| Last Modified: 11-29-2007 | 1.6 U | |
| Service Category: Vehicle Exterior | Section: Window/Glass | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM000002ZC900EX |
| Title: WINDOW / GLASS: WINDOW DEFOGGER SYSTEM: TERMINALS OF ECU (2008 Sequoia) | ||
TERMINALS OF ECU
1. CHECK AIR CONDITIONING AMPLIFIER
(a) Disconnect the H24 air conditioning amplifier connector.
(b) Measure the resistance and voltage according to the value(s) in the table below.
|
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
H24-1 (IG+) - H24-14 (GND) |
P - W-B |
Ignition power supply |
Ignition switch ON |
11 to 14 V |
|
Ignition switch off |
Below 1 V |
|||
|
H24-21 (B) - H24-14 (GND) |
R - W-B |
Battery power source |
Always |
11 to 14 V |
|
H24-14 (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 H24 air conditioning amplifier connector.
(d) Measure the voltage according to the value(s) in the table below.
|
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
H24-11 (CANH) - H24-14 (GND) |
B - W-B |
Hi-level CAN bus line |
Ignition switch ON |
Pulse generation (see waveform 1) |
|
H24-12 (CANL) - H24-14 (GND) |
W - W-B |
Lo-level CAN bus line |
Ignition switch ON |
Pulse generation (see waveform 2) |
|
H24-37 (LIN1) - H24-14 (GND) |
SB - W-B |
LIN communication signal |
Ignition switch ON |
Pulse generation |
|
H24-38 (RDEF) - H24-14 (GND) |
R - W-B |
Defogger relay |
Ignition switch ON Defogger switch OFF |
11 to 14 V |
|
Ignition switch ON Back door window closed Defogger switch ON |
Below 1 V |
If the result is not as specified, the air conditioning amplifier may have a malfunction.
|
(e) Waveform 1 (Reference) : Using an oscilloscope
HINT:
The waveform varies depending on the CAN communication signal. |
|
(f) Waveform 2 (Reference) : Using an oscilloscope
HINT:
The waveform varies depending on the CAN communication signal. |
2. CHECK INTEGRATION CONTROL AND PANEL
(a) Disconnect the H45 integration control and panel connector.
(b) Measure the resistance and voltage according to the value(s) in the table below.
|
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
H45-16 (IG+) - H45-1 (GND) |
P - W-B |
Ignition power supply |
Ignition switch off |
Below 1 V |
|
Ignition switch ON |
11 to 14 V |
|||
|
H45-1 (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 H45 integration control and panel connector.
(d) Measure the voltage according to the value(s) in the table below.
|
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
H45-3 (STX) - H45-1 (GND) |
SB - W-B |
LIN communication circuit |
Ignition switch ON |
Pulse generation |
If the result is not as specified, the integration control and panel may have a malfunction.
|
|