| Last Modified: 11-29-2007 | 1.6 J | |
| Service Category: Vehicle Interior | Section: Seat | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM000001ZVP00DX |
| Title: SEAT: CLIMATE CONTROL SEAT SYSTEM: DESCRIPTION (2008 Sequoia) | ||
|
Climate Control Seat System does not Operate |
DESCRIPTION
The air conditioning amplifier assembly receives seat heater switch position signals when the ignition switch ON, and then transmits airflow amount signals to each seat climate blower.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
|
1. |
CHECK CLIMATE CONTROL SEAT SYSTEM OPERATION |
(a) Check if the climate control seat system operates normally.
Result
|
Result |
Proceed to |
|---|---|
|
Climate control does not operate on both driver and passenger sides |
A |
|
Climate control does not operate on driver side |
B |
|
Climate control does not operate on front passenger side |
C |
|
|
2. |
INSPECT FUSE (LH-IG, SEAT-HTR) |
|
(a) Remove the LH-IG and SEAT-HTR fuses from the main body ECU. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
LH-IG fuse |
Always |
Below 1 Ω |
|
SEAT-HTR fuse |
Always |
Below 1 Ω |
|
|
3. |
CHECK HARNESS AND CONNECTOR (SEAT HEATER SWITCH) |
|
(a) Disconnect the H47 and H49 switch connectors. |
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
H47-8 (IG) - Body ground |
Ignition switch ON |
11 to 14 V |
|
H49-12 (IG) - Body ground |
Ignition switch ON |
11 to 14 V |
|
|
4. |
CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL BLOWER - BATTERY AND BODY GROUND) |
|
(a) Disconnect the X13 and W16 blower connectors. |
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
X13-1 (IG) - Body ground |
Ignition switch ON |
11 to 14 V |
|
W16-1 (IG) - Body ground |
Ignition switch ON |
11 to 14 V |
|
|
5. |
CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL BLOWER LH - BATTERY AND BODY GROUND) |
|
(a) Disconnect the X13 blower connector. |
(b) Measure the voltage and resistance according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
X13-1 (IG) - Body ground |
Ignition switch ON |
11 to 14 V |
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
X13-4 (GND) - Body ground |
Always |
Below 1 Ω |
(c) Reconnect the X13 blower connector.
|
(d) Disconnect the X14 blower connector. |
(e) Measure the voltage and resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
X14-1 (GND) - Body ground |
Always |
Below 1 Ω |
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
X14-2 (IG) - Body ground |
Ignition switch ON |
11 to 14 V |
|
|
6. |
INSPECT SEAT CLIMATE CONTROL BLOWER LH |
|
(a) Check the input signal waveform. (1) Connect an oscilloscope to terminal X13-3 (SIGN) and body ground with the climate control blower connector still connected. (2) Check the signal waveform according to the condition(s) in the table below.
OK: The waveform is displayed as shown in the illustration. |
Result
|
Result |
Proceed to |
|---|---|
|
NG |
A |
|
OK (Seat cushion blower side) |
B |
|
OK (Seatback blower side) |
C |
|
|
7. |
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - SEAT CLIMATE CONTROL BLOWER LH) |
|
(a) Disconnect the H67 amplifier connector. |
(b) Disconnect the X13 blower connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
H67-9 (SHD+) - X13-3 (SIGN) |
Always |
Below 1 Ω |
|
H67-9 (SHD+) - Body ground |
Always |
10 kΩ or higher |
|
|
8. |
CHECK HARNESS AND CONNECTOR (SEAT HEATER SWITCH LH) |
|
(a) Disconnect the H47 switch connector. |
(b) Measure the voltage and resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
H47-3 (E) - Body ground |
Always |
Below 1 Ω |
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
H47-8 (IG) - Body ground |
Ignition switch ON |
11 to 14 V |
