Last Modified: 11-20-2023 6.11:8.1.0 Doc ID: RM1000000015ENQ
Model Year Start: 2018 Model: Camry Prod Date Range: [06/2017 - 10/2020]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System): Air Vent Temperature does not Change and Right Vent is Different from Left and Vice Versa (Same Left/Right Temperature Setting); 2018 - 2020 MY Camry [06/2017 - 10/2020]

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

DESCRIPTION

If the temperature of the air that blows from the left and right front registers differs, even though the same temperature is set for both sides, the following suspected areas may be the cause.

Symptom

Factor

Temperature of outlet air is cooler on left or right side (when same temperature set for both sides)
  • Compressor assembly with pulley (compressor solenoid) malfunction*1
  • Cooler compressor assembly (compressor solenoid) malfunction*2
  • Refrigerant volume (low)
  • Mechanical locking of damper and damper link
  • Automatic light control sensor malfunction
  • Harness or connector

Temperature of outlet air is warmer on left or right side (when same temperature set for both sides)
  • Mechanical locking of damper and damper link
  • Blockage in heater radiator unit sub-assembly
  • Harness or connector
  • *1: for A25A-FKS
  • *2: for 2GR-FKS

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • If DTC B1244 is output, troubleshoot for DTC B1244 first.

    Click here 2018 - 2024 MY Camry [03/2017 -        ]; LIGHTING (EXT): LIGHTING SYSTEM: B1244; Light Sensor Circuit

  • Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

PROCEDURE

1.

CHECK WHEN MALFUNCTION OCCURS

Result

Proceed to

When using cooling function

A

When using heater function

B
B

GO TO STEP 6

A

2.

PERFORM REFRIGERANT SHORTAGE CHECK

(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

(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

A/C switch

On

Ambient temperature*

0 to 49°C (32 to 120°F)

Blower speed

HI

*: If the ambient temperature is not within the range shown, do not perform this check.

Result

Amount of Refrigerant

Refrigerant correct

Correct

Refrigerant shortage

Insufficient

OK:

"Refrigerant correct" is displayed on Techstream.

NG

CHARGE SYSTEM WITH REFRIGERANT

for HFC-134a (R134a): Click here 2018 - 2020 MY Camry [06/2017 - 10/2020]; HEATING / AIR CONDITIONING: REFRIGERANT (for HFC-134a(R134a)): REPLACEMENT

for HFO-1234yf (R1234yf): Click here 2018 - 2024 MY Camry [03/2017 -        ]; HEATING / AIR CONDITIONING: REFRIGERANT (for HFO-1234yf(R1234yf)): REPLACEMENT

OK

3.

PERFORM ACTIVE TEST USING TECHSTREAM

(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) Perform the Active Test according to the display on the Techstream.

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*1 or air mix*2) 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*1

Min.: 128

Max.: 383

Operates between 255 to 347 pulses

Air Outlet Servo Pulse (D)

No. 1 air conditioning radiator damper servo sub-assembly (mode) pulse

Min.: 128

Max.: 383

Operates between 241 to 348 pulses

Air Inlet Damper Targ Pulse

No. 1 blower damper servo sub-assembly pulse

Min.: 128

Max.: 383

Operates between 220 to 256 pulses

A/O Servo Pulse(Rr D)

No. 2 air conditioning radiator damper servo sub-assembly pulse*1

Min.: 128

Max.: 383

Operates between 158 to 260 pulses
  • *1: for Dual Type
  • *2: for Single Type

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)

Body Electrical > Air Conditioner > Active Test

Tester Display

Air Outlet Servo Pulse (D)

Body Electrical > Air Conditioner > Active Test

Tester Display

Air Inlet Damper Targ Pulse

Body Electrical > Air Conditioner > Active Test

Tester Display

A/O Servo Pulse(Rr D)

OK:

Each damper servo motor operates.

NG

GO TO DTC TROUBLESHOOTING PROCEDURE FOR MALFUNCTIONING DAMPER SERVO MOTOR 2018 MY Camry [06/2017 - 08/2018]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System): DIAGNOSTIC TROUBLE CODE CHART 2019 - 2020 MY Camry [08/2018 - 10/2020]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System): DIAGNOSTIC TROUBLE CODE CHART

OK

4.

