DTC U0198:00 [CONNECTIVITY MASTER UNIT (E)]

id1602a10080a4

Outline

System malfunction location

Communication error with emergency call unit

Detection condition

•  The connectivity master unit (CMU) detects a communication interruption or a communication error with emergency call unit for approx. 30 s.

Fail-safe

Not applicable

Possible cause

•  Emergency call unit connector or terminal malfunction

•  Short to ground or open circuit in emergency call unit power supply circuit

•  Open circuit in emergency call unit ground circuit

•  Connectivity master unit (CMU) connector or terminal malfunction

•  Short to power supply, short to ground or open circuit in the circuits between the following connectivity master unit (CMU) and emergency call unit

―  Power supply circuit

―  Signal circuit

―  Ground circuit

•  Malfunction in shield wire of circuits between connectivity master unit (CMU) and emergency call unit

•  Emergency call unit malfunction

•  Connectivity master unit (CMU) malfunction

System malfunction location	Communication error with emergency call unit
Detection condition	• The connectivity master unit (CMU) detects a communication interruption or a communication error with emergency call unit for approx. 30 s.
Fail-safe	Not applicable
Possible cause	• Emergency call unit connector or terminal malfunction • Short to ground or open circuit in emergency call unit power supply circuit • Open circuit in emergency call unit ground circuit • Connectivity master unit (CMU) connector or terminal malfunction • Short to power supply, short to ground or open circuit in the circuits between the following connectivity master unit (CMU) and emergency call unit ― Power supply circuit ― Signal circuit ― Ground circuit • Malfunction in shield wire of circuits between connectivity master unit (CMU) and emergency call unit • Emergency call unit malfunction • Connectivity master unit (CMU) malfunction

Diagnostic Procedure

Step

Inspection

Results

Action

1

VERIFY REPEATABILITY

•  Switch the main power ON (READY off or on).

•  Clear the DTC recorded in the memory.
(Refer to the [CLEARING DTC] in the workshop manual)

•  Switch the main power OFF, and then switch it ON (READY off or on) and wait for 30 s or more.

•  Perform the DTC inspection for the connectivity master unit (CMU).
(Refer to the [DTC INSPECTION] in the workshop manual)

•  Is the same Pending DTC present?

Yes

Go to the next step.

No

Go to repair completion verification 2.

2

INSPECT EMERGENCY CALL UNIT FOR MALFUNCTION

•  Perform the DTC inspection for the emergency call unit.
(Refer to the [DTC INSPECTION] in the workshop manual)

•  Is a DTC displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(Refer to the [DTC TABLE [EMERGENCY CALL UNIT]] in the workshop manual)

No

Go to the next step.

3

VERIFY EMERGENCY CALL UNIT POWER SUPPLY VOLTAGE

•  Measure the voltage at emergency call unit terminal 1AF (vehicle wiring harness side).

•  Is voltage supplied?

Yes

Go to Step 7.

No

Go to the next step.

4

INSPECT EMERGENCY CALL UNIT CONNECTOR FOR MALFUNCTION

•  Inspect the applicable connector and terminal.
(Refer to the [CONNECTOR INSPECTION] in the workshop manual)

•  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.

5

INSPECT EMERGENCY CALL UNIT POWER SUPPLY CIRCUIT FOR SHORT TO GROUND AND OPEN CIRCUIT

•  Inspect the power supply circuit for a short to ground and open circuit.
(Refer to the [CIRCUIT INSPECTION] in the workshop manual)

•  Is the circuit normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning harness or fuse and perform the repair completion verification.

6

INSPECT EMERGENCY CALL UNIT GROUND CIRCUIT FOR OPEN CIRCUIT

•  Inspect the applicable circuit for an open circuit.
(Refer to the [CIRCUIT INSPECTION] in the workshop manual)

•  Is the circuit normal?

Yes

Go to Step 8.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

7

INSPECT EMERGENCY CALL UNIT CONNECTOR FOR MALFUNCTION

•  Inspect the applicable connector and terminal.
(Refer to the [CONNECTOR INSPECTION] in the workshop manual)

•  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.

8

INSPECT CONNECTIVITY MASTER UNIT (CMU) CONNECTOR FOR MALFUNCTION

•  Inspect the applicable connector and terminal.
(Refer to the [CONNECTOR INSPECTION] in the workshop manual)

•  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.

