Toyota Corolla Cross: Stereo Component Amplifier Missing Message (B15A387)

DESCRIPTION

This DTC is stored when the radio and display receiver assembly detects that the stereo component amplifier assembly has disconnected.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	DTC Output from	Priority
B15A387	Stereo Component Amplifier Missing Message	When 60 seconds has elapsed after turning the ignition switch to ON and the stereo component amplifier assembly cannot be detected, the stereo component amplifier assembly is judged to be disconnected after comparison with the past registered devices history. (2 trip detection logic)	Radio and display receiver assembly Stereo component amplifier assembly Harness or connector	Navigation System	A

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

• Inspect the fuses for circuits related to this system before performing the following procedure.
• Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed.

  Click here

HINT:

There may be a communication malfunction due to noise affecting communication between devices on the AVC-LAN.

PROCEDURE

1.	CHECK MODEL

Result	Proceed to
for HEV Model	A
for Gasoline Model	B

B

GO TO STEP 7

A

2.	CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - POWER SOURCE AND BODY GROUND)

(a) Disconnect the I233 stereo component amplifier assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
I233-3 (GND) - Body ground	Always	Below 1 Ω
I233-18 (GND2) - Body ground	Always	Below 1 Ω

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
I233-1 (+B) - Body ground	Always	11 to 14 V
I233-16 (+B2) - Body ground	Always	11 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.	CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY)

(a) Disconnect the I253 radio and display receiver assembly connector.

(b) Disconnect the stereo component amplifier assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
I253-1 (TX1+) - I234-8 (TX+)	Always	Below 1 Ω
I253-2 (TX1-) - I234-7 (TX-)	Always	Below 1 Ω
I253-1 (TX1+) - Body ground	Always	10 kΩ or higher
I253-2 (TX1-) - Body ground	Always	10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.	REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY

(a) Replace the stereo component amplifier assembly with a new or known good one.

Click here

NEXT

5.

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Navigation System > Clear DTCs

NEXT

6.	CHECK FOR DTC

(a) Turn the ignition switch off.

(b) Turn the ignition switch to ON and wait for 60 seconds.

(c) Turn the ignition switch off.

(d) Turn the ignition switch to ON and wait for 60 seconds.

(e) Check for DTCs and proceed to the following step.

Body Electrical > Navigation System > Trouble Codes

Result	Proceed to
DTCs are not output	A
DTC B15A387 is output	B

A

END (STEREO COMPONENT AMPLIFIER ASSEMBLY IS DEFECTIVE)

B

REPLACE RADIO & DISPLAY RECEIVER ASSEMBLY

7.	CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - POWER SOURCE AND BODY GROUND)

(a) Disconnect the I233 stereo component amplifier assembly connector

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
I233-3 (GND) - Body ground	Always	Below 1 Ω
I233-18 (GND2) - Body ground	Always	Below 1 Ω

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
I233-1 (+B) - Body ground	Always	10.5 to 14 V
I233-16 (+B2) - Body ground	Always	10.5 to 14 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

8.	CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY)

(a) Disconnect the I253 radio and display receiver assembly connector.

(b) Disconnect the stereo component amplifier assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
I253-1 (TX1+) - I234-8 (TX+)	Always	Below 1 Ω
I253-2 (TX1-) - I234-7 (TX-)	Always	Below 1 Ω
I253-1 (TX1+) - Body ground	Always	10 kΩ or higher
I253-2 (TX1-) - Body ground	Always	10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

9.	REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY

(a) Replace the stereo component amplifier assembly with a new or known good one.

Click here

NEXT

10.

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Navigation System > Clear DTCs

NEXT

11.	CHECK FOR DTC

(a) Turn the ignition switch off.

(b) Turn the ignition switch to ON and wait for 60 seconds.

(c) Turn the ignition switch off.

(d) Turn the ignition switch to ON and wait for 60 seconds.

(e) Check for DTCs and proceed to the following step.

Body Electrical > Navigation System > Trouble Codes

Result	Proceed to
DTCs are not output	A
DTC B15A387 is output	B

A

END (STEREO COMPONENT AMPLIFIER ASSEMBLY IS DEFECTIVE)

B

REPLACE RADIO & DISPLAY RECEIVER ASSEMBLY

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