B1531

DTC B1531: Air Intake Control Actuator and/or Its Circuit Malfunction

Wiring Diagram










DTC Detecting Condition and Trouble Area






DTC Confirmation Procedure

1) Connect scan tool to DLC with ignition switch turned OFF.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Start A/C system and select air intake selector at "FRE" position.
4) Select air intake selector at "REC" position and wait for 1 min. or more.
5) Check DTC.

DTC Troubleshooting

1. Visual check

Check if there is any obstruction in operating range of actuator linkage and if actuator linkage operates smoothly.

Is it in good condition?
YES -
Go to Step 2.
NO -
Obstruction in operating range of actuator linkage, actuator linkage faulty and/or internal fault of HVAC unit.

2. Wire harness check

Disconnect connector from air intake control actuator with ignition switch turned OFF.
Check for proper connection to temperature control actuator connector at "ORN" and "GRN" wire terminals.
If OK, measure voltage between "ORN" wire terminal of temperature control actuator connector and vehicle body ground with ignition switch turned ON.

Is voltage 10 - 14 V?
YES -
Go to Step 6.
NO -
Go to Step 3.

3. Wire harness check

Disconnect connector from HVAC control module with ignition switch turned OFF.
Check for proper connection to HVAC control module connector at "G52-9" and "G52-10" terminals.
If OK, measure resistance between "ORN" wire terminal of air intake control actuator connector and "G52-9" terminal of HVAC control module connector.

Is resistance below 5 ohms?
YES -
Go to Step 4.
NO -
"ORN" wire open or high resistance circuit.

4. Wire harness check

Measure resistance between "ORN" wire terminal of air intake control actuator connector and vehicle body ground.

Is resistance infinity?
YES -
Go to Step 5.
NO -
"ORN" wire shorted to ground circuit.

5. Wire harness check

Measure voltage between "ORN" wire terminal of air intake control actuator connector and vehicle body ground with ignition switch turned ON.

Is voltage 0 V?
YES -
Go to Step 6.
NO -
"ORN" wire shorted to other circuit.

6. Wire harness check

Connect connector to HVAC control module with ignition switch turned OFF.
Measure voltage between "GRN" wire terminal of air intake control actuator connector and vehicle body ground with ignition switch turned ON.

Is voltage 10 - 14 V?
YES -
Go to Step 10.
NO -
Go to Step 7.

7. Wire harness check

Disconnect connector from HVAC control module with ignition switch turned OFF.
Check for proper connection to HVAC control module connector at "G52-9" and "G52-10" terminals.
If OK, measure resistance between "GRN" wire terminal of air intake control actuator connector and "G52-10" terminal of HVAC control module connector.

Is resistance below 5 ohms?
YES -
Go to Step 8.
NO -
"GRN" wire open or high resistance circuit.

8. Wire harness check

Measure resistance between "GRN" wire terminal of air intake control actuator connector and vehicle body ground.

Is resistance infinity?
YES -
Go to Step 9.
NO -
"GRN" wire shorted to ground circuit.

9. Wire harness check

Measure voltage between "GRN" wire terminal of air intake control actuator connector and vehicle body ground with ignition switch turned ON.

Is voltage 0 V?
YES -
Go to Step 10.
NO -
"GRN" wire shorted to other circuit.

10. Position sensor circuit check

Check air intake control actuator position sensor circuit referring to Step 1 to Step 6 and Step 11 to Step 12 of B1530 DTC B1530-H/L: Air Intake Control Actuator (Position Sensor) and/or Its Circuit Malfunction.

Is it in good condition?
YES -
Go to Step 11.
NO -
Repair circuit.

11. Air intake control actuator check

Check intake air control actuator referring to Inspection Air Intake Control Actuator Inspection.

Is it in good condition?
YES -
HVAC control module faulty.
NO -
Air intake control actuator faulty.