Description

Light switch error signal received

Detection condition

• BCM receives error signals from the start stop unit for 5 s or more with the ignition switched ON (engine off or on).

Fail-safe

Exterior lighting system

• Turn the TNS (parking lights) and headlights LO on, and turn off other exterior light controls.

Possible cause

• Start stop unit malfunction

• Light 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 5 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 5.

2

• Retrieve the start stop unit DTCs using the M-MDS.

  (See DTC INSPECTION [START STOP UNIT].)

• Are any other DTCs displayed?

Yes

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

(See DTC TABLE [START STOP UNIT].)

No

Go to the next step.

3

• Inspect the light switch.

  (See LIGHT SWITCH REMOVAL/INSTALLATION.)

• Is the light switch normal?

Yes

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

(See START STOP UNIT REMOVAL/INSTALLATION.)

No

Replace the light switch, then go to the next step.

(See LIGHT SWITCH REMOVAL/INSTALLATION.)

4

• 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 5 s or more.

• Retrieve the BCM DTCs using the M-MDS.

  (See DTC INSPECTION [BCM].)

• Is the same DTC displayed?

Yes

Replace the BCM, then go to the next step.

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

No

Go to the next step.

5

• 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.