DTC U263B:16 [BODY CONTROL MODULE (BCM)]

id0902r7115700

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	Light control module (RH) power supply circuit (IG+) malfunction
Detection condition	•  The light control module (RH) (built into front combination light (RH)) power supply circuit (IG+) voltage is lower than the standard for 10 s or more.
Fail-safe	Not applicable
Possible cause	•  IG1 relay No.2 malfunction and headlight relay malfunction •  Front combination light (RH) connector or terminal malfunction •  Short to ground in front combination light (RH) power supply circuit (IG+) •  Front combination light (RH) internal malfunction •  Body control module (BCM) malfunction

Diagnostic Procedure

Step	Inspection	Results	Action
1	VERIFY BODY CONTROL MODULE (BCM) DTCs AGAIN •  Clear the DTC recorded in the memory. (See CLEARING DTC.) •  Switch the main power ON (READY off or on) and wait for 10 s or more. •  Perform the DTC inspection for the body control module (BCM). (See DTC INSPECTION.) •  Is the same Pending DTC present?	Yes	Go to the next step.
		No	Go to repair completion verification 2.
2	INSPECT IG1 RELAY No.2 AND HEADLIGHT RELAY FOR MALFUNCTION •  Inspect the applicable part. (See RELAY INSPECTION.) •  Is the part normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See RELAY LOCATION [(E)].)
3	INSPECT FRONT COMBINATION LIGHT (RH) CONNECTOR FOR MALFUNCTION •  Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) •  Are the connector and terminal normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
4	INSPECT FRONT COMBINATION LIGHT (RH) POWER SUPPLY CIRCUIT (IG+) FOR SHORT TO GROUND •  Inspect the applicable circuit for a short to ground. (See CIRCUIT INSPECTION.) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
5	INSPECT FRONT COMBINATION LIGHT (RH) FOR MALFUNCTION DEPENDING ON REPEATABILITY •  Install/connect the part removed/disconnected during the troubleshooting procedure. •  Clear the DTC recorded in the memory. (See CLEARING DTC.) •  Switch the main power ON (READY off or on) and wait for 10 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, 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.) •  Switch the main power ON (READY off or on) and wait for 10 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.