DESCRIPTION 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: 
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 
PROCEDURE
(a) Remove the HTR H-fuse from the engine room relay block, junction block. (b) Measure the resistance according to the value(s) in the table below. Standard resistance:
(a) Disconnect the J32 blower motor connector. (b) Measure the resistance and voltage according to the value(s) in the table below. Standard resistance:
Standard voltage:
(a) Disconnect the J19 air conditioning amplifier connector. (b) Disconnect the J32 blower motor connector. (c) Measure the resistance according to the value(s) in the table below. Standard resistance:
(a) Disconnect the J19 air conditioning amplifier connector. (b) Reconnect the J32 blower motor connector. (c) Measure the voltage according to the value(s) in the table below. Standard voltage:
(a) Remove the air conditioning amplifier with its connectors still connected
(see page (b) Turn the ignition switch ON. (c) Turn the blower switch LO. (d) Using an oscilloscope, check the waveform. Standard:
HINT: Waveform varies with the blower level.
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Toyota Tundra Service Manual > Key Reminder Warning System: Operation Check
OPERATION CHECK 1. CHECK KEY REMINDER WARNING SYSTEM (a) Check that the key reminder warning buzzer sounds. (1) With the driver side door closed, insert the key into the ignition key cylinder and then turn the key to the LOCK or ACC position. (2) Check that the buzzer sounds intermittently if the dr ...
