Toyota 4Runner: Only Wireless Control Function is Inoperative

Toyota 4Runner Service Manual / Vehicle Interior / Door Lock / Wireless Door Lock Control System(w/o Smart Key System) / Only Wireless Control Function is Inoperative

DESCRIPTION

The door control receiver receives signals from the transmitter and sends these signals to the main body ECU. The main body ECU then controls all the doors by sending lock/unlock signals to each door.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.
When replacing the door control receiver, refer to the registration procedures (See page ).

PROCEDURE

1.	CHECK POWER DOOR LOCK OPERATION

(a) Check the power door lock operation (See page ).

OK:

Each door locks and unlocks normally.

Go to POWER DOOR LOCK CONTROL SYSTEM

2.	CHECK KEY REMINDER WARNING OPERATION

(a) Check the key reminder buzzer operation (See page ).

HINT:

If the key reminder buzzer is functioning normally, it can be assumed that the unlock warning switch is also functioning normally.

OK:

Key reminder buzzer operates normally.

Go to KEY REMINDER WARNING SYSTEM

3.	CHECK WIRELESS DOOR CONTROL TRANSMITTER

(a) Check whether the wireless door lock control functions operate normally with another registered transmitter.

OK:

Wireless door lock control functions operate normally.

GO TO STEP 5

4.	CHECK TRANSMITTER BATTERY

(a) Remove the battery from the inoperative wireless door control transmitter (See page ).

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
Battery positive (+) - Battery negative (-)	Always	2.5 to 3.2 V

REPLACE DOOR CONTROL TRANSMITTER

REPLACE TRANSMITTER BATTERY

5.	CHECK FOR ELECTRICAL NOISE

(a) Move the transmitter in the vicinity of the door control receiver.

HINT:

Refer to Parts Location for the location of the door control receiver (See page ).

(b) Press and hold either the lock or unlock transmitter switch for 1 second, and check that the doors are locked or unlocked accordingly.

OK:

Wireless door lock control functions operate normally.

HINT:

Check if electrical noise is the cause by moving the door control transmitter closer to the door control receiver. Moving closer will decrease the effects of electrical noise.
If the operation check can be performed normally, there is a high probability that electrical noise or a decrease in output from the door control transmitter is the cause of the malfunction. There is a high probability that electrical noise is the cause if the problem occurs only in a certain location or only during a certain time of day. Also, custom components may be causing electrical noise. If custom components are installed in the vehicle, remove them and perform the operation check again.

FIND CAUSE OF ELECTRICAL NOISE AND REMOVE IT

6.	CHECK HARNESS AND CONNECTOR (DOOR CONTROL RECEIVER - MAIN BODY ECU)

(a) Disconnect the O11 receiver connector.

(b) Disconnect the F9 ECU connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
O11-2 (RDA) - F9-26 (RDA)	Always	Below 1 Ω
O11-3 (PRG) - F9-25 (PRG)	Always	Below 1 Ω
O11-2 (RDA) or F9-26 (RDA) - Body ground	Always	10 kΩ or higher
O11-3 (PRG) or F9-25 (PRG) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.	CHECK HARNESS AND CONNECTOR (DOOR CONTROL RECEIVER - BATTERY AND BODY GROUND)

(a) Disconnect the O11 receiver connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
O11-1 (GND) - Body ground	Always	Below 1 Ω

Standard Voltage:

Tester Connection	Condition	Specified Condition
O11-5 (+B) - Body ground	Always	11 to 14 V

Text in Illustration

*a	Front view of wire harness connector (to Door Control Receiver)

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.	CHECK DOOR CONTROL RECEIVER (OUTPUT)

(a) Using an oscilloscope, check the waveform.

Measurement Condition

Item	Content
Tester Connection	O11-2 (RDA) - Body ground
Tool Setting	10 V/DIV., 50 μsec./DIV.
Condition	No key in ignition key cylinder, all doors closed and transmitter switch off → on

OK:

Waveform is output normally (refer to illustration).

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

REPLACE DOOR CONTROL RECEIVER

Wireless Door Lock Tuner Circuit Malfunction (B1242)

DESCRIPTION The door control receiver receives signals from the transmitter and sends these signals to the main body ECU. This DTC is stored when the applicable RDA signal cannot be received with ...

No Answer-Back

DESCRIPTION In some cases, the wireless door lock control functions are normal but the hazard warning light and/or wireless door lock buzzer answer-back function(s) does not operate. In such case ...

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