Toyota Tundra (2015 year). Manual — part 2264
OK
OK
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
CONDITION
SPECIFIED CONDITION
HTR H-fuse
Always
Below 1 Ω
NG
REPLACE FUSE
3.
CHECK HARNESS AND CONNECTOR (BLOWER MOTOR - BATTERY AND BODY
GROUND)
(a) Disconnect the J32 blower motor connector.
(b) Measure the resistance and voltage according to the
value(s) in the table below.
Standard resistance:
TESTER CONNECTION
CONDITION
SPECIFIED CONDITION
J32-1 (GND) - Body ground
Always
Below 1 Ω
Standard voltage:
TESTER CONNECTION
CONDITION
SPECIFIED CONDITION
J32-3 (+B) - Body ground
Always
11 to 14 V
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic A...
OK
4.
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BLOWER
MOTOR)
(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:
TESTER CONNECTION
CONDITION
SPECIFIED
CONDITION
J19-23 (BLW) - J32-2 (S1)
Always
Below 1 Ω
J19-23 (BLW) or J32-2 (S1) - Body
ground
Always
10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
5.
CHECK BLOWER MOTOR (S1 VOLTAGE)
AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic A...
OK
(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:
TESTER CONNECTION
SWITCH
CONDITION
SPECIFIED
CONDITION
J19-23 (BLW) - Body
ground
Ignition switch ON
4.5 to 5.5 V
NG
REPLACE BLOWER MOTOR
6.
CHECK AIR CONDITIONING AMPLIFIER (BLW VOLTAGE)
(a) Remove the air conditioning amplifier with its connectors
still connected
.
(b) Turn the ignition switch ON.
(c) Turn the blower switch LO.
(d) Using an oscilloscope, check the waveform.
Standard:
TESTER
CONNECTION
TOOL SETTING
SWITCH
CONDITION
SPECIFIED
CONDITION
J19-23 (BLW) -
J19-14 (GND)
1 V/DIV., 500
µsec./DIV.
Ignition switch
ON
Blower switch
LO
Pulse
generation
HINT:
Waveform varies with the blower level.
AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic A...
NG
REPLACE AIR CONDITIONING AMPLIFIER
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN
IN PROBLEM SYMPTOMS TABLE
AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic A...
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