Description

Hazard warning switch error signal received

Detection condition

• BCM receives the error signals from the start stop unit for 2 s or more with the ignition switched ON (engine off or on).

Fail-safe

• Perform the control with hazard warning switch signal turned off.

Possible cause

• Start stop unit malfunction

• Hazard warning switch malfunction

• BCM malfunction

System wiring diagram

Not applicable

Step

Inspection

Action

1

• Clear the DTC for the BCM using the M-MDS.

  (See CLEARING DTC [BCM].)

• Switch the ignition ON (engine off or on) and wait for 2 s or more.

• Retrieve the BCM DTCs using the M-MDS.

  (See DTC INSPECTION [BCM].)

• Is the same DTC displayed?

Yes

Go to the next step.

No

Go to Step 6.

2

• Using the M-MDS, display PID HAZARD_SW for the start stop unit.

  (See PID/DATA MONITOR INSPECTION [START STOP UNIT].)

• Does the PID monitoring value switch correctly according to the hazard warning switch operation?

Yes

Go to Step 4. (Circuit between hazard warning switch and start stop unit is normal)

No

Go to the next step.

3

• Inspect the hazard warning switch.

  (See HAZARD WARNING SWITCH INSPECTION.)

• Is the hazard warning switch normal?

Yes

Replace the start stop unit, then go to Step 5.

(See START STOP UNIT REMOVAL/INSTALLATION.)

No

Replace the hazard warning switch, then go to Step 5.

(See HAZARD WARNING SWITCH REMOVAL/INSTALLATION.)

4

• Using the M-MDS, display PID HAZARD_SW for the BCM.

  (See PID/DATA MONITOR INSPECTION [BCM].)

• Does the PID monitoring value switch correctly according to the hazard warning switch operation?

Yes

Go to the next step. (Circuit between start stop unit and BCM is normal)

No

Replace the start stop unit, then go to the next step.

(See START STOP UNIT REMOVAL/INSTALLATION.)

5

• Clear the DTC for the BCM using the M-MDS.

  (See CLEARING DTC [BCM].)

• Switch the ignition ON (engine off or on) and wait for 2 s or more.

• Retrieve the BCM DTCs using the M-MDS.

  (See DTC INSPECTION [BCM].)

• Is the same DTC displayed?

Yes

Repeat the inspection from Step 1.

• If the malfunction recurs, replace the BCM.

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

Go to the next step.

No

Go to the next step.

6

• Are any other DTCs displayed?

Yes

Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.

(See DTC TABLE [BCM].)

No

DTC troubleshooting completed.