Replace Blower Motor

CHECK HARNESS AND CONNECTOR (HTR FUSE - MAIN BODY ECU)

Wire Harness Side:

Main Body ECU Rear View

Prius Body Ecu

E120471E01

(a) Disconnect the 4L main body ECU connector.

(b) Measure the voltage. Standard voltage

Tester Connection

Condition

Specified Condition

4L-1 - Body ground

Always

11 to 14 V

(c) Reconnect the main body ECU connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK MAIN BODY ECU

Main Body ECU Rear View:

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Corolla Ecu Main Body

HTR-5 HTR-4 HTR-3

4F-7

HTR-5 HTR-4 HTR-3

Main Body ECU Front View:

4Q-5

E120470E01

(a) Remove the HTR relay from the main body ECU.

(b) Measure the resistance. Standard resistance

Tester Connection

Specified Condition

4F-7 - HTR-3

Below 1 Q

4E-17 - HTR-4

Below 1 Q

(c) Measure the voltage. Standard voltage

Tester Connection

Condition

Specified Condition

HTR-5 - Body ground

Always

11 to 14 V

(d) Reinstall the HTR relay.

(e) Measure the voltage. Standard voltage

Tester Connection

Condition

Specified Condition

4Q-5 - Body ground

Ignition switch ON

11 to 14 V

REPLACE MAIN BODY ECU

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - HEATER CONTROL (BLOWER SWITCH))

Wire Harness Side:

Heater Control (Blower Switch) Connector

n

E120224E04

(a) Disconnect the E1 heater control (blower switch) connector.

(b) Measure the voltage. Standard voltage

Tester Connection

Condition

Specified Condition

E1-9 (LO) - Body ground

Ignition switch ON

11 to 14 V

(c) Reconnect the heater control (blower switch) connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BLOWER MOTOR)

Wire Harness Side:

Blower Motor Connector £

Front View

E119793E04

(a) Disconnect the E4 blower motor connector.

(b) Measure the voltage. Standard voltage

Tester Connection

Condition

Specified Condition

E4-1 (+B) - Body ground

Ignition switch ON

11 to 14 V

(c) Reconnect the blower motor connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR

CHECK HARNESS AND CONNECTOR (BLOWER RESISTOR - BLOWER MOTOR)

Wire Harness Side:

Blower Resistor Connector m.

Front View Blower Motor Connector r^ A

Cii) frrmi

Front View

(a) Disconnect the E3 blower resistor connector.

(b) Disconnect the E4 blower motor connector.

(c) Measure the resistance. Standard resistance

Tester Connection

Specified Condition

E3-4 - E4-1

Below 1 Q

(d) Reconnect the blower resistor connector.

(e) Reconnect the blower motor connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR

INSPECT BLOWER RESISTOR

Component Side:

Blower Resistor

E120977E01

(a) Remove the blower resistor.

(b) Measure the resistance. Standard resistance

Tester Connection

Specified Condition

4 - 1

3.12 to 3.60Q

4 - 3

1.45 to 1.67Q

4 - 2

0.52 to 0.60Q

(c) Reinstall the blower resistor.

REPLACE BLOWER RESISTOR

INSPECT HEATER CONTROL (BLOWER SWITCH)

Component Side:

Heater Control (Blower Switch)

HI LO M1 M2

E117010E05

(a) Remove the heater control (blower switch).

(b) Measure the resistance. Standard resistance

Switch Position

Tester Connection

Specified Condition

G

ALL - 5 (E)

10 kQ or higher

1

S (LO) - 5 (E)

Below 1 Q

1 - 2

S (LO) - 5 (E) - 7 (M1)

Below 1 Q

2

S (LO) - 5 (E) - 7 (M1)

Below 1 Q

2 - S

S (LO) - 5 (E) - 7 (M1) - S (M2)

Below 1 Q

S

S (LO) - 5 (E) - S (M2)

Below 1 Q

S - 4

S (LO) - 5 (E) - S (M2) -1G (HI)

Below 1 Q

4

S (LO) - 5 (E) - 1G (HI)

Below 1 Q

(c) Reinstall the heater control (blower switch).

REPLACE HEATER CONTROL

CHECK HARNESS AND CONNECTOR (HEATER CONTROL (BLOWER SWITCH) BLOWER RESISTOR)

Wire Harness Side:

Heater Control (Blower Switch) Connector

1

L

2

3

4

5'"'

6

S

8

9

y

Front View

Blower Resistor Connector ra

Front View

(a) Disconnect the E1 heater control (blower switch) connector.

(b) Disconnect the E3 blower resistor connector.

(c) Measure the resistance. Standard resistance

Tester Connection

Specified Condition

E1-5 (E) - ES-1

Below 1 Q

E1-S (M2) - ES-2

Below 1 Q

E1-7 (M1) - ES-S

Below 1 Q

E1-1G (HI) - ES-4

Below 1 Q

(d) Reconnect the heater control (blower switch) connector.

(e) Reconnect the blower resistor connector.

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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