- Transponder key ECU
- Unlock warning switch
- Harness or connector
| Last Modified: 11-29-2007 | 1.6 C | |
| Service Category: Vehicle Interior | Section: Theft Deterrent/Keyless Entry | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM000001TCI007X |
| Title: THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILISER SYSTEM: DESCRIPTION (2008 Sequoia) | ||
|
DTC |
B2780 |
Push Switch / Key Unlock Warning Switch Malfunction |
DESCRIPTION
This DTC will be output if the transponder key ECU does not detect that the unlock warning switch is ON even when the ignition switch is ON. Under normal conditions, the unlock warning switch is ON when the ignition switch is ON.
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
B2780 |
Unlock warning switch ON is not detected when the ignition switch is ON. |
|
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
When the transponder key ECU is replaced, reregister the ECU - ECM communication ID
.
PROCEDURE
|
1. |
READ VALUE USING TECHSTREAM (UNLOCK WARNING SWITCH) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Immobiliser / Data List.
(e) Use the Data List to check if the unlock warning switch is functioning properly.
Immobiliser
|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
Key SW |
Unlock warning switch signal / ON or OFF |
ON: Key is in ignition key cylinder OFF: No key is in ignition key cylinder |
- |
OK:
ON (key is in ignition key cylinder) appears on the screen.
|
|
2. |
INSPECT UNLOCK WARNING SWITCH |
(a) Remove the unlock warning switch
.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
1 - 2 |
Switch is free |
Below 1 Ω |
|
Switch is not pushed |
10 kΩ or higher |
(c) Reinstall the unlock warning switch.
|
|
3. |
CHECK HARNESS AND CONNECTOR (UNLOCK WARNING SWITCH - BODY GROUND) |
(a) Disconnect the H21 switch connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
H21-2 - Body ground |
Always |
Below 1 Ω |
(c) Reconnect the switch connector.
|
|
4. |
CHECK HARNESS AND CONNECTOR (UNLOCK WARNING SWITCH - TRANSPONDER KEY ECU) |
(a) Disconnect the H21 switch connector.
(b) Disconnect the H32 ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
H32-3 (KSW) - H21-1 |
Always |
Below 1 Ω |
|
H32-3 (KSW) or H21-1 - Body ground |
Always |
10 kΩ or higher |
(d) Reconnect the switch connector.
(e) Reconnect the ECU connector.
|
|
|