Toyota Tundra. Manual — part 2408

2. INSPECT FUSE (HTR)

a. Remove the HTR H-fuse from the engine room relay block.

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

NG: REPLACE FUSE

OK: Go to Next Step

3. CHECK HARNESS AND CONNECTOR (BLOWER MOTOR - BATTERY AND BODY

GROUND)

a. Disconnect the J32 blower motor connector.

Fig. 68: Identifying Terminals Of J32 Blower Motor Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Standard Voltage

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection Condition Specified Condition

HTR H-fuse

Always

Below 1 ohms

Tester Connection

Condition Specified Condition

J32-1 (GND) - Body ground Always

Below 1 ohms

Tester Connection

Condition Specified Condition

J32-3 (+B) - Body ground Always

11 to 14 V

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

4. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BLOWER

MOTOR)

a. Disconnect the J19 air conditioning amplifier connector.

Fig. 69: Identifying Terminals Of J19 Air Conditioning Amplifier Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

b. Disconnect the J32 blower motor connector.

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection

Condition Specified Condition

J19-23 (BLW) - J32-2 (S1)

Always

Below 1 ohms

J19-23 (BLW) or J32-2 (S1) - Body ground Always

10 kohms or higher

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

5. CHECK BLOWER MOTOR (S1 VOLTAGE)

a. Disconnect the J19 air conditioning amplifier connector.

b. Reconnect the J32 blower motor connector.

Fig. 70: Identifying Terminals Of J32 Blower Motor Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

Standard Voltage

TESTER CONNECTION SPECIFIED CONDITION CHART

NG: REPLACE BLOWER MOTOR (See REMOVAL )

OK: Go to Next Step

6. CHECK AIR CONDITIONING AMPLIFIER (BLW VOLTAGE)

a. Remove the air conditioning amplifier with its connectors still connected (see REMOVAL ).

b. Turn the ignition switch ON.

c. Turn the blower switch LO.

d. Using an oscilloscope, check the waveform.

Standard

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection

Condition

Specified Condition

J19-23 (BLW) -Body ground Ignition switch ON

4.5 to 5.5 V

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra

Fig. 71: Identifying Terminals Of J19 Air Conditioning Amplifier Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

HINT:

Waveform varies with the blower level.

NG: REPLACE AIR CONDITIONING AMPLIFIER (See REMOVAL )

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

AIR CONDITIONING COMPRESSOR MAGNETIC CLUTCH CIRCUIT

DESCRIPTION

When the air conditioning amplifier is turned on, a magnetic clutch ON signal is sent from the MGC terminal of
the air conditioning amplifier. Then, the magnetic clutch relay (MG CLT) turns on to operate the magnetic

Tester Connection

Tool Setting

Condition

Specified Condition

J19-23 (BLW) - J19-14 (GND) 1 V/DIV., 500 µsec./DIV.

Ignition switch ON
Blower switch LO

Pulse generation

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra