- Unlock warning switch assembly
- Wire harness
- Transponder key ECU assembly
| Last Modified: 7-3-2017 | 6.8:8.0.40 | Doc ID: RM00000185L001X |
| Model Year Start: 2007 | Model: LX470 | Prod Date Range: [08/2006 - ] |
| Title: ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM: B2780; Push Switch / Key Unlock Warning Switch Malfunction; 2007 MY LX470 [08/2006 - ] | ||
|
DTC |
B2780 |
Push Switch / Key Unlock Warning Switch Malfunction |
DESCRIPTION
This DTC is detected when the transponder key ECU does not detect the unlock warning switch ON even with the ignition switch ON. In normal condition, the unlock warning switch should be ON when the ignition switch ON.
|
DTC No. |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
B2780 |
Unlock warning switch ON is not detected when ignition switch is ON |
|
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
When using the intelligent tester, start from *1. When not using the intelligent tester, start from *2.
PROCEDURE
|
1. |
READ VALUE USING INTELLIGENT TESTER (UNLOCK WARNING SWITCH ASSEMBLY) *1 |
(a) Check the DATA LIST for proper functioning of the unlock warning switch.
Transponder key ECU assembly
|
Item |
Measurement Item / Display (Range) |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
KEY SW |
Unlock warning switch signal / ON or OFF |
OFF: No key is in ignition key cylinder ON: Key is in ignition key cylinder |
- |
OK:
ON (key is in ignition key cylinder) appears on screen.
| OK |
|
|
|
2. |
INSPECT UNLOCK WARNING SWITCH ASSEMBLY *2 |
(a) Remove the switch.
|
(b) Measure the resistance of the switch. Standard resistance:
|
|
| NG |
|
|
|
3. |
CHECK WIRE HARNESS (UNLOCK WARNING SWITCH - TRANSPONDER KEY ECU AND BODY GROUND) |
(a) Disconnect the U1 switch connector.
(b) Disconnect the T27 ECU connector.
(c) Measure the resistance of the wire harness side connectors.
Standard resistance:
|
Tester Connection |
Specified Condition |
|---|---|
|
U1-1 Body ground |
Below 1 Ω |
|
T27-10 (KSW) - U1-2 |
| NG |
|
| OK |
|
|
4. |
CHECK FOR DTC |
(a)
Delete the DTC
![2007 MY LX470 [08/2006 - ]; ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM: DTC CHECK / CLEAR](../../../../stylegraphics/info.gif "2007 MY LX470 [08/2006 - ]; ENGINE IMMOBILISER: ENGINE IMMOBILISER SYSTEM: DTC CHECK / CLEAR")
.
(b) Recheck for DTC.
OK:
B2780 is not output.
| NG |
|
| OK |
|
|
|