Toyota 4Runner: Speaker Output Short (B15C3)

DESCRIPTION

This DTC is stored when a malfunction occurs in the speakers.

DTC No.	DTC Detection Condition	Trouble Area
B15C3	A short is detected in the speaker output circuit.	Harness or connector Speaker Radio and display receiver assembly

WIRING DIAGRAM

PROCEDURE

CHECK HARNESS AND CONNECTOR

(a) Disconnect the G47 and G48 radio and display receiver assembly connectors.

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

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

(e) Disconnect the W5 and W6 rear No. 2 speaker assembly connectors.

(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
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
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

(h) Measure the resistance between each of the rear speaker assemblies and rear No. 2 speaker assemblies 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

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

REPLACE FRONT NO. 2 SPEAKER ASSEMBLY

(a) Replace the front No. 2 speaker assembly with a known good one (See page ).

(b) Clear the DTCs (See page ).

OK:

No DTCs are output.

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)

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 Speaker Assembly)

for RH

for LH

REPLACE REAR SPEAKER ASSEMBLY

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

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

REPLACE REAR NO. 2 SPEAKER ASSEMBLY

Speaker Output Short (B15C3)

Test yourself