Toyota Tundra. Manual — part 2402

RESULT REFERENCE

B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM
SYMPTOMS TABLE (See PROBLEM SYMPTOMS TABLE )

C: REPLACE AIR CONDITIONING AMPLIFIER (See REMOVAL )

A: REPLACE AIR CONDITIONING PRESSURE SWITCH (See REMOVAL )

DTC B1424/24 SOLAR SENSOR CIRCUIT (DRIVER SIDE)

DESCRIPTION

The solar sensor, which is installed on the upper side of the instrument panel, detects sunlight and controls the
air conditioning in AUTO mode. The output current from the solar sensor varies according to the amount of
sunlight. When the sunlight increases, the output current increases. As the sunlight decreases, the output current
decreases. The air conditioning amplifier detects output current from the solar sensor.

Fig. 52: Solar Sensor Output Voltage Graph
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

DTC DETECTION CONDITION CHART

Result

Proceed to

NG

A

OK (Checking from the PROBLEM SYMPTOMS TABLE)

B

OK (Checking from the DTC)

C

DTC

DTC Detection Condition

Trouble Area



Automatic light control
sensor (solar sensor)



Harness and connector
between solar sensor and air

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra

WIRING DIAGRAM

Fig. 53: Solar Sensor - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

HINT:

If DTC B1244 is output at the same time, troubleshoot DTC B1244 first (see DTC B1244 LIGHT SENSOR
CIRCUIT MALFUNCTION ).

1. READ VALUE USING TECHSTREAM (SOLAR SENSOR (for Driver Side))

a. Use the Data List to check if the driver side solar sensor is functioning properly.

Air Conditioner

DATA LIST

B1424/24

Open or short in driver side solar
sensor circuit

conditioning amplifier
Harness and connector
between solar sensor and
main body ECU



Main body ECU



Air conditioning amplifier

Tester Display

Measurement

Item/Range

Normal Condition

Diagnostic

Note

Solar Sensor

Driver side solar
sensor/Min.: 0

Driver side solar sensor voltage

Open in circuit:
0

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra

OK:

The display is as specified in the normal condition.

Result

RESULT REFERENCE

B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE (See PROBLEM SYMPTOMS TABLE )

C: REPLACE AIR CONDITIONING AMPLIFIER (See REMOVAL )

A: Go to Next Step

2. CHECK HARNESS AND CONNECTOR (SOLAR SENSOR)

a. Disconnect the K19 solar sensor connector.

Fig. 54: Identifying Terminals Of K19 Solar Sensor Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

(D Side)

Max.: 255

increases as brightness increases

Short in circuit:
255

Result

Proceed to

NG

A

OK (Checking from the PROBLEM SYMPTOMS TABLE)

B

OK (Checking from the DTC)

C

Tester Connection

Condition Specified Condition

K19-3 (CLTE) -Body ground Always

Below 1 ohms

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra

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

Standard Voltage

TESTER CONNECTION SPECIFIED CONDITION CHART

NG: Go to step 5

OK: Go to Next Step

3. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - SOLAR

SENSOR)

a. Disconnect the J19 air conditioning amplifier connector.

b. Disconnect the K19 solar sensor connector.

Fig. 55: Identifying Terminals Of K19 Solar Sensor Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Tester Connection

Switch Condition Specified Condition

K19-6 (CLTB) - K19-3 (CLTE)

Ignition switch ON

11 to 14 V

Ignition switch OFF

Below 1 V

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra