Blower Motor Circuit

HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: Blower Motor Circuit
- Blower Motor Circuit

DESCRIPTION

When the No. 2 heater control (blower switch) is set to position 1 or higher, the contact of the HTR relay is closed, current flows to the blower motor, and the blower motor operates. The blower motor speed can be changed by exchanging the ground and the blower resistor circuit with the No. 2 heater control (blower switch).

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedures.

PROCEDURE

1. INSPECT HTR RELAY

(a) Remove the HTR relay.





(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





(c) Reinstall the HTR relay.

NG -- REPLACE HTR RELAY
OK -- Continue to next step.

2. INSPECT BLOWER MOTOR WITH FAN SUB-ASSEMBLY

(a) 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 (HTR RELAY - IG1 NO. 1 RELAY)

(a) Remove the HTR Relay.





(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:





Text in Illustration





(c) Reinstall the HTR Relay.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (HTR RELAY - NO. 2 HEATER CONTROL SUB-ASSEMBLY)

(a) Disconnect the D6 No. 2 heater control sub-assembly (blower switch) connector.





(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:





Text in Illustration





(c) Reconnect the No. 2 heater control sub-assembly (blower switch) connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

5. CHECK HARNESS AND CONNECTOR (HTR RELAY - BLOWER MOTOR WITH FAN SUB-ASSEMBLY)

(a) Disconnect the D14 blower motor with fan sub-assembly connector.





(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:





Text in Illustration





(c) Reconnect the blower motor with fan sub-assembly connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

6. CHECK HARNESS AND CONNECTOR (BLOWER RESISTOR - BLOWER MOTOR WITH FAN SUB-ASSEMBLY)

(a) Disconnect the D13 blower resistor connector.

(b) Disconnect the D14 blower motor with fan sub-assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





(d) Reconnect the blower motor with fan sub-assembly connector.

(e) Reconnect the blower resistor connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

7. INSPECT BLOWER RESISTOR

(a) Inspect the blower resistor Testing and Inspection.

NG -- REPLACE BLOWER RESISTOR Removal
OK -- Continue to next step.

8. INSPECT NO. 2 HEATER CONTROL SUB-ASSEMBLY

(a) Inspect the No. 2 heater control sub-assembly Testing and Inspection.

NG -- REPLACE NO. 2 HEATER CONTROL SUB-ASSEMBLY Disassembly
OK -- Continue to next step.

9. CHECK HARNESS AND CONNECTOR (NO. 2 HEATER CONTROL SUB-ASSEMBLY - BLOWER RESISTOR)

(a) Disconnect the D6 No. 2 heater control sub-assembly (blower switch) connector.

(b) Disconnect the D13 blower resistor connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





(d) Reconnect the blower resistor connector.

(e) Reconnect the No. 2 heater control sub-assembly (blower switch) connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (BLOWER RESISTOR - BODY GROUND)