|
|
9. |
INSPECT SEAT HEATER SWITCH LH |
|
(a) Remove the seat heater switch
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
5 (BLLH) - 4 (SW-) |
Seat Heater switch OFF |
1.54 to 2.86 kΩ |
|
Seat heater switch blower side volume 3 |
Below 0.1 kΩ |
|
|
10. |
CHECK HARNESS AND CONNECTOR (SEAT HEATER SWITCH LH - AIR CONDITIONING AMPLIFIER) |
|
(a) Disconnect the H67 amplifier connector. |
(b) Disconnect the H47 switch connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
H47-3 (E) - Body ground |
Always |
Below 1 Ω |
|
H47-4 (SW-) - H67-6 (SG-5) |
Always |
Below 1 Ω |
|
H47-4 (SW-) - Body ground |
Always |
10 kΩ or higher |
|
H47-5 (BLLH) - H67-15 (AD-4) |
Always |
Below 1 Ω |
|
H47-5 (BLLH) - Body ground |
Always |
10 kΩ or higher |
|
H47-10 (SW+) - H67-8 (S5-2) |
Always |
Below 1 Ω |
|
H47-10 (SW+) - Body ground |
Always |
10 kΩ or higher |
|
|
11. |
CHECK HARNESS AND CONNECTOR (SEAT CLIMATE CONTROL BLOWER RH - BATTERY AND BODY GROUND) |
|
(a) Disconnect the W16 blower connector. |
(b) Measure the voltage and resistance according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
W16-1 (IG) - Body ground |
Ignition switch ON |
11 to 14 V |
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
W16-4 (GND) - Body ground |
Always |
Below 1 Ω |
(c) Reconnect the W16 blower connector.
|
(d) Disconnect the W17 blower connector. |
(e) Measure the voltage and resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
W17-1 (GND) - Body ground |
Always |
Below 1 Ω |
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
W17-2 (IG) - Body ground |
Ignition switch ON |
11 to 14 V |
|
|
12. |
INSPECT SEAT CLIMATE CONTROL BLOWER RH |
|
(a) Check the input signal waveform. (1) Connect an oscilloscope to terminal W16-3 (SIGN) and body ground with the climate control blower connector still connected. (2) Check the signal waveform according to the condition(s) in the table below.
OK: The waveform is displayed as shown in the illustration. |
Result
|
Result |
Proceed to |
|---|---|
|
NG |
A |
|
OK (Seat cushion blower side) |
B |
|
OK (Seatback blower side) |
C |
|
|
13. |
CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - SEAT CLIMATE CONTROL BLOWER RH) |
|
(a) Disconnect the H67 amplifier connector. |
(b) Disconnect the W16 blower connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
H67-10 (SHP+) - W16-3 (SIGN) |
Always |
Below 1 Ω |
|
H67-10 (SHP+) - Body ground |
Always |
10 kΩ or higher |
|
|
14. |
CHECK HARNESS AND CONNECTOR (SEAT HEATER SWITCH RH) |
|
(a) Disconnect the H49 switch connector. |
(b) Measure the voltage and resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
H49-3 (E) - Body ground |
Always |
Below 1 Ω |
Standard Voltage:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
H49-12 (IG) - Body ground |
Ignition switch ON |
11 to 14 V |
|
|
15. |
INSPECT SEAT HEATER SWITCH RH |
|
(a) Remove the seat heater switch
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
7 (BLRH) - 6 (SVSG) |
Seat Heater switch OFF |
1.54 to 2.86 kΩ |
|
Seat heater switch blower side volume 3 |
Below 0.1 kΩ |
|
|
16. |
CHECK HARNESS AND CONNECTOR (SEAT HEATER SWITCH RH - AIR CONDITIONING AMPLIFIER) |
|
(a) Disconnect the H67 amplifier connector. |
(b) Disconnect the H49 switch connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
H49-3 (E) - Body ground |
Always |
Below 1 Ω |
|
H49-6 (SVSG) - H67-6 (SG- 5) |
Always |
Below 1 Ω |
|
H49-6 (SVSG) - Body ground |
Always |
10 kΩ or higher |
|
H49-7 (BLRH) - H67-16 (AD-5) |
Always |
Below 1 Ω |
|
H49-7 (BLRH) - Body ground |
Always |
10 kΩ or higher |
|
H49-14 (SVS5) - H67-8 (S5-2) |
Always |
Below 1 Ω |
|
H49-14 (SVS5) - Body ground |
Always |
10 kΩ or higher |
|
|
|