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 engine switch on (IG).
(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 A16 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 |
---|---|---|
A16-1 (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:
Tester Connection | Condition | Specified Condition |
---|---|---|
A16-3 (+B) - Body ground | Always | 11 to 14 V |
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 J43 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 |
---|---|---|
J43-6 (BLW) - A16-2 (SI) | Always | Below 1 Ω |
J43-6 (BLW) or A16-2 (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 A16 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 J43 air conditioning amplifier assembly connector.
(b) Turn the engine switch on (IG).
(c) Turn the blower switch on (LO).
(d) Measure the waveform between terminals J43-6 (BLW) and J43-4 (GND) of the air conditioning amplifier assembly. 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 |
Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual > Dynamic Radar Cruise Control System: Data List / Active Test
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