Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001H97U
Model Year Start: 2020 Model: Corolla Prod Date Range: [01/2019 - 09/2022]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): Operation not Accepted Even If Air Conditioning Switch is Operated; 2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]

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) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Air Conditioner / Trouble Codes.

(e) Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes

Result

Proceed to

B14B2 is not output

A

B14B2 is output

B
B

GO TO DTC B14B2

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

Condition

Specified Condition

I49-5 (B) - Body ground

Power switch off

11 to 14 V

I49-6 (IG+) - Body ground

Power switch on (IG)

11 to 14 V

Power 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