Toyota Tundra. Manual — part 2427

a. Repair or replace the air conditioning harness.

4. CHECK FOR DTC

a. Clear the DTC (see DTC CHECK/CLEAR ).

b. Check for DTC (see DTC CHECK/CLEAR ).

OK:

DTC is not output.

NG: REPLACE AIR CONDITIONING AMPLIFIER (See REMOVAL )

OK: END

DTC B1499/99 MULTIPLEX COMMUNICATION CIRCUIT

DESCRIPTION

This DTC outputs when CAN communication error is occurred.

DTC DETECTION CONDITION CHART

INSPECTION PROCEDURE

1. CHECK FOR DTC

a. Clear the DTC (see DTC CHECK/CLEAR ).

b. Check for the DTC (see DTC CHECK/CLEAR ).

Result

RESULT REFERENCE

B: USE SIMULATION METHOD TO CHECK (See HOW TO PROCEED WITH
TROUBLESHOOTING )

A: GO TO CAN COMMUNICATION SYSTEM (See PRECAUTION )

BLOWER MOTOR CIRCUIT

DESCRIPTION

DTC

DTC Detection Condition

Trouble Area

B1499/99

Open in CAN communication
circuit

CAN communication system

Result

Proceed to

DTC B1499/99 is output

A

DTC B1499/99 is not output

B

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra

The blower motor is operated by signals from the air conditioning amplifier. Blower motor speed signals are
transmitted by changes in the duty ratio.

Duty Ratio:

Fig. 128: Blower Motor Level Graph
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

The duty ratio is the ratio of the blower motor OFF time (B) to the total of the blower motor ON and OFF time
(A + B).

The blower motor controller controls the blower motor speed.

WIRING DIAGRAM

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra

Fig. 129: Blower Motor - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM (BLOWER MOTOR)

a. Select the Active Test, using the Techstream to generate a control command, and then check that

the blower motor operates.

Air Conditioner

ACTIVE TEST REFERENCE

Result

RESULT REFERENCE

B: Go to step 5

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

A: Go to Next Step

Tester Display

Test Part

Control Range Diagnostic Note

Blower Motor Blower motor Min.: 0, Max.: 31

-

Result

Proceed to

NG (blower motor does not operate)

A

NG (blower motor operates but does not change speed)

B

OK

C

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra

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. 130: 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