- Main body ECU
- Engine switch
- Harness or connector
| Last Modified: 11-27-2007 | 1.6 C | |
| Service Category: Vehicle Interior | Section: Theft Deterrent/Keyless Entry | |
| Model Year: 2008 | Model: LX570 | Doc ID: RM000000Y7Z02YX |
| Title: THEFT DETERRENT / KEYLESS ENTRY: SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function): DESCRIPTION (2008 LX570) | ||
|
DTC |
B2278 |
Engine Switch Circuit Malfunction |
DESCRIPTION
This DTC is stored when: 1) a malfunction is detected between the main body ECU and the engine switch; or 2) either of the switches inside the engine switch is malfunctioning.
|
DTC Code |
Detection Condition |
Trouble Area |
|---|---|---|
|
B2278 |
Communication between the main body ECU and engine switch is abnormal or the engine switch is defective. |
|
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
|
1. |
READ VALUE USING TECHSTREAM (START SWITCH 1, 2) |
(a) Use the Data List to check if the engine switch is functioning properly.
Main Body
|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
Start Switch1 |
Start switch 1/ON or OFF |
ON: Engine switch on (IG) OFF: Engine switch off |
- |
|
Start Switch2 |
Start switch 2/ON or OFF |
ON: Engine switch on (IG) OFF: Engine switch off |
- |
OK:
When the engine switch is turned on (IG), ON is displayed on the Techstream.
|
|
2. |
CHECK WHETHER DTC OUTPUT RECURS |
(a) Clear the DTCs
.
(b) Turn the engine switch on (IG), and check whether DTC B2278 is output.
Result
|
Result |
Proceed to |
|---|---|
|
No DTC output |
A |
|
DTC B2278 output |
B |
|
|
4. |
INSPECT ENGINE SWITCH |
(a) Disconnect the E18 engine switch connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
7 (SS1) - 5 (GND) |
Pushed |
Below 1 Ω |
|
2 (SS2) - 5 (GND) |
Pushed |
Below 1 Ω |
|
7 (SS1) - 5 (GND) |
Not pushed |
10 kΩ or higher |
|
2 (SS2) - 5 (GND) |
Not pushed |
10 kΩ or higher |
|
|
5. |
CHECK HARNESS AND CONNECTOR (ENGINE SWITCH - MAIN BODY ECU AND BODY GROUND) |
(a) Disconnect the E1 main body ECU connector.
(b) Disconnect the E18 engine switch connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
E1-17 (SSW1) - E18-7 (SS1) |
Always |
Below 1 Ω |
|
E1-16 (SSW2) - E18-2 (SS2) |
Always |
Below 1 Ω |
|
E18-5 (GND) - Body ground |
Always |
Below 1 Ω |
|
E1-17 (SSW1) or E18-7 (SS1) - Body ground |
Always |
10 kΩ or higher |
|
E1-16 (SSW2) or E18-2 (SS2) - Body ground |
Always |
10 kΩ or higher |
|
|
|