- Air mix rear damper servo
- No. 2 air conditioning harness
- Harness or connector between No. 2 air conditioning harness and air conditioning amplifier
- Air conditioning amplifier
| Last Modified: 11-29-2007 | 1.6 C | |
| Service Category: Vehicle Interior | Section: Heating/Air Conditioning | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM000003F02000X |
| Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: DESCRIPTION (2008 Sequoia) | ||
|
DTC |
B1447/47 |
Rear Air Mix Damper Control Servo Motor Circuit |
DESCRIPTION
The air mix rear damper servo sends pulse signals to indicate the damper position to the air conditioning amplifier. The air conditioning amplifier activates the motor (normal or reverse) based on these signals to move the rear air mix damper to the appropriate position. This adjusts the amount of air passing through the heater core after passing the evaporator and controls the temperature of the blown air.
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
B1447/47 |
Rear air mix damper position does not change even if air conditioning amplifier operates rear air mix damper servo motor |
|
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
|
1. |
READ VALUE USING TECHSTREAM (AIR MIX TARG PULSE (R)) |
(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 / Data List / Air Mix Targ Pulse (R).
(e) According to the display on the Techstream, read the Data List.
Air Conditioner
|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
Air Mix Targ Pulse (R) |
Rear air mix servo motor target pulse / Min.: 0, Max.: 255 |
Customized value displayed |
- |
OK:
The display is as specified in the normal condition.
Result
|
Result |
Proceed to |
|---|---|
|
NG |
A |
|
OK (When troubleshooting according to Problem Symptoms Table) |
B |
|
OK (When troubleshooting according to the DTC output) |
C |
|
|
2. |
CHECK HARNESS AND CONNECTOR (NO. 2 AIR CONDITIONING HARNESS - AIR CONDITIONING AMPLIFIER) |
|
(a) Disconnect the P9 No. 2 air conditioning harness connector. |
(b) Disconnect the H67 air conditioning amplifier connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
P9-2 (RBUG) - H67-21 (RBUG) |
Always |
Below 1 Ω |
|
P9-3 (RBUS) - H67-1 (RBUS) |
Always |
Below 1 Ω |
|
P9-4 (RBBU) - H67-23 (RBBU) |
Always |
Below 1 Ω |
|
H67-21 (RBUG) - Body ground |
Always |
10 kΩ or higher |
|
H67-1 (RBUS) - Body ground |
Always |
10 kΩ or higher |
|
H67-23 (RBBU) - Body ground |
Always |
10 kΩ or higher |
(d) Reconnect the air conditioning amplifier connector.
(e) Reconnect the No. 2 air conditioning harness connector.
|
|
3. |
REPLACE AIR MIX REAR DAMPER SERVO |
(a) Replace the air mix rear damper servo motor
.
|
|
4. |
CHECK FOR DTC |
(a) Clear the DTCs
.
(b) Check for DTCs
.
OK:
DTC is not output
|
|
5. |
REPAIR OR REPLACE NO. 2 AIR CONDITIONING HARNESS |
(a) Repair or replace the No. 2 air conditioning harness
.
|
|
6. |
CHECK FOR DTC |
(a) Clear the DTCs
.
(b) Check for DTCs
.
OK:
DTC is not output
|
|
|