Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001QM7S
Model Year Start: 2021 Model: RAV4 Prod Date Range: [08/2020 - 12/2021]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model): Air Vent Temperature does not Change and Right Vent is Different from Left and Vice Versa (Same Left/Right Temperature Setting); 2021 MY RAV4 [08/2020 - 12/2021]

Air Vent Temperature does not Change and Right Vent is Different from Left and Vice Versa (Same Left/Right Temperature Setting)

DESCRIPTION

If there is a difference in temperature between the left and right air outlets while dual mode is ON, the following causes are possible.

Malfunction Status

Factor

There is a difference in temperature between the left and right air outlets (while cooling operation)
  • Compressor with pulley assembly malfunction
  • Lack of refrigerant gas
  • Air mix damper and link operation (jamming)
  • Automatic light control sensor malfunction

There is a difference in temperature between the left and right air outlets (while heater operation)
  • Air mix damper and link operation (jamming)
  • Heater core closed waterway

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • If DTC B1244 is output, troubleshoot for DTC B1244 first.
    • w/ Headlight ECU: 2019 - 2021 MY RAV4 RAV4 HV [11/2018 - 12/2021]; LIGHTING (EXT): LIGHTING SYSTEM (w/ Headlight ECU without AFS): B1244; Light Sensor Circuit
    • w/o Headlight ECU: 2019 - 2021 MY RAV4 RAV4 HV [11/2018 - 12/2021]; LIGHTING (EXT): LIGHTING SYSTEM (w/o Headlight ECU): B1244; Light Sensor Circuit
  • Before replacing the main body ECU (multiplex network body ECU), refer to Registraion.

    Click here 2021 MY RAV4 [08/2020 - 12/2021]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION

PROCEDURE

1.

CHECK MALFUNCTION STATUS

Result

Proceed to

While cooling

A

While heater

B
B

GO TO STEP 6

A

2.

CHECK REFRIGERANT SHORTAGE

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Air Conditioner / Utility / Refrigerant Gas Volume Check.

Body Electrical > Air Conditioner > Utility

Tester Display

Refrigerant Gas Volume Check

OK:

"Refrigerant correct" is displayed on Techstream.

(e) Check that the following conditions are met and perform the refrigerant shortage check according to the display on the Techstream.

Measurement Condition:

Item

Condition

Vehicle Condition

Engine running

A/C Switch

On

Ambient Temperature*1

0 to 49°C (32 to 120°F)

Air Conditioning Air Inlet Temperature*2

25 to 35°C (77 to 95°F)

Set Temperature

MAX COLD

Recirculation/fresh Control Switch

Recirculation

Air Vent Damper Position

FACE

Blower Speed

HI

HINT:

  • Refer to the Techstream operator's manual for further details.
  • A message indicating a refrigerant shortage is displayed on the Techstream and the air conditioning system turns off if the amount of refrigerant in the system is insufficient.
  • DTCs are not stored when performing the refrigerant shortage check using the Techstream.
  • *1: This inspection can be judged correctly only if the ambient temperature is within a range of 0 to 49°C (32 to 120°F). Therefore, postpone the test if the temperature is low.
  • *2: This inspection can be judged correctly only if the air inlet temperature is within a range of 25 to 35°C (77 to 95°F). Therefore, postpone the test if the temperature is out of range.

Result

Amount of Refrigerant

Refrigerant shortage

Insufficient or leakage

Refrigerant correct

Correct

OK:

"Refrigerant correct" is displayed on the Techstream.

NG

CHARGE SYSTEM WITH REFRIGERANT

OK

3.

PERFORM ACTIVE TEST USING TECHSTREAM (SERVO PULSE)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Air Conditioner / Active Test.

(e) Check the operation by referring to the table below.

Body Electrical > Air Conditioner > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Air Mix Servo Targ Pulse(D)

No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix) pulse

Min.: 128

Max.: 383

Operates between 165 to 257 pulses

Air Mix Servo Targ Pulse(P)

No. 1 air conditioning radiator damper servo sub-assembly (front passenger side air mix) pulse

Min.: 128

Max.: 383

Operates between 255 to 347 pulses

Body Electrical > Air Conditioner > Active Test

Tester Display

Air Mix Servo Targ Pulse(D)

Body Electrical > Air Conditioner > Active Test

Tester Display

Air Mix Servo Targ Pulse(P)

OK:

Damper servo motor is operated.

NG

GO TO DTC OF APPLICABLE SERVO MOTOR OPERATING ABNORMALLY

OK

4.

CHECK HARNESS AND CONNECTOR (AUTOMATIC LIGHT CONTROL SENSOR - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

(a) Disconnect the H1 automatic light control sensor connector.

(b) Disconnect the G44 main body ECU (multiplex network body ECU) connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

H1-1 (CLTB) - G44-23 (CLTB)

Always

Below 1 Ω

H1-2 (CLTE) - G44-25 (CLTE)

Always

Below 1 Ω

H1-4 (CLTS) - G44-24 (CLTS)

Always

Below 1 Ω

H1-1 (CLTB) or G44-23 (CLTB) - Other terminals and body ground

Always

10 kΩ or higher

H1-2 (CLTE) or G44-25 (CLTE) - Other terminals and body ground

Always

10 kΩ or higher

H1-4 (CLTS) or G44-24 (CLTS) - Other terminals and body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

INSPECT AUTOMATIC LIGHT CONTROL SENSOR

(a) Remove the automatic light control sensor.

Click here 2021 MY RAV4 RAV4 HV [08/2020 - 12/2021]; LIGHTING (EXT): AUTOMATIC LIGHT CONTROL SENSOR: REMOVAL

(b) Inspect the automatic light control sensor.

Click here 2019 - 2024 MY RAV4 RAV4 HV [11/2018 -        ]; LIGHTING (EXT): AUTOMATIC LIGHT CONTROL SENSOR: ON-VEHICLE INSPECTION

OK

GO TO ON-VEHICLE INSPECTION

NG

REPLACE AUTOMATIC LIGHT CONTROL SENSOR

6.

BLEED AIR FROM COOLANT

Click here 2019 - 2024 MY RAV4 HV [11/2018 -        ]; A25A-FXS (COOLING): COOLANT: REPLACEMENT

NEXT

7.

CHECK OPERATION (AIR CONDITIONING SYSTEM)

(a) Check that there is not a difference in temperature between the left and right air outlets.

OK:

There is not a difference in temperature between the left and right air outlets.

OK

END (FAILURE DUE TO AIR ENTERING COOLANT)
NG

8.

PERFORM ACTIVE TEST USING TECHSTREAM (SERVO PULSE)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Air Conditioner / Active Test.

(e) Check the operation by referring to the table below.

Body Electrical > Air Conditioner > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Air Mix Servo Targ Pulse(D)

No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix) pulse

Min.: 128

Max.: 383

Operates between 165 to 257 pulses

Air Mix Servo Targ Pulse(P)

No. 1 air conditioning radiator damper servo sub-assembly (front passenger side air mix) pulse

Min.: 128

Max.: 383

Operates between 255 to 347 pulses

Body Electrical > Air Conditioner > Active Test

Tester Display

Air Mix Servo Targ Pulse(D)

Body Electrical > Air Conditioner > Active Test

Tester Display

Air Mix Servo Targ Pulse(P)

OK:

Damper servo motor is operated.

OK

REPLACE HEATER RADIATOR UNIT SUB-ASSEMBLY

NG

GO TO DIAGNOSTIC TROUBLE CODE CHART (FOR SERVO MOTOR OF APPLICABLE ABNORMAL OPERATION)