Toyota Tacoma (2015-2018) Service Manual: Diagnosis System

Toyota Tacoma (2015-2018) Service Manual / Door Lock / Wireless Door Lock Control System(w/ Smart Key System) / Diagnosis System

DIAGNOSIS SYSTEM

1. DESCRIPTION

The ECU stores trouble codes when malfunctions occur.

The diagnostic system allows for reading of the trouble codes from the DLC3.

Use the Techstream to help diagnose and repair the problem.

2. CHECK DLC3

(a) Check the DLC3 (See page 3. INSPECT BATTERY VOLTAGE ).

3. INSPECT BATTERY VOLTAGE

(a) Measure the battery voltage.

Standard voltage:

11 to 14 V

If the voltage is below 11 V, recharge or replace the battery.

4. SELF-DIAGNOSTIC MODE

(a) Connect the Techstream to the DLC3.

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

(d) Enter the following menus: Body Electrical / Smart Key / Utility / Wireless Door Lock Diagnosis Mode.

(e) Proceed to the next step in accordance with the prompts on the Techstream screen.

HINT:

The electrical key transmitter uses 2 different frequencies alternately for communication. When in self diagnostic mode, one of the channels can be selected or the channels can be automatically switched.

(f) Check that the system has switched to self-diagnostic mode by checking the wireless door lock buzzer output pattern.

(g) Check the diagnostic outputs when the electrical key transmitter sub-assembly switch is held down.

The diagnostic outputs can be checked by the interior light and wireless door lock buzzer patterns.

Result

Wireless Door Lock Buzzer Output	Suspected Area
A	Normal (No malfunction)
B	Register wireless code
C	Wave interference or malfunction of a related component

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 ...

Dtc Check / Clear

DTC CHECK / CLEAR 1. CHECK FOR DTC HINT: 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 ...

Other materials:

Operation Check
OPERATION CHECK 1. CHECK SMART KEY SYSTEM (for Entry Function) OPERATION NOTICE: Make sure that the smart key system (for Entry Function) has not been canceled before performing this inspection. (a) Check the entry unlock function (driver door). (1) Perform a wireless lock operation to lock t ...

Data List / Active Test
DATA LIST / ACTIVE TEST 1. DATA LIST NOTICE: In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not. HINT: Using the Techstream to read the Data List allows t ...

Air Mix Damper Control Servo Motor Circuit (Passenger Side) (B1441/41)
DESCRIPTION This No. 2 air conditioning radiator damper servo sub-assembly (for front passenger side air mix) is controlled by the air conditioning amplifier assembly and moves the air mix damper (for front passenger side) to the desired position. DTC No. DTC Detection Co ...