Toyota Tacoma (2015-2018) Service Manual: Hazard Warning Switch Circuit

Toyota Tacoma (2015-2018) Service Manual / Lighting / Lighting System / Hazard Warning Switch Circuit

DESCRIPTION

The combination meter assembly receives information signals from the telltale light assembly (hazard warning signal switch).

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.	READ VALUE USING TECHSTREAM (HAZARD FLASHER SWITCH)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

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

(e) According to the display on the Techstream, read the Data List.

Combination Meter

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Hazard Flasher Switch	Hazard warning signal switch / OFF or ON	OFF: Hazard warning signal switch off ON: Hazard warning signal switch on	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Hazard Flasher Switch

Hazard warning signal switch /

OFF or ON

OFF: Hazard warning signal switch off

ON: Hazard warning signal switch on

OK:

Normal conditions listed above are displayed.

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.	CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BATTERY)

(a) Disconnect the combination meter assembly connector.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
C10-1 (B) - Body Ground	Always	11 to 14 V

Text in Illustration

*a	Front view of wire harness connector (to Combination Meter Assembly)

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY - COMBINATION METER ASSEMBLY)

(a) Disconnect the A33 air conditioning control assembly connector.

(b) Disconnect the C9 combination meter assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A33-4 (HAZ) - C9-13 (HAZ)	Always	Below 1 Ω
A33-1 (GND) - Body Ground	Always	Below 1 Ω
A33-4 (HAZ) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	REPLACE AIR CONDITIONING CONTROL ASSEMBLY (HAZARD WARNING SIGNAL SWITCH)

(a) Replace the air conditioning control assembly (hazard warning signal switch) (See page ).

5.	READ VALUE USING TECHSTREAM (HAZARD FLASHER SWITCH)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

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

(e) According to the display on the Techstream, read the Data List.

Combination Meter

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Hazard Flasher Switch	Hazard warning signal switch / OFF or ON	OFF: Hazard warning signal switch off ON: Hazard warning signal switch on	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Hazard Flasher Switch

Hazard warning signal switch /

OFF or ON

OFF: Hazard warning signal switch off

ON: Hazard warning signal switch on

OK:

Normal conditions listed above are displayed.

END (AIR CONDITIONING CONTROL ASSEMBLY (HAZARD WARNING SIGNAL SWITCH) WAS DEFECTIVE)

REPLACE COMBINATION METER ASSEMBLY

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