Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: 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

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.

(c) Turn the Techstream 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

-

OK:

Normal conditions listed above are displayed.

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

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)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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.

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

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

REPLACE AIR CONDITIONING CONTROL ASSEMBLY (HAZARD WARNING SIGNAL SWITCH)

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

NEXT

5.

READ VALUE USING TECHSTREAM (HAZARD FLASHER SWITCH)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream 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

-

OK:

Normal conditions listed above are displayed.

OK

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

NG

REPLACE COMBINATION METER ASSEMBLY

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