Toyota 4Runner manuals

Toyota 4Runner: Driver Side Door Entry Unlock Function does not Operate

DESCRIPTION

If the driver side door entry unlock function does not operate but the entry lock function operates, the communication line between the vehicle and electrical key transmitter is normal. The part at fault may be an unlock sensor circuit (front door outside handle assembly [for driver side] → certification ECU).

WIRING DIAGRAM


CAUTION / NOTICE / HINT

NOTICE:

  • The smart key system (for Entry Function) uses a multiplex communication system (LIN communication system) and the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting (See page ). Troubleshoot the smart key
    system (for Entry Function) after confirming that the communication systems are functioning properly.
  • When using the Techstream with the engine switch off to troubleshoot: Connect the Techstream to the DLC3 and turn a courtesy light switch on and off at 1.5-second intervals until communication between the Techstream and vehicle begins.
  • Check that there are no electrical key transmitters in the vehicle.
  • Before performing the inspection, check that DTC B1242 (wireless door lock control) is not output (See page
    ).
  • When checking the entry lock operation multiple times, the lock operation may be limited to 2 consecutive operations depending on the settings. In order to perform the entry lock operation 3 or more times, an unlock operation must be performed once (any type of unlock operation is sufficient). However, only consecutive entry lock operations are limited. Using the wireless lock or other types of lock operations, it is possible to perform consecutive lock operations without this limitation.
  • Before replacing the certification ECU, refer to the engine immobiliser system (w/ Smart Key System) (See page
    ).

PROCEDURE

1.

CHECK POWER DOOR LOCK OPERATION

(a) When the door control switch on the multiplex network master switch assembly is operated, check that the doors unlock and lock according to the switch operation (See page ).


OK:

Door locks operate normally.


NG

GO TO POWER DOOR LOCK CONTROL SYSTEM

OK

2.

READ VALUE USING TECHSTREAM (DOOR LOCK POSITION SWITCH)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Main Body / Data List.

(e) Read the Data List according to the display on the Techstream.

Main Body

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

FL Door Lock Pos

Front LH side door lock position switch signal / UNLOCK or LOCK

UNLOCK: Front LH side door unlocked

LOCK: Front LH side door locked

-

OK:

On the Techstream screen, the display changes between LOCK and UNLOCK as shown in the chart above.


NG

GO TO POWER DOOR LOCK CONTROL SYSTEM (Proceed to Only Driver Door Lock/Unlock Functions do not Operate)

OK

3.

READ VALUE USING TECHSTREAM (UNLOCK SENSOR)

(a) Using the Techstream, read the Data List (See page ).


Smart Key

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

D-Door Touch Sensor

Driver side door unlock sensor / ON or OFF

ON: Driver side door unlock sensor touched

OFF: Driver side door unlock sensor not touched

-

OK:

"ON" (unlock sensor is touched) and "OFF" (unlock sensor is not touched) appear on the screen.


OK

REPLACE CERTIFICATION ECU

NG

4.

CHECK HARNESS AND CONNECTOR (FRONT DOOR OUTSIDE HANDLE - CERTIFICATION ECU)

(a) Disconnect the M1 handle connector.

(b) Disconnect the F79 ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

M1-4 (SENS) - F79-20 (SEN1)

Always

Below 1 Ω

F79-20 (SEN1) - Body ground

Always

10 kΩ or higher


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

CHECK FRONT DOOR OUTSIDE HANDLE ASSEMBLY (FOR DRIVER SIDE)

(a) Measure the voltage according to the value(s) in the table below.

Text in Illustration

*a

Component with harness connected

(Certification ECU)

-

-

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

F79-20 (SEN1) - F79-15 (E)

Engine switch off, all doors locked, key not sufficiently close to vehicle and unlock sensor (for driver side) off → on

Pulse generation → Below 2 V


OK

REPLACE CERTIFICATION ECU


NG

REPLACE FRONT DOOR OUTSIDE HANDLE ASSEMBLY (FOR DRIVER SIDE)

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