and display receiver assembly and body ground to check for a short circuit in the wire harness.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G47-1 (RR+) - Body ground	Always	10 kΩ or higher
G47-2 (RL+) - Body ground	Always	10 kΩ or higher
G47-3 (RR-) - Body ground	Always	10 kΩ or higher
G47-6 (RL-) - Body ground	Always	10 kΩ or higher

(f) Measure the resistance between the rear No. 2 speaker assemblies and body ground to check for a short circuit in the wire harness.

Standard Resistance:

Tester Connection	Condition	Specified Condition
J1-2 - Body ground	Always	10 kΩ or higher
K1-2 - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	INSPECT REAR SPEAKER ASSEMBLY

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
J1-1 - J1-2	Always	4 Ω
K1-1 - K1-2	Always	4 Ω

Text in Illustration

Component without harness connected

(Rear No. 1 Speaker Assembly)

for RH

for LH

REPLACE REAR SPEAKER ASSEMBLY

7.	INSPECT REAR NO. 2 SPEAKER ASSEMBLY

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
W5-1 - W5-2	Always	4 Ω
W6-1 - W6-2	Always	4 Ω

Text in Illustration

Component without harness connected

(Rear No. 2 Speaker Assembly)

for RH

for LH

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPLACE REAR NO. 2 SPEAKER ASSEMBLY

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