| Last Modified: 11-27-2007 | 1.6 U | |
| Service Category: Vehicle Interior | Section: Seat | |
| Model Year: 2008 | Model: LX570 | Doc ID: RM000001E1Q00BX |
| Title: SEAT: CLIMATE CONTROL SEAT SYSTEM: TERMINALS OF ECU (2008 LX570) | ||
TERMINALS OF ECU
1. CHECK SEAT CLIMATE CONTROL ECU LH
(a) Disconnect the c38 and c39 ECU connectors.
(b) Measure the voltage and resistance of the wire harness side connectors.
|
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
c38-1 (IG) - Body ground |
G - Body ground |
Power source |
Engine switch on (IG) |
11 to 14 V |
|
c38-2 (B) - Body ground |
G - Body ground |
Power source |
Always |
11 to 14 V |
|
c38-12 (GND) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
If the result is not as specified, there may be a malfunction on the wire harness side.
(c) Reconnect the c38 and c39 ECU connectors.
(d) Measure the voltage and resistance of the connectors.
|
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
c39-1 (B) - Body ground |
W - Body ground |
Power supply for seat heater |
Engine switch on (IG) Climate control seat switch off |
Below 1 V |
|
Engine switch on (IG) Climate control seat switch max warm |
11 to 14 V |
|||
|
c39-5 (E) - Body ground |
B - Body ground |
Ground |
Always |
Below 1 Ω |
|
c39-9 (H5) - Body ground |
LG - Body ground |
Seat heater temperature signal |
Engine switch off |
Below 1 V |
|
Engine switch on (IG) |
1 to 4 V |
|||
|
c39-10 (HS) - Body ground |
O - Body ground |
Seat heater temperature signal ground |
Always |
Below 1 Ω |
|
c38-4 (BFC+) - Body ground |
LG - Body ground |
Seat climate control blower signal (for seat cushion) |
Engine switch on (IG) Climate control seat switch off |
Below 1 V |
|
Engine switch on (IG) Climate control seat switch on |
11 to 14 V |
|||
|
c38-5 (BCS) - Body ground |
L - Body ground |
Seat climate control blower signal (for seat cushion) |
Engine switch on (IG) Climate control seat switch off |
Below 1 V |
|
Engine switch on (IG) Climate control seat switch on (blower position) |
3 to 8 V |
|||
|
c38-6 (BFC-) - Body ground |
B - Body ground |
Seat climate control blower signal (for seat cushion) |
Always |
Below 1 Ω |
|
c38-7 (TDC-) - Body ground |
L - Body ground |
Power supply for seat cushion Peltier element (Cool) |
Engine switch on (IG) Climate control seat switch off |
Below 1 V |
|
Engine switch on (IG) Climate control seat switch max cool |
Pulse generation |
|||
|
c38-8 (TDC+) - Body ground |
R - Body ground |
Power supply for seat cushion Peltier element (Warm) |
Engine switch on (IG) Climate control seat switch off |
Below 1 V |
|
Engine switch on (IG) Climate control seat switch max warm |
Pulse generation |
|||
|
c38-9 (TDB-) - Body ground |
SB - Body ground |
Power supply for seatback Peltier element (Cool) |
Engine switch on (IG) Climate control seat switch off |
Below 1 V |
|
Engine switch on (IG) Climate control seat switch max cool |
Pulse generation |
|||
|
c38-10 (TDB+) - Body ground |
R - Body ground |
Power supply for seatback Peltier element (Warm) |
Engine switch on (IG) Climate control seat switch off |
Below 1 V |
|
Engine switch on (IG) Climate control seat switch max warm |
Pulse generation |
|||
|
c38-14 (V5) - Body ground |
B - Body ground |
Climate control seat switch signal |
Engine switch on (IG) |
5 V |
|
c38-15 (VG) - Body ground |
BR - Body ground |
Climate control seat switch signal ground |
Always |
Below 1 Ω |
|
c38-16 (TCS) - Body ground |
V - Body ground |
Seat climate control controller temperature signal ground (for seat cushion) |
Always |
Below 1 Ω |
|
c38-17 (TBS) - Body ground |
GR - Body ground |
Seat climate control controller temperature signal ground (for seatback) |
Always |
Below 1 Ω |
|
c38-18 (VS) - Body ground |
W - Body ground |
Climate control seat switch signal |
Engine switch on (IG) Climate control seat switch max cool |
Below 1 V |
|
Engine switch on (IG) Climate control seat switch max warm |
5 V |
|||
|
c38-19 (TC5) - Body ground |
Y - Body ground |
Seat climate control controller temperature signal (for seat cushion) |
Engine switch off |
Below 1 V |
|
Engine switch on (IG) |
1 to 4 V |
|||
|
c38-20 (TB5) - Body ground |
G - Body ground |
Seat climate control controller temperature signal (for seatback) |
Engine switch off |
Below 1 V |
|
Engine switch on (IG) |
1 to 4 V |
|||
|
c38-21 (IND) - Body ground |
R - Body ground |
Illumination signal |
Engine switch on (IG) Climate control seat switch off |
Below 1 V |
|
Engine switch on (IG) Climate control seat switch on |
11 to 14 V |
If the result is not as specified, the ECU may have a malfunction.
