ESS (EMERGENCY STOP SIGNAL SYSTEM) DOES NOT OPERATE [EMERGENCY STOP SIGNAL SYSTEM (ESS)]

id0903j7014800

Note

• If there is any vehicle malfunction complaint lodged by a customer, perform FOREWORD [EMERGENCY STOP SIGNAL SYSTEM (ESS)] malfunction diagnosis according to the troubleshooting procedure. (See FOREWORD [EMERGENCY STOP SIGNAL SYSTEM (ESS)].)

Description

• The sudden deceleration hazard warning mode of the emergency signal system (ESS) does not operate.

― The hazard warning lights do not flash even though the brake pedal is pressed and the vehicle decelerates suddenly^*1 while driving at a vehicle speed of 60 km/h {37 mph} or more.

• The emergency stop hazard warning mode of the emergency signal system (ESS) does not operate.

― Hazard warning lights stop flashing even though the brake pedal is depressed at a vehicle speed of 10 km/h {6.2 mph} or less while the sudden deceleration hazard warning mode operates.

*1 :Deceleration of vehicle speed at 30 km/h {19 mph} or more for 1 s while vehicle speed is 60—70 km/h {38—43 mph} or more.

Possible cause

• BCM malfunction

Driving road surface effect (emergency signal system (ESS) normal)

• Grip level of tires is low

― Driving on a low-traction surface

― Tire wear (hydroplaning)

Diagnostic Procedure

Step

Inspection

Action

1

INSPECT FLASHING HAZARD WARNING LIGHT CIRCUIT FOR MALFUNCTION

•  Turn the hazard warning switch on.

•  Do the hazard warning lights flash?

Yes

Go to the next step.

No

Replace the BCM.

(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)

2

DETERMINE IF MALFUNCTION CAUSED BY ABS OPERATION MALFUNCTION

•  Inspect the ABS operation at 10—20 km/h {6.3—12.0 mph}.

•  Is the ABS operation normal?

Yes

Phenomenon occurring due to effect of road surface can be considered. (Emergency Signal System (ESS) normal)

If the malfunction recurs, replace the BCM.

(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)

No

Inspect the tires for the following:

•  Tire air pressure (are all four tires at recommended pressure?)

•  Tire wear condition (is tire wear uniform on all four tires, or is it different?)

•  Tire size

Adjust the malfunctioning tire or replace the tire.

Step	Inspection		Action
1	INSPECT FLASHING HAZARD WARNING LIGHT CIRCUIT FOR MALFUNCTION • Turn the hazard warning switch on. • Do the hazard warning lights flash?	Yes	Go to the next step.
1		No	Replace the BCM. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)
2	DETERMINE IF MALFUNCTION CAUSED BY ABS OPERATION MALFUNCTION • Inspect the ABS operation at 10—20 km/h {6.3—12.0 mph}. • Is the ABS operation normal?	Yes	Phenomenon occurring due to effect of road surface can be considered. (Emergency Signal System (ESS) normal) If the malfunction recurs, replace the BCM. (See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)
2		No	Inspect the tires for the following: • Tire air pressure (are all four tires at recommended pressure?) • Tire wear condition (is tire wear uniform on all four tires, or is it different?) • Tire size Adjust the malfunctioning tire or replace the tire.