| Last Modified: 11-29-2007 | 1.6 U | |
| Service Category: Vehicle Interior | Section: Theft Deterrent/Keyless Entry | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM000002X2W002X |
| Title: THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILISER SYSTEM: TERMINALS OF ECU (2008 Sequoia) | ||
TERMINALS OF ECU
1. CHECK TRANSPONDER KEY AMPLIFIER
(a) Disconnect the H27 amplifier connector.
(b) Measure the resistance according to the value(s) in the table below.
|
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
H27-7 (AGND) - Body ground |
GR - 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 H27 amplifier connector.
(d) Measure the resistance and voltage according to the value(s) in the table below.
|
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
H27-1 (VC5) - H27-7 (AGND) |
G - GR |
Power supply |
No key in ignition key cylinder |
Below 1 V |
|
Key inserted in ignition key cylinder |
4.6 to 5.4 V |
|||
|
H27-4 (CODE) - H27-7 (AGND) |
LG - GR |
Demodulated signal of key code data |
No key in ignition key cylinder |
Below 1 V |
|
Key inserted in ignition key cylinder |
Pulse generation (see waveform 1) |
|||
|
H27-5 (TXCT) - H27-7 (AGND) |
L - GR |
Key code output signal |
No key in ignition key cylinder |
Below 1 V |
|
Key inserted in ignition key cylinder |
Pulse generation (see waveform 2) |
|||
|
H27-7 (AGND) - Body ground |
GR - Body ground |
Ground |
Always |
Below 1 Ω |
If the result is not as specified, the amplifier may have a malfunction.
|
(e) Using an oscilloscope, check the waveform 1.
|
|
(f) Using an oscilloscope, check the waveform 2.
|
2. CHECK TRANSPONDER KEY ECU
(a) Disconnect the H32 ECU 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 |
|---|---|---|---|---|
|
H32-16 (GND) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
|
H32-1 (+B) - H32-16 (GND) |
G - W-B |
Battery |
Always |
11 to 14 V |
|
H32-2 (IG) - H32-16 (GND) |
GR - W-B |
Ignition switch |
Ignition switch off |
Below 1 V |
|
Ignition switch ON |
11 to 14 V |
|||
|
H32-3 (KSW) - H32-16 (GND) |
LG - W-B |
Unlock warning switch |
No key in ignition key cylinder |
10 kΩ or higher |
|
Key inserted in ignition key cylinder |
Below 1 Ω |
If the result is not as specified, there may be a malfunction on the wire harness side.
(c) Reconnect the H32 ECU connector.
(d) Measure the resistance and voltage according to the value(s) in the table below.
|
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
|---|---|---|---|---|
|
H32-14 (VC5) - H32-16 (GND) |
G - W-B |
Power source |
No key in ignition key cylinder |
Below 1 V |
|
Key inserted in ignition key cylinder |
4.6 to 5.4 V |
|||
|
H32-7 (CTY) - H32-16 (GND) |
Y - W-B |
Door courtesy |
Door closed |
10 kΩ or higher |
|
Door open |
Below 1 Ω |
|||
|
H32-4 (TXCT) - H32-16 (GND) |
L - W-B |
Transponder key amplifier communication signal |
No key in ignition key cylinder |
Below 1 V |
|
Key inserted in ignition key cylinder |
Pulse generation (see waveform 1) |
|||
|
H32-15 (CODE) - H32-16 (GND) |
LG - W-B |
Transponder key amplifier communication signal |
No key in ignition key cylinder |
Below 1 V |
|
Key inserted in ignition key cylinder |
Pulse generation (see waveform 2) |
|||
|
H32-13 (EFIO) - H32-16 (GND) |
Y - W-B |
ECM output signal |
Ignition switch off |
Below 1 V |
|
Ignition switch ON |
Pulse generation (see waveform 3) |
|||
|
H32-12 (EFII) - H32-16 (GND) |
SB - W-B |
ECM input signal |
Always |
Pulse generation (see waveform 4) |
|
H32-8 (IND) - H32-16 (GND) |
V - W-B |
Security indicator light signal |
Immobiliser set status |
Alternating between 11 to 14 V and below 1 V |
|
Immobiliser unset status |
Below 1 V |
|||
|
H32-9 (D) - H32-16 (GND) |
L - W-B |
Diagnosis tester communication |
Always |
Pulse generation |
If the result is not as specified, the ECU may have a malfunction.
|
(e) Using an oscilloscope, check the waveform 1.
|
|
(f) Using an oscilloscope, check the waveform 2.
|
|
(g) Using an oscilloscope, check the waveform 3.
|
|
(h) Using an oscilloscope, check the waveform 4.
|
|
|