9

INSPECT CIRCUIT BETWEEN CONNECTIVITY MASTER UNIT (CMU) AND EMERGENCY CALL UNIT FOR SHORT TO GROUND

•  Inspect the applicable circuit for a short to ground.
(Refer to the [CIRCUIT INSPECTION] in the workshop manual)

•  Is the circuit normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

10

INSPECT CIRCUIT BETWEEN CONNECTIVITY MASTER UNIT (CMU) AND EMERGENCY CALL UNIT FOR SHORT TO POWER SUPPLY

•  Inspect the applicable circuit for a short to power supply.
(Refer to the [CIRCUIT INSPECTION] in the workshop manual)

•  Is the circuit normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

11

INSPECT CIRCUIT BETWEEN CONNECTIVITY MASTER UNIT (CMU) AND EMERGENCY CALL UNIT FOR OPEN CIRCUIT

•  Inspect the applicable circuit for an open circuit.
(Refer to the [CIRCUIT INSPECTION] in the workshop manual)

•  Is the circuit normal?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

12

INSPECT SHIELDING CIRCUIT BETWEEN CONNECTIVITY MASTER UNIT (CMU) AND EMERGENCY CALL UNIT

•  Inspect the applicable circuit for continuity with the body ground.
(Refer to the [CIRCUIT INSPECTION] in the workshop manual)

•  Is there continuity?

Yes

Go to the next step.

No

Repair or replace the malfunctioning location and perform the repair completion verification.

13

DETERMINE MALFUNCTIONING LOCATION

•  Clear the DTC recorded in the memory.
(Refer to the [CLEARING DTC] in the workshop manual)

•  Perform the DTC inspection for the connectivity master unit (CMU).
(Refer to the [DTC INSPECTION] in the workshop manual)

•  Are other DTCs displayed that are the same as this DTC?

Yes

Replace the connectivity master unit (CMU) and perform the repair completion verification.

(Refer to the [CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION] in the workshop manual)

No

Replace the emergency call unit and perform the repair completion verification.

(Refer to the [EMERGENCY CALL UNIT REMOVAL/INSTALLATION] in the workshop manual)

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.
(Refer to the [CLEARING DTC] in the workshop manual)

•  Switch the main power ON (READY off or on) and wait for 30 s or more.

•  Perform the DTC inspection for the connectivity master unit (CMU).
(Refer to the [DTC INSPECTION] in the workshop manual)

•  Is the same Pending DTC present?

Yes

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

(Refer to the [CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW] in the workshop manual)

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

•  If the malfunction recurs, replace the connectivity master unit (CMU), then go to the next step.
(Refer to the [CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION] in the workshop manual)

No

Go to the next step.

Repair completion verification 2

VERIFY IF OTHER DTCs ARE DISPLAYED

•  Perform the DTC inspection.
(Refer to the [DTC INSPECTION] in the workshop manual)

•  Are other DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

No

DTC troubleshooting completed.