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

(a) Disconnect the M1 automatic light control sensor connector.

(b) Disconnect the K52 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

M1-1 (CLTB) - K52-23 (CLTB)

Always

Below 1 Ω

M1-2 (CLTE) - K52-25 (CLTE)

Always

Below 1 Ω

M1-4 (CLTS) - K52-24 (CLTS)

Always

Below 1 Ω

M1-1 (CLTB) or K52-23 (CLTB) - Other terminals and body ground

Always

10 kΩ or higher

M1-2 (CLTE) or K52-25 (CLTE) - Other terminals and body ground

Always

10 kΩ or higher

M1-4 (CLTS) or K52-24 (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 2018 - 2020 MY Camry [06/2017 - 10/2020]; LIGHTING (EXT): AUTOMATIC LIGHT CONTROL SENSOR: REMOVAL

(b) Inspect the automatic light control sensor.

Click here 2018 - 2024 MY Camry [03/2017 -        ]; LIGHTING (EXT): AUTOMATIC LIGHT CONTROL SENSOR: ON-VEHICLE INSPECTION

OK

INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET

for HFC-134a (R134a): Click here 2018 - 2020 MY Camry [06/2017 - 10/2020]; HEATING / AIR CONDITIONING: REFRIGERANT (for HFC-134a(R134a)): ON-VEHICLE INSPECTION

for HFO-1234yf (R1234yf): Click here 2018 - 2024 MY Camry [03/2017 -        ]; HEATING / AIR CONDITIONING: REFRIGERANT (for HFO-1234yf(R1234yf)): ON-VEHICLE INSPECTION

NG

REPLACE AUTOMATIC LIGHT CONTROL SENSOR

6.

BLEED AIR FROM COOLING SYSTEM

for A25A-FKS: Click here 2018 - 2024 MY Camry [03/2017 -        ]; A25A-FKS (COOLING): COOLANT: REPLACEMENT

for 2GR-FKS: Click here 2018 - 2024 MY Camry [06/2017 -        ]; 2GR-FKS (COOLING): COOLANT: REPLACEMENT

NEXT

7.

CHECK OPERATION (AIR CONDITIONING SYSTEM)

(a) Set the same temperature for the left and right sides and check that the air that blows from the left and right front registers is the same temperature.

OK:

The air from the left and right front registers is the same temperature.

OK

END (MALFUNCTION DUE TO AIR IN COOLING SYSTEM)
NG

8.

PERFORM ACTIVE TEST USING TECHSTREAM

(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) Perform the Active Test according to the display on the Techstream.

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*1 or air mix*2) 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*1

Min.: 128

Max.: 383

Operates between 255 to 347 pulses

Air Outlet Servo Pulse (D)

No. 1 air conditioning radiator damper servo sub-assembly (mode) pulse

Min.: 128

Max.: 383

Operates between 241 to 348 pulses

Air Inlet Damper Targ Pulse

No. 1 blower damper servo sub-assembly pulse

Min.: 128

Max.: 383

Operates between 220 to 256 pulses

A/O Servo Pulse(Rr D)

No. 2 air conditioning radiator damper servo sub-assembly pulse*1

Min.: 128

Max.: 383

Operates between 158 to 260 pulses
  • *1: for Dual Type
  • *2: for Single Type

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)

Body Electrical > Air Conditioner > Active Test

Tester Display

Air Outlet Servo Pulse (D)

Body Electrical > Air Conditioner > Active Test

Tester Display

Air Inlet Damper Targ Pulse

Body Electrical > Air Conditioner > Active Test

Tester Display

A/O Servo Pulse(Rr D)

OK:

Each damper servo motor operates.

OK

REPLACE HEATER RADIATOR UNIT SUB-ASSEMBLY

NG

GO TO DTC TROUBLESHOOTING PROCEDURE FOR MALFUNCTIONING DAMPER SERVO MOTOR 2018 MY Camry [06/2017 - 08/2018]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System): DIAGNOSTIC TROUBLE CODE CHART 2019 - 2020 MY Camry [08/2018 - 10/2020]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System): DIAGNOSTIC TROUBLE CODE CHART