Toyota Tacoma (2015-2018) Service Manual: No Answer-Back

Toyota Tacoma (2015-2018) Service Manual / Door Lock / Wireless Door Lock Control System(w/o Smart Key System) / No Answer-Back

DESCRIPTION

In some cases, 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 cases, hazard warning light and wireless door lock buzzer signal outputs from the main body ECU (multiplex network body ECU) may be malfunctioning.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

The wireless door lock control system uses the CAN communication system. First, confirm that there is no malfunction in the CAN communication system. Refer to the How to Proceed with Troubleshooting procedure (See page ).

PROCEDURE

1.	READ VALUE USING TECHSTREAM (ANSWER-BACK OPERATION)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Customize Setting / Wireless Door Lock.

(e) Select the setting by referring to the table below.

Display	Default	Content	Setting	Relevant ECU
Hazard Answer Back	ON	When the doors are locked by wireless operation, the hazard warning lights flash once. When the doors are unlocked by wireless operation, the hazard warning lights flash twice.	OFF or ON	Main body ECU (Multiplex network body ECU)
Wireless Buzzer Resp	ON	Wireless door lock buzzer response	OFF or ON	Main body ECU (Multiplex network body ECU)
Wireless Buzzer Vol	Level 5	Wireless door lock buzzer volume	Level 7, Level 6, Level 5, Level 4, Level 3, Level 2, Level 1 or Level 0	Main body ECU (Multiplex network body ECU)

Display

Default

Content

Setting

Relevant ECU

Hazard Answer Back

When the doors are locked by wireless operation, the hazard warning lights flash once.

When the doors are unlocked by wireless operation, the hazard warning lights flash twice.

OFF or ON

Main body ECU (Multiplex network body ECU)

Wireless Buzzer Resp

Wireless door lock buzzer response

OFF or ON

Main body ECU (Multiplex network body ECU)

Wireless Buzzer Vol

Level 5

Wireless door lock buzzer volume

Level 7, Level 6, Level 5, Level 4, Level 3, Level 2, Level 1 or Level 0

Main body ECU (Multiplex network body ECU)

Result

Result	Proceed to
Both items are ON and except Level 0	A
Either item is OFF or Level 0	B

PERFORM CUSTOMIZE FUNCTION

2.	CHECK WIRELESS DOOR LOCK CONTROL FUNCTIONS

(a) Check the wireless door lock control function using the door control transmitter module set sub-assembly.

Result

Result	Proceed to
Wireless door lock/unlock operates normally.	A
Wireless door lock/unlock does not operate normally.	B

GO TO PROBLEM SYMPTOMS TABLE

3.	READ VALUE USING TECHSTREAM (DOOR UNLOCK DETECTION SWITCH)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to 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
FR Door Lock Pos	Front door RH unlock detection switch signal/LOCK or UNLOCK	LOCK: Front door RH locked UNLOCK: Front door RH unlocked	-
FL Door Lock Pos	Front door LH unlock detection switch signal/LOCK or UNLOCK	LOCK: Front door LH locked UNLOCK: Front door LH unlocked	-
RR-Door Lock Pos SW1, 3	Rear door RH and LH unlock detection switch signal/ON or OFF	ON: Rear door RH or LH unlocked OFF: Rear door RH and LH locked	-
RL-Door Lock Pos SW2, 3	Rear door RH and LH unlock detection switch signal/ON or OFF	ON: Rear door RH or LH unlocked OFF: Rear door RH and LH locked	-

*1: When checking RR- Door Lock Pos SW, make sure to check it with the rear door LH locked.
*2: When checking RL- Door Lock Pos SW, make sure to check it with the rear door RH locked.
*3: for Double Cab

OK:

The Techstream should display as shown in the table according to door lock operation.

GO TO LIGHTING SYSTEM (Proceed to Door Unlock Detection Switch Circuit)

4.	CHECK WIRELESS ANSWER-BACK OPERATION

(a) Check the wireless answer-back operation using the door control transmitter module set sub-assembly.

Result

Result	Proceed to
Only wireless door lock buzzer answer-back does not occur.	A
Only hazard warning light answer-back does not occur.	B

GO TO STEP 10

5.	PERFORM ACTIVE TEST USING TECHSTREAM (WIRELESS DOOR LOCK BUZZER)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Body Electrical / Main Body / Active Test.

(e) Perform the Active Test according to the display on the Techstream.

Main Body

Tester Display	Test Part	Control Range	Diagnostic Note
Wireless Buzzer	Turns the wireless door lock buzzer	ON/OFF	-

Result

Result	Proceed to
Wireless door lock buzzer does not turn on/off.	A
Wireless door lock buzzer turns on/off.	B

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

6.	CHECK HARNESS AND CONNECTOR (WIRELESS DOOR LOCK BUZZER - DRIVER SIDE JUNCTION BLOCK)

(a) Disconnect the W3 wireless door lock buzzer connectors.

(b) Disconnect the 1F driver side junction block connectors.

Standard Resistance:

Tester Connection	Condition	Specified Condition
W3-1 - 1F-29	Always	Below 1 Ω
W3-2 - Body ground	Always	Below 1 Ω
W3-1 - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.	CHECK DRIVER SIDE JUNCTION BLOCK

(a) Remove the driver side junction block (See page Text in Illustration ).

Text in Illustration

Component without harness connected

(Driver Side Junction Block)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
1F-29 - MB-21 (BZR)	Always	Below 1 Ω

REPLACE DRIVER SIDE JUNCTION BLOCK

8.	REPLACE WIRELESS DOOR LOCK BUZZER

(a) Temporarily replace the wireless door lock buzzer with a new one (See page ).

9.	CHECK WIRELESS DOOR LOCK BUZZER OPERATION

(a) Check the operation of the wireless answer-back function.

OK:

Wireless answer-back function operates normally.

END (WIRELESS DOOR LOCK BUZZER WAS DEFECTIVE)

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

10.	CHECK HAZARD WARNING LIGHTS OPERATION

(a) Check that the hazard warning light blinks when the hazard warning signal switch is pressed.

OK:

Hazard warning light signal is normally.

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

GO TO LIGHTING SYSTEM (Proceed to Hazard Warning Switch Circuit)

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