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DTC B1477:16 [EMERGENCY CALL UNIT]

id0902s6125900

Outline

System malfunction location

Built-in battery malfunction

Detection condition

•  The emergency call unit detects the built-in battery voltage of less than 5.5 V.

Fail-safe

Not applicable

Possible cause

•  Low built-in battery level

•  Emergency call unit malfunction

System wiring diagram

Not applicable

Connector diagram

Not applicable

System malfunction location	Built-in battery malfunction
Detection condition	• The emergency call unit detects the built-in battery voltage of less than 5.5 V.
Fail-safe	Not applicable
Possible cause	• Low built-in battery level • Emergency call unit malfunction
System wiring diagram	Not applicable
Connector diagram	Not applicable

Diagnostic Procedure

Step

Inspection

Results

Action

1

VERIFY IF MALFUNCTIONING LOCATION IS BUILT-IN BATTERY DEPENDING ON REPEATABILITY

•  Clear the DTC for the emergency call unit using the M-MDS.
(See CLEARING DTC.)

•  Retrieve the emergency call unit DTCs using the M-MDS.
(See DTC INSPECTION.)

•  Is the same Pending DTC present?

Yes

Replace the built-in battery, then go to the next step.

(See EMERGENCY CALL UNIT BATTERY REMOVAL/INSTALLATION.)

No

Go to the next step.

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.)

•  Perform the DTC inspection for the emergency call unit.
(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 [(E)].)

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

•  If the malfunction recurs, replace the emergency call unit, then go to the next step.
(See EMERGENCY CALL UNIT 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	VERIFY IF MALFUNCTIONING LOCATION IS BUILT-IN BATTERY DEPENDING ON REPEATABILITY • Clear the DTC for the emergency call unit using the M-MDS. (See CLEARING DTC.) • Retrieve the emergency call unit DTCs using the M-MDS. (See DTC INSPECTION.) • Is the same Pending DTC present?	Yes	Replace the built-in battery, then go to the next step. (See EMERGENCY CALL UNIT BATTERY REMOVAL/INSTALLATION.)
1		No	Go to the next step.
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.) • Perform the DTC inspection for the emergency call unit. (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 [(E)].) If the CAN communication is normal, perform the diagnosis from Step 1. • If the malfunction recurs, replace the emergency call unit, then go to the next step. (See EMERGENCY CALL UNIT 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.