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
INSPECTION PROCEDURE
Note
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
PERFORM ACTIVE TEST USING GTS
Connect the GTS to the DLC3.
Turn the engine switch on (IG).
Turn the GTS on.
Enter the following menus: Body Electrical / Air Conditioner / Active Test.
Check the operation by referring to the table below.
Tester Display | Test Part | Control Range | Diagnostic Note |
---|---|---|---|
Blower Motor | Blower motor with fan sub-assembly | Min.: 0, Max.: 31 | - |
Result | ||||||||
---|---|---|---|---|---|---|---|---|
|
B |
CHECK HARNESS AND CONNECTOR (BLOWER MOTOR WITH FAN SUB-ASSEMBLY - BODY GROUND) Click here |
C |
INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY Click here |
A |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here
CHECK HARNESS AND CONNECTOR (BLOWER MOTOR WITH FAN SUB-ASSEMBLY - BODY GROUND)
Disconnect the H53 blower motor with fan sub-assembly connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
CHECK HARNESS AND CONNECTOR (BLOWER MOTOR WITH FAN SUB-ASSEMBLY - BATTERY)
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
---|---|---|---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - BLOWER MOTOR WITH FAN SUB-ASSEMBLY)
Disconnect the H54 air conditioning amplifier assembly connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||
---|---|---|---|---|---|---|---|---|---|
|
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
INSPECT BLOWER MOTOR WITH FAN SUB-ASSEMBLY
Reconnect the H53 blower motor with fan sub-assembly connector.
*a | Front view of wire harness connector (to Air Conditioning Amplifier Assembly) |
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
---|---|---|---|---|---|---|
|
NG |
REPLACE BLOWER MOTOR WITH FAN SUB-ASSEMBLY Click here |
OK |
INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY
*a | Component with harness connected (Air Conditioning Amplifier Assembly) |
Remove the air conditioning amplifier assembly Click here.
Reconnect the H54 air conditioning amplifier assembly connector.
Turn the engine switch on (IG).
Turn the blower switch on (LO).
Measure the waveform between terminal H54-22 (BLW) of the air conditioning amplifier assembly and body ground.
OK |
---|
Waveform is similar to that shown in the illustration. |
Tech Tips
The waveform varies with the blower speed.
Item | Content |
---|---|
Tool setting | 1 V/DIV., 500 μs./DIV. |
Vehicle condition | Engine switch on (IG) Blower switch on (LO) |
NG |
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here |
OK |
REPLACE BLOWER MOTOR WITH FAN SUB-ASSEMBLY Click here