DESCRIPTION
The blower motor with fan sub-assembly is operated by signals from the air conditioning amplifier assembly. Blower motor speed signals are transmitted in accordance with changes in the duty ratio.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
1. |
PERFORM ACTIVE TEST USING TECHSTREAM |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Air Conditioner / Active Test.
(e) Perform the Active Test according to the display on the Techstream.
Body Electrical > Air Conditioner > Active Test
Tester Display |
Measurement Item |
Control Range |
Diagnostic Note |
---|---|---|---|
Blower Motor |
Blower motor with fan sub-assembly |
Min.: 0, Max.: 31 |
- |
Tester Display |
---|
Blower Motor |
Result |
Proceed to |
---|---|
OK |
A |
NG (Blower motor with fan sub-assembly does not operate) |
B |
NG (Blower motor with fan sub-assembly operates but does not change speed) |
C |
A |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
C |
GO TO STEP 6 |
|
2. |
CHECK HARNESS AND CONNECTOR (BLOWER MOTOR WITH FAN SUB-ASSEMBLY - BODY GROUND) |
(a) Disconnect the A85 blower motor with fan sub-assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
A85-1 (GND) - Body ground |
Always |
Below 1 Ω |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
3. |
CHECK HARNESS AND CONNECTOR (BLOWER MOTOR WITH FAN SUB-ASSEMBLY - BATTERY) |
(a) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
4. |
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - BLOWER MOTOR WITH FAN SUB-ASSEMBLY) |
(a) Disconnect the F139 air conditioning amplifier assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
F139-6 (BLW) - A85-2 (SI) |
Always |
Below 1 Ω |
F139-6 (BLW) or A85-2 (SI) - Body ground |
Always |
10 kΩ or higher |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
5. |
INSPECT BLOWER MOTOR WITH FAN SUB-ASSEMBLY |
(a) Reconnect the A85 blower motor with fan sub-assembly connector.
(b) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
NG |
REPLACE BLOWER MOTOR WITH FAN SUB-ASSEMBLY |
|
6. |
INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY |
(a) Reconnect the F139 air conditioning amplifier assembly connector.
(b) Turn the ignition switch ON.
(c) Turn the blower switch on (LO).
(d) Connect an oscilloscope to terminals F139-6 (BLW) and F139-4 (GND) of the air conditioning amplifier assembly and check the waveform. OK: Waveform is similar to that shown in the illustration. HINT: The waveform varies with the blower speed.
|
|
OK |
REPLACE BLOWER MOTOR WITH FAN SUB-ASSEMBLY |
NG |
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
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Summary of functions
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DTC No.
Detection Item
DTC Detection Condition
Trouble Area
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