| Last Modified: 11-29-2007 | 1.6 J | |
| Service Category: Vehicle Interior | Section: Theft Deterrent/Keyless Entry | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM0000028IX00KX |
| Title: THEFT DETERRENT / KEYLESS ENTRY: THEFT DETERRENT SYSTEM: DESCRIPTION (2008 Sequoia) | ||
|
Ignition Switch Circuit |
DESCRIPTION
The main body ECU determines the ignition switch position (off, ACC, ON) based on signals from the IG or ACC circuit.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
|
1. |
READ VALUE USING TECHSTREAM |
(a) Connect a Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream main switch on.
(d) Select the items below in the Data List and read the display on the Techstream.
Main Body
|
Item |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
IG SW |
Ignition switch ON signal ON/OFF |
ON: Ignition switch is ON OFF: Ignition switch is off |
- |
|
ACC SW |
Ignition switch ACC signal ON/OFF |
ON: Ignition switch is ACC OFF: Ignition switch is off |
- |
OK:
When the ignition switch is operated, the display changes as shown in the table.
|
|
3. |
INSPECT FUSES (AM1, ECU-IG No. 2) |
|
(a) Remove the AM1 and ECU-IG No. 2 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 |
|---|---|---|
|
AM1 fuse |
Always |
Below 1 Ω |
|
ECU-IG No. 2 fuse |
Always |
Below 1 Ω |
|
|
4. |
CHECK HARNESS AND CONNECTOR (BATTERY - MAIN BODY ECU) |
|
(a) Disconnect the DA main body ECU connector. |
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
DA-1 - Body ground |
Always |
11 to 14 V |
|
|
5. |
INSPECT IGNITION SWITCH ASSEMBLY |
|
(a) Disconnect the H10 ignition switch connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
1 - 4 |
Ignition switch ON |
Below 1 Ω |
|
2 - 4 |
Ignition switch ACC |
Below 1 Ω |
|
|
6. |
CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - IGNITION SWITCH AND BODY GROUND) |
|
(a) Disconnect the DD main body ECU connector. |
(b) Disconnect the H10 ignition switch connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
DD-47 - H10-4 (AM1) |
Always |
Below 1 Ω |
|
DD-43 - H10-1 (IG1) |
Always |
Below 1 Ω |
|
DD-45 - H10-2 (ACC) |
Always |
Below 1 Ω |
|
DD-62 - Body ground |
Always |
Below 1 Ω |
|
DD-47 - Body ground |
Always |
10 kΩ or higher |
|
DD-43 - Body ground |
Always |
10 kΩ or higher |
|
DD-45 - Body ground |
Always |
10 kΩ or higher |
|
|
|