Step	Inspection	Results	Action
1	VERIFY REPEATABILITY • Switch the main power ON (READY off or on). • Clear the DTC recorded in the memory. (Refer to the [CLEARING DTC] in the workshop manual) • Switch the main power OFF, and then switch it ON (READY off or on) and wait for 30 s or more. • Perform the DTC inspection for the connectivity master unit (CMU). (Refer to the [DTC INSPECTION] in the workshop manual) • Is the same Pending DTC present?	Yes	Go to the next step.
1		No	Go to repair completion verification 2.
2	INSPECT EMERGENCY CALL UNIT FOR MALFUNCTION • Perform the DTC inspection for the emergency call unit. (Refer to the [DTC INSPECTION] in the workshop manual) • Is a DTC displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (Refer to the [DTC TABLE [EMERGENCY CALL UNIT]] in the workshop manual)
2		No	Go to the next step.
3	VERIFY EMERGENCY CALL UNIT POWER SUPPLY VOLTAGE • Measure the voltage at emergency call unit terminal 1AF (vehicle wiring harness side). • Is voltage supplied?	Yes	Go to Step 7.
3		No	Go to the next step.
4	INSPECT EMERGENCY CALL UNIT CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (Refer to the [CONNECTOR INSPECTION] in the workshop manual) • 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.
5	INSPECT EMERGENCY CALL UNIT POWER SUPPLY CIRCUIT FOR SHORT TO GROUND AND OPEN CIRCUIT • Inspect the power supply circuit for a short to ground and open circuit. (Refer to the [CIRCUIT INSPECTION] in the workshop manual) • Is the circuit normal?	Yes	Go to the next step.
5		No	Repair or replace the malfunctioning harness or fuse and perform the repair completion verification.
6	INSPECT EMERGENCY CALL UNIT GROUND CIRCUIT FOR OPEN CIRCUIT • Inspect the applicable circuit for an open circuit. (Refer to the [CIRCUIT INSPECTION] in the workshop manual) • Is the circuit normal?	Yes	Go to Step 8.
6		No	Repair or replace the malfunctioning location and perform the repair completion verification.
7	INSPECT EMERGENCY CALL UNIT CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (Refer to the [CONNECTOR INSPECTION] in the workshop manual) • Are the connector and terminal normal?	Yes	Go to the next step.
7		No	Repair or replace the malfunctioning location and perform the repair completion verification.
8	INSPECT CONNECTIVITY MASTER UNIT (CMU) CONNECTOR FOR MALFUNCTION • Inspect the applicable connector and terminal. (Refer to the [CONNECTOR INSPECTION] in the workshop manual) • Are the connector and terminal normal?	Yes	Go to the next step.
8		No	Repair or replace the malfunctioning location and perform the repair completion verification.
9	INSPECT CIRCUIT BETWEEN CONNECTIVITY MASTER UNIT (CMU) AND EMERGENCY CALL UNIT FOR SHORT TO GROUND • Inspect the applicable circuit for a short to ground. (Refer to the [CIRCUIT INSPECTION] in the workshop manual) • Is the circuit normal?	Yes	Go to the next step.
9		No	Repair or replace the malfunctioning location and perform the repair completion verification.
10	INSPECT CIRCUIT BETWEEN CONNECTIVITY MASTER UNIT (CMU) AND EMERGENCY CALL UNIT FOR SHORT TO POWER SUPPLY • Inspect the applicable circuit for a short to power supply. (Refer to the [CIRCUIT INSPECTION] in the workshop manual) • Is the circuit normal?	Yes	Go to the next step.
10		No	Repair or replace the malfunctioning location and perform the repair completion verification.
11	INSPECT CIRCUIT BETWEEN CONNECTIVITY MASTER UNIT (CMU) AND EMERGENCY CALL UNIT FOR OPEN CIRCUIT • Inspect the applicable circuit for an open circuit. (Refer to the [CIRCUIT INSPECTION] in the workshop manual) • Is the circuit normal?	Yes	Go to the next step.
11		No	Repair or replace the malfunctioning location and perform the repair completion verification.
12	INSPECT SHIELDING CIRCUIT BETWEEN CONNECTIVITY MASTER UNIT (CMU) AND EMERGENCY CALL UNIT • Inspect the applicable circuit for continuity with the body ground. (Refer to the [CIRCUIT INSPECTION] in the workshop manual) • Is there continuity?	Yes	Go to the next step.
12		No	Repair or replace the malfunctioning location and perform the repair completion verification.
13	DETERMINE MALFUNCTIONING LOCATION • Clear the DTC recorded in the memory. (Refer to the [CLEARING DTC] in the workshop manual) • Perform the DTC inspection for the connectivity master unit (CMU). (Refer to the [DTC INSPECTION] in the workshop manual) • Are other DTCs displayed that are the same as this DTC?	Yes	Replace the connectivity master unit (CMU) and perform the repair completion verification. (Refer to the [CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION] in the workshop manual)
13		No	Replace the emergency call unit and perform the repair completion verification. (Refer to the [EMERGENCY CALL UNIT REMOVAL/INSTALLATION] in the workshop manual)
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. (Refer to the [CLEARING DTC] in the workshop manual) • Switch the main power ON (READY off or on) and wait for 30 s or more. • Perform the DTC inspection for the connectivity master unit (CMU). (Refer to the [DTC INSPECTION] in the workshop manual) • Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (Refer to the [CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW] in the workshop manual) If the CAN communication is normal, perform the diagnosis from Step 1. • If the malfunction recurs, replace the connectivity master unit (CMU), then go to the next step. (Refer to the [CONNECTIVITY MASTER UNIT (CMU) REMOVAL/INSTALLATION] in the workshop manual)
Repair completion verification 1		No	Go to the next step.
Repair completion verification 2	VERIFY IF OTHER DTCs ARE DISPLAYED • Perform the DTC inspection. (Refer to the [DTC INSPECTION] in the workshop manual) • Are other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
Repair completion verification 2		No	DTC troubleshooting completed.