| Last Modified: 11-29-2007 | 1.6 J | |
| Service Category: Vehicle Interior | Section: Heating/Air Conditioning | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM000003F04000X |
| Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: DESCRIPTION (2008 Sequoia) | ||
|
Rear Blower Motor Circuit |
DESCRIPTION
The rear blower motor is operated by signals from the air conditioning amplifier. Rear blower motor speed signals are transmitted in accordance with changes in the duty ratio.
Duty Ratio:
The duty ratio is the ratio of the blower motor OFF time (B) to the total of the blower motor ON and OFF time (A + B).
The blower motor controller controls the blower motor speed.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
|
1. |
PERFORM ACTIVE TEST USING TECHSTREAM (REAR BLOWER MOTOR) |
(a) Connect the Techstream to DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Air Conditioner / Active Test / Rear Blower Motor
(e) According to the display on the Techstream, check rear blower motor operation while performing the Active Test.
Air Conditioner
|
Tester Display |
Test Part |
Control Range |
Diagnostic Note |
|---|---|---|---|
|
Rear Blower Motor |
Rear blower motor |
Min.: 0, Max.: 31 |
- |
Result
|
Result |
Proceed to |
|---|---|
|
Rear blower motor operates normally |
A |
|
Rear blower motor does not operate |
B |
|
Rear blower motor operates but does not change speed |
C |
|
|
2. |
INSPECT FUSE (RR HTR) |
|
(a) Remove the RR HTR fuse from the engine room relay block. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
RR HTR fuse |
Always |
Below 1 Ω |
(c) Reinstall the RR HTR fuse.
|
|
3. |
INSPECT REAR BLOWER MOTOR (SYSTEM VOLTAGE) |
|
(a) Disconnect the P10 rear blower motor connector. |
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
P10-2 (B) - Body ground |
Always |
11 to 14 V |
(c) Reconnect the rear blower motor connector.
|
|
4. |
INSPECT REAR BLOWER MOTOR |
|
(a) Remove rear blower motor
|
(b) Check the rear blower motor.
OK:
|
Tester Connection |
Specified Condition |
|---|---|
|
Battery positive (+) → 2 (B) Battery negative (-) → 1 (L) |
The rear blower motor operates smoothly. |
(c) Reinstall the rear blower motor.
|
|
5. |
CHECK HARNESS AND CONNECTOR (REAR BLOWER MOTOR - REAR BLOWER MOTOR CONTROL, BODY GROUND) |
|
(a) Disconnect the P10 rear blower motor connector. |
(b) Disconnect the P11 rear blower motor control connector.
(c) Measure the resistance according the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
P10-2 (B) - -2 (VM) |
Always |
Below 1 Ω |
|
P10-1 (L) - Body ground |
Always |
Below 1 Ω |
|
P10-2 (B) - Body ground |
Always |
10 kΩ or higher |
(d) Reconnect the rear blower motor control connector.
(e) Reconnect the rear blower motor connector.
|
|
6. |
CHECK HARNESS AND CONNECTOR (REAR BLOWER MOTOR CONTROL - FUSE, BODY GROUND) |
|
(a) Disconnect the P11 rear blower motor control connector. |
(b) Measure the resistance and voltage according the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
P11-6 (GND) - Body ground |
Always |
Below 1 Ω |
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
P11-1 (+B) - Body ground |
Ignition switch ON |
11 to 14 V |
(c) Reconnect the rear blower motor control connector.
|
|
7. |
CHECK HARNESS AND CONNECTOR (REAR BLOWER MOTOR CONTROL - AIR CONDITIONING AMPLIFIER) |
|
(a) Disconnect the P11 rear blower motor control connector. |
(b) Disconnect the H67 air conditioning amplifier connector.
(c) Measure the resistance according the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
P11-3 (SI)- H67-22 (BLWH) |
Always |
Below 1 Ω |
|
P11-3 (SI) - Body ground |
Always |
10 kΩ or higher |
(d) Reconnect the air conditioning amplifier connector.
(e) Reconnect the rear blower motor control connector.
|
|
8. |
INSPECT REAR BLOWER MOTOR CONTROL |
|
(a) Disconnect the H67 air conditioning amplifier connector. |
(b) Measure the voltage according the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
-22 (BLWH) - -20 (RGND) |
Ignition switch ON Rear blower motor switch OFF |
4.5 to 5.5 V |
(c) Reconnect the air conditioning amplifier connector.
|
|
9. |
INSPECT AIR CONDITIONING AMPLIFIER |
|
(a) Remove the air conditioning amplifier with its connectors still connected
|
(b) Check the waveform of the air conditioning amplifier connector.
|
Tester Connection |
BLWH - RGND |
|
Tool Setting |
1 V/DIV., 500 μsec./DIV. |
|
Condition |
Ignition switch ON Blower switch LO |
|
|
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