Blower Motor Circuit
HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: Blower Motor Circuit; 2013 MY FR-S [03/2012 -]
- Blower Motor Circuit
DESCRIPTION
When the heater control Sub-assembly is operated, the Heater relay will turn on to allow current to flow to the blower motor and then the motor will start rotating. Operating the heater control Sub-assembly switches the current flow between the blower resistor and body ground, thus, shifting the operating speed of the blower motor.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
1. INSPECT HEATER BLOWER MOTOR RELAY
(a) Remove the heater blower motor relay.
(b) Inspect the heater blower motor relay Testing and Inspection.
NG -- REPLACE HEATER BLOWER MOTOR RELAY
OK -- Continue to next step.
2. INSPECT BLOWER MOTOR WITH FAN SUB-ASSEMBLY
(a) Disconnect the A31 blower motor with fan sub-assembly connector.
(b) Inspect the blower motor with fan sub-assembly Testing and Inspection.
NG -- REPLACE BLOWER MOTOR WITH FAN SUB-ASSEMBLY Removal
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (HEATER BLOWER MOTOR RELAY - BLOWER MOTOR WITH FAN SUB-ASSEMBLY)
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. INSPECT HEATER CONTROL SUB-ASSEMBLY
(a) Remove the heater control sub-assembly Disassembly.
(b) Inspect the heater control sub-assembly Testing and Inspection.
NG -- REPLACE HEATER CONTROL SUB-ASSEMBLY Disassembly
OK -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (HEATER BLOWER MOTOR RELAY - HEATER CONTROL SUB-ASSEMBLY)
(a) Disconnect the D23 heater control sub-assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
6. CHECK HARNESS AND CONNECTOR (BLOWER MOTOR WITH FAN SUB-ASSEMBLY - HEATER CONTROL SUB-ASSEMBLY)
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
7. CHECK HARNESS AND CONNECTOR (HEATER CONTROL SUB-ASSEMBLY - BODY GROUND)
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
8. INSPECT BLOWER RESISTOR
(a) Remove the blower resister Removal.
(b) Inspect the blower resistor Testing and Inspection.
NG -- REPLACE BLOWER RESISTOR Removal
OK -- Continue to next step.
9. CHECK HARNESS OR CONNECTOR (HEATER CONTROL SUB-ASSEMBLY - BLOWER RESISTOR)
(a) Disconnect the A26 blower resister connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
10. CHECK HARNESS OR CONNECTOR (BLOWER MOTOR WITH FAN SUB-ASSEMBLY - BLOWER RESISTOR)
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
11. CHECK HARNESS AND CONNECTOR (BLOWER RESISTOR - BODY GROUND)
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures