Toyota Camry (XV70): Indicator does not Illuminate

Toyota Camry Repair Manual XV70 (2018-2024) / Vehicle Interior / Heating / Air Conditioning / Air Conditioning System (for Manual Air Conditioning System) / Indicator does not Illuminate

DESCRIPTION

If none of the switch indicators on the air conditioning control assembly illuminate, the following suspected areas may be the cause.

Symptom	Factor
None of the switch indicators on the air conditioning control assembly illuminate	Air conditioning amplifier assembly malfunction Air conditioning control assembly malfunction A/C switch malfunction A/C switch indicator malfunction (including when indicator turned off without switch operation) Servo motor initialization (incomplete) Mechanical locking of damper and damper link Refrigerant pressure is extremely low Low detected ambient temperature (including thermistor assembly malfunction)

Symptom

Factor

None of the switch indicators on the air conditioning control assembly illuminate

Air conditioning amplifier assembly malfunction
Air conditioning control assembly malfunction
A/C switch malfunction
A/C switch indicator malfunction (including when indicator turned off without switch operation)
Servo motor initialization (incomplete)
Mechanical locking of damper and damper link
Refrigerant pressure is extremely low
Low detected ambient temperature (including thermistor assembly malfunction)

PROCEDURE

1.	CHECK AIR CONDITIONING CONTROL ASSEMBLY

(a) Check that the switch indicators on the air conditioning control assembly illuminate immediately after the engine is started.

OK:

All switch indicators illuminate.

REPLACE AIR CONDITIONING CONTROL ASSEMBLY

2.	READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Body Electrical / Air Conditioner / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Air Conditioner > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
Ambient Temp Sensor	Thermistor assembly	Min.: -23.30°C (-9.94°F) Max.: 65.95°C (150.71°F)	Actual ambient temperature displayed	-

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Ambient Temp Sensor

Thermistor assembly

Min.: -23.30°C (-9.94°F)

Max.: 65.95°C (150.71°F)

Actual ambient temperature displayed

Body Electrical > Air Conditioner > Data List

Tester Display
Ambient Temp Sensor

OK:

The value displayed is 0°C (32°F) or higher.

INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET

GO TO OTHER DIAGNOSIS PROCEDURE (Ambient Temperature Display System)

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