VEHICLE HAS POOR WAVE SIGNAL RECEPTION SENSITIVITY [EMERGENCY CALL SYSTEM (E)]

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Note

• Before starting the symptom troubleshooting, verify the [Troubleshooting Procedure for Emergency Call System].

(See FOREWORD [EMERGENCY CALL SYSTEM (E)].)

Outline

Description

•  The out of range or a low radio wave strength level is displayed even though the vehicle is in a good radio signal reception area.

Possible cause

•  Connector or terminal malfunction of the following parts:

―  Emergency call unit

―  TEL antenna No.1

―  TEL antenna No.2

•  Short to power supply, short to ground, or open circuit in TEL antenna No.1 signal circuit

•  Short to power supply, short to ground, or open circuit in TEL antenna No.2 signal circuit

•  TEL antenna No.1 malfunction

•  TEL antenna No.2 malfunction

•  Emergency call unit malfunction

Diagnostic Procedure

Step

Inspection

Results

Action

1

VERIFY ALL SYSTEM DTCs

•  Perform the DTC inspection.
(See DTC INSPECTION.)

•  Are any DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

No

Go to the next step.

2

INSPECT EMERGENCY CALL UNIT, TEL ANTENNA NO.1, AND TEL ANTENNA NO.2 CONNECTORS 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 TEL ANTENNA NO.1 SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY, SHORT TO GROUND, AND OPEN CIRCUIT

•  Inspect the signal circuit for a short to power supply, short to ground, and an open circuit.
(See CIRCUIT 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 TEL ANTENNA NO.2 SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY, SHORT TO GROUND, AND OPEN CIRCUIT

•  Inspect the signal circuit for a short to power supply, short to ground, and an open circuit.
(See CIRCUIT 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.

Repair completion verification1

VERIFY THAT VEHICLE IS REPAIRED

•  Install/connect the part removed/disconnected during the troubleshooting procedure.

•  Has the malfunction symptom been eliminated?

Yes

Complete the symptom troubleshooting. (Explain contents of repair to customer)

No

Disconnect the TEL antenna No.1 connector and verify the PIDs using the M-MDS.

(See PID/DATA MONITOR INSPECTION.)

Emergency call unit

―  TEL1_ANT_3LVL

―  TEL2_ANT_3LVL

If the PIDs indicates out of range:

•  Replace the TEL antenna No.2, then go to the next step.
(See TEL ANTENNA REMOVAL/INSTALLATION [(E)].)

If the PIDs does not indicate out of range:

•  Go to the next step.

Repair completion verification2

VERIFY THAT VEHICLE IS REPAIRED

•  Install/connect the part removed/disconnected during the troubleshooting procedure.

•  Has the malfunction symptom been eliminated?

Yes

Complete the symptom troubleshooting. (Explain contents of repair to customer)

No

Replace the TEL antenna No.1, then go to the next step.

(See TEL ANTENNA REMOVAL/INSTALLATION [(E)].)

Repair completion verification3

VERIFY THAT VEHICLE IS REPAIRED

•  Install/connect the part removed/disconnected during the troubleshooting procedure.

•  Has the malfunction symptom been eliminated?

Yes

Complete the symptom troubleshooting. (Explain contents of repair to customer)

No

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 is not resolved, replace the emergency call unit.
(See EMERGENCY CALL UNIT REMOVAL/INSTALLATION [(E)] .)

Description	• The out of range or a low radio wave strength level is displayed even though the vehicle is in a good radio signal reception area.
Possible cause	• Connector or terminal malfunction of the following parts: ― Emergency call unit ― TEL antenna No.1 ― TEL antenna No.2 • Short to power supply, short to ground, or open circuit in TEL antenna No.1 signal circuit • Short to power supply, short to ground, or open circuit in TEL antenna No.2 signal circuit • TEL antenna No.1 malfunction • TEL antenna No.2 malfunction • Emergency call unit malfunction

Step	Inspection	Results	Action
1	VERIFY ALL SYSTEM DTCs • Perform the DTC inspection. (See DTC INSPECTION.) • Are any DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
1		No	Go to the next step.
2	INSPECT EMERGENCY CALL UNIT, TEL ANTENNA NO.1, AND TEL ANTENNA NO.2 CONNECTORS 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 TEL ANTENNA NO.1 SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY, SHORT TO GROUND, AND OPEN CIRCUIT • Inspect the signal circuit for a short to power supply, short to ground, and an open circuit. (See CIRCUIT 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	INSPECT TEL ANTENNA NO.2 SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY, SHORT TO GROUND, AND OPEN CIRCUIT • Inspect the signal circuit for a short to power supply, short to ground, and an open circuit. (See CIRCUIT INSPECTION.) • Are the connector and terminal normal?	Yes	Go to the next step.
4		No	Repair or replace the malfunctioning location and perform the repair completion verification.
Repair completion verification1	VERIFY THAT VEHICLE IS REPAIRED • Install/connect the part removed/disconnected during the troubleshooting procedure. • Has the malfunction symptom been eliminated?	Yes	Complete the symptom troubleshooting. (Explain contents of repair to customer)
Repair completion verification1		No	Disconnect the TEL antenna No.1 connector and verify the PIDs using the M-MDS. (See PID/DATA MONITOR INSPECTION.) Emergency call unit ― TEL1_ANT_3LVL ― TEL2_ANT_3LVL If the PIDs indicates out of range: • Replace the TEL antenna No.2, then go to the next step. (See TEL ANTENNA REMOVAL/INSTALLATION [(E)].) If the PIDs does not indicate out of range: • Go to the next step.
Repair completion verification2	VERIFY THAT VEHICLE IS REPAIRED • Install/connect the part removed/disconnected during the troubleshooting procedure. • Has the malfunction symptom been eliminated?	Yes	Complete the symptom troubleshooting. (Explain contents of repair to customer)
Repair completion verification2		No	Replace the TEL antenna No.1, then go to the next step. (See TEL ANTENNA REMOVAL/INSTALLATION [(E)].)
Repair completion verification3	VERIFY THAT VEHICLE IS REPAIRED • Install/connect the part removed/disconnected during the troubleshooting procedure. • Has the malfunction symptom been eliminated?	Yes	Complete the symptom troubleshooting. (Explain contents of repair to customer)
Repair completion verification3		No	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 is not resolved, replace the emergency call unit. (See EMERGENCY CALL UNIT REMOVAL/INSTALLATION [(E)] .)