DTC U0424:86 [TELEMATICS COMMUNICATION UNIT (TYPE-B)]

id1602a7017000

Outline

System malfunction location

Error signal received from front climate control unit/climate control unit

Detection condition

•  The telematics communication unit received the invalid signal from the front climate control unit/climate control unit for 5 s or more.

Fail-safe

Not applicable

Possible cause

•  DTCs are stored in the front climate control unit/climate control unit.

•  Malfunction in CAN communication line between the front climate control unit/climate control unit and telematics communication unit

•  Front climate control unit/climate control unit malfunction

•  Telematics communication unit malfunction

System wiring diagram

Not applicable

Connector diagram

Not applicable

System malfunction location	Error signal received from front climate control unit/climate control unit
Detection condition	• The telematics communication unit received the invalid signal from the front climate control unit/climate control unit for 5 s or more.
Fail-safe	Not applicable
Possible cause	• DTCs are stored in the front climate control unit/climate control unit. • Malfunction in CAN communication line between the front climate control unit/climate control unit and telematics communication unit • Front climate control unit/climate control unit malfunction • Telematics communication unit malfunction
System wiring diagram	Not applicable
Connector diagram	Not applicable

Diagnostic Procedure

Step

Inspection

Results

Action

1

INSPECT FRONT CLIMATE CONTROL UNIT/CLIMATE CONTROL UNIT FOR MALFUNCTION

•  Perform the DTC inspection for the front climate control unit/climate control unit.
(Refer to the [DTC INSPECTION] in the workshop manual)

•  Are any DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(Refer to the [DTC TABLE [CLIMATE CONTROL UNIT]] in the workshop manual)

No

Go to the next step.

2

INSPECT FRONT CLIMATE CONTROL UNIT/CLIMATE CONTROL UNIT FOR MALFUNCTION DEPENDING ON REPEATABILITY

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

•  Switch the ignition ON (engine off or on) and wait for 5 s or more.

•  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 front climate control unit/climate control unit and perform the repair completion verification.

(Refer to the [CLIMATE CONTROL UNIT REMOVAL/INSTALLATION] in the workshop manual)

(Refer to the [FRONT CLIMATE CONTROL UNIT REMOVAL/INSTALLATION] in the workshop manual)

No

Go to repair completion verification 2.

Repair completion verification 1

VERIFY THAT VEHICLE IS REPAIRED

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

•  Switch the ignition ON (engine off or on) and wait for 5 s or more.

•  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 FRONT CLIMATE CONTROL UNIT/CLIMATE CONTROL UNIT FOR MALFUNCTION • Perform the DTC inspection for the front climate control unit/climate control unit. (Refer to the [DTC INSPECTION] in the workshop manual) • Are any DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (Refer to the [DTC TABLE [CLIMATE CONTROL UNIT]] in the workshop manual)
1		No	Go to the next step.
2	INSPECT FRONT CLIMATE CONTROL UNIT/CLIMATE CONTROL UNIT FOR MALFUNCTION DEPENDING ON REPEATABILITY • Clear the DTC recorded in the memory. (Refer to the [CLEARING DTC] in the workshop manual) • Switch the ignition ON (engine off or on) and wait for 5 s or more. • 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 front climate control unit/climate control unit and perform the repair completion verification. (Refer to the [CLIMATE CONTROL UNIT REMOVAL/INSTALLATION] in the workshop manual) (Refer to the [FRONT CLIMATE CONTROL UNIT REMOVAL/INSTALLATION] in the workshop manual)
2		No	Go to repair completion verification 2.
Repair completion verification 1	VERIFY THAT VEHICLE IS REPAIRED • Clear the DTC recorded in the memory. (Refer to the [CLEARING DTC] in the workshop manual) • Switch the ignition ON (engine off or on) and wait for 5 s or more. • 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.