DTC B1477:16 [EMERGENCY CALL UNIT (E)]

id0902sc125900

Outline

System malfunction location

Built-in battery malfunction

Detection condition

•  When any of the following conditions is met for 10 s or more.

―  Emergency call unit detects that the remaining battery power of the battery built into the emergency call unit decreased.

―  Emergency call unit detects a malfunction in its built-in battery. (Temporary malfunction which returns to normal through charge/discharge or time elapse)

Fail-safe

Not applicable

Possible cause

•  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	• When any of the following conditions is met for 10 s or more. ― Emergency call unit detects that the remaining battery power of the battery built into the emergency call unit decreased. ― Emergency call unit detects a malfunction in its built-in battery. (Temporary malfunction which returns to normal through charge/discharge or time elapse)
Fail-safe	Not applicable
Possible cause	• 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 FOR MALFUNCTION DEPENDING ON REPEATABILITY

•  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 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 [L.H.D. (E)].)

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

If the CAN communication is normal, replace the built-in battery and perform the repair completion verification.

(See EMERGENCY CALL UNIT BATTERY REMOVAL/INSTALLATION [(E)].)

No

Explain to the customer that this is a temporarily detected DTC and not a malfunction, and then 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 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 [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 emergency call unit, then go to the next step.
(See EMERGENCY CALL UNIT REMOVAL/INSTALLATION [(E)].)

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 FOR MALFUNCTION DEPENDING ON REPEATABILITY • 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 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 [L.H.D. (E)].) (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [R.H.D.].) If the CAN communication is normal, replace the built-in battery and perform the repair completion verification. (See EMERGENCY CALL UNIT BATTERY REMOVAL/INSTALLATION [(E)].)
1		No	Explain to the customer that this is a temporarily detected DTC and not a malfunction, and then 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 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 [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 emergency call unit, then go to the next step. (See EMERGENCY CALL UNIT REMOVAL/INSTALLATION [(E)].)
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.