Toyota 4Runner manuals

Toyota 4Runner: Push Switch / Key Unlock Warning Switch Malfunction (B2780)

DESCRIPTION

This DTC is stored if the transponder key ECU assembly does not detect that the unlock warning switch assembly is on even when the ignition switch is ON. Under normal conditions, the unlock warning switch assembly is on when the ignition switch is ON.

DTC Code

DTC Detection Condition

Trouble Area

B2780

The unlock warning switch assembly is not detected as being on when the ignition switch is ON.

  • Transponder key ECU assembly
  • Unlock warning switch assembly
  • Harness or connector

WIRING DIAGRAM


CAUTION / NOTICE / HINT

NOTICE:

When the transponder key ECU assembly is replaced, refer to Registration (See page ).


PROCEDURE

1.

CLEAR DTC

(a) Clear the DTCs (See page ).


NEXT

2.

CHECK FOR DTC

(a) Check for DTCs (See page ).


OK:

DTC B2780 is not output.


OK

USE SIMULATION METHOD TO CHECK

NG

3.

INSPECT UNLOCK WARNING SWITCH ASSEMBLY

(a) Remove the unlock warning switch assembly (See page ).



(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

1 - 2

Pushed

Below 1 Ω

Not pushed

10 kΩ or higher


NG

REPLACE UNLOCK WARNING SWITCH ASSEMBLY

OK

4.

CHECK HARNESS AND CONNECTOR (UNLOCK WARNING SWITCH - TRANSPONDER KEY ECU AND BODY GROUND)

(a) Disconnect the F18 switch connector.

(b) Disconnect the F34 ECU connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

F34-3 (KSW) - F18-1

Always

Below 1 Ω

F34-3 (KSW) or F18-1 - Body ground

Always

10 kΩ or higher

F18-2 - Body ground

Always

Below 1 Ω


OK

REPLACE TRANSPONDER KEY ECU ASSEMBLY


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are lis ...

Data List / Active Test
DATA LIST / ACTIVE TEST 1. READ DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing ...

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