DTC B1081:71 [DASH-ELECTRICAL SUPPLY UNIT]

id0702k8702800

Outline

System malfunction location

Air mix actuator motor lock

Detection condition

•  The dash-electrical supply unit detects that the air mix actuator remains operating clockwise or counterclockwise and does not stop for 12 s or more.

Fail-safe

•  Air mix actuator drive signal is stopped right when the malfunction is determined.

Possible cause

•  Air mix actuator malfunction

•  A/C unit malfunction

―  Air mix link malfunction

―  Air mix door malfunction

•  Dash-electrical supply unit malfunction

System wiring diagram

Not applicable

Connector diagram

Not applicable

System malfunction location	Air mix actuator motor lock
Detection condition	• The dash-electrical supply unit detects that the air mix actuator remains operating clockwise or counterclockwise and does not stop for 12 s or more.
Fail-safe	• Air mix actuator drive signal is stopped right when the malfunction is determined.
Possible cause	• Air mix actuator malfunction • A/C unit malfunction ― Air mix link malfunction ― Air mix door malfunction • Dash-electrical supply unit malfunction
System wiring diagram	Not applicable
Connector diagram	Not applicable

Diagnostic Procedure

Step

Inspection

Results

Action

1

VERIFY OTHER DTCs RELATED TO AIR MIX ACTUATOR INTERNAL POTENTIOMETER CIRCUIT

•  Perform the DTC inspection for the dash-electrical supply unit.
(See DTC INSPECTION.)

•  Are other DTCs related to the air mix actuator internal potentiometer circuit displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

(See DTC TABLE [DASH-ELECTRICAL SUPPLY UNIT].)

No

Go to the next step.

2

INSPECT AIR MIX ACTUATOR FOR MALFUNCTION

•  Perform the actuator inspection.
(See AIR MIX ACTUATOR INSPECTION [FULL-AUTO AIR CONDITIONER].)

•  Is the part normal?

Yes

Go to the next step.

No

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

(See AIR MIX ACTUATOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)

3

INSPECT AIR MIX LINK OPERATION

•  Operate the air mix link manually.

•  Does the air mix link operate smoothly?

Yes

Go to the next step.

No

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

(See A/C UNIT REMOVAL/INSTALLATION.)

(See A/C UNIT DISASSEMBLY/ASSEMBLY.)

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 main power ON (READY off or on) and wait for 8 s or more.

•  Perform the DTC inspection for the dash-electrical supply 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 [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 recurs, replace the dash-electrical supply unit, then go to the next step.
(See DASH-ELECTRICAL SUPPLY UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)

No

Go to the next step.

Repair completion verification 2

VERIFY IF OTHER DTCs DISPLAYED

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

•  Are any DTCs displayed?

Yes

Repair the malfunctioning location according to the applicable DTC troubleshooting.

No

DTC troubleshooting completed.

Step	Inspection	Results	Action
1	VERIFY OTHER DTCs RELATED TO AIR MIX ACTUATOR INTERNAL POTENTIOMETER CIRCUIT • Perform the DTC inspection for the dash-electrical supply unit. (See DTC INSPECTION.) • Are other DTCs related to the air mix actuator internal potentiometer circuit displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [DASH-ELECTRICAL SUPPLY UNIT].)
1		No	Go to the next step.
2	INSPECT AIR MIX ACTUATOR FOR MALFUNCTION • Perform the actuator inspection. (See AIR MIX ACTUATOR INSPECTION [FULL-AUTO AIR CONDITIONER].) • Is the part normal?	Yes	Go to the next step.
2		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See AIR MIX ACTUATOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
3	INSPECT AIR MIX LINK OPERATION • Operate the air mix link manually. • Does the air mix link operate smoothly?	Yes	Go to the next step.
3		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See A/C UNIT REMOVAL/INSTALLATION.) (See A/C UNIT DISASSEMBLY/ASSEMBLY.)
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 main power ON (READY off or on) and wait for 8 s or more. • Perform the DTC inspection for the dash-electrical supply 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 [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 recurs, replace the dash-electrical supply unit, then go to the next step. (See DASH-ELECTRICAL SUPPLY UNIT REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
Repair completion verification 1		No	Go to the next step.
Repair completion verification 2	VERIFY IF OTHER DTCs DISPLAYED • Perform the DTC inspection. (See DTC INSPECTION.) • Are any DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
Repair completion verification 2		No	DTC troubleshooting completed.