Diagnosis Procedure

WARNING: This page is about a different car, the 2018 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

CHECK SELF-DIAGNOSTIC RESULT OF BCM
With CONSULT

Check "Self Diagnostic Result" of "BCM" using CONSULT.

Are any DTCs detected?

YES

Perform trouble diagnosis for detected DTC. Refer to DTC Index .

NO

GO TO 2 .

CHECK HARNESS CONTINUITY BETWEEN BOSE SPEAKER AMP. AND BCM

Turn ignition switch OFF.
Disconnect BOSE speaker amp. connector B149 and BCM connector M21.

Check the continuity between BOSE speaker amp. connector B149 and BCM connector M21.

BOSE speaker amp.		BCM		Continuity
Connector	Terminal	Connector	Terminal	Continuity
B149	73	M21	21	Yes

Is inspection result normal?

YES

GO TO 3 .

Repair or replace harness or connectors.

CHECK HARNESS CONTINUITY BETWEEN BOSE SPEAKER AMP. AND GROUND

Check the continuity between BOSE speaker amp. connector B149 and ground.

BOSE speaker mp.		Ground	Continuity
Connector	Terminal
B149	73	-	No

Is inspection result normal?

YES

GO TO 4 .

Repair or replace harness or connectors.

CHECK VOLTAGE BETWEEN BOSE SPEAKER AMP. AND GROUND

Check the voltage between BOSE speaker amp. connector B149 and ground.

BOSE speaker amp.

Ground

Voltage

(Approx.)

Connector

Terminal

B149

(-)

0 V

Is inspection result normal?

YES

Replace BOSE speaker amp. Refer to Removal and Installation .

Repair or replace harness or connectors.