DTC B124A:14 [BODY CONTROL MODULE (BCM)]

id0902r7113600

Warning

<<High voltage>>

• Always observe the following thoroughly to ensure safety when inspecting or removing/installing parts in the motor compartment. Otherwise, the high voltage circuit may operate on the vehicle regardless of whether or not the main power is switched OFF or ON (READY off or on). If this occurs, it could cause electrical shock and result in serious injury or, in the worst case, death.

― Do not select high voltage battery cooling on center display after EV system stops

― Do not open/close doors frequently with main power switched OFF

― Do not perform normal charging or quick charging

― Switch to connected vehicle maintenance mode (MyMazda App connected vehicle)

― Cancel climate control timer

― Operate center display and turn off battery heater operation

Warning

• The cooling fan may suddenly start operating regardless of the main power switch position. Keep hands and tools away from the cooling fan even if the cooling fan is not operating to prevent injury, or damage to the cooling fan. When servicing the cooling fan or parts near the cooling fan, ensure the following.

― Do not perform normal charging or quick charging

― Do not select high voltage battery cooling on center display after EV system stops

― Do not open/close doors frequently with main power switched OFF

― Switch to connected vehicle maintenance mode (MyMazda App connected vehicle)

― Cancel climate control timer

― Operate center display and turn off battery heater operation

Outline

System malfunction location

Front combination light (RH) internal malfunction

Detection condition

•  The body control module (BCM) detects the front combination light (RH) internal malfunction for 2 s or more.

Preconditions:

•  The daytime running light (DRL) is illuminated.

Fail-safe

•  Turn off the running light (RH).

Possible cause

•  Front combination light (RH) internal malfunction

•  Body control module (BCM) malfunction

System wiring diagram

Not applicable

Connector diagram

Not applicable

System malfunction location	Front combination light (RH) internal malfunction
Detection condition	• The body control module (BCM) detects the front combination light (RH) internal malfunction for 2 s or more. Preconditions: • The daytime running light (DRL) is illuminated.
Fail-safe	• Turn off the running light (RH).
Possible cause	• Front combination light (RH) internal malfunction • Body control module (BCM) malfunction
System wiring diagram	Not applicable
Connector diagram	Not applicable

Diagnostic Procedure

Step

Inspection

Results

Action

1

INSPECT FRONT COMBINATION LIGHT (RH) FOR MALFUNCTION

•  Clear the DTC recorded in the memory.
(See CLEARING DTC.)

•  Illuminate the daytime running light (DRL) and wait for 2 s or more.

•  Perform the DTC inspection for the body control module (BCM).
(See DTC INSPECTION.)

•  Is the same Pending DTC present?

Yes

Repair or replace the malfunctioning location and perform the repair completion verification.

(See FRONT COMBINATION LIGHT REMOVAL/INSTALLATION.)

No

Go to repair completion verification 2.

Repair completion verification 1

VERIFY THAT VEHICLE IS REPAIRED

•  Install/connect the part removed/disconnected during the troubleshooting procedure.

•  Clear the DTC recorded in the memory.
(See CLEARING DTC.)

•  Illuminate the daytime running light (DRL) and wait for 2 s or more.

•  Perform the DTC inspection for the body control module (BCM).
(See DTC INSPECTION.)

•  Is the same Pending DTC present?

Yes

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [L.H.D. (E)].)

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [R.H.D.].)

If the CAN communication is normal, perform the diagnosis from Step 1.

•  If the malfunction recurs, replace the body control module (BCM), then go to the next step.
(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)

No

Go to the next step.

Repair completion verification 2

VERIFY IF OTHER DTC IS DISPLAYED

•  Perform the DTC inspection.
(See DTC INSPECTION.)

•  Are any other DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

No

DTC troubleshooting completed.

Step	Inspection	Results	Action
1	INSPECT FRONT COMBINATION LIGHT (RH) FOR MALFUNCTION • Clear the DTC recorded in the memory. (See CLEARING DTC.) • Illuminate the daytime running light (DRL) and wait for 2 s or more. • Perform the DTC inspection for the body control module (BCM). (See DTC INSPECTION.) • Is the same Pending DTC present?	Yes	Repair or replace the malfunctioning location and perform the repair completion verification. (See FRONT COMBINATION LIGHT REMOVAL/INSTALLATION.)
1		No	Go to repair completion verification 2.
Repair completion verification 1	VERIFY THAT VEHICLE IS REPAIRED • Install/connect the part removed/disconnected during the troubleshooting procedure. • Clear the DTC recorded in the memory. (See CLEARING DTC.) • Illuminate the daytime running light (DRL) and wait for 2 s or more. • Perform the DTC inspection for the body control module (BCM). (See DTC INSPECTION.) • Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [L.H.D. (E)].) (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [R.H.D.].) If the CAN communication is normal, perform the diagnosis from Step 1. • If the malfunction recurs, replace the body control module (BCM), then go to the next step. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)
Repair completion verification 1		No	Go to the next step.
Repair completion verification 2	VERIFY IF OTHER DTC IS DISPLAYED • Perform the DTC inspection. (See DTC INSPECTION.) • Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
Repair completion verification 2		No	DTC troubleshooting completed.