Lexus NX: Hazard Warning Switch Circuit

DESCRIPTION

When the combination meter receives a hazard warning signal switch signal, the flasher IC turns on and hazard control is performed.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When replacing the combination meter assembly, make sure to replace it with a new one.

PROCEDURE

1.

READ VALUE USING TECHSTREAM (HAZARD FLASHER SWITCH)

(a) Using the Techstream, read the Data List.

Click here

Body Electrical > Combination Meter > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Hazard Flasher Switch

Hazard warning signal switch signal

ON or OFF

ON: Hazard switch on

OFF: Hazard switch off

-

Body Electrical > Combination Meter > Data List

Tester Display

Hazard Flasher Switch

OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

2.

INSPECT AIR CONDITIONING CONTROL ASSEMBLY (HAZARD WARNING SWITCH)

(a) Remove the air conditioning control assembly (hazard warning switch).

Click here

(b) Inspect the air conditioning control assembly (hazard warning switch).

Click here

NG

REPLACE AIR CONDITIONING CONTROL ASSEMBLY (HAZARD WARNING SIGNAL SWITCH)

OK

3.

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING CONTROL ASSEMBLY [HAZARD WARNING SWITCH] - COMBINATION METER ASSEMBLY)

(a) Disconnect the I13 air conditioning control assembly (hazard warning switch) connector.

(b) Disconnect the I11 combination meter assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I13-9 (HAZ) - I11-2 (HZSW)

Always

Below 1 Ω

I13-11 (LJB) - I11-12 (HAZM)

Always

Below 1 Ω

I13-14 (GND) - Body ground

Always

Below 1 Ω

I13-9 (HAZ) or I11-2 (HZSW) - Body ground

Always

10 kΩ or higher

I13-11 (LJB) or I11-12 (HAZM) - Body ground

Always

10 kΩ or higher

OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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