Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Operation not Accepted Even If Air Conditioning Switch is Operated

Toyota Corolla Cross (2022-2025) Service Manual / Vehicle Interior / Heating / Air Conditioning / Air Conditioning System (for Hev Model) / Operation not Accepted Even If Air Conditioning Switch is Operated

DESCRIPTION

If the air conditioning system cannot be operated using the air conditioning control assembly, the following factors may be the cause.

Symptom

Factor

Air conditioning system cannot be operated using air conditioning control assembly

  • (With the exception of the switch indicators, no inputs are reflected when other switches operated)
  • LIN communication malfunction between air conditioning amplifier assembly and air conditioning control assembly
  • Short to +B or ground in air conditioning amplifier assembly circuit
  • Air conditioning amplifier assembly malfunction
  • Air conditioning control assembly malfunction
  • Harness or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.

CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes

Result

Proceed to

B14B287 is not output

A

B14B287 is output

B
B

GO TO DTC B14B287

A

2.

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - POWER SOURCE AND BODY GROUND)

*a

Front view of wire harness connector

(to Air Conditioning Amplifier Assembly)

(a) Disconnect the I49 air conditioning amplifier assembly connector.

(b) Measure the voltage and resistance according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

I49-5 (B) - Body ground

Ignition switch off

11 to 14 V

I49-6 (IG+) - Body ground

Ignition switch ON

11 to 14 V

Ignition switch off

Below 1 V

Standard Resistance:

Tester Connection

Condition

Specified Condition

I49-17 (GND) - Body ground

Always

Below 1 Ω
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

    READ NEXT:

     Front Window Fogging

    DESCRIPTION If the windshield frequently fogs up even though the air conditioning system is operating, the following factors may be the cause. Symptom Factor Windshield frequently fogs

     Blower Motor does not Operate

    DESCRIPTION If air does not flow from the front registers after the blower switch on the air conditioning control assembly is operated, the following factors may be the cause. Symptom Factor

     Weak Blower Output

    DESCRIPTION If the airflow from the front registers is weak regardless of the blower speed setting displayed on the air conditioning control assembly, the following factors may be the cause. Sym

    SEE MORE:

     Lost Communication with Cruise Control Front Distance Range Sensor Single Sensor or Center Missing Message (U023587)

    DESCRIPTION The forward recognition camera communicates with the millimeter wave radar sensor assembly via CAN communication line. If communication with the millimeter wave radar sensor assembly stops, the forward recognition camera stores DTC U023587. DTC No. Detection

     On-vehicle Inspection

    ON-VEHICLE INSPECTION CAUTION / NOTICE / HINT CAUTION: To prevent injury due to contact with an operating V-ribbed belt or cooling fan, keep your hands and clothing away from the V-ribbed belt and cooling fans when working in the engine compartment with the engine running or the ignition

    © 2020-2025 Copyright www.tcorollacross.com PT NL