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DTC B1477:14 [EMERGENCY CALL UNIT]

id0902s6125800

Outline

System malfunction location

Built-in battery malfunction

Detection condition

•  The emergency call unit detects an open circuit or a short to ground in the built-in battery circuit.

Fail-safe

Not applicable

Possible cause

•  Built-in battery assembly incorrect

•  Built-in battery connector or terminal malfunction

•  Emergency call unit connector or terminal malfunction

•  Built-in battery malfunction

•  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 an open circuit or a short to ground in the built-in battery circuit.
Fail-safe	Not applicable
Possible cause	• Built-in battery assembly incorrect • Built-in battery connector or terminal malfunction • Emergency call unit connector or terminal malfunction • Built-in battery malfunction • Emergency call unit malfunction
System wiring diagram	Not applicable
Connector diagram	Not applicable

Diagnostic Procedure

Step

Inspection

Results

Action

1

INSPECT BUILT-IN BATTERY INSTALLATION CONDITION

•  Switch the ignition off.

•  Disconnect the negative battery terminal.

(See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].)

•  Inspect built-in battery installation condition.

•  Is the built-in battery correctly installed?

Yes

Go to the next step.

No

Correctly install the built-in battery and perform the repair completion verification.

2

INSPECT BUILT-IN BATTERY 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.

3

INSPECT EMERGENCY CALL UNIT 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

VERIFY BUILT-IN BATTERY VOLTAGE

•  Display PID BACKUP_BATT_STAT using the M-MDS.
(See PID/DATA MONITOR TABLE [EMERGENCY CALL UNIT].)

•  Is the built-in battery voltage 5.5V or more?

Yes

Go to the next step.

No

Replace the built-in battery, and perform the repair completion verification.

(See EMERGENCY CALL UNIT BATTERY REMOVAL/INSTALLATION.)

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	INSPECT BUILT-IN BATTERY INSTALLATION CONDITION • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION [(E)].) • Inspect built-in battery installation condition. • Is the built-in battery correctly installed?	Yes	Go to the next step.
1		No	Correctly install the built-in battery and perform the repair completion verification.
2	INSPECT BUILT-IN BATTERY CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Are the connector and terminal normal?	Yes	Go to the next step.
2		No	Repair or replace the malfunctioning location and perform the repair completion verification.
3	INSPECT EMERGENCY CALL UNIT CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Are the connector and terminal normal?	Yes	Go to the next step.
3		No	Repair or replace the malfunctioning location and perform the repair completion verification.
4	VERIFY BUILT-IN BATTERY VOLTAGE • Display PID BACKUP_BATT_STAT using the M-MDS. (See PID/DATA MONITOR TABLE [EMERGENCY CALL UNIT].) • Is the built-in battery voltage 5.5V or more?	Yes	Go to the next step.
4		No	Replace the built-in battery, and perform the repair completion verification. (See EMERGENCY CALL UNIT BATTERY REMOVAL/INSTALLATION.)
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.