DTC U2050:55 [TELEMATICS COMMUNICATION UNIT (TYPE-B)]

id1602a7018000

Outline

System malfunction location

Unprogrammed remote service encryption key

Detection condition

•  The telematics communication unit detects that the remote service encryption key for the telematics communication unit is unprogrammed.

Fail-safe

Not applicable

Possible cause

•  DTCs are stored in the start stop unit.

•  Inappropriate telematics communication unit replacement procedure

•  Start stop unit malfunction

•  Telematics communication unit malfunction

System wiring diagram

Not applicable

Connector diagram

Not applicable

System malfunction location	Unprogrammed remote service encryption key
Detection condition	• The telematics communication unit detects that the remote service encryption key for the telematics communication unit is unprogrammed.
Fail-safe	Not applicable
Possible cause	• DTCs are stored in the start stop unit. • Inappropriate telematics communication unit replacement procedure • Start stop unit malfunction • Telematics communication unit malfunction
System wiring diagram	Not applicable
Connector diagram	Not applicable

Diagnostic Procedure

Step

Inspection

Results

Action

1

INSPECT START STOP UNIT FOR MALFUNCTION

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

•  Is a DTC related to start stop unit communication error or internal malfunction displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(Refer to the [DTC TABLE [START STOP UNIT]] in the workshop manual)

No

Go to the next step.

2

VERIFY TELEMATICS COMMUNICATION UNIT REPLACEMENT RECORD

•  Verify if the telematics communication unit has been replaced before performing this troubleshooting procedure.

•  Has the telematics communication unit been replaced?

Yes

After implementing the required servicing according to procedure when replacing a module, perform the repair completion verification.

(Refer to the [TELEMATICS COMMUNICATION UNIT REMOVAL/INSTALLATION] in the workshop manual)

No

Go to the next step.

3

INSPECT START STOP UNIT FOR MALFUNCTION DEPENDING ON REPEATABILITY

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

•  Perform the DTC inspection for the telematics communication unit.
(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, replace the start stop unit and perform the repair completion verification.

(Refer to the [START STOP UNIT REMOVAL/INSTALLATION] in the workshop manual)

No

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

•  Perform the DTC inspection for the telematics communication unit.
(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 telematics communication unit, then go to the next step.
(Refer to the [TELEMATICS COMMUNICATION UNIT REMOVAL/INSTALLATION] in the workshop manual)

No

Go to the next step.

Repair completion verification 2

VERIFY IF OTHER DTC IS DISPLAYED

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

•  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 START STOP UNIT FOR MALFUNCTION • Perform the DTC inspection for the start stop unit. (Refer to the [DTC INSPECTION] in the workshop manual) • Is a DTC related to start stop unit communication error or internal malfunction displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (Refer to the [DTC TABLE [START STOP UNIT]] in the workshop manual)
1		No	Go to the next step.
2	VERIFY TELEMATICS COMMUNICATION UNIT REPLACEMENT RECORD • Verify if the telematics communication unit has been replaced before performing this troubleshooting procedure. • Has the telematics communication unit been replaced?	Yes	After implementing the required servicing according to procedure when replacing a module, perform the repair completion verification. (Refer to the [TELEMATICS COMMUNICATION UNIT REMOVAL/INSTALLATION] in the workshop manual)
2		No	Go to the next step.
3	INSPECT START STOP UNIT FOR MALFUNCTION DEPENDING ON REPEATABILITY • Clear the DTC recorded in the memory. (Refer to the [CLEARING DTC] in the workshop manual) • Perform the DTC inspection for the telematics communication unit. (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, replace the start stop unit and perform the repair completion verification. (Refer to the [START STOP UNIT REMOVAL/INSTALLATION] in the workshop manual)
3		No	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. (Refer to the [CLEARING DTC] in the workshop manual) • Perform the DTC inspection for the telematics communication unit. (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 telematics communication unit, then go to the next step. (Refer to the [TELEMATICS COMMUNICATION UNIT REMOVAL/INSTALLATION] in the workshop manual)
Repair completion verification 1		No	Go to the next step.
Repair completion verification 2	VERIFY IF OTHER DTC IS DISPLAYED • Perform the DTC inspection. (Refer to the [DTC INSPECTION] in the workshop manual) • Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
Repair completion verification 2		No	DTC troubleshooting completed.