2. CHECK SEAT CLIMATE CONTROL ECU RH
(a) Disconnect the c24 and c25 ECU connectors.
(b) Measure the voltage and resistance according to the value(s) in the table below.
|
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
c24-1 (IG) - Body ground |
G - Body ground |
Power source |
Engine switch on (IG) |
11 to 14 V |
|
c24-2 (B) - Body ground |
G - Body ground |
Power source |
Always |
11 to 14 V |
|
c24-11 (VER) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
|
c24-12 (GND) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
If the result is not as specified, there may be a malfunction on the wire harness side.
(c) Reconnect the c24 and c25 ECU connectors.
(d) Measure the voltage and resistance according to the value(s) in the table below.
|
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
c25-1 (B) - Body ground |
W - Body ground |
Power supply for seat heater |
Engine switch on (IG) Climate control seat switch off |
Below 1 V |
|
Engine switch on (IG) Climate control seat switch max warm |
11 to 14 V |
|||
|
c25-5 (E) - Body ground |
B - Body ground |
Ground |
Always |
Below 1 Ω |
|
c25-9 (H5) - Body ground |
LG - Body ground |
Seat heater temperature signal |
Engine switch off |
Below 1 V |
|
Engine switch on (IG) |
1 to 4 V |
|||
|
c25-10 (HS) - Body ground |
O - Body ground |
Seat heater temperature signal ground |
Always |
Below 1 Ω |
|
c24-4 (BFC+) - Body ground |
LG - Body ground |
Seat climate control blower signal (for seat cushion) |
Engine switch on (IG) Climate control seat switch off |
Below 1 V |
|
Engine switch on (IG) Climate control seat switch on |
11 to 14 V |
|||
|
c24-5 (BCS) - Body ground |
L - Body ground |
Seat climate control blower signal (for seat cushion) |
Engine switch on (IG) Climate control seat switch off |
Below 1 V |
|
Engine switch on (IG) Climate control seat switch on (blower position) |
3 to 8 V |
|||
|
c24-6 (BFC-) - Body ground |
B - Body ground |
Seat climate control blower signal (for seat cushion) |
Always |
Below 1 Ω |
|
c24-7 (TDC-) - Body ground |
Y - Body ground |
Power supply for seat cushion Peltier element (Cool) |
Engine switch on (IG) Climate control seat switch off |
Below 1 V |
|
Engine switch on (IG) Climate control seat switch max cool |
Pulse generation |
|||
|
c24-8 (TDC+) - Body ground |
R - Body ground |
Power supply for seat cushion Peltier element (Warm) |
Engine switch on (IG) Climate control seat switch off |
Below 1 V |
|
Engine switch on (IG) Climate control seat switch max warm |
Pulse generation |
|||
|
c24-9 (TDB-) - Body ground |
SB - Body ground |
Power supply for seatback Peltier element (Cool) |
Engine switch on (IG) Climate control seat switch off |
Below 1 V |
|
Engine switch on (IG) Climate control seat switch max cool |
Pulse generation |
|||
|
c24-10 (TDB+) - Body ground |
R - Body ground |
Power supply for seatback Peltier element (Warm) |
Engine switch on (IG) Climate control seat switch off |
Below 1 V |
|
Engine switch on (IG) Climate control seat switch max warm |
Pulse generation |
|||
|
c24-14 (V5) - Body ground |
B - Body ground |
Climate control seat switch signal |
Engine switch on (IG) |
5 V |
|
c24-15 (VG) - Body ground |
BR - Body ground |
Climate control seat switch signal ground |
Always |
Below 1 Ω |
|
c24-16 (TCS) - Body ground |
V - Body ground |
Seat climate control controller temperature signal ground (for seat cushion) |
Always |
Below 1 Ω |
|
c24-17 (TBS) - Body ground |
GR - Body ground |
Seat climate control controller temperature signal ground (for seatback) |
Always |
Below 1 Ω |
|
c24-18 (VS) - Body ground |
W - Body ground |
Climate control seat switch signal |
Engine switch on (IG) Climate control seat switch max cool |
Below 1 V |
|
Engine switch on (IG) Climate control seat switch max warm |
5 V |
|||
|
c24-19 (TC5) - Body ground |
L - Body ground |
Seat climate control controller temperature signal (for seat cushion) |
Engine switch off |
Below 1 V |
|
Engine switch on (IG) |
1 to 4 V |
|||
|
c24-20 (TB5) - Body ground |
G - Body ground |
Seat climate control controller temperature signal (for seatback) |
Engine switch off |
Below 1 V |
|
Engine switch on (IG) |
1 to 4 V |
|||
|
c24-21 (IND) - Body ground |
R - Body ground |
Illumination signal |
Engine switch on (IG) Climate control seat switch off |
Below 1 V |
|
Engine switch on (IG) Climate control seat switch on |
11 to 14 V |
If the result is not as specified, the ECU may have a malfunction.
|
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