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DTC B104A:01 [EMERGENCY CALL UNIT]

id0902s6123900

Outline

System malfunction location

Emergency call switch malfunction

Detection condition

•  The emergency call unit detects emergency call switch stuck open or emergency call switch open circuit for 10 min or more.

Fail-safe

Not applicable

Possible cause

•  Emergency call switch connector or terminal malfunction

•  Emergency call unit connector or terminal malfunction

•  Short to power supply in emergency call switch circuit (upstream)

•  Open circuit in emergency call switch circuit (upstream)

•  Emergency call switch malfunction

―  Emergency call switch stuck open

―  Open circuit in emergency call switch internal circuit

•  Emergency call unit malfunction

System malfunction location	Emergency call switch malfunction
Detection condition	• The emergency call unit detects emergency call switch stuck open or emergency call switch open circuit for 10 min or more.
Fail-safe	Not applicable
Possible cause	• Emergency call switch connector or terminal malfunction • Emergency call unit connector or terminal malfunction • Short to power supply in emergency call switch circuit (upstream) • Open circuit in emergency call switch circuit (upstream) • Emergency call switch malfunction ― Emergency call switch stuck open ― Open circuit in emergency call switch internal circuit • Emergency call unit malfunction

Diagnostic Procedure

Step

Inspection

Results

Action

1

INSPECT EMERGENCY CALL SWITCH 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.

2

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.

3

INSPECT EMERGENCY CALL SWITCH CIRCUIT (UPSTREAM) FOR SHORT TO POWER SUPPLY

•  Inspect the applicable circuit for a short to power supply.
(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.

4

INSPECT EMERGENCY CALL SWITCH CIRCUIT (UPSTREAM) FOR OPEN CIRCUIT

•  Inspect the applicable circuit for an open circuit.
(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 EMERGENCY CALL SWITCH FOR MALFUNCTION

•  Inspect the applicable part.
(See EMERGENCY CALL SWITCH 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 EMERGENCY CALL SWITCH 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.)

•  Switch the ignition ON (engine off or on) and wait for 10 min 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 [(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 EMERGENCY CALL SWITCH CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) • Are the connector and terminal normal?	Yes	Go to the next step.
1		No	Repair or replace the malfunctioning location and perform the repair completion verification.
2	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.
2		No	Repair or replace the malfunctioning location and perform the repair completion verification.
3	INSPECT EMERGENCY CALL SWITCH CIRCUIT (UPSTREAM) FOR SHORT TO POWER SUPPLY • Inspect the applicable circuit for a short to power supply. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
3		No	Repair or replace the malfunctioning location and perform the repair completion verification.
4	INSPECT EMERGENCY CALL SWITCH CIRCUIT (UPSTREAM) FOR OPEN CIRCUIT • Inspect the applicable circuit for an open circuit. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
4		No	Repair or replace the malfunctioning location and perform the repair completion verification.
5	INSPECT EMERGENCY CALL SWITCH FOR MALFUNCTION • Inspect the applicable part. (See EMERGENCY CALL SWITCH INSPECTION.) • Is the part normal?	Yes	Go to the next step.
5		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See EMERGENCY CALL SWITCH 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.) • Switch the ignition ON (engine off or on) and wait for 10 min 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 